MRI Wrist – Generic Standard Protocol

1. Executive Summary

The wrist is the most anatomically complex joint in the musculoskeletal system. It comprises eight carpal bones, three distinct joint compartments (radiocarpal, midcarpal, and distal radioulnar), a triangular fibrocartilage complex (TFCC) that serves as the primary ulnar-sided stabiliser, ten intrinsic intercarpal ligaments, multiple extrinsic radiocarpal and ulnocarpal ligaments, numerous tendon compartments, and three major peripheral nerves. No other modality provides comparable simultaneous multiplanar soft tissue assessment without ionising radiation.

The generic non-arthrographic wrist MRI protocol described in this page is designed for the broad population of patients presenting with wrist pain of unclear aetiology, suspected TFCC or ligamentous pathology, post-traumatic evaluation with normal or inconclusive radiographs, suspected scaphoid fracture, suspected inflammatory arthropathy, tendon pathology, carpal tunnel syndrome, or bone marrow assessment. It provides a comprehensive non-invasive survey of all major anatomical compartments.

1.1 Core Strengths

TFCC assessment: MRI at 3T achieves sensitivity 86–100% and specificity 100% for TFCC full tears on non-arthrographic imaging, comparable to MR arthrography for complete tears [4, 5]. For peripheral (traumatic) TFCC tears at the ulnar attachment, 3T MRI with dedicated sequences has demonstrated sensitivity 100% in the highest-quality prospective series [3].

Intrinsic ligament assessment: at 3T, non-arthrographic MRI achieves sensitivity 87–89% and specificity 90–100% for scapholunate (SL) ligament tears [3, 5]. Lunotriquetral ligament detection remains more challenging: sensitivity 63–82% even at 3T [3, 6]. MR arthrography is superior for partial ligament tears and for lunotriquetral assessment.

Occult scaphoid fracture: MRI is the definitive investigation for radiographically occult scaphoid fracture, demonstrating marrow oedema within hours of injury with sensitivity approaching 100% for confirmed fractures. This is the clearest indication where MRI changes management acutely.

Bone marrow assessment: avascular necrosis of the lunate (Kienböck disease), scaphoid non-union, and early carpal avascular changes are uniquely demonstrated on MRI before radiographic abnormality develops.

Tendon assessment: all nine extensor tendon compartments and the flexor tendons within the carpal tunnel are assessed on axial MRI sequences. Tendon tears, tenosynovitis, ganglia, and de Quervain's tenosynovitis are well characterised.

Nerve entrapment: the median nerve in the carpal tunnel and the ulnar nerve in Guyon's canal are assessed for calibre, signal change, and extrinsic compression.

Carpal instability: carpal alignment on MRI sequences correlates with static instability patterns (DISI, VISI). Dynamic instability requires fluoroscopy or kinematic MRI, which are beyond the scope of the generic protocol.

1.2 Intrinsic Limitations of the Generic Protocol

The generic non-arthrographic wrist MRI protocol is a diagnostic compromise with several critical limitations.

Partial ligament tear detection is the most clinically important limitation. The SL ligament has three components (dorsal, membranous, volar); the dorsal component is the most mechanically important. Non-arthrographic MRI sensitivity for partial SL tears — the most clinically relevant operative decision point — is substantially lower than for complete tears, and systematically lower than MR arthrography. Published sensitivity for partial SL tears ranges from 19% to 63% on non-arthrographic 1.5T, improving to approximately 63–87% at 3T with dedicated sequences [3, 6, 7]. For patients where surgical decision-making hinges on partial SL ligament tear characterisation, MR arthrography is the appropriate investigation.

Lunotriquetral ligament: this is the most difficult intrinsic ligament to assess even on non-arthrographic 3T MRI. Sensitivity of 63% for LT tears at 3T means that a negative non-arthrographic MRI does not exclude clinically significant LT pathology. MR arthrography is required when LT tear is the primary surgical question.

Articular cartilage: the thin radiocarpal and intercarpal cartilage (1–2 mm) cannot be reliably graded on standard protocol sequences. Dedicated cartilage protocols or MR arthrography with cartilage-specific sequences are required for cartilage assessment.

Dynamic instability: kinematic or load-bearing MRI is required to assess dynamic carpal instability not visible on static studies.

Off-isocentre positioning in standard supine position degrades fat suppression uniformity — the same fundamental problem as the elbow, amplified at the small FOV required for wrist imaging.

When dedicated child protocols are required: direct MR arthrography (three-compartment or single-compartment) for partial SL and LT ligament tears, intra-articular loose bodies, and cartilage assessment; kinematic MRI for dynamic instability; dedicated carpal tunnel protocol; scaphoid protocol with oblique coronal along the scaphoid long axis.

2. Main Clinical Indications

2.1 Standard Indications

TFCC tears and ulnar-sided wrist pain is the most common indication for wrist MRI in clinical practice. The TFCC is the primary ulnar-sided stabiliser, and its injuries range from acute traumatic tears (Palmer class I) to degenerative perforations (Palmer class II). Non-arthrographic 3T MRI is sufficient for detecting complete TFCC tears; MR arthrography is required for partial peripheral tears where surgical repair is contemplated.

Scapholunate ligament assessment is the primary indication when a patient presents with dorsal wrist pain, a positive Watson shift test, or post-traumatic instability concern. Complete SL tears are well detected at 3T non-arthrographic MRI; partial tears require MR arthrography for reliable diagnosis. The generic protocol provides initial assessment; if negative and clinical suspicion remains high, arthrography should follow.

Occult scaphoid fracture after a fall on an outstretched hand with normal or inconclusive radiographs is the clearest acute indication where MRI changes immediate management (anti-coagulation, surgical fixation for proximal pole fractures). The ACR Appropriateness Criteria support MRI as the most appropriate imaging study for suspected scaphoid fracture when radiographs are negative [1, 2]. The generic protocol is entirely sufficient for this indication.

Avascular necrosis of the lunate (Kienböck disease) is diagnosed on MRI before radiographic abnormality, enabling earlier intervention. STIR and T1 sequences show marrow signal change stages I–IV. The generic protocol is sufficient. For sequence-level protocol optimisation, vendor terminology and artefact management, see the dedicated MRIninja page STIR Sequence.

Ganglion and soft tissue masses: the large majority of dorsal and volar wrist ganglia and soft tissue masses are characterised by the generic protocol. Vascular lesions and solid masses suspected of malignancy may require additional dedicated post-contrast sequences.

Inflammatory arthropathy: rheumatoid arthritis affecting the wrist — the most commonly involved joint in RA — produces synovitis, erosions, tendon synovitis, and TFCC degeneration. The generic protocol assesses all of these; post-contrast T1-FS is required for synovitis quantification.

Tendinopathy and tenosynovitis: de Quervain's tenosynovitis (first extensor compartment), intersection syndrome (second and third compartment confluence), ECU tenosynovitis, and flexor tenosynovitis are well assessed on the generic protocol without contrast.

Carpal tunnel syndrome: MRI is not the primary diagnostic tool for carpal tunnel syndrome (which is diagnosed clinically and by nerve conduction studies), but may be requested to characterise the cause of compression (ganglion, lipoma, anomalous muscle, bone fragment) or to assess the nerve before surgery.

De novo wrist pain without clear diagnosis: the generic protocol provides a comprehensive survey that identifies or excludes the major structural pathologies. For non-specific pain where clinical localisation is uncertain, the generic protocol is the appropriate starting investigation.

2.2 Urgent Red Flags Requiring Expedited or Emergency Imaging

The wrist does not generate life-threatening emergencies. Expedited imaging is required in the following scenarios.

3. Preparation Reference

Universal MRI safety screening, contraindication assessment, and IV access documentation are covered in the general MRI preparation page and are not repeated here.

3.1 Anatomy-Specific Preparation Items

The wrist off-isocentre problem: identical in principle to the elbow, but more severe in practice because the wrist requires an even smaller FOV (8–12 cm) to achieve the spatial resolution needed for 1–2 mm ligament fibres and the TFCC disc. Off-isocentre B0 inhomogeneity at the wrist, combined with a small FOV, produces particularly severe fat suppression failure if spectral methods are used without optimisation. Dixon or STIR are the appropriate solutions.

Wrist position — neutral deviation is mandatory: the wrist must be imaged in neutral ulnar-radial deviation. Any radial or ulnar deviation changes the alignment of the carpal rows, alters the apparent width of the intercarpal spaces, and modifies the Gilula arc geometry that is used to assess carpal alignment. Even a few degrees of radial deviation can create the appearance of DISI-like malalignment in a normal wrist, or obscure true malalignment. The wrist must rest flat on the imaging surface in the neutral position.

Pronation vs. supination: the standard position for non-arthrographic wrist MRI is pronation (palm down) in the Superman position, or supination (palm up) in the supine arm-at-side position. The choice of pronation vs. supination affects the position of the ECU tendon relative to the TFCC: in pronation, the ECU subsheath is under tension and the ECU sits in its groove; in supination, the ECU may sublux dorsally. For standard diagnostic MRI, either position is acceptable provided it is documented and reproducible on serial studies.

Jewellery, watches, and wrist devices: all metallic items from the wrist and hand must be removed. Compression bandaging, splints, and wound dressings over the wrist must be removed before imaging.

Prior surgery or metallic hardware: document any history of scaphoid fixation (Herbert screw, K-wires), distal radius plate, carpal arthroplasty, or Kirsner wire. These produce susceptibility artefact that may compromise assessment of adjacent structures.

Dominant vs. non-dominant hand: when protocol modification is required for the contralateral hand as comparison, document laterality explicitly.

Claustrophobia and small-bore scanner position: the wrist examination — particularly in the Superman position — requires the patient's arm to be extended overhead with the scanner bore around both the arm and thorax. Claustrophobic patients may tolerate the supine arm-at-side position better, even at the cost of reduced image quality.

3.2 Patient Positioning on the MRI System

Two primary positioning options exist, with the same considerations as the elbow but amplified for the smaller structures:

Option 1 — Supine, arm at side: the patient lies supine, feet first, with the affected arm extended along the side, wrist in neutral deviation, palm facing down (pronation) or up (supination). More comfortable; achieves higher patient compliance and less motion. The wrist is positioned 20–30 cm from isocentre. Dixon fat suppression is mandatory in this position for reliable fat-suppression quality.

Option 2 — Prone, arm extended overhead (Superman position): the patient lies prone, head first, with the affected arm extended overhead, wrist near isocentre. This is the preferred position for image quality — optimal B0 homogeneity, SNR, and fat suppression uniformity. However, this position is uncomfortable: significant motion artefact from patient discomfort may negate the technical advantages. The practical recommendation for clinical departments is to attempt the Superman position and fall back to the supine position if the patient cannot tolerate it, using Dixon fat suppression for the latter.

Coil selection: a dedicated small phased-array wrist coil (circumferential or surface) is mandatory for diagnostic wrist MRI. The coil FOV must be matched to the wrist size — typically 8–12 cm. A general-purpose flex coil, knee coil, or body coil cannot achieve the resolution required for TFCC and intercarpal ligament assessment. Multi-channel wrist coils (8-channel minimum) are preferred at 3T to enable parallel imaging without SNR penalty at small FOV.

Centering: isocentre at the centre of the carpal bones, at the level of the proximal carpal row (lunate, scaphoid, triquetrum). The laser localiser should align to the radial styloid level on the lateral aspect of the wrist.

Immobilisation: foam padding around the wrist in the coil prevents micro-motion during the examination. Specific attention to preventing ulnar or radial drift of the wrist during the examination — even small amounts of ulnar deviation change the carpal alignment on serial coronal images.

Common positioning errors:

• Wrist in ulnar or radial deviation: Gilula arc analysis unreliable; carpal malalignment assessment falsified
• Wrist in pronation when comparing with prior supination study (or vice versa): ECU position and TFCC anatomy differ; serial comparison compromised
• Coil too proximal: the distal radioulnar joint (DRUJ) is excluded from coverage
• Coil too distal: the radial and ulnar styloids are excluded; TFCC ulnar attachment assessment compromised
• Fingers extended inside the coil without immobilisation: finger motion propagates into wrist images

4. Standard Protocol Design

The standard wrist MRI protocol is built around three orthogonal planes — coronal, sagittal, and axial — with PD-FS and T1-weighted TSE. For the wrist, the coronal plane is the primary diagnostic plane — the TFCC, the SL ligament, and the intercarpal ligaments are all displayed in their longitudinal cross-section on the coronal. For sequence-level protocol optimisation, vendor terminology and artefact management, see the dedicated MRIninja page Turbo Spin Echo (TSE/FSE) Sequence.

4.1 Mandatory Core Sequences

4.2 Conditional Sequences

4.3 Rationale Summary Per Sequence

Coronal PD-FS is the primary diagnostic sequence for wrist MRI — the single most important acquisition in the entire protocol. The coronal plane displays in a single acquisition:

• The TFCC in its full extent from the radial sigmoid notch to the ulnar fovea and styloid
• The scapholunate ligament as a C-shaped structure bridging the proximal scaphoid and lunate
• The lunotriquetral ligament bridging the lunate and triquetrum
• The intercarpal ligaments at the midcarpal level
• The articular surfaces of the distal radius, ulna, and carpal rows
• The Gilula arcs (three smooth carpal arcs that define normal intercarpal alignment)
• The DRUJ articular space and cartilage
• Bone marrow of all eight carpal bones and the distal radius

Fat suppression is mandatory: the intraosseous fat of the carpal bones and the periligamentous fat between the carpus and TFCC would overwhelm the signal from these 1–2 mm structures. PD weighting (TE 20–40 ms) at the wrist does not carry significant magic angle problems because the TFCC fibres and intercarpal ligaments do not run at a consistent 55° to B0 in the coronal plane.

Coronal T1 without fat suppression complements the PD-FS by providing: (i) T1 signal characterisation — distinguishing haemorrhage, lipid, and proteinaceous content from fluid; (ii) bone cortex detail and trabecular architecture; (iii) the basis for Kienböck staging (T1 signal change in the lunate is the primary Kienböck sign); (iv) fibrous tissue characterisation (e.g., sclerotic non-union margins). Kienböck disease is diagnosed primarily on T1: T1 signal loss throughout the lunate (Stage II onwards) is the defining MRI finding.

Axial PD-FS is the primary plane for:

• The carpal tunnel contents: median nerve (calibre, signal, flattening ratio), flexor tendons, and surrounding tenosynovium
• All nine extensor tendon compartments on successive axial slices
• The ulnar nerve in Guyon's canal
• Ganglion cysts (dorsal and volar, with connection to joint if present)
• ECU tendon in its subsheath — axial is the optimal plane for ECU subsheath integrity
• Synovial proliferation within the tendon sheaths

Sagittal PD-FS provides:

• Longitudinal tendon assessment — flexor tendons and extensor tendons in their long axis
• Volar and dorsal extrinsic ligaments (radiocarpal: radioscapholunate, radiolunotriquetral; ulnocarpal: ulnolunate, ulnotriquetral) — these are seen in sagittal oblique sections perpendicular to the ligament bundles
• Carpal tunnel canal anatomy
• Lunate morphology and DISI/VISI tilt assessment: on sagittal images, the lunate tilt angle (normally < 15° dorsal or < 15° volar) can be estimated, contributing to carpal instability assessment
• Scaphoid in profile: waist fractures are often visible on sagittal sequences even when not seen coronally

STIR provides B0-independent marrow and soft tissue oedema screening — mandatory for scaphoid fracture detection (the primary acute indication) and Kienböck staging. STIR contrast cannot be replicated by fat-suppressed PD when the wrist is positioned off-isocentre with imperfect spectral saturation.

4.4 Sequence Matching and Cross-Sequence Consistency

The three orthogonal planes must be prescribed to be genuinely orthogonal to the wrist axes — not to the body axes. The coronal plane must be parallel to the palmar surface of the wrist (the true coronal of the joint), the axial must be perpendicular to the long axis of the radius, and the sagittal must be perpendicular to the coronal.

When post-contrast sequences are acquired, pre- and post-contrast T1-FS must use identical prescription for meaningful comparison. In wrist MRI, pre-contrast T1 non-FS coronal and post-contrast T1-FS coronal are the paired sequences most frequently used for synovitis assessment.

For serial studies — particularly Kienböck staging, ganglion follow-up, or inflammatory arthropathy monitoring — the coronal prescription must be documented and reproducible: same wrist position (pronation vs. supination), same ulnar-radial deviation (neutral), same coronal prescription angle.

4.5 Fat Suppression — Region-Specific Technical Considerations

Fat suppression at the wrist faces the same off-isocentre B0 inhomogeneity challenge as the elbow, but at a more severe degree because: (i) the wrist is positioned farther from isocentre than the elbow in the supine position in most scanner geometries; (ii) the required FOV is smaller (8–12 cm), amplifying the effect of any local field perturbation; (iii) the structures of interest (TFCC disc: 1–2 mm; SL ligament dorsal band: 1–2 mm) are smaller than the fat suppression failure zone, making regional failure more diagnostically destructive.

Dixon fat suppression is the preferred technique for wrist MRI because its multi-echo B0-independent acquisition is not affected by off-isocentre positioning. It provides consistent fat suppression in the coronal plane critical for TFCC and ligament assessment, regardless of whether the Superman or supine arm-at-side position is used. Modern Dixon implementations at 3T achieve 0.2–0.3 mm in-plane resolution within clinical acquisition times for dedicated wrist coils.

SPAIR is an acceptable alternative when Dixon is unavailable. It performs better than CHESS at off-isocentre positions and is appropriate when the patient can tolerate the Superman position with near-isocentre wrist placement.

CHESS/ChemSat: standard spectral fat saturation is inadequate for off-isocentre wrist MRI and should not be used as the sole fat suppression technique for the primary PD-FS sequences. It is acceptable for minor adjunctive sequences where fat suppression quality is secondary.

STIR: B0-independent, mandatory for bone marrow screening. At the wrist, STIR is particularly important for scaphoid fracture and Kienböck assessment. STIR has lower SNR than PD-FS — the resolution target must be adjusted accordingly (see Section 10).

STIR contraindicated post-gadolinium — absolute rule as in all MRIninja protocols.

5. Optimisation Strategy

5.1 Artifact Reduction by Source

Off-isocentre B0 inhomogeneity and fat suppression failure: the most important wrist-specific artefact problem. The combination of small FOV and off-isocentre positioning produces spectral fat saturation failure that is characteristically asymmetric: one side of the carpus appears well suppressed while the other shows residual fat signal. This asymmetric signal increase at the radial or ulnar edge of the carpus can simulate periligamentous oedema or simulate TFCC signal change. Dixon fat suppression eliminates this problem entirely.

Radial artery pulsation artefact: the radial artery courses along the radial aspect of the wrist before entering the anatomical snuffbox. Its pulsation produces A-P phase-direction ghost bands on coronal sequences that cross the scaphoid and the radial styloid in the A-P direction. A radial presaturation band placed over the radial artery effectively suppresses this artefact.

Motion artefact: the primary cause of non-diagnostic wrist MRI. The wrist is a small structure requiring high spatial resolution and long acquisition times. Minor involuntary motion — particularly finger twitching propagated to the wrist — degrades image quality disproportionately because the slice thickness (2–3 mm) and in-plane resolution (0.2–0.4 mm) mean that even sub-millimetre displacement between acquisitions produces visible blurring. PROPELLER/BLADE-type acquisitions (motion-insensitive k-space acquisition) can improve coronal PD-FS quality in patients with minor motion but at the cost of increased acquisition time.

Chemical shift artefact: at bone-fat interfaces in the carpal bones, chemical shift produces the characteristic signal line and void. This is most visible at the scaphoid-trapezoid interface, the lunate fovea, and the radial articular surface. At 3T with 400 Hz/px bandwidth, the displacement is reduced to approximately 0.4 mm — below the slice thickness — and is generally not a diagnostic problem for standard wrist sequences. At 1.5T with narrower bandwidth, the displacement may reach 1–2 mm and can simulate periosseous changes.

Magic angle artefact at the TFCC: the TFCC disc fibres run at approximately 55° to B0 at certain locations in the coronal plane of the standard wrist position, producing apparent T1 and PD signal increase that can simulate a central perforation or partial tear. The diagnostic solution is the same as for all magic angle: corroborate apparent TFCC signal on PD-FS with a T2-weighted sequence (TE > 60 ms) — true tears show signal on T2-weighted images; magic angle artefact disappears.

Magic angle at the extensor tendons: similar to the shoulder and elbow, the extensor tendons crossing the wrist are oriented at various angles relative to B0 on the coronal sequences. Extensor tendon signal on coronal PD-FS must be correlated with axial sequences and the T1 coronal before interpreting tendinopathy.

Susceptibility artefact from metallic hardware: K-wires, Herbert screws, and plate fixation produce signal voids that can obscure the scaphoid non-union assessment region or the TFCC. MARS strategies (wider bandwidth, STIR, reduced TE, shortened readout) mitigate but do not eliminate this. The key practical issue is whether the target anatomy is within the artefact zone — if it is, the study may be non-diagnostic for that specific question despite the rest of the examination being interpretable.

5.2 Protocol Efficiency and Throughput

A full diagnostic wrist MRI protocol at 3T can be completed in 25–35 minutes. At 1.5T, 35–50 minutes.

Short protocol (approximately 15 minutes): Coronal PD-FS + Coronal T1 + Axial PD-FS provides the minimum clinically interpretable wrist MRI for TFCC, SL ligament, and bone marrow assessment.

3D isotropic sequences: at 3T, a single 3D isotropic PD-FS or DESS acquisition in the coronal orientation (8–12 minute acquisition) provides all three planes from a single sequence. This is the most efficient approach for TFCC and ligament assessment. The DESS (Dual Echo Steady State) sequence at 3T has been specifically validated for wrist ligament and TFCC assessment with sensitivity 87% for SL tears and 100% for TFCC tears [3]. 3D TSE isotropic sequences (SPACE/VISTA/CUBE) provide superior T2* contrast for ligament fibre definition compared to older 3D GRE approaches.

2D sequences are preferred for bone marrow assessment (STIR, T1) where slice-specific signal must be reliably interpreted without partial-volume averaging from isotropic reformats.

5.3 Field Strength Considerations

3T advantages: the wrist is the joint where field strength difference is most diagnostically consequential. Published data consistently demonstrate that 3T outperforms 1.5T for SL ligament tears, LT ligament tears, and TFCC partial tears. At 1.5T, sensitivity for SL tears in a meta-analysis was approximately 70% and for LT tears approximately 31% [2]. At 3T with optimised protocols, sensitivity increases to 87–89% for SL and 63–82% for LT [3, 5]. The 3T advantage reflects the SNR gain that enables smaller voxels — and at the wrist, where the diagnostic structures are 1–2 mm thick, this voxel size improvement directly translates to diagnostic accuracy.

3T with dedicated coil is the minimum recommended configuration for diagnostic wrist MRI for ligament and TFCC assessment. Low-field or 1.5T with a general-purpose coil is inadequate for reliable TFCC and ligament assessment.

1.5T is acceptable for: scaphoid fracture screening, Kienböck staging (marrow signal change), bone marrow survey, large tendon tears (complete bicipital tuberosity insertion), and soft tissue mass characterisation. For TFCC and intrinsic ligament assessment, 1.5T is a diagnostic compromise with substantially lower sensitivity.

SAR at 3T: standard TSE sequences at 3T are within SAR limits for the wrist. No SAR limitation issues specific to the wrist.

6. Contrast Use Principles Specific to Wrist MRI

6.1 Non-Contrast Standard Protocol — Sufficient For

• Occult scaphoid fracture screening (the primary acute indication)
• Kienböck disease staging
• TFCC complete tear detection at 3T
• SL ligament complete tear detection at 3T
• Tendinopathy and tenosynovitis (most cases)
• Ganglion and soft tissue mass characterisation (most cases)
• Bone marrow survey (inflammatory, neoplastic, traumatic)
• Carpal tunnel assessment for extrinsic compression
• Pre-operative scaphoid non-union assessment

6.2 Gadolinium Indicated — Region-Specific Contexts

Direct MR arthrography (separate child protocol) is indicated for:

• Partial SL ligament tear where surgical decision-making requires definitive diagnosis
• Lunotriquetral ligament assessment when non-arthrographic 3T is negative but clinical suspicion is high
• Osteochondral lesion stability assessment
• Intra-articular loose body assessment

Intravenous GBCA post-contrast T1-FS is indicated for:

• Inflammatory synovitis quantification (RA, spondyloarthropathy, PVNS)
• Suspected septic arthritis (joint effusion character, synovial enhancement)
• Soft tissue or bone tumour staging
• Nerve enhancement (neuritis, compressive neuropathy refractory to conservative management)
• Post-operative assessment for wound infection or hardware-related complications

6.3 Post-Contrast Acquisition Timing

For inflammatory synovitis, 3–5 minutes post-injection provides optimal synovium-to-fluid contrast. STIR contraindicated post-gadolinium — absolute rule.

7. Reporting Essentials

7.1 Interpretation Framework

The wrist MRI report should systematically assess four structural domains: the intrinsic ligaments and TFCC (the primary diagnostic targets in most wrist MRI), the carpal bones and bone marrow (Kienböck, scaphoid, avascular changes), the tendon compartments and carpal tunnel, and the articular surfaces and joint spaces.

Clinical context is critical for the wrist: the Gilula arc assessment and carpal alignment measurement must be performed with specific awareness of the wrist position at the time of imaging. A neutral-position study showing DISI malalignment is a definitive finding; a study performed in slight radial deviation showing apparent DISI-like tilt must be correlated with the positioning documentation before a diagnostic conclusion is reached.

For ligament and TFCC findings, the report must specify: complete vs. partial tear; specific component torn (for SL: dorsal/membranous/volar; for TFCC: central disc vs. peripheral/foveal); and whether the finding is acute (traumatic) or degenerate (Palmer classification context).

7.2 Mandatory Reporting Checklist

Intrinsic ligaments:

• SL ligament: intact / signal change / partial tear (specify component) / complete tear; SL interval width if measurable
• LT ligament: intact / signal change / partial tear / complete tear
• Other midcarpal interosseous ligaments: overall assessment

TFCC:

• Articular disc: intact / central perforation / complete tear
• TFCC peripheral attachment (fovea and ulnar styloid): intact / partial / complete tear; foveal avulsion
• Dorsal and volar radioulnar ligaments: intact / tear
• ECU subsheath: intact / disrupted

Carpal bones:

• Scaphoid: cortex, marrow signal, waist abnormality, proximal pole signal
• Lunate: T1 signal (Kienböck staging), cortex integrity, size
• All carpal bones: marrow signal, cortex

Gilula arcs and carpal alignment:

• Arc I (proximal carpal row): smooth / interrupted
• Arc II (proximal margins of midcarpal row): smooth / interrupted
• Arc III (distal margins of midcarpal row): smooth / interrupted
• Scapholunate angle (normal 30–60°): value if measurable
• Lunate tilt (DISI/VISI) if present

DRUJ:

• Articular cartilage: intact / chondral change
• DRUJ stability: not assessable on static MRI — note limitation

Tendon compartments:

• First compartment (APL/EPB): de Quervain's tenosynovitis?
• Second-sixth compartments: tenosynovitis, tear, subluxation
• Flexor tendons: tendinopathy, tenosynovitis, tear
• Carpal tunnel: median nerve calibre and signal; tunnel content

Articular surfaces: cartilage, subchondral changes, erosions

Soft tissues: ganglia (location, size, connection to joint), masses

7.3 Structured Reporting

Reports: Indication (clinical question); Technique (field strength, position, pronation/supination, sequences, contrast); Comparison (prior studies, prior radiographs); Findings (domain-by-domain per checklist); Impression (clinically relevant summary); Limitations (fat suppression quality, hardware, positioning); Critical communication if required.

7.4 Incidental Findings — Clinical Decision Framework

Usually benign: small scaphoid cysts (subchondral cysts at the scaphoid waist — very common, usually degenerative); mild TFCC central perforation in patients over 50 years (Palmer class IIA degeneration is virtually universal with age); small dorsal ganglion; moderate joint effusion without synovitis in elderly patients.

May require clinical correlation: scaphoid cortical irregularity or bone marrow oedema in an asymptomatic wrist — even if the request was for the other side; DRUJ articular cartilage loss (ulnar variance mismatch — should be documented for potential management implications).

Require explicit communication: lunate T1 signal loss (Kienböck) even if the indication was something else (changes management immediately); acute cortical fracture at the scaphoid waist not mentioned in the clinical indication; aggressive bone lesion features; SL widening and DISI alignment indicating complete SL disruption (changes surgical planning urgency).

8. MRI Technologist Pearls

8.1 Sequence Order Logic

Recommended sequence order for standard non-contrast wrist MRI:

1. Three-plane localiser
2. Coronal PD-FS ← most diagnostically critical; acquire first
3. Coronal T1 ← same prescription; fast acquisition immediately after
4. STIR coronal ← bone marrow screening; critical for scaphoid
5. Axial PD-FS
6. Sagittal PD-FS

Rationale: coronal PD-FS and T1 are the primary sequences. Acquiring them first ensures optimal quality before patient fatigue and motion increase. STIR is third — it has long TR and is more vulnerable to motion but is critical for scaphoid and Kienböck assessment.

For contrast examinations: STIR before injection; axial T1 non-FS before injection; post-contrast T1-FS at 3–5 minutes post-injection.

8.2 Positioning Tricks

• Always verify wrist neutral deviation before scanning using the localiser: styloid tips should be equidistant from the scanner axis on the coronal localiser. If asymmetric, ask the patient to reposition.
• For the Superman position: pad the shoulder, provide forearm support along the entire length, and pad the wrist coil against movement. Keep scan blocks under 8 minutes and check with the patient between acquisitions.
• For patients who cannot tolerate Superman: use supine arm-at-side with Dixon fat suppression. The difference in image quality with modern Dixon implementation at 3T is clinically acceptable for most indications.
• For patients with a cast: plaster casts are generally MRI-compatible but may contain radiopaque filler that causes minor susceptibility. Fibreglass casts are preferred and are compatible. Always scan through the minimum amount of cast material.
• For bilateral wrist comparison (RA, AVN): bilateral sequential scanning requires repositioning and replanning. Allow 3–5 minutes between sides.

8.3 Fast Salvage Protocol

Three sequences in approximately 10 minutes provide the minimum clinically interpretable wrist MRI.

8.4 Common Avoidable Errors

9. Quality Control Checklist

• Wrist neutral deviation: styloid tips equidistant from scanner axis on localiser
• Coronal slices parallel to palmar surface of radius (axial scout verification)
• TFCC ulnar attachment (ulnar styloid tip and fovea) included in coronal coverage
• Radial styloid tip included in coronal coverage
• Carpal tunnel from DRUJ to hamate hook level included in axial coverage
• Distal carpal row included in distal extent of coronal
• Radial presaturation band applied on coronal sequences
• Fat suppression uniform across full FOV on PD-FS (no medial/lateral asymmetric failure)
• STIR acquired before gadolinium (if contrast used)
• Post-contrast sequences acquired ≥ 3 minutes after injection (if contrast used)
• No significant motion artefact on coronal PD-FS
• Metal artefact noted and MARS applied if hardware present
• Correct laterality documented in sequence labels
• Wrist position (pronation/supination) documented
• All five mandatory sequences completed

11. Evidence Gaps and Ongoing Debate

Non-arthrographic 3T vs. MR arthrography for partial SL tears: the clinical question of whether 3T non-arthrographic MRI with isotropic 3D sequences has sufficiently closed the sensitivity gap with MR arthrography for partial SL ligament tears remains unresolved. The available data show significant improvement in sensitivity from 19–50% on 1.5T to 63–87% at 3T with optimised sequences, but no large prospective multicentre trial has definitively compared these modalities for the specific clinical decision of surgical repair planning.

Optimal 3D sequence type at the wrist: whether DESS, SPACE, CUBE, or VISTA provides the best diagnostic accuracy for wrist ligament and TFCC assessment at 3T has not been resolved in a head-to-head multicentre prospective study. Individual institutional series favour different approaches.

Superman vs. supine arm-at-side at 3T with Dixon: the assumption that Superman positioning provides clinically meaningful diagnostic advantage over optimised supine arm-at-side positioning with modern Dixon fat suppression at 3T has not been prospectively validated.

AI reconstruction for wrist MRI: deep learning-accelerated 3D wrist MRI has shown preliminary results maintaining diagnostic accuracy for ligament assessment at 2- to 4-fold acceleration, but prospective validation across vendors and clinical populations is lacking.

Dynamic and kinematic carpal instability MRI: standardised protocols and reporting thresholds for load-bearing or kinematic MRI of the wrist remain unsettled. Dynamic instability assessment is not covered by the generic protocol and requires dedicated child protocols not yet uniformly defined.

LT ligament assessment: the lunotriquetral ligament remains the most difficult intrinsic wrist ligament to assess by any non-arthrographic modality. Whether any further technical advance in 3D isotropic MRI will achieve clinically acceptable sensitivity for LT partial tears without arthrographic distension is an open question.

12. Evidence-Based References

A. Guidelines / Consensus / Society Recommendations

B. Systematic Reviews / Meta-analyses

C. Important Prospective / Original Studies

D. Technical MRI Papers

E. Landmark Historical References

End of document — MRI Wrist Generic Standard Protocol — MRIninja v1.0 — May 2026 This master page is the reference for all future wrist MRI child pages including: MR arthrography, TFCC specific protocols, scapholunate instability, scaphoid fracture, Kienböck disease, carpal tunnel syndrome, de Quervain's tenosynovitis, and post-operative wrist.