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Reading a Wrist MRI Series Plane by Plane

A wrist protocol is really several short series stitched together, each aimed at a different structure. Thin coronal proton-density and gradient-echo slices, often just two millimetres apart, cut across the triangular fibrocartilage complex on the ulnar side and lay the scapholunate and lunotriquetral ligaments open in profile — this is where a radiologist looks for a central TFCC perforation or a widened scapholunate gap. Axial slices run through the carpal tunnel, showing the median nerve sitting among the flexor tendons and letting a reader flag nerve swelling or tenosynovitis. Sagittal slices track carpal alignment along the capitate-lunate-radius line and give a clean side profile of the scaphoid waist, the classic site for an occult fracture that never showed up on plain film.

Fat-saturated sequences suppress the bright marrow fat so any oedema or early avascular necrosis of the lunate lights up against a dark background — this is the series that catches Kienböck disease before collapse. When contrast is injected directly into a joint compartment for a wrist arthrogram, the radiocarpal, midcarpal, and distal radioulnar spaces each get their own contrast-filled series, and dye crossing from one compartment into another is itself the finding: a communicating tear of the TFCC or the interosseous ligaments.

Wrist Conditions on MRI

Ulnar Variance and the Distal Radioulnar Joint

Ulnar variance — how far the ulnar head sits relative to the radius at the wrist — is a measurement a report often states in millimetres, and it matters because a long ulna loads the TFCC and can drive ulnocarpal impaction, while a short ulna shifts stress onto the radiocarpal joint instead. Measure it on a neutral-rotation coronal slice by drawing a line across the distal radius articular surface and comparing it to the ulnar head, the same reference points a hand surgeon uses when deciding whether a shortening or lengthening procedure is worth discussing. The distal radioulnar joint itself is best judged on axial slices near the sigmoid notch, where subluxation or a torn TFCC foveal attachment can let the ulna and radius drift out of their normal side-by-side relationship.

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Finding the Structures Your Report Names

A wrist report reads like a short tour of the carpus, and the viewer lets you follow along slice by slice instead of taking the wording on faith. Find the TFCC by loading the coronal series and scrolling to the ulnar edge of the carpus, just distal to the ulnar head — a healthy complex looks like a smooth dark triangle, while a tear shows a bright linear gap on fluid-sensitive images. The scapholunate ligament sits one or two slices further radial, bridging the scaphoid and lunate; measure the gap between the two bones on that slice if the report calls out instability. For carpal tunnel findings, switch to the axial stack at the level of the pisiform and hook of hamate, where the median nerve sits just deep to the flexor retinaculum among the flexor tendons.

The scaphoid itself is easiest to judge on the sagittal series, where its long axis runs roughly parallel to the slice plane and a fracture line or sclerotic nonunion shows up as a dark band across the waist. Lunate marrow changes belong to the fat-saturated coronal or axial sequences, where bright signal against a suppressed background flags oedema, and a mottled or collapsed lunate outline on the same series points toward established avascular necrosis. If the study is an arthrogram, open the radiocarpal series first, since that is where contrast is injected, then compare it against the midcarpal series to see whether dye has crossed the scapholunate or lunotriquetral interval — a difference between the two stacks is the finding itself, not an artefact.

Why Wrist Detail Rarely Turns Into a 3D Model

Wrist protocols chase sub-millimetre in-plane resolution to resolve ligaments that are only a millimetre or two thick, which is exactly why the coronal stack stays thin — a handful of two-millimetre slices delivers gorgeous ligament and cartilage detail within each slice but leaves too little depth along the scan axis to volume render into a smooth carpal model. The scaphoid, lunate, and triquetrum will look sharp on every coronal image; a rotating 3D reconstruction of the whole carpus is usually a separate, thicker acquisition, if it exists on the study at all.

AI Support Versus a Hand Surgeon's Reading

AI support can translate report shorthand and point out where a described finding sits on the rendered images, but it is not a substitute for a hand surgeon or musculoskeletal radiologist reading the original DICOM data. Lean on it to prepare sharper questions when a report mentions a TFCC tear, scapholunate instability, a scaphoid fracture line, or lunate avascular necrosis, then bring those questions to the clinician who ordered the scan.

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