Imaging Studies
- Plain radiographs can reveal only gross radiocarpal changes. An axial projection of the carpal tunnel is not easy to obtain because of wrist stiffness.
- Linear tomography does not show sufficient detail. Mannerfelt used circular tomography with an angle of 42°. The tomographic plane was perpendicular to the long axis of the forearm, and an axial projection of the carpal tunnel was obtained. This method revealed the carpal tunnel floor and the opposing aspects of the hamate hook and trapezium.
- MRI can accurately depict the level of rupture and the gap between the tendon ends. MRI also reveals the appearance of the adjacent tendons. MRI may thus assist the surgeon in choosing suture, graft, or tendon transfer.[22]
Other Tests
- To differentiate incomplete anterior interosseous nerve paralysis and rupture of the flexor pollicis longus tendon, dorsiflex the patient's wrist and hyperextend the thumb at both the carpometacarpal and metacarpophalangeal joints.[20]
- If the flexor pollicis longus is intact but paralyzed, the interphalangeal joint flexes spontaneously and resists passive extension when tested.
- If the tendon is ruptured, the interphalangeal joint remains extended.
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