Abstract
The loss of extensor pollicis longus (EPL) muscle function can be tested clinically in isolation using thumb retropulsion and thumb tenodesis tests. But the assessment of EPL can be challenging in cases where EPL is intact but dysfunctional due to overly elongated tendon like in severe shortening maluninion of distal radius fracture. We describe a clinical test that is based on the exclusive appreciation of the anatomy of EPL and its unique hyperextension capability at the interphalangeal joint of the thumb. The described test is useful in advanced assessment of the integrity of EPL, and in reverse for that of flexor pollicis longus too.
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