Zur Differentialdiagnose des N.-interosseus-anterior-Syndroms

Abstract

The differential diagnosis of the rupture of flexor pollicis longus tendon and profundus tendon to index finger to the interosseus anterior nerve syndrome can be difficult and can lead to misinterpretation of the clinical impression. Two cases are reported to demonstrate this problem. In the first case a spontaneous rupture of flexor pollicis longus was found, when first an interosseus anterior nerve syndrome was suspected. In a second case surgical exploration of flexor pollicis longus tendon and profundus tendon to index finger was done on the assumption of a rupture, that revealed intact tendons. In a second operation neurolysis of the interosseus anterior nerve was carried out with full recovery of flexion of the thumb and index finger.

Anterior interosseous nerve palsy following the use of elbow crutches

“…As a result of these factors, AIN palsy can often mimic single tendon lesions, leading to difficulties with diagnosis. In the literature, there are cases of AIN entrapment with unnecessary surgical exploration of FPL tendon[56]. The classical symptom is an inability to form an ‘O’ with the thumb and index finger, and the loss of ability to perform fine tasks despite an intact sensory innervation.…”