Three cases were observed with the same substantial clinical features: flexion contracture of the third, fourth, and fifth finger and less extensive of the wrist. The contracture appeared after a mechanical injury not related to the involved muscles. In two cases the lesion was situated above or in the elbow region, in the third on the ulnar border of the forearm. In all cases there were some ulnar nerve signs and symptoms but the contracture involved flexor muscles which were co-innervated by the median nerve. The signs and symptoms improved or disappeared entirely after neurolysis. The question is raised, whether the contracture is due to peripheral nerves damage.