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The Journal of Bone and Joint Surgery 82:1354 (2000)
© 2000 The Journal of Bone and Joint Surgery, Inc.

The Orthopaedic Forum

Passive Flexion Sign: A Simple Tool for Diagnosis of Anterior Interosseous Nerve Injury in Children*

S. Terry Canale, M.D. , James H. Beaty, M.D., William C. Warner, Jr. , M.D. and R. Scott Sharp, M.D

*No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. No funds were received in support of this study.
Campbell Foundation 910 Madison Avenue, Suite 500 Memphis, Tennessee 38103

Neurovascular injury is a potential complication of fractures of the forearm or elbow in both adults and children1-5. The prevalence of nerve injury after supracondylar humeral fractures is reported to range from 6 to 16 percent1,2,5. Evaluation of nerve injuries in a number of series will probably show that the anterior interosseous nerve is the most frequently injured2. The standard test of anterior interosseous nerve function is to ask the patient to put the thumb and index finger together to form a circle. If the anterior interosseous nerve is damaged, the flexor pollicis longus and flexor digitorum profundus cannot flex the interphalangeal joint of the thumb and the distal interphalangeal joint of the index finger4. However, this sign is not so straightforward in a young child, who might . . . [Full Text of this Article]


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