|
Froment's sign is a special test of the wrist. It tests for palsy of the ulnar nerve, specifically, the action of adductor pollicis. Froment sign can also refer to cogwheel effect seen in essential tremor. ==Process of examination== To perform the test, a patient is asked to hold an object, usually a flat object such as a piece of paper, between their thumb and index finger (pinch grip). The examiner then attempts to pull the object out of the subject's hands.〔Jeff G. Konin ''et al''. ''Special Tests for Orthopedic Examination: Third Edition.'' Thorofare, NJ. SLACK Incorporated, 2006.〕 * A normal individual will be able to maintain a hold on the object without difficulty. * However, with ulnar nerve palsy, the patient will experience difficulty maintaining a hold and will compensate by flexing the FPL (flexor pollicis longus) of the thumb to maintain grip pressure causing a pinching effect.〔Richardson, Craig and Fabre, Gerd. '"Froment's Sign." ''Journal of Audiovisual Media in Medicine.'' Vol. 26, No. 1 (2003):34.〕 *Clinically, this compensation manifests as flexion of the IP joint of the thumb (rather than adduction, as would occur with correct use of the adductor pollicis). *The compensation of the affected hand results in a weak pinch grip with the tips of the thumb and index finger, therefore, with the thumb in obvious flexion.〔Richardson, Craig and Fabre, Gerd. '"Froment's Sign." ''Journal of Audiovisual Media in Medicine.'' Vol. 26, No. 1 (2003):34.〕 *Note that the FPL is normally innervated by the anterior interosseous branch of the median nerve. *Anterior interosseous branch comes off more proximally than the wrist, in evaluating lacerations near the wrist. *Simultaneous hyperextension of the thumb MCP joint is indicative of ulnar nerve compromise. This is also known as Jeanne's Sign.〔Jeff G. Konin ''et al''. ''Special Tests for Orthopedic Examination: Third Edition.'' Thorofare, NJ. SLACK Incorporated, 2006.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Froment's sign」の詳細全文を読む スポンサード リンク
|