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Journal of Hand Surgery (British and European Volume)
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Articles

Extensor Mechanism Laxity at the Metacarpophalangeal Joint as Identified by a New Provocative Test: Predisposition to Dislocation

T. SHINOHARA
R. NAKAMURA
M. SUZUKI
N. MAEDA

From the Department of Orthopaedic Surgery, Tokai Hospital, Nagoya, Japan and the Department of Hand Surgery, Nagoya University School of Medicine, Nagoya, Japan

Correspondence: Dr Takaaki Shinohara, MD, Department of Orthopaedic Surgery, Tokai Hospital, 1-1-1 Chiyodabasi Chikusaku, Nagoya 464-8512, Japan. Tel.: +81 52 711 6131; fax: +81 52 712 0052. E-mail: shino-p{at}kg8.so-net.ne.jp

A tendon subluxation test was performed on the unaffected side in 13 patients with traumatic extensor tendon dislocation of the middle finger and on both middle fingers in 800 healthy controls to identify extensor mechanism laxity at the metacarpophalangeal joint. Ten of the 13 patients with dislocation had laxity of middle finger extensor tendon, compared with 174 of the 800 (22%) controls. The difference in these rates of extensor tendon laxity is significant (P<0.0001), and suggests that extensor mechanism laxity at the metacarpophalangeal joint may predispose to traumatic extensor tendon dislocation.

Key Words: extensor • tendon subluxation • dislocation • metacarpophalangeal joint • provocative test • sagittal band

Journal of Hand Surgery (British and European Volume), Vol. 30, No. 1, 79-82 (2005)
DOI: 10.1016/J.JHSB.2004.09.002
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