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Journal of the Korean Society for Surgery of the Hand 2006;11(3):193-196.
Published online September 1, 2006.
Locking of the Metacarpophalangeal Joint of the Thumb - Report of three cases -
Seong-Man Lee, Sang-Ho Cheon, In-Ho Jeon, Jae-Woo Park, Poong-Taek Kim
무지 중수지 관절 잠김 - 3례 보고 -
이성만, 천상호, 전인호, 박재우, 김풍택
Locking of the metacarpophalangeal joint of the thumb following forced hyperextension is rare. Unlike the locking that occurs with metacarpophalangeal dislocation of the other fingers in flexion, it is locked in mild hyperextension at the metacarpophalangeal joint of the thumb, which can not be flexed actively. The main pathology is thought to be a constriction ring over the radial condyle of the metacarpal head, which is formed by a torn volar plate proximal to the radial sesamoid bone and radial accessory collateral ligament. Manual reduction is successful, if the dislocated ligament bundle is not too tight. If gentle manipulation fails, surgery is generally recommended to release the locking, that is, release of accessory collateral ligament. We present three cases of locking of the metacarpophalangeal joint of the thumb, which we treated successfully with closed reduction.

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