Advanced stages of @entity625 are sometimes characterized by an adduction @entity85 of the first metacarpal and a hyperextension @entity85 of the unstable metacarpophalangeal (MCP) joint. Stabilizing the MCP joint in these @entity1 is critical to ensure a @entity158 and efficient pinch mechanism. This study presents the anatomic basis for a novel capsulodesis technique using the volar plate that can be incorporated into any reconstructive basal joint procedure when clinically indicated. Eleven normal cadavers were dissected to expose the volar plate. The dimensions of the volar plate, relationship of the sesamoid bones to the oblique pulley, and the distance from the sesamoids to the base of the proximal phalanx were compared between specimens. The radial border of the volar plate measured 8.5    1.3 mm, ulnar border 8.8    1.0 mm, proximal border 7.5    1.0 mm, and distal border 7.8    0.6 mm. The distance between the ulnar sesamoid bone and the oblique pulley measured 12.1    1.1 mm and from the radial sesamoid to the oblique pulley measured 16.6    0.2 mm. The distance between the sesamoids and the base of the phalanx measured 2.2    0.2 mm. The anatomic studies provide a foundation on which the surgeon can understand the complex nature of the MCP joint. This study describes a novel technique for MCP capsulodesis of the thumb in which volar plate flaps are imbricated to provide stability to the MCP joint, obviating the need for suture anchors and tendon grafts.

Treatment of hyperextension deformity of the thumb metacarpophalangeal joint in XXXX : a novel technique based on an anatomic study.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity85 :: ('MESH:D009140', 'Disease') :: ['deformity'] @entity625 :: ('MESH:D001168', 'Disease') :: ['basal joint arthritis'] @entity158 :: ('MESH:D010146', 'Disease') :: ['pain-free repair']
@entity625 :: (MESH:D001168,Disease) :: ['basal joint arthritis']
