Pathomechanics of the thumb trapeziometacarpal joint.

摘要: As the human thumb climbed evolutionary ladder, trapeziometacarpal joint was provided greater mobility at expense of decreased bony stability. Soft tissue restraints were left to provide primary stabilization basal complex. Both degenerative and traumatic conditions compromise function these ligamentous structures result in translational instability surfaces secondary arthritic disease. Primary idiopathic osteoarthritis, Bennett's fracture-dislocation, metacarpophalangeal hypermobility all impart a disturbance biomechanics while extension metacarpal osteotomy, ligament reconstruction, imposed flexion mitigate effects improve kinematics. compact amenable en bloc resection, complex affords unique opportunity study inter-relationship between biology pathogenesis