Rheumatoid arthritis often causes symptoms in the wrist; pain and deformity affect the function of the entire hand and predispose deformity of the fingers.Preventive surgery, ie, synovectomy, joint stabilization, and resection of the ulnar head may decrease pain, correct deformity, and avoid tendon ruptures in the hand.If rheumatic disease has destroyed the wrist, total or partial arthrodesis (fusion) is an appropriate way to achieve stabilization and pain relief.Currently, there is no wrist endoprosthesis available which offers practical and reliable long-term results.The data in this chapter are based mainly on retrospective clinical and radiological studies in rheumatic patients.
AnatomyThe wrist is a complex, anatomic structure including multiple joints among the long bones of the forearm (radius and ulna) and the eight bones of the wrist (carpal bones). The wrist can be divided into three different joint systems:Distal radioulnar joint (DRU joint). Together, the DRU joint and the proximal radioulnar joint of the elbow enable rotation of the forearm, ie, pronation (downward rotation) and supination (upward rotation) of the arm.The radiocarpal joint. The actual wrist between the joint surface of the radius and the first row of carpal bones. Approximately half of the upward and downward mobility of the wrist takes place in this joint.The intercarpal joints. The wrist (carpus) consists of eight carpal bones that articulate with each other, involving complex biomechanics. Approximately half of the upward and downward mobility of the wrist takes place in the joints between the The wrist first and second rows of carpal bones. The ability of the wrist to move sideways (radial-ulnar deviation) depends on the mobility in the intercarpal joints.