The swan neck is composed of a hyperextension of the proximal interphalangeal (PIP) joint, a flexion in the distal interphalangeal (DIP) joint, and sometimes additionally a flexed position in the metacarpophalangeal joint (MCP joint;. Buttonhole and Schwanenhalsdeformitäten).

The swan neck is composed of a hyperextension of the proximal interphalangeal (PIP) joint, a flexion in the distal interphalangeal (DIP) joint, and sometimes additionally a flexed position in the metacarpophalangeal joint (MCP joint;. Buttonhole and Schwanenhalsdeformitäten). Buttonhole and Schwanenhalsdeformitäten. The swan neck is typical of the RA, but it also occurs in other causes, incl. An untreated mallet finger, a weakness of the volar ligaments of the PIP joint (as described for. Example by rheumatic fever or SLE occurs as Jaccoud arthropathy ), spasticity of the intrinsic hand muscles, a rupture of the flexor tendon of the PIP joint and a faulty healing of a fracture of the middle or proximal phalanx. Since it is not possible to correct the hyperextension in the PIP joint or compensate for a complete finger when gripping conclusion is impossible, a severe disability can result. The treatment aims (to correct or z. B. a mallet finger or a bony deformity to release the spasticity of the intrinsic muscles) the underlying disorder to eliminate possible. Light deformities as part of an RA may be treated by a functional ring rail. The real swan neck saves of the thumb, which has only one interphalangeal joint. However, a severe hyperextension of this joint in combination with flexion of the MCP joint occurs, it is called a 90-90 deformity. At the same time instability of the thumb grasping be severely impaired. This deformity can usually be corrected by a Interphalangealarthrodese in combination with a tendon repair the MCP joint.

Health Life Media Team

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