swan neck deformity скачать в хорошем качестве

swan neck deformity

A characteristic deformity in the finger in which the proximal interphalangeal (PIP) joint hyperextends and the distal interphalangeal (DIP) joints bends downward. In the thumb, the metacarpophalangeal (MCP) joint hyperextends and the interphalangeal (IP) joint bends. (Comparison of the deformity in the thumb) swan neck deformity: IP joint bends and MCP joint hyperextends. duck-bill thumb deformity: IP joint bends and MCP joint does not hyperextend. (Causes) • rheumatoid arthritis: Most common. Weakens or ruptures the stabilizing tissues around the joints and alters the joints' mechanics. • metacarpophalangeal (MCP) joint volar subluxation: Caused by rheumatoid arthritis. • lax volar plate (thick ligament on the palm side of the PIP joint) • mallet finger • flexor digitorum superficialis (FDS) laceration • intrinsic contracture (permanent shortening of a muscle or joint) • imbalance of muscle forces on the PIP • hyperextension injury to the PIP joint • improperly-healed finger fracture • cerebral palsy (Treatment) • No need: If the deformity is painless and does not affect function of the hand. • PIP splinting: Prevents hyperextension. • volar plate advancement with central slip tenotomy