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ORIGIN Common extensor origin on anterior aspect of lateral epicondyle of humerus. INSERTION Extensor expansion of little finger-usually two tendons which are joined by a slip from extensor digitorum at metacarpophalangeal joint.RIGIN Common extensor origin on anterior aspect of lateral epicondyle of humerus. INSERTION Extensor expansion of little finger-usually two tendons which are joined by a slip from extensor digitorum at metacarpophalangeal joint.
The term boutonniere comes from the French word for buttonhole.. This injury involves a disruption of the central slip of the extensor tendon at its insertion on the middle phalanx. The mechanism of injury is a blow to the dorsum of the PIP joint, such as when an athlete's hand is stepped on. Occasionally, a small fleck fracture of the middle phalanx is seen at the central slip insertion. Volar dislocation of the PIP joint is thought to be a component in many cases.