2023年10月30日 · Flexion of digits 2 to 5 are produced by flexor digitorum superficialis, flexor digitorum profundus, lumbricals and flexor digiti minimi brevis (fifth digit). Extension of the thumb (from the flexed position) is mainly produced by the extensor pollicis brevis, with some help from extensor pollicis longus muscle.

2024年10月2日 · Metacarpophalangeal (MCP) Joint arthritis typically presents with pain, swelling, and limited motion. Inflammatory etiology is much more common than osteoarthritis. in patients with osteoarthritis, a tendon-splitting approach can be used.

2024年9月8日 · MCP Dislocations are a dislocation of the metacarpophalangeal joint, usually dorsal, caused by a fall and hyperextension of the MCP joint. Diagnosis can be made clinically and is confirmed by orthogonal radiographs. Treatment is closed reduction unless soft tissue interposition blocks reduction, in which case open reduction is indicated.

The metacarpophalangeal joints (MCP) are situated between the metacarpal bones and the proximal phalanges of the fingers. [1] . These joints are of the condyloid kind, formed by the reception of the rounded heads of the metacarpal bones into shallow cavities on the proximal ends of the proximal phalanges. [1] .

2025年2月13日 · Flexor digitorum superficialis, flexor digitorum profundus, lumbricals, and flexor digiti minimi brevis (fifth digit) are responsible for flexing digits two through five. The extensor pollicis brevis is the primary muscle responsible for thumb extension (from the flexed position), with some assistance from the extensor pollicis longus muscle.

2023年10月6日 · MCP dislocations are much less common than proximal interphalangeal dislocations because of support from surrounding structures and protected position (2, 3). Usually occurs in index finger, thumb, or 5th finger. Nearly always a single digit, but …

2023年1月23日 · Metacarpophalangeal joint (MCPJ) dislocations are uncommon dislocations of the hand. Metacarpophalangeal joint dislocations account for ~3-5% of all dislocations 1,2. The thumb is the most commonly affect digit, followed by the little finger 2.

At the 5th MCP joint, the extensor digiti minimi tendon is ulnar to the extensor digitorum tendon. In the thin subcutaneous tissue, identify and protect the dorsal sensory branches of the radial and ulnar nerves. The dorsal venous system of the fingers has longitudinal and transverse branches. Be careful to preserve the longitudinal branches.

Axial anatomic slice (a) and corresponding fat-suppressed proton-density–weighted MR image (b) obtained at the MCP joint show the circumferential distribution of the dorsal apparatus over the dorsum of the fingers. Arrows = sagittal band. 4+ 5th MCPJ’s: Radial transverse fibers (curved arrow) of extensor hood disrupted.

The metacarpophalangeal joint pain is a common occurrence, due to the fact that the respective joints are used quite a lot and, thus, present a higher risk for the common wear and tear. The aging process, as well as a number of medical conditions can favor the appearance of …