What muscles flex the MCP joint?
The extensor pollicis brevis, extensor indicis proprius, extensor digitorum communis, and extensor digiti minimi extend the MCP joints (von Schroeder, 1993). The flexors are the flexor pollicis brevis, lumbricals, interossei, and flexor digiti minimi brevis, assisted by the long flexors.
What muscle extends the thumb at metacarpophalangeal joint?
Muscles acting on the metacarpophalangeal joint Extension of the thumb (from the flexed position) is mainly produced by the extensor pollicis brevis, with some help from extensor pollicis longus muscle.
What type of joint is the MCP of the thumb?
The metacarpophalangeal (MCP) joints are diarthrodial joints where the large convex heads of the distal aspect of the metacarpals articulate with the concave-shaped proximal aspect of each phalange.
What causes pain in the MCP joint of the thumb?
Causes of Metacarpophalangeal (MCP) Joint Arthritis Traumatic injury leading to broken bone or loss of cartilage (Post-traumatic arthritis) Routine wear and tear of the MCP joint (osteoarthritis) Certain medical conditions (gout, pseudogout, psoriasis, etc.) Infections (after a cut, puncture or animal bite)
What is the thumb flexor muscle?
Flexor pollicis longus is the only muscle that flexes the interphalangeal joint of the thumb, which makes it vital for activities that require hand gripping. Flexor pollicis longus also flexes the thumb at the metacarpophalangeal joint and contributes to the flexion of the wrist.
Which muscles extend the thumb?
| Extensor pollicis longus muscle | |
|---|---|
| Actions | extension of the thumb (metacarpophalangeal and interphalangeal) |
| Antagonist | Flexor pollicis longus muscle, Flexor pollicis brevis muscle |
| Identifiers | |
| Latin | musculus extensor pollicis longus |
What is the 3rd MCP joint?
It extends from the metacarpal neck to the base of the proximal phalanx. Dorsally it is reinforced by the common extensor tendon and volarly by the volar plate and the deep transverse metacarpal ligament (DTML).
Where is the 1st MCP joint?
The 1st CMC (carpometacarpal) joint is a specialized saddle-shaped joint at the base of the thumb. The trapezium carpal bone of the wrist and the first metacarpal bone of the hand form the 1st CMC or thumb basal joint.
How do you treat MCP pain?
How is Metacarpophalangeal (MCP) Joint Arthritis Treated?
- Activity modification or hand therapy.
- Anti-inflammatory medications (oral or steroid injections)
- Cortisone injections (if medication fails)
- Simple splinting or flexible strapping.
- Topical skin creams.
How do you treat a sprained MCP?
Finger metacarpophalangeal (MCP) joint collateral ligament sprains should not be overtreated. First-degree sprains may require a brief period of protection, usually consisting of buddy taping for 2-3 weeks. Second-degree sprains are immobilized in mid flexion for 3 weeks.
What is Linburg Comstock syndrome?
The Linburg-Comstock (LC) syndrome is distinguished by the inability to actively flex the interphalangeal (IP) joint of the thumb without simultaneously flexing the distal IP joint of the index finger.