Is there a sesamoid bone in the thumb?

Most people have five sesamoid bones in each hand. Two at the thumb metacarpophalangeal joint, one at the interphalangeal joint of the thumb, one at the metacarpophalangeal joint of the index finger on the radial side, and one at the metacarpophalangeal joint of the little finger on the ulnar side.

What does the sesamoid bone in the thumb do?

A sesamoid is a bone embedded within a tendon. This name derives from the oval seeds of the plant “sesamum indicum” [1]. Sesamoid bones are located where a tendon passes over a joint, such as the hand, wrist, knee, and foot. The main function of the sesamoid is to decrease friction and to protect the tendon.

What is the fastest way to cure Sesamoiditis?

Sesamoiditis

1. Stop the activity causing the pain.
2. Take aspirin or ibuprofen to relieve the pain.
3. Rest and ice the sole of your feet.
4. Wear soft-soled, low-heeled shoes.
5. Use a felt cushioning pad to relieve stress.

Where are the sesamoid bones in the thumb?

The sesamoid bones are two pea-sized bones embedded in the volar plate of the thumb. The volar plate is actually a very thick ligament that prevents hyperextension of the joint. The volar plate also reinforces the joint capsule and gives the joint greater stability.

Are there sesamoid bones in the IP joint?

Sesamoid bones were found in the IP joint of the thumb at 67% (212 of 318), while the index, middle, ring, little fingers had sesamoid bones in the proximal interphlangeal (PIP) joint at 0% (0 of 172), 0.4% (1 of 244), 0.5% (1 of 183), and 1% (2 of 179), respectively.

How does sesamoiditis of the thumbs cause pain?

The sesamoid bones lift the tendons and their attached muscles away from the joint to increase the mechanical advantage needed for smooth thumb motion. If the sesamoids are injured or starting to degenerate, they can be a source of severe pain and disability.

What causes dislocation of the thumb interphalangeal joint?

Cases in which reduction was blocked by the volar plate, the flexor pollicis longus (FPL) tendon, the sesamoid bone, and an osteochondral fragment have been described in the literature. This article reports a case of closed thumb IP joint dislocation caused by the displacement of the FPL tendon.