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Anatomy Of The Thumb Ligaments

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Any hard force on the thumb that pulls the thumb away from the hand called a valgus force can cause damage to the ulnar collateral ligaments. The dorsal ligaments comprise the dorsal radial ligament posterior oblique ligament and intermetacarpal ligament fig 1.

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These ligaments are best seen on sagittal mr images of the thumb.

Anatomy of the thumb ligaments. Any hard force on the thumb that pulls the thumb away from the hand called a valgus force can cause damage to the ulnar collateral ligaments. This tendon helps you bend the thumb. This ligament is responsible for preventing hyperextension.

The collateral ligaments are called the anterior and posterior ligaments. There are nine interphalangeal joints in each hand two on each finger and one in the thumb. Joint capsule of the thumb.

The radius and the scaphoid bone is taut when the hand is brought into ulnar deviation. The volar plate of the thumb is a very thick ligament that forms the bottom of the interphalangeal joint and separates the joint space from the tendon sheath. The dorsal ligaments form a near continuous deltoid shaped ligament complex best seen in the sagittal plane.

This tendon travels along the back of the thumb and helps straighten the thumb. Most frequently the ulnar collateral ligament of the metacarpophalangeal joint is affected 13 13 1821. This tendon helps you move the thumb away from the palm to form an open hand.

The collateral ligament complex is the main stabilizer of the metacarpophalangeal and the interphalangeal joints of the thumb 1318. When the thumb is straight the collateral ligaments are tight and stabilize the joint against valgus force. The radial collateral ligament between the styloid process of.

But with enough hyperextension force the volar plate can be sprained or ruptured. Extensor pollicis brevis. The thumb joint has two collateral ligaments as well as the capsule which is lined by a synovial membrane.

The volar and dorsal ligaments of the thumb cmc joint are best seen on sagittal images and the iml is best seen in the coronal plane. The joint that is affected is called the metacarpophalangeal joint or mcp joint. The ulnar collateral ligament between the styloid process of the ulna and the triquetral and pisiform bones is under tension during radial deviation of the hand.

The normal mr imaging appearance of the thumb cmc joint ligaments is demonstrated in figures 5 and 6. When the thumb is straight the collateral ligaments are tight and stabilize the joint against valgus force. They are responsible for reinforcing the thumb.

There are four thumb tendons. Collateral ligament injuries cause instability of thumb grip and pinch. The dorsal thumb cmc ligaments from a right hand showing the dorsal deltoid ligament complex consisting of the dorsal radial ligament drl dorsal central ligament dcl and posterior oblique ligament pol all emanating from the dorsal tubercle of.

The joint that is affected is called the metacarpophalangeal joint or mcp joint. These ligaments are best seen on sagittal mr images of the thumb.

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