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The lunate is a crescent-shaped carpal bone found within the hand.The lunate is found within the proximal row of carpal bones. Proximally, it abuts the radius.Laterally, it articulates with the scaphoid bone, medially with the triquetral bone, and distally with the capitate bone.
Dislocations are commonly caused by sudden trauma to the joint like during a car accident or fall. A joint dislocation can damage the surrounding ligaments, tendons, muscles, and nerves. [2] Dislocations can occur in any major joint (shoulder, knees, hips) or minor joint (toes, fingers). The most common joint dislocation is a shoulder ...
The scapholunate ligament is an intraarticular ligament binding the scaphoid and lunate bones of the wrist together. It is divided into three areas, dorsal, proximal and palmar, with the dorsal segment being the strongest part. [3] It is the main stabilizer of the scaphoid. In contrast to the scapholunate ligament, the lunotriquetral ligament ...
Lunate dislocation References. External links This page was last edited on 21 May 2018, at 13:57 (UTC). Text is available under the Creative ...
Kienböck's disease is a disorder of the wrist.It is named for Dr. Robert Kienböck, a radiologist in Vienna, Austria who described osteomalacia of the lunate in 1910. [1]It is breakdown of the lunate bone, a carpal bone in the wrist that articulates with the radius in the forearm.
In radiology, the Terry-Thomas sign is a scapholunate ligament dissociation on an anteroposterior view of the wrist. [1] [2] Most commonly a result of a fall on the outstretched hand (), the scapholunate ligament ruptures resulting in separation of the lunate and scaphoid bones.
- A line perpendicular to the distal articular surface of the lunate bone. It should normally be 30°-60°. [1] Dorsal intercalated segment instability (DISI) is a deformity of the wrist where the lunate bone angulates to the dorsal side of the hand. [2] [3]
Tear drop angle less than 45 degrees indicates displacement of lunate facet. [5] Antero-posterior distance (AP distance) - Seen on lateral X-ray, it is the distance between the dorsal and volar rim of the lunate facet of the radius. The usual distance is 19 mm. [5] Increased AP distance indicates the lunate facet fracture. [8]