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In part based on these concerns, some surgeon prefer to maintain the lunate in patients younger than 40 years proximal row carpectomy. [6] [18] A surgery called four-corner arthrodesis is an option. [6] The capitate, lunate, hamate and triquetrum are fused together in this procedure and the scaphoid is excised.
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.
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 ...
The cavity of the midcarpal joint is very extensive and irregular. The major portion of the cavity is located between the distal surfaces of the scaphoid, lunate, and triquetrum and proximal surfaces of the four bones of the distal row. Proximal prolongations of the cavity occur between the scaphoid and lunate and between the lunate and triquetrum.
An example of a coalition between the trapezoid and capitate carpal bones. The lunate and triquetral bones are the most common carpal bones to fuse together, resulting in a lunotriquetral coalition in 1% of people. 60% of patients with a lunotriquetral coalition will have it bilaterally. [1]
Anatomic illustrations of the wrist depicting the progressive stages of scapholunate advanced collapse. (A) Normal wrist demonstrating an intact scapholunate ligament (white arrowhead), normal scapholunate interval, and preservation of the joint spaces. (S = scaphoid, L = lunate, C = capitate, R = radius, U = ulna).
Ulnar triquetral column: triquetrum and hamate; In this context the pisiform is regarded as a sesamoid bone embedded in the tendon of the flexor carpi ulnaris. [4] The ulnar column leaves a gap between the ulna and the triquetrum, and therefore, only the radial or scaphoid and central or capitate columns articulate with the radius.
Four corner fusion, or partial wrist arthrodesis, is a procedure which involves resection/removal of the scaphoid bone and fixation of the remaining wrist bones with a plate or wires. [1] The procedure is usually performed due to wrist arthritis or due to scaphoid collapse.