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The palmar ulnocarpal ligament is a ligament of the radiocarpal joint. It consists of ulnolunate, ulnocapitate, and ulnotriquetal ligaments.
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The wrist (), composed of the carpal bones, articulates at the wrist joint (or radiocarpal joint) proximally and the carpometacarpal joint distally. The wrist can be divided into two components separated by the midcarpal joints. The small movements of the eight carpal bones during composite movements at the wrist are complex to describe, but flexion mainly occurs in the midcarpal joint whilst extension mainly occurs in the radiocarpal joint; the latter joint also providing most of adduction and abduction at the wrist. 3D Medical Animation still shot of Human Wrist How muscles act on the wrist is complex to describe.
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Joints can also be classified based on their anatomy or on their biomechanical properties. According to the anatomic classification, joints are subdivided into simple and compound, depending on the number of bones involved, and into complex and combination joints: # Simple joint: two articulation surfaces (e.g. shoulder joint, hip joint) # Compound joint: three or more articulation surfaces (e.g. radiocarpal joint) # Complex joint: two or more articulation surfaces and an articular disc or meniscus (e.g.
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Total DRUJ replacement An alternative treatment for patients with ulnar-sided wristpain is a total replacement of the distal radial-ulnar joint. There are many surgical treatments of the condition, but most of these only improve the alignment and function of the radiocarpal joint. A persistent problem in these treatments has been the stiff DRUJ. However, a prosthesis helps in managing the pain, and might also improve the range of motion of the wrist.
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Osteoarthritis between the radius bone and the carpals is indicated by a radiocarpal joint space of less than 2mm. SLAC Because SLAC results from scapholunate ligament rupture, there is a larger space between the two bones, also known as the Terry Thomas sign. Osteoarthritis and a space larger than 3 mm is suspicious and a space larger than 5 mm is a proven SLAC pathology. Scaphoid instability due to the ligament rupture can be stactic or dynamic.
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A Barton's fracture is an intra-articular fracture of the distal radius with dislocation of the radiocarpal joint. There exist two types of Barton's fracture – dorsalDorsal Barton's Fracture / Dorsal Shearing Frx – Wheeless' Textbook of Orthopaedics and palmar, the latter being more common. The Barton's fracture is caused by a fall on an extended and pronated wrist increasing carpal compression force on the dorsal rim. Intra-articular component distinguishes this fracture from a Smith's or a Colles' fracture.
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During palmar flexion the proximal carpal bones are displaced towards the dorsal side and towards the palmar side during dorsiflexion. While flexion and extension consist of movements around a pair of transverse axes -- passing through the lunate bone for the proximal row and through the capitate bone for the distal row -- palmar flexion occurs mainly in the radiocarpal joint and dorsiflexion in the midcarpal joint. Dorsiflexion is produced by (in order of importance) extensor digitorum, extensor carpi radialis longus, extensor carpi radialis brevis, extensor indicis, extensor pollicis longus, and extensor digiti minimi. Palmar flexion is produced by (in order of importance) flexor digitorum superficialis, flexor digitorum profundus, flexor carpi ulnaris, flexor pollicis longus, flexor carpi radialis, and abductor pollicis longus.
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