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The Articulations of the Upper Member
Published in Gene L. Colborn, David B. Lause, Musculoskeletal Anatomy, 2009
Gene L. Colborn, David B. Lause
The Distal Radio-ulnar Joint. The distal radio-ulnar joint is of the trochoid or pivot-type, the head of the ulna articulating with the ulnar notch of the distal end of the radius. The rotation of the distal end of the radius about the head of the ulna results in pronation and supination of the forearm. The two bones are held together distally by a number of ligamentous structures, the most important of which is the the fibrocartilaginous articular disk which joins the two bones together and which serves to separate the distal end of the ulna from direct contact with the carpal bones. Distally, the fibrocartilaginous disk is in contact with the triquetral bone and the medial part of the lunate bone.
Skeletal System
Published in David Sturgeon, Introduction to Anatomy and Physiology for Healthcare Students, 2018
There are many different bones to break and many different ways to break them. The only bone I have broken (so far) is the rather unimpressive triquetral bone of the wrist. I jumped over a low wall (in the dark) without realising that the drop on the other side was considerably more than two feet! I distinctly remember thinking at the time ‘Where has the ground gone?’ before painfully rediscovering it (left hand first). There are many different ways to classify fractures including open and closed (whether the skin is open or closed over/around the broken bone/s), the shape of the fracture (transverse, spiral, wedge, etc.), the mechanism of injury (stress, crush, avulsion, etc.), the position of the fracture (distal, proximal, supracondylar, etc.) or the name of the person who first described it (e.g. a Pott’s fracture is named after the 18th-century surgeon Percivall Pott who documented his own painful experience when he broke his ankle). Children’s bones are typically much more flexible than adults and they often suffer partial or ‘greenstick’ fractures. The term greenstick refers to the fact that if you snap a young piece of wood (a green stick) it often snaps on the outer side of the bend but the inner side remains intact. The reason this occurs in children is partly due to the thick fibrous periosteum that surrounds immature bone and partly due to their greater flexibility. Another type of fracture unique to children are those involving the growth plate or physis. There are five common types of growth plate fracture, first classified by orthopaedic surgeons Robert Salter and Robert Harris in 1963 and known as Salter–Harris fractures. The mnemonic SALTER can be used to remember the presentation of each type: It is important that these injuries are correctly diagnosed and treated since they can interfere with normal bone growth and development.
Experiences with Osteoligamentoplasty According to Weiss for the Treatment of Scapholunate Dissociation
Published in Journal of Investigative Surgery, 2018
W. Petersen, J. Rothenberger, H. E. Schaller, A. Rahmanian-Schwarz, M. Held
Then, instead of using two slightly crossed Kirschner-wires (K-wires) through the scaphoid and lunate like Weiss et al. originally did, also one 1.2 mm K-wire was drilled from the anatomic snuffbox through the scaphoid into the lunate, temporarily transfixing the two bones in their appropriate alignment, another through the scaphoid into the capitate and a third K-wire transfixed the triquetral bone and lunate to establish a firm and secure connection between the carpal bones. The two joysticks were subsequently removed (Figure 6).