– Criteria for Unstable Frx: – Neurologic deficit; – Posterior Element Injuries; – Loss of more than 50% of anterior vertebral body height; – Greater than 25 to 35 deg of kyphosis; – Thoracolumbar burst frx: – angulation of thoracolumbar … Read more
– Discussion: – uncovertebral joint arthrosis involves what is known as the joints of Luschka, extending from C3 to C7; – lateral aspect of vertebral body has superior projection (uncinate process); – as the disks become degenerative, these projections approximate w/ body of the next highest vertebra; … Read more
– Discussion: – unilateral bar is a common disorder and is likely to progress; – it is caused by failure of segmentation of posterior elements of two or more vertebrae on one side; – this anomaly carries a predictable poor prognosis & therefore a patient w/ this anomaly should … Read more
– See: – Facet Joint Injuries – Hyperflexion Injuries – Oblique projections; – Pillar View – Discussion: – simple unilateral facet dislocation is often a stable injury, eventhough there is disruption of the posterior ligament complex (involved joint capsule, posterior longitudinal ligament, … Read more
– Discussion: – distal radioulnar subluxation/dislocation (see TFC Injury) – tear of the lunotriquetral – ulnocarpal impingement syndromes – pisotriquetral osteoarthritis – pisotriquetral loose bodies – subluxation/dislocation of the pisiform – fractures (ulnar styloid Process) – chondromalacia – calcific tendinitis – medial carpal instability – radioulnar arthritis – subluxation of the ECU The ulnar impaction … Read more
– See: biomechanics menu: – Discussion: – maximum load that metal can withstand in a single application without breaking; – w/ application of a load, maximum stress will be achieved; – this is ultimate tensile strength, & is maximum stress material can sustain before fracturing; … Read more
– Anatomy: – Tunnel V: – overlies distal ends of radioulnar articulation on dorsum of wrist, contains EDM; – Tunnel VI: – in groove between the apex of ulnar styloid process & ulnar head, contains ECU tendon which is palpable from … Read more
– Discussion: – most frequent radiocarpal instability; – the lunate is translocated ulnarly, and therefore is not supported by the radius; – ulnar translationn is also commonly seen in disease such as RA or in Madelung’s deformity; – in RA, may occur along … Read more
Type Age Pathology / Other Congenital Child Congenital dysplasia of S1 superior facet Isthmic … Read more
(see also: Both Bone Forearm Fracture: / Ulnar Styloid Process) Anatomy radius & ulna lie parallel to each other when forearm is supinated; during pronation radius crosses ulna, rotating on axis that passes from capitulum through the distal end of ulna; ular side of wrist is supported by TFCC, which articulates w/ both lunate and triquetrium; … Read more