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This nerve is the most commonly injured nerve in proximal humerus fractures due to its location close to the proximal humerus. [12] Muscles that attach to the proximal humerus and can cause a deforming force on fracture fragments include the pectoralis major, the deltoid, and the rotator cuff muscles. [11]
Among proximal fractures, 80% are one-part, 10% are two-part, and the remaining 10% are three- and four-part. [22] The most common location of proximal fractures is at the surgical neck of the humerus. [3] Incidence of proximal fractures increases with age, with about 75% of cases occurring among people over the age of 60. [11]
The Müller AO Classification of fractures is a system for classifying bone fractures initially published in 1987 [1] by the AO Foundation as a method of categorizing injuries according to therognosis of the patient's anatomical and functional outcome. "AO" is an initialism for the German "Arbeitsgemeinschaft für Osteosynthesefragen", the ...
impacted posterior humeral head fracture occurring during anterior shoulder dislocation: Hill Sachs Lesion at Wheeless' Textbook of Orthopaedics online Holstein–Lewis fracture: Arthur Holstein Gwylim Lewis: fracture of the distal third of the humerus resulting in entrapment of the radial nerve: Holstein-Lewis fracture at Orthopedic Weblinks
When the humerus is driven from the glenoid cavity, its relatively soft head impacts against the anterior edge of the glenoid. The result is a divot or flattening in the posterolateral aspect of the humeral head, usually opposite the coracoid process. The mechanism which leads to shoulder dislocation is usually traumatic but can vary ...
In patients younger than 12, proximal humerus fractures can be visualized due to the changes at the bone surface. [15] Because bone tumors can appear at this location, X-ray imaging is necessary following a fracture diagnosis. The standard procedure is the shoulder-SAFE algorithm. [15]
An anatomical classification may begin with specifying the involved body part, such as the head or arm, followed by more specific localization. Fractures that have additional definition criteria than merely localization often may be classified as subtypes of fractures, such as a Holstein-Lewis fracture being a subtype of a humerus fracture ...
Complications can include fracture of the humerus or biceps tendon rupture. [2] The cause in most cases is unknown. [1] The condition can also occur after injury or surgery to the shoulder. [2] Risk factors include diabetes and thyroid disease. [1] [4] [5] The underlying mechanism involves inflammation and scarring.