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The ischial tuberosity (or tuberosity of the ischium, tuber ischiadicum), also known colloquially as the sit bones or sitz bones, [1] or as a pair the sitting bones, [2] is a large posterior bony protuberance on the superior ramus of the ischium. It marks the lateral boundary of the pelvic outlet.
These fractures occur at tubercles (bony projections that lack secondary ossification centers). Avulsion fractures occur where muscles are attached: anterior superior and inferior iliac spines, ischial tuberosities, and ischiopubic rami. A small part of bone with a piece of a tendon or ligament attached is avulsed (torn away). [3]
Pelvic fractures make up around 3% of adult fractures. [1] Stable fractures generally have a good outcome. [1] The risk of death with an unstable fracture is about 15%, while those who also have low blood pressure have a risk of death approaching 50%. [2] [4] Unstable fractures are often associated with injuries to other parts of the body. [3]
Similar calcification and ossification may be seen at peripheral entheseal sites, including the shoulder, iliac crest, ischial tuberosity, trochanters of the hip, tibial tuberosities, patellae, and bones of the hands and/or feet. [6] DISH can be a complicating factor when suffering from trauma involving the spine.
Multidetector computed tomography (MDCT) is a highly valuable imaging tool for the diagnosis of occult fractures. CT has several advantages including short acquisition time (compared to MRI), the ability to acquire volumetric and isotropic image data sets, the opportunity to reconstruct multiplanar reformations in any arbitrary plane, and excellent spatial resolution.
fracture of the distal third of the humerus resulting in entrapment of the radial nerve: Holstein-Lewis fracture at Orthopedic Weblinks Holdsworth fracture: Sir Frank Wild Holdsworth: unstable spinal fracture-dislocation at the thoracolumbar junction: Thoracic Spine Fractures and Dislocations at eMedicine: Hume fracture: A.C. Hume
If the athlete is fatigued or has not warmed up properly he/she may suffer a hamstring strain/rupture, which is the tearing of the hamstring muscle. Avulsion of the biceps femoris tendon is the complete pulling away of the tendon from the bone. This most commonly occurs where the long head attaches to the ischial tuberosity.
The ischium is the strongest of the three regions that form the hip bone. It is divisible into three portions: the body, the superior ramus, and the inferior ramus. The body forms approximately one-third of the acetabulum. The ischium forms a large swelling, the tuberosity of the ischium, also referred