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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.
Normally the greater trochanter of the femur lies below this line, but in cases of iliac joint dislocation [1] of the hip or fracture of the neck of the femur the trochanter is felt above or in the line. [2] Though the line can be of help for diagnosis of fractures, its practical value is disputed. [3]
Figure 5: Traumatic fracture of the greater tuberosity in a 51-year-old man presenting with left shoulder pain after a fall on ice. Initial radiographs were normal. Coronal inversion recovery MRI shows a fracture line (arrow) through the greater tuberosity surrounded by a bone marrow edema pattern. [1]
This area is prone to fractures due to high velocity trauma in the young and trivial trauma in the elderly. The fractures in this line are called intertrochantric fractures and are classified as per the pattern of the fracture geometry. After a fracture this area of bone is notorious for uniting in varying, and sometimes problematic angles.
Clinically, an avulsion fracture of the ischial tuberosity may occur. [ 2 ] Avulsion fractures of the hip bone (avulsion or tearing away of the ischial tuberosity) may occur in adolescents and young adults during sports that require sudden acceleration or deceleration forces, such as sprinting or kicking in football, soccer, jumping hurdles ...
The greater trochanter of the femur is a large, irregular, quadrilateral eminence and a part of the skeletal system. It is directed lateral and medially and slightly posterior. In the adult it is about 2–4 cm lower than the femoral head. [1] Because the pelvic outlet in the female is larger than in the male, there is a greater distance ...
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.
Proximal fractures of 5th metatarsal. The tuberosity avulsion fracture (also known as pseudo-Jones fracture or dancer's fracture [2] is a common fracture of the fifth metatarsal (the bone on the outside edge of the foot extending to the little toe). [3] This fracture is likely caused by the lateral band of the plantar aponeurosis (tendon). [4]