Ischial tuberosity

Ischial tuberosity is a large swelling posteriorly on the superior ramus of the Ischium. It is also known as the sitting bone. It is divided into two portions: a lower, rough, somewhat triangular part, and an upper, smooth, quadrilateral part. The ischial tuberosity bears the weight of the body when sitting.

Anatomy[edit | edit source]

The Ischium is one of the three parts of the hip bone, or os coxae, and the ischial tuberosity is a part of this bone. It is located on the posterior side of the body, and is the part of the body that makes contact with the ground when we sit down. The ischial tuberosity is connected to various muscles and ligaments, including the semimembranosus, semitendinosus, biceps femoris, and adductor magnus muscles.

Function[edit | edit source]

The ischial tuberosity serves as an attachment site for several muscles, including the hamstring muscles and the sacrotuberous ligament. It also serves as a support for the body when sitting. The ischial tuberosity is particularly important in weight distribution during sitting, as it bears the weight of the body.

Clinical significance[edit | edit source]

Injuries or conditions affecting the ischial tuberosity can cause pain and discomfort, particularly when sitting. These conditions include ischial bursitis, also known as weaver's bottom, and hamstring injuries. Ischial bursitis is inflammation of the bursa that lies over the ischial tuberosity, while hamstring injuries often involve a tear or strain of the muscles attached to the ischial tuberosity.