Ischial Tuberosity

Description

Insertion of hamstring tendons on the ischial tuberosity

Transverse sonogram between the greater trochanter and ischial tuberosity showing the hypoechoic subgluteal space between the hyperechoic perimysium of the gluteus maximus and the quadratus femoris muscle. The sciatic nerve is seen as a hyperechoic nodule in the medial aspect of the subgluteal space

Name

• Ischial Tuberosity
• Tuber ischiadicum
• Sitting Bone
• Tuberosity of the Ischium
• Sit Bones
• Sitz Bones

General

• Large round protrusion at the inferoposterior aspect of the ischium, on the superior ramus
• Where the weight of the body is held when seated
• Lateral boundary of the pelvic outlet

Attachments

• Sacrotuberous Ligament
• Inferior Gemellus
• Quadratus Femoris
• Adductor Magnus
• Biceps Femoris
• Semitendinosus
• Semimembranosus

Divisions

• Lower Portion
  • Subdivided by a prominent longitudinal ridge, passing from base to apex, into two parts
  • Outer gives attachment to the adductor magnus
  • Inner to the sacrotuberous ligament
• Upper portion
  • Subdivided into two areas by an oblique ridge, which runs downward and outward
  • From the upper and outer area the semimembranosus arises
  • From the lower and inner, the long head of the biceps femoris, semitendinosus

Inter-ischial line

• Divides the perineum into the anterior urogenital triangle and posterior anal triangle

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Clinical Significance

• Ischial Bursitis
• Proximal Hamstring Tendinopathy
• Ischial Bursa Injection

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See Also

• Hip Pain Main
• Hip Anatomy Main
• Physical Exam Hip

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