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The hip is the largest ball-and-socket joint in the body. The thighbone (femur) fits tightly into a cup-shaped socket (acetabulum) in the pelvis. The hip joint is held together by muscles of the buttocks, groin, and spine; tendons; ligaments; and a joint capsule.
| By | Healthwise Staff |
| Primary Medical Reviewer | Susan C. Kim, MD - Pediatrics |
| Specialist Medical Reviewer | John Pope, MD - Pediatrics |
| Last Revised | March 12, 2012 |