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The hip joint is classified as a ball and socket joint. This type of synovial joint allows for multidirectional movement and rotation. There are two bones that make up the hip joint and create an articulation between the femur and pelvis. This articulation connects the axial skeleton with the lower extremity.
An acetabular labrum tear or hip labrum tear is a common injury of the acetabular labrum resulting from a number of causes including running, hip dislocation, and deterioration with ageing. Most are thought to result from a gradual tear due to repetitive microtrauma .
Each innominate bone (ilium) joins the femur (thigh bone) to form the hip joint; thus the sacroiliac joint moves with walking and movement of the torso. [9] In this joint, hyaline cartilage on the sacral side moves against fibrocartilage on the iliac side. The sacroiliac joint contains numerous ridges and depressions that function in stability.
Occult hip fracture, a fine crack somewhere in the hip socket, common in elderly women and those with osteoporosis, usually only in one hip; Snapping hip, a condition caused by iliotibial band snap, iliopsoas tendon snap, and hip labral tear, usually only in one hip; may be accompanied by an audible "snap" when the hip joint is moved
Sacroiliac joint pain may be felt anteriorly, however, care must be taken to differentiate this from hip joint pain. Women are considered more likely to suffer from sacroiliac pain than men, mostly because of structural and hormonal differences between the sexes, but so far no credible evidence exists that confirms this notion.
The International Cartilage Repair Society has set up an arthroscopic grading system by which cartilage defects can be ranked: grade 0: (normal) healthy cartilage; grade 1: the cartilage has a soft spot, blisters, or superficial wear; grade 2: minor tears of less than one-half the thickness of the cartilage layer
Intra-articular snapping hip syndrome is often indicative of injury such as a torn acetabular labrum, ligamentum teres tears, loose bodies, articular cartilage damage, or synovial chondromatosis (cartilage formations in the synovial membrane of the joint). [citation needed]
Joint effusion and limited range of motion are common associated features. It affects primarily large joints, including knee (>50% of cases), elbow, hip, and shoulder. SOC is twice as common in men as women. Some patients have intra-articular bodies resting in stable positions within joint recesses or bursae.