2024年6月18日 · Femoroacetabular impingement (FAI) syndrome is painful, limited hip motion due to specific morphological abnormalities in the femoral head-neck region and/or acetabulum. Femoroacetabular impingement can lead to early degenerative disease.

2022年4月7日 · Pincer morphology refers to an abnormality of the acetabulum, in particular, acetabular overcoverage, which can be focal or global and is one cause of femoroacetabular impingement.

Hip impingement may be caused by a misshapen femoral head, deformed femoral neck, or a hip socket that covers too much of the femoral head. Over time, repetitive “bumping” or impingement of the femur on the rim of the acetabulum leads to cartilage and labral damage.

This results in excessive or abnormal coverage of the femoral head, which can lead to impingement. Acetabular Retroversion The normal acetabulum has an anteverted orientation (figure), meaning it is more open on the anterior side compared to the posterior side. ... On radiographs, signs of acetabular retroversion include: Cross-over sign - the ...

2023年6月26日 · An angle of less than 25 degrees is indicative of poor anterior coverage consistent with hip dysplasia. Pincer deformity will demonstrate an increased angle (greater than 40 degrees) because of over coverage, coxa profunda, or protrusio acetabuli.

This over-coverage typically exists along the front-top rim of the socket (acetabulum). The end result is that the labral cartilage gets pinched between the rim of the socket and the front part where the femoral head meets the femoral neck.

Femoroacetabular impingement (FAI) is a chronic hip condition caused by femoral head and acetabular malformations resulting in abnormal contact across the joint. FAI often leads to labral, cartilaginous, and tissue damage that predispose this patient population to …

Retroversion of the acetabulum causes over-coverage and restricts flexion of the femoral neck. Coxa profunda deformity (the floor of the acetabulum touches the ilio-ischial line) increases the relative depth of the acetabulum and may predispose to impingement.

2024年10月15日 · Pincer morphology refers to an over-coverage of the femoral head by the acetabulum. This over-coverage may be global (e.g. coxa profunda and protrusio acetabuli), or focal, located in the anterolateral region of the acetabular rim (e.g. acetabular retroversion and subspine impingement) .

In pincer impingement, excessive acetabular overcoverage leads to early linear contact between femoral head–neck junction and acetabular rim, resulting in labrum degeneration and significant cartilage damage.