2024年5月7日 · The alpha angle is a radiological measurement proposed for the detection of cam morphology, which is sometimes associated with femoroacetabular impingement (FAI). The term alpha angle is also used in a separate and unrelated context in the evaluation of developmental dysplasia of the hip (DDH) in children.

2025年1月22日 · Femoroacetabular impingement (FAI) is the abnormal contact between the femur and acetabulum which may lead to labral damage, various degrees of chondral injury and progressive hip pain. Diagnosis is made radiographically with hip radiographs showing an aspherical femoral (Cam impingement) or anterosuperior acetabular overhang (Pincer ...

The alpha angle is the most widely used (abnormal > 55 degrees), indicating the angle at which the femoral head departs from its normal spherical outline. Femoral head-neck offset distance (abnormal < 8 mm) and associated ratios can also be used to demonstrate a …

2023年4月24日 · The alpha angle is a measurement used in the ultrasonographic assessment of developmental dysplasia of the hip (DDH). The term alpha angle is also used in a separate and unrelated context in the evaluation of femoroacetabular impingement.

The alpha angle value measured in an oblique CT reconstruction of the femoral neck has a high discriminating capacity for the diagnosis of symptomatic cam-type FAI. If a patient complains of hip pain and an alpha angle of 57° is found in CT, strongly suggest that cam impingement is causing the pain. ACKNOWLEDGEMENTS

Femoroacetabular impingement syndrome (FAIS) is a motion-related disorder of the hip caused by a premature contact between the proximal femur and acetabulum. 17, 43 FAIS can be diagnosed by the presence of hip pain, a clinical sign suggestive of FAIS during hip examination, and imaging findings.

2012年11月23日 · One of the criteria of the cam type of femoroacetabular impingement is femoral head–neck dysplasia, denoted mathematically as the “alpha angle.” Several observers have reported that direct measurement of the angle may not be necessary because subjective appraisal may yield similar results.

2014年2月1日 · Cam impingement is characterized by abnormal contact between the proximal femur and acetabulum caused by a non-spherical femoral head, known as a cam deformity. A cam deformity is usually quantified by the alpha angle; greater alpha angles substantially increase the risk for osteoarthritis (OA).

To calculate the alpha angle first find the center of the epiphysis then track axis through femoral neck to the center of the epiphysis, and then the circumference of the curvature radius at the point where the epiphysis profile moves away from the circle to become neck. Alpha angle in the normal hip is < 50°.

Hip impingement tests usually reproduce the patient's typical pain. There is often a limited range of hip motion, typically restricted internal rotation in flexion, especially if you compare to the contralateral side. ... Alpha angle measurement The normal hip shows an alpha-angle far below 60º. The hip with the Cam morphology has an alpha ...