Are Femoroacetabular Impingement Tomographic Angles Associated with the Histological Assessment of Labral Tears? A Cadaveric Study
Authors: Ejnisman L, Domb BG, Souza F, Junqueira C, Vicente JRN, Croci AT
Journal: PLoS One. 2018 Jun 21;13(6):e0199352.
DOI: 10.1371/journal.pone.0199352 | PMID: 29928035
Background
This cadaveric study investigates the relationship between femoroacetabular impingement (FAI) radiographic angles—primarily the alpha angle and center-edge angle—and the histological presence of labral tears.
Methods
CT imaging was used to measure FAI angles in cadaver hips, followed by dissection and histological evaluation of the acetabular labrum for tears. Cam and pincer lesions were analyzed separately.
Key Findings
- Elevated alpha angles correlated with increased incidence of labral tears.
- No significant association between pincer lesions and labral tears.
- No correlation between FAI angles and Seldes labral tear classification.
Conclusions
Cam-type FAI, reflected by increased alpha angles, is a key factor in labral tear development, whereas pincer lesions show less association.
What Does This Mean for Providers?
Providers should recognize that elevated alpha angles on imaging may indicate a higher risk of labral pathology and consider this in diagnosis and treatment planning. Early identification of cam lesions could guide timely intervention to prevent progression of labral damage.