Cam and Pincer Femoroacetabular Impingement: Characteristic MR Arthrographic Findings in 50 Patients
Top Cited Papers
- 1 September 2006
- journal article
- Published by Radiological Society of North America (RSNA) in Radiology
- Vol. 240 (3), 778-785
- https://doi.org/10.1148/radiol.2403050767
Abstract
To retrospectively characterize magnetic resonance (MR) arthrographic findings in patients with cam femoroacetabular impingement (FAI) and in those with pincer FAI. Institutional review board approval and informed consent were not required. MR arthrographic studies obtained in 50 consecutive patients (30 men, 20 women; mean age, 28.8 years) with FAI were analyzed for labral abnormalities, cartilage lesions, and osseous abnormalities of the acetabular rim. The nonspherical shape of the femoral head at the head-neck junction was measured in eight positions around the femoral head and neck and used to calculate the alpha angle. Acetabular depth was measured. Surgical diagnosis served as the reference standard. The Wilcoxon rank sum test was used for statistical analysis. At surgery, hips in 33 patients were classified as having cam FAI and hips in 17 patients were classified as having pincer FAI. In both groups, the mean age of patients was 28.8 years. There were significantly more men (n = 27) with cam FAI and more women (n = 14) with pincer FAI. The alpha angle was significantly larger in patients with cam FAI at the anterior and anterosuperior positions. The acetabulum was significantly deeper in patients with pincer FAI than in patients with cam FAI. Cartilage lesions at the anterosuperior and superior positions were significantly larger in patients with cam FAI than in patients with pincer FAI. Cartilage lesions at the posteroinferior position were significantly larger and labral lesions at the posterior and posteroinferior positions were more pronounced in patients with pincer FAI than in patients with cam FAI. Osseous abnormalities were not significantly different between the groups. Osseous bump formation at the femoral neck was significantly more common in patients with cam FAI than in patients with pincer FAI. Characteristic MR arthrographic findings of cam FAI include large alpha angles and cartilage lesions at the anterosuperior position and osseous bump formation at the femoral neck; characteristic findings of pincer FAI include a deep acetabulum and posteroinferior cartilage lesions.Keywords
This publication has 24 references indexed in Scilit:
- MR Arthrography of the Hip: Diagnostic Performance of a Dedicated Water-Excitation 3D Double-Echo Steady-State Sequence to Detect Cartilage LesionsAmerican Journal of Roentgenology, 2004
- Debridement of the Adult Hip for Femoroacetabular ImpingementPublished by Ovid Technologies (Wolters Kluwer Health) ,2004
- Osseous Abnormalities and Early OsteoarthritisPublished by Ovid Technologies (Wolters Kluwer Health) ,2004
- Femoroacetabular impingement caused by a femoral osseous head–neck bump deformity: clinical, radiological, and experimental resultsJournal of Orthopaedic Science, 2004
- Anterior Femoroacetabular ImpingementPublished by Ovid Technologies (Wolters Kluwer Health) ,2004
- Anterior Femoroacetabular ImpingementPublished by Ovid Technologies (Wolters Kluwer Health) ,2004
- The contour of the femoral head-neck junction as a predictor for the risk of anterior impingementThe Journal of Bone and Joint Surgery, 2002
- Surgical dislocation of the adult hipThe Journal of Bone and Joint Surgery, 2001
- MR arthrography of the adult acetabular capsular-labral complex: correlation with surgery and anatomy.American Journal of Roentgenology, 1999
- MR arthrography of the hip: improved imaging of the acetabular labrum with histologic correlation in cadavers.American Journal of Roentgenology, 1995