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- Title
Femoral head-neck offset measurements in 339 subjects: distribution and implications for femoroacetabular impingement.
- Authors
Fraitzl, Christian; Kappe, Thomas; Pennekamp, Friederike; Reichel, Heiko; Billich, Christian
- Abstract
Purpose: The α-angle is a frequently used measurement to quantify head-neck offset pathology in cam-type femoroacetabular impingement. However, diverging norm values and reference intervals have been described, especially in men. Methods: The α-angle, the head-neck offset ratio and the triangular index were measured on anteroposterior and lateral radiographs of 339 (170 men and 169 women) subjects without evident underlying hip pathology. Results: For male subjects, the mean α-angle was 49.4° (SD 10.5°) on anteroposterior and 49.1° (SD 10.6°) on lateral radiographs, whereas for female subjects, it was 45.0° (SD 8.0°) and 46.1° (SD 9.9°), respectively. Thus, calculated upper limits of reference intervals in the population screened were 70° for both radiographic projections in men and 61° (anteroposterior) and 66° (lateral) in women. Conclusion: These data substantiate recent findings that the pathological threshold of the α-angle in male subjects may be lower than that previously assumed. Level of evidence: Diagnostic, Level III.
- Subjects
FEMUR; HEAD; NECK; RADIOGRAPHY; DIAGNOSIS
- Publication
Knee Surgery, Sports Traumatology, Arthroscopy, 2013, Vol 21, Issue 5, p1212
- ISSN
0942-2056
- Publication type
Article
- DOI
10.1007/s00167-012-2042-2