Abstract
The aim of our study was to analyze the imaging findings of femoroacetabular impingement
(FAI). Eight consecutive patients [age range, 19–46 years (mean, 28.6 years); M/F
ratio=7:1] who underwent operation for FAI were analyzed. We analyzed bump, acetabular
retroversion and protrusion, and osteoarthritis in the radiographs. In MR arthrography,
we analyzed α-angle, anterolateral labral tear, cartilage abnormality, herniation
pit, paralabral cyst, subchondral cyst, and marrow edema. We correlated the imaging
findings with operative findings. In the radiographs, all eight patients showed bump
and osteoarthritis (Kellgren–Lawrence score II–IV), and five (62.5%) patients showed
acetabular retroversion. In MR arthrography, anterolateral labral tear and mild cartilage
abnormality (Outerbridge grade I and II) were seen in all eight patients; increased
α-angle was seen in six cases (75%). Anterolateral labral tear, bump, and mild cartilage
abnormality were seen in all eight patients during operation. According to the above
findings, we divided the patients into three cam-type and five mixed-type FAI. In
the five mixed-type FAI, both bump and acetabular retroversion were seen. The mixed-type
FAI is the most prevalent type in our study. The main imaging findings of mixed-type
FAI were acetabular retroversion, bump, and early osteoarthritis in radiographs, and
anterolateral labral tear, cartilage abnormality, and increased α-angle in MR arthrography.
Keywords
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References
- The painful hip: new concepts.Skeletal Radiol. 2006; 35: 352-370
- MR imaging of femoroacetabular impingement.Magn Reson Imaging Clin N Am. 2005; 13: 653-664
- Femoroacetabular impingement: a cause for osteoarthritis of the hip.Clin Orthop Relat Res. 2003; : 112-120
- Osseous abnormalities and early osteoarthritis: the role of hip impingement.Clin Orthop Relat Res. 2004; : 170-177
- Cam and pincer femoroacetabular impingement: characteristic MR arthrographic findings in 50 patients.Radiology. 2006; 240: 778-785
- MRI findings of femoroacetabular impingement.AJR Am J Roentgenol. 2006; 187: 1412-1419
- Triad of MR arthrographic findings in patients with cam-type femoroacetabular impingement.Radiology. 2005; 236: 588-592
- Fibrocystic changes at anterosuperior femoral neck: prevalence in hips with femoroacetabular impingement.Radiology. 2005; 236: 237-246
- Radiological assessment of osteo-arthrosis.Ann Rheum Dis. 1957; 16: 494-502
- The contour of the femoral head–neck junction as a predictor for the risk of anterior impingement.J Bone Joint Surg Br. 2002; 84: 556-560
- The etiology of chondromalacia patellae. 1961.Clin Orthop Relat Res. 2001; 389: 5-8
- Anterior femoroacetabular impingement. Part I. Techniques of joint preserving surgery.Clin Orthop Relat Res. 2004; 418: 61-66
- Current concepts in the management of femoroacetabular impingement.J Bone Joint Surg Br. 2005; 87: 1459-1462
- Imaging findings of femoroacetabular impingement syndrome.Skeletal Radiol. 2005; 34: 691-701
- Hip morphology influences the pattern of damage to the acetabular cartilage: femoroacetabular impingement as a cause of early osteoarthritis of the hip.J Bone Joint Surg Br. 2005; 87: 1012-1018
Article info
Publication history
Published online: June 22, 2009
Accepted:
April 7,
2009
Received:
August 20,
2008
Identification
Copyright
© 2010 Elsevier Inc. Published by Elsevier Inc. All rights reserved.
