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Review
. 2015 Jan;67(1):17-27.
doi: 10.1002/art.38887.

Femoroacetabular impingement

Stephanie Pun  1 , Deepak Kumar, Nancy E Lane
Affiliations
Review

Femoroacetabular impingement

Stephanie Pun et al. Arthritis Rheumatol. 2015 Jan.
No abstract available

PubMed Disclaimer

Figures

Fig. 1
Fig. 1
Lateral Hip Radiograph (A) 45°Dunn Lateral Hip Radiograph with alpha angle measurement. First the femoral neck axis (line connecting the center of the femoral head and the mid point of the narrowest part of the femoral neck) is defined. Next a circle is fit to the femoral head. Alpha angle is then measured as the angle between the femoral neck axis and the line from the center of the circle to the point where the bony contour first appears outside the best-fit circle, and (B) Frog Leg Lateral Radiograph
Fig. 2
Fig. 2
Acetabular measures on AP Pelvis radiographs (cropped) (A) Lateral center edge angle (LCEA), with its vertex at the center of the femoral head, and is the angle between a vertical line to the pelvis and another line that extends to the lateral extent of the acetabular roof, and (B) Tönnis angle is between a horizontal line connecting the two femoral heads and a line connecting the medial and lateral extents of the acetabular roof (C) Crossover sign in which the anterior wall projects lateral to the posterior wall before converging at the lateral acetabular sourcil,, (D) Posterior wall sign in which the posterior acetabular wall is medial to the center of the femoral head, and (E) Ischial spine sign in which the ischial spine is visible within the pelvic inlet on the AP pelvis.
Fig. 3
Fig. 3
Coronal MRI of the hip (A) labral tear, (B) Cartilage lesion, and (C) Radial reformatted MRI showing cam deformity and impingement cysts at femoral head-neck junction
Fig 4
Fig 4
Hip arthroscopy for FAI (A) Cam deformity seen during hip arthroscopy with overlying chondromalacia and asphericity of the femoral head-neck junction, and corresponding fluoroscopic image, (B) After hip arthroscopy for femoral osteochondroplasty to restore femoral head-neck offset, (C) Acetabular labrochondral separation before repair, and (D ) After arthroscopic labral repair of labrochondral separation
See this image and copyright information in PMC

References

    1. Beck M, Kalhor M, Leunig M, Ganz R. 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(7):1012–8. - PubMed
    1. Ganz R, Leunig M, Leunig-Ganz K, Harris WH. The etiology of osteoarthritis of the hip: an integrated mechanical concept. Clin Orthop Relat Res. 2008;466(2):264–72. - PMC - PubMed
    1. Ganz R, Parvizi J, Beck M, Leunig M, Notzli H, Siebenrock KA. Femoroacetabular impingement: a cause for osteoarthritis of the hip. Clin Orthop Relat Res. 2003;(417):112–20. - PubMed
    1. Anderson SE, Siebenrock KA, Tannast M. Femoroacetabular impingement: evidence of an established hip abnormality. Radiology. 2010;257(1):8–13. - PubMed
    1. Domayer SE, Ziebarth K, Chan J, Bixby S, Mamisch TC, Kim YJ. Femoroacetabular cam-type impingement: diagnostic sensitivity and specificity of radiographic views compared to radial MRI. Eur J Radiol. 2011;80(3):805–10. - PubMed

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