The Prevalence of Dysplasia in Femoroacetabular Impingement

Abstract

It is unknown how often femoro-acetabular impingement (FAI) and hip dysplasia co-exist and which is more important in the development of intra-articular lesions such as labral tears. This study identified the prevalence of dysplasia on standard radiographs in a group of 76 consecutive patients with symptomatic FAI. The centre-edge (CE) angle of Wiberg, the acetabular angle (AA) of Sharp, FAI type, offset ratio and posterior wall sign were identified. 63 patients, predominantly young adult males (mean age: 34.6 years; 10:4 male-to-female ratio), met our inclusion criteria. Most females (13:18) showed signs of dysplasia based on the AA. No association of dysplasia with FAI group, offset ratio or posterior wall sign was found. 47% of our patients with FAI also had radiographic evidence of dysplasia (3-15% definite and 9-30% borderline, depending on the angle utilised). Surgery for FAI should therefore take into account the presence of co-existing dysplasia. Conversely, surgery for dysplasia should take into consideration the co-existence of FAI. The prime cause of labral pathology in the presence of dysplasia may be co-existent FAI and the latter problem may demand priority, not the former.

The John Charnley Award: Redefining the Natural History of Osteoarthritis in Patients With Hip Dysplasia and Impingement

“…We also found that patients with cam-type FAI and concomitant low lateral center-edge angles or high Tönnis angles (both representing acetabular dysplasia) were at increased risk of osteoarthritis progression. Co-occurrence of acetabular dysplasia and FAI has been documented previously with authors positing that the combination increases the risk of intraarticular pathology [2,6,11,12,16]. Tannast and colleagues [20] recently published modified reference values for acetabular overcoverage and undercoverage based on a cohort managed with hip preservation surgery, postulating that previous cutoffs may not provide optimal accuracy.…”

Prevalence of radiological femoroacetabular impingement in Japanese hip joints: detailed investigation with computed tomography

“…Meanwhile, other authors have reported that radiological FAI findings do not lead to the development of significant OA [31][32][33]. Paliobeis et al [34] emphasized that the presence of coexisting developmental dysplasia of the hip should be taken into account for the treatment of patients with FAI. The issue of whether FAI is a risk factor for the development of hip OA remains controversial.…”

Two or More Impingement and/or Instability Deformities Are Often Present in Patients With Hip Pain

“…Thus, identifying anatomic factors that compensate for or exacerbate FAI or instability is important when treating young patients with hip pain. Femoral and acetabular retroversion are known to exacerbate or contribute to impingement [16,25,28,43,48], while femoral and acetabular anteversion may exacerbate mild underlying Values are expressed as mean ± SD.…”