Coxa profunda means that your hip (acetabular) socket is deep. Until recently, findings of coxa profunda on x-rays have been considered indicative of pincer-type femoroacetabular impingement. A study presented in the American Journal of Bone and Joint Surgery hypothesized that coxa profunda is a very common radiographic finding in females and is not a finding that is specifically associated with pincer-type femoroacetabular impingement.
The researchers divided study objects into four groups of hips: those with acetabular dysplasia (fifty-eight hips), femoroacetabular impingement (fifty hips), symptomatic residual Legg-Calvé-Perthes deformities (sixteen hips), and asymptomatic hips (thirty-three). Coxa profunda was present when the floor of the acetabular fossa touched or was medial to the ilioischial line. The association between coxa profunda and hip disorder diagnosis, lateral center-edge angle, acetabular inclination, patient age, and sex was analyzed.
Coxa profunda was more common in females than males (70% compared with 24%). Acetabular overcoverage (a lateral center-edge angle of >40° or acetabular inclination of <0°) was seen in only 22% of hips with coxa profunda.
The researchers concluded that coxa profunda should be considered a normal radiographic finding, at least in females. They went on to say that coxa profunda is a nonspecific radiographic finding, seen in a variety of hip disorders and asymptomatic hips. The presence of deep sockets is neither necessary nor sufficient to support a diagnosis of pincer-type femoroacetabular impingement.
J Bone Joint Surg Am, 2013 Mar 06;95(5):417-423
Coxa Profunda Is Not a Useful Radiographic Parameter for Diagnosing Pincer-Type Femoroacetabular Impingement. Jeffrey J. Nepple, MD1; Charles L. Lehmann, MD1; James R. Ross, MD1; Perry L. Schoenecker, MD1; John C. Clohisy, MD1
1 Department of Orthopaedic Surgery, Washington University School of Medicine.