Harris systematically challenges the concept of idiopathic hip osteoarthritis using 30 years of hip radiographs. He asks whether subtle developmental abnormalities — rather than primary cartilage failure — explain most cases labeled primary OA. The focused analysis centers on 75 patients previously classified as idiopathic.
When a patient presents with hip OA and no prior diagnosis, resist the label idiopathic. Harris showed that over 90% of such cases have an identifiable developmental cause — and the diagnosis is missed primarily because clinicians look only at late-stage films.
Always seek early radiographs. OA remodeling can normalize the acetabular contour, erasing the signature of dysplasia. When early imaging is unavailable, scrutinize the subchondral bone outline on the frog lateral, ignoring osteophytes.
Use the sex and age phenotype to direct your search: a man presenting with hip OA in his late 60s or 70s warrants careful evaluation of the femoral head-neck junction for pistol grip deformity. A woman presenting before age 60 warrants CE angle measurement and assessment of acetabular depth for dysplasia.
This paper is the conceptual origin of cam-type femoroacetabular impingement as a clinical entity. Harris's pistol grip deformity. The "final common pathway" of childhood hip disease. Is exactly what Ganz and colleagues formalized as cam FAI two decades later.
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Harris systematically challenges the concept of idiopathic hip osteoarthritis using 30 years of hip radiographs. He asks whether subtle developmental abnormalities — rather than primary cartilage failure — explain most cases labeled primary OA. The focused analysis centers on 75 patients previously classified as idiopathic.
When a patient presents with hip OA and no prior diagnosis, resist the label idiopathic. Harris showed that over 90% of such cases have an identifiable developmental cause — and the diagnosis is missed primarily because clinicians look only at late-stage films.
Always seek early radiographs. OA remodeling can normalize the acetabular contour, erasing the signature of dysplasia. When early imaging is unavailable, scrutinize the subchondral bone outline on the frog lateral, ignoring osteophytes.
Use the sex and age phenotype to direct your search: a man presenting with hip OA in his late 60s or 70s warrants careful evaluation of the femoral head-neck junction for pistol grip deformity. A woman presenting before age 60 warrants CE angle measurement and assessment of acetabular depth for dysplasia.
This paper is the conceptual origin of cam-type femoroacetabular impingement as a clinical entity. Harris's pistol grip deformity. The "final common pathway" of childhood hip disease. Is exactly what Ganz and colleagues formalized as cam FAI two decades later.