Adolescents with altered capital femoral physis had increased risk of femoroacetabular impingement
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PHOENIX — Adolescent athletes with a smaller tubercle and larger fossa may experience physeal instability which could lead to cam-type femoroacetabular impingement, according to results presented at the Orthopaedic Research Society Annual Meeting.
Shayan Hosseinzadeh, MD, and colleagues used CT scans of 22 patients 8 to 15 years old with confirmed femoroacetabular impingement and of 80 patients who had normal asymptomatic hips to generate 3D models of the proximal femur with separate models for the epiphysis and metaphysis. Researchers quantified the size of the epiphyseal tubercle, peripheral cupping and metaphyseal fossa using the 3D models and compared the calculated anatomical variables between the control group and femoroacetabular impingement group after adjusting for age and sex.
Results showed an association between older age and decreased tubercle height in the femoroacetabular impingement group, as well as a shallower metaphyseal fossa among female vs. male patients. Compared with normal controls, researchers found larger peripheral cupping in the anterior, posterior, superior and inferior regions among patients in the femoroacetabular impingement group after adjusting for age and sex. Patients in both the femoroacetabular impingement and normal cohorts experienced an association between increased epiphyseal tubercle base area with increased metaphyseal fossa surface area, according to results.
“We found that epiphyseal height and length were significantly smaller in the [femoroacetabular impingement] FAI group,” Hosseinzadeh said in his presentation here. “Metaphyseal fossa depth, length and width were larger and peripheral cupping were also larger across different regions compared to the normal controls.” – by Casey Tingle
Reference:
Hosseinzadeh S, et al. Paper 157. Presented at: Orthopaedic Research Society Annual Meeting; Feb. 8-11, 2020; Phoenix.
Disclosure: Hosseinzadeh reports no relevant financial disclosures.
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Hosseinzadeh S, et al. Paper 157. Presented at: Orthopaedic Research Society Annual Meeting; Feb. 8-11, 2020; Phoenix.
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