Pincer morphology is not associated with hip osteoarthritis unless hip pain is present

OBJECTIVE: To assess the relationship between pincer morphology and radiographic hip osteoarthritis (RHOA) over 2-,5-,8- and 10-years follow-up, and to study the interaction between pincer morphology and pain.METHODS: Individuals from the prospective CHECK cohort were drawn. Anteroposterior pelvic and false profile radiographs were obtained. Hips free of definite RHOA (Kellgren and Lawrence (KL) 0 or 1) at baseline were included. Pincer morphology: lateral or anterior center edge angle, or both ≥40° at baseline. Incident RHOA: KL ≥2 or total hip replacement at follow-up. Multivariable logistic regression with generalized estimating equations estimated the associations at follow-up. Associations were expressed as unadjusted (OR) and adjusted odds ratios (aOR) with 95% confidence intervals (95% CI). An interaction term was added to investigate whether pincer morphology had a different effect on symptomatic hips.RESULTS: Incident RHOA developed in 69 hips (5%) at 2 years, 178 hips (14%) at 5 years, 279 hips (24%) at 8 years, and in 495 hips (42%) at 10 years follow-up. No significant associations were found between pincer morphology and incident RHOA (aOR's 0.35 (95% CI 0.06-2.15) -1.50 (95% CI 0.94-2.38)). Significant interactions between pain and anterior pincer morphology in predicting incident RHOA were found at 5- 8- and 10 years follow-up (ORs 1.97 (1.03-3.78) - 3.41 (1.35-8.61)).CONCLUSION: No associations were found between radiographic pincer morphology and incident RHOA at any follow-up moment. Anteriorly located pincer morphology with hip pain however was significantly associated with incident RHOA. This highlights the importance of studying symptoms and hip morphology simultaneously.</p

Pincer morphology is not associated with hip osteoarthritis unless hip pain is present

OBJECTIVE: To assess the relationship between pincer morphology and radiographic hip osteoarthritis (RHOA) over 2-,5-,8- and 10-years follow-up, and to study the interaction between pincer morphology and pain.METHODS: Individuals from the prospective CHECK cohort were drawn. Anteroposterior pelvic and false profile radiographs were obtained. Hips free of definite RHOA (Kellgren and Lawrence (KL) 0 or 1) at baseline were included. Pincer morphology: lateral or anterior center edge angle, or both ≥40° at baseline. Incident RHOA: KL ≥2 or total hip replacement at follow-up. Multivariable logistic regression with generalized estimating equations estimated the associations at follow-up. Associations were expressed as unadjusted (OR) and adjusted odds ratios (aOR) with 95% confidence intervals (95% CI). An interaction term was added to investigate whether pincer morphology had a different effect on symptomatic hips.RESULTS: Incident RHOA developed in 69 hips (5%) at 2 years, 178 hips (14%) at 5 years, 279 hips (24%) at 8 years, and in 495 hips (42%) at 10 years follow-up. No significant associations were found between pincer morphology and incident RHOA (aOR's 0.35 (95% CI 0.06-2.15) -1.50 (95% CI 0.94-2.38)). Significant interactions between pain and anterior pincer morphology in predicting incident RHOA were found at 5- 8- and 10 years follow-up (ORs 1.97 (1.03-3.78) - 3.41 (1.35-8.61)).CONCLUSION: No associations were found between radiographic pincer morphology and incident RHOA at any follow-up moment. Anteriorly located pincer morphology with hip pain however was significantly associated with incident RHOA. This highlights the importance of studying symptoms and hip morphology simultaneously.</p