Abstract
Purpose
In the present study, we aimed to evaluate the affect of the variations in hip anatomy and pelvic geometry on the severity of knee OA.
Methods
Idiopathic knee OA patients fulfilling the clinical criteria of American College of Rheumatology for OA were enrolled in the study. Several measurements regarding the hip and pelvis were performed on pelvic radiographs. Each knee was graded according to the Kellgren and Lawrence (KL) radiographic system (0–4) along with a categorization in accordance with the medial tibiofemoral joint space widths (JSW).
Results
The study group consisted of 111 subjects. The inner and outer pelvic diameters were getting wider as the JSW grade increased. Likewise, among the hip measurements, femoral head, neck and shaft diameters and hip axis lengths were linked with KL grade. There were significant differences in neck-shaft angle (NSA) between groups of JSW with a highest NSA in JSW grade 3. The optimal cut-off value for NSA in predicting the severity of knee OA was 134.4°. Furthermore, NSA beyond 134.4° was found to increase the risk of severe knee OA eightfold.
Conclusions
Variations in pelvic geometry and hip anatomy are associated with the severity of knee OA. People with NSA of above 134.4° have eightfold increased risk of developing severe knee OA. Pelvic radiographies could be evaluated at younger ages—particularly in people with high genetic predispositions—to identify the individuals at high risk and in turn, to tailor the preventive measures to these subjects.
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Acknowledgments
This study was funded by the Research Fund of the Cukurova University which had no involvement in the design, execution, or reporting of the study (Project No. TF2008LTP6).
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The authors declare that they have no conflict of interest.
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Coskun Benlidayi, I., Guzel, R., Basaran, S. et al. Is coxa valga a predictor for the severity of knee osteoarthritis? A cross-sectional study. Surg Radiol Anat 37, 369–376 (2015). https://doi.org/10.1007/s00276-014-1359-6
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DOI: https://doi.org/10.1007/s00276-014-1359-6