Abstract
Purpose
The purpose of this study was to investigate the morphological changes of the knee in patients with untreated developmental dysplasia of the hip.
Methods
Morphological analysis of 150 knee joints in 75 patients with developmental dysplasia of the hip was performed by examining computed tomographic (CT) images. Of these patients, 36 had unilateral developmental dysplasia of the hip and 39 had bilateral developmental dysplasia of the hip. Therefore, 36 hips were normal, and 114 hips were dislocated. CT images ranged from the iliac crest to 2 cm inferior to the tibial tuberosity.
Results
Compared with the knees in patients with normal hips, the femoral condyles in patients with dislocated hips were smaller and exhibited greater medial and lateral condylar asymmetry. The anterior femoral condylar angle of the femur was increased, as was the groove angle, while the trochlear groove was shallower in patients with dislocated hips. Furthermore, the lateral patella shift was reduced and the patellar tilt angle was increased in patients with dislocated hips compared with patients with normal hips. The extent of changes in these variables differed with the degree of dislocation. However, the posterior condylar angle of the femur was not affected by the degree of dislocation.
Conclusion
These findings suggest that developmental dysplasia of the hip is associated with morphological changes in the knee joint. These changes should be considered during hip and knee surgery.
Level of evidence
Prospective study, Level II.
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Li, H., Qu, X., Wang, Y. et al. Morphological analysis of the knee joint in patients with hip dysplasia. Knee Surg Sports Traumatol Arthrosc 21, 2081–2088 (2013). https://doi.org/10.1007/s00167-012-2242-9
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DOI: https://doi.org/10.1007/s00167-012-2242-9