Hip displacement, common in patients with cerebral palsy (CP), causes pain and hinders adequate care. Hip reconstructive surgery (HRS) is performed to treat hip displacement; however, only a few studies have quantitatively assessed femoral head sphericity after HRS. The aim of this study was to quantitatively assess improvement in hip sphericity after HRS in patients with CP. We retrospectively analyzed hip radiographs of patients who had undergone HRS because of CP-associated hip displacement. The pre- and postoperative migration percentage (MP), femoral neck-shaft angle (NSA), and sphericity, as determined by the Mose hip ratio (MHR), age at surgery, Gross Motor Function Classification System level, surgical history including Dega pelvic osteotomy, and triradiate cartilage status were studied. Regression analyses using linear mixed model were performed to identify factors affecting hip sphericity improvement.Aims
Methods
We evaluated growth and remodeling of the 21 hips after valgus osteotomy with rotational and sagittal components for hinge abduction in 21 patients (mean, 9.7 years) with Legg-Calvé-Perthes disease (LCPD) both clinically and radiologically. The type of osteotomy was determined by assessing the hinge movement three-dimensionally using preoperative gait assessment, 2-dimensional/3-dimensional computed tomography (2D/3D-CT), and intraoperative dynamic arthrography. The Iowa hip score averaged 66 (34 to 76) before operation and 92 (80 to 100) at a mean follow-up of 7.1 years (3.0 to 15.0). Radiographic measurements revealed favorable remodeling of the femoral head and improved hip joint mechanics. Valgus osteotomy with rotational and sagittal components results in sustained improvement in symptoms and functions and beneficially influences remodeling of the hip. Preoperative gait assessment, 2D/3D-CT, and intra-operative dynamic arthrography are helpful for assessing the spatial features of the femoral capital hump and for determining the optimal congruent position of the hip.
