The Impact of Spinal Fusion on Hip Displacement in Cerebral Palsy
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ORIGINAL ARTICLE
The Impact of Spinal Fusion on Hip Displacement in Cerebral Palsy Mutlu Cobanoglu1,2 · Brian Po‑Jung Chen1,3 · Lucio Perotti1,4 · Kenneth Rogers1 · Freeman Miller1 Received: 4 June 2020 / Accepted: 23 September 2020 © Indian Orthopaedics Association 2020
Abstract Background and study aims The aims of this study were to determine the risk of progressive hip subluxation in children with CP after spinal fusion for scoliosis and how frequent the hips follow-up should be scheduled. Patients and methods Pelvis radiography [migration index (MI) and pelvic obliquity (PO)] of Gross Motor Function Classification System (GMFCS) levels IV and V children with CP who received spinal fusion and pelvic fixation were reviewed retrospectively. This population was categorized into three groups based on the MI at spinal fusion: G1 = 0–29%; G2 = 30–59%; and G3 = 60–100%. Results Fifty children (age 7.5–15.0 years) and categorized into 3 groups (G1 = 19, G2 = 23, G3 = 8; 100 hips in total). Preoperative and last follow-up MI were 22 ± 7% and 30 ± 20% (G1), 41 ± 9% and 43 ± 22% (G2), 92 ± 15% and 97 ± 10% (G3). The MIs at spinal fusion between groups were statistically different (p
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