Suguru Ohsawa1,2, Syuji Koide3, Takaaki Shibuya4. 1. Department of Physical Therapy, Osaka Yukioka College of Health Science, 2-2-3 Ukita, Kita-Ku, Osaka City, Osaka, 530-0021, Japan. suguru-oosawa@yukioka.or.jp. 2. Department of Orthopaedic Surgery, Yukioka Hospital, 2-2-3 Ukita, Kita-Ku, Osaka City, Osaka, 530-0021, Japan. suguru-oosawa@yukioka.or.jp. 3. Department of Orthopaedic Surgery, Yukioka Hospital, 2-2-3 Ukita, Kita-Ku, Osaka City, Osaka, 530-0021, Japan. 4. Department of Orthopaedic Surgery, Sumitomo Hospital, 5-3-20 Nakanoshima, Kita-Ku, Osaka City, Osaka, 530-0005, Japan.
Abstract
PURPOSES: Several studies have reported no differences in outcomes between total hip arthroplasty (THA) of osteotomized hips and primary hip THA. However, our results were worse after THA for converted osteotomized hips. Therefore, this study's aim was to clarify the differences between THA after osteotomy and primary THA for osteoarthritis in developmental dysplasia of the hip (DDH). METHODS: The data were collected retrospectively (December 1998-June 2013). The cohort contained patients with a previous osteotomy (40 femur osteotomies) for osteoarthritis with DDH who then underwent cementless THA (average 192 months after osteotomy). The clinical and radiographic outcomes of 40 hips (osteotomy group) were compared with a matched group of 40 hips after primary THA (primary group). THA was performed and investigated only in patients with DDH. RESULTS: The mean follow-up period of the osteotomy group was 133 months. One patient was lost to follow-up. They had significantly higher subluxation and a narrower canal than the primary group (p < 0.0001, 0.017, respectively). Preoperative and final Harris Hip Score values were worse in the osteotomy group than in the primary group (preoperative 35 vs. 44, p = 0.0009; final 88 vs. 96, p = 0.0001, respectively). Manual muscle strengths of the hip flexor at final follow-up were worse in the osteotomy group. Radiographic outcomes of the osteotomy group showed a larger postoperative leg length discrepancy and severe periprosthetic bone atrophy as judged by bone mineral density and stress shielding. CONCLUSION: Proximal femoral osteotomies showed worse outcomes after conversion THA at mid-term follow-up.
PURPOSES: Several studies have reported no differences in outcomes between total hip arthroplasty (THA) of osteotomized hips and primary hip THA. However, our results were worse after THA for converted osteotomized hips. Therefore, this study's aim was to clarify the differences between THA after osteotomy and primary THA for osteoarthritis in developmental dysplasia of the hip (DDH). METHODS: The data were collected retrospectively (December 1998-June 2013). The cohort contained patients with a previous osteotomy (40 femur osteotomies) for osteoarthritis with DDH who then underwent cementless THA (average 192 months after osteotomy). The clinical and radiographic outcomes of 40 hips (osteotomy group) were compared with a matched group of 40 hips after primary THA (primary group). THA was performed and investigated only in patients with DDH. RESULTS: The mean follow-up period of the osteotomy group was 133 months. One patient was lost to follow-up. They had significantly higher subluxation and a narrower canal than the primary group (p < 0.0001, 0.017, respectively). Preoperative and final Harris Hip Score values were worse in the osteotomy group than in the primary group (preoperative 35 vs. 44, p = 0.0009; final 88 vs. 96, p = 0.0001, respectively). Manual muscle strengths of the hip flexor at final follow-up were worse in the osteotomy group. Radiographic outcomes of the osteotomy group showed a larger postoperative leg length discrepancy and severe periprosthetic bone atrophy as judged by bone mineral density and stress shielding. CONCLUSION: Proximal femoral osteotomies showed worse outcomes after conversion THA at mid-term follow-up.
Entities:
Keywords:
Hip; Osteoarthritis; Osteotomy; Total hip arthroplasty
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