Wei Chai1,2,3, Chi Xu1,2,3, Ren-Wen Guo1, Pei-Fu Tang4,5,6,7, Ji-Ying Chen8,9,10,11, Xiang-Peng Kong1,2,3, Jun Fu1,2,3. 1. Senior Department of Orthopedics, the Fourth Medical Center of Chinese PLA General Hospital, Beijing, China. 2. National Clinical Research Center for Orthopedics, Sports Medicine & Rehabilitation, Beijing, China. 3. Department of Orthopedics, the First Medical Center of Chinese PLA General Hospital, Beijing, China. 4. Senior Department of Orthopedics, the Fourth Medical Center of Chinese PLA General Hospital, Beijing, China. Pftang301@163.com. 5. National Clinical Research Center for Orthopedics, Sports Medicine & Rehabilitation, Beijing, China. Pftang301@163.com. 6. Department of Orthopedics, the First Medical Center of Chinese PLA General Hospital, Beijing, China. Pftang301@163.com. 7. Department of Orthopaedics, General Hospital of People's Liberation Army, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China. Pftang301@163.com. 8. Senior Department of Orthopedics, the Fourth Medical Center of Chinese PLA General Hospital, Beijing, China. Chenjiying_301@163.com. 9. National Clinical Research Center for Orthopedics, Sports Medicine & Rehabilitation, Beijing, China. Chenjiying_301@163.com. 10. Department of Orthopedics, the First Medical Center of Chinese PLA General Hospital, Beijing, China. Chenjiying_301@163.com. 11. Department of Orthopaedics, General Hospital of People's Liberation Army, No. 28 Fuxing Road, Haidian District, Beijing, 100853, China. Chenjiying_301@163.com.
Abstract
AIMS: Total hip arthroplasty (THA) in patients with hip-dislocation dysplasia remains challenging. This study aims to evaluate whether these patients may benefit from robotic-assisted techniques. METHODS: We reviewed 135 THAs (108 conventional THAs and 27 robotic-assisted THAs) for Crowe type III or IV from January 2017 to August 2019 in our institution. Robotic-assisted THAs were matched with conventional THAs at a 1:1 ratio (27 hips each group) using propensity score matching. The accuracy of cup positioning and clinical outcomes were compared between groups. RESULTS: The inclination of the cup for conventional THAs and robotic THAs was 42.1 ± 5.7 and 41.3 ± 4.6 (p = 0.574), respectively. The anteversion of the cup for conventional THAs was significantly greater than that of robotic THAs (29.5 ± 8.1 and 18.0 ± 4.6; p < 0.001), respectively. The ratio of the acetabular cup in the Lewinnek safe zone was 37% (10/27) in conventional THAs and 96.3% (26/27) in robotic THAs (p < 0.001). Robotic THAs did not achieve better leg length discrepancy than that of conventional THAs (- 0.4 ± 10.9 mm vs. 0.4 ± 8.8 mm, p = 0.774). There was no difference in Harris Hip Score and WOMAC Osteoarthritis index between groups at the 2-year follow-up. No dislocation occurred in all cases at the final follow-up. CONCLUSION: Robotic-assisted THA for patients with high dislocation improves the accuracy of the implantation of the acetabular component with respect to safe zone.
AIMS: Total hip arthroplasty (THA) in patients with hip-dislocation dysplasia remains challenging. This study aims to evaluate whether these patients may benefit from robotic-assisted techniques. METHODS: We reviewed 135 THAs (108 conventional THAs and 27 robotic-assisted THAs) for Crowe type III or IV from January 2017 to August 2019 in our institution. Robotic-assisted THAs were matched with conventional THAs at a 1:1 ratio (27 hips each group) using propensity score matching. The accuracy of cup positioning and clinical outcomes were compared between groups. RESULTS: The inclination of the cup for conventional THAs and robotic THAs was 42.1 ± 5.7 and 41.3 ± 4.6 (p = 0.574), respectively. The anteversion of the cup for conventional THAs was significantly greater than that of robotic THAs (29.5 ± 8.1 and 18.0 ± 4.6; p < 0.001), respectively. The ratio of the acetabular cup in the Lewinnek safe zone was 37% (10/27) in conventional THAs and 96.3% (26/27) in robotic THAs (p < 0.001). Robotic THAs did not achieve better leg length discrepancy than that of conventional THAs (- 0.4 ± 10.9 mm vs. 0.4 ± 8.8 mm, p = 0.774). There was no difference in Harris Hip Score and WOMAC Osteoarthritis index between groups at the 2-year follow-up. No dislocation occurred in all cases at the final follow-up. CONCLUSION: Robotic-assisted THA for patients with high dislocation improves the accuracy of the implantation of the acetabular component with respect to safe zone.
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