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In younger patients during total hip arthroplasty (THA), the presence of morphologic deformities, previous surgeries, and retained hardware, can pose technical challenges making reconstruction difficult. The purpose of our study is to assess the outcome of robotic-assisted THA compared to conventional THA in patients younger than 35 years old. METHODS: A retrospective analysis of 123 patients younger than 35 years old who underwent primary unilateral THA between January 2013 and April 2018 was conducted. Patients were divided into two cohorts: (1) robotic-assisted THA (r-THA) and (2) conventional-THA (c-THA). Demographics, operative details, and post-operative outcomes were carefully studied. Radiographic analysis included measurement of postoperative acetabular anteversion and inclination angles as well as perioperative leg length discrepancies. RESULTS: Of the total 123 patients, 30 patients (32 hips) were in the robotic-THA cohort, and 93 patients (100 hips) were in the c-THA cohort. Patients in the r-THA cohort were younger (26.6±6.2 vs. 29.0±5.3; p=0.03) and had a higher mean BMI (29.8±8.2 vs. 25.7±5.9; p=0.03) at surgery. The most common indications for THA were DDH and osteonecrosis. The acetabular component was positioned within Lewinnek’s safe zone more often in the r-THA cohort compared to the c-THA cohort (94% vs 65%; p<0.01). Patients in the c-THA group were more likely to experience clinically significant higher Health Sciences EPiC Series in Health Sciences Volume 3, 2019, Pages 282–288 CAOS 2019. The 19th Annual Meeting of the International Society for Computer Assisted Orthopaedic Surgery P. Meere and F. Rodriguez Y Baena (eds.), CAOS 2019 (EPiC Series in Health Sciences, vol. 3), pp. 282–288 rates of dislocation (2.9% vs. 0), revision (6.8%), any postoperative complication (7.8%), and 90-day readmission (2.9) following THA. CONCLUSION: Robotic THA can help improve outcomes in younger THA recipients. Future studies with larger cohorts and longer follow-up times should evaluate outcomes in this historically technically demanding patient population.

Robotic-assisted Total Hip Arthroplasty May Reduce the Risk of Complications in Patients Younger than 35