Retrospective analysis of 5-year survivorship of Dual Mobility Total Hip Arthroplasty

Abstract Background The concept of Dual Mobility (DM) Total Hip Arthroplasty (THA) has been introduced to improve the range of motion in the post-operative hips. However, literature on the mid-term and long-term outcomes of DM-THA are relatively lacking. Question / Purpose What are the mid-term results (minimum 5 years post-operatively) of DM THA surgeries done for various indications? Patients and Methods We recruited sixty participants over a period of one year who underwent DM THA surgeries. The clinical outcomes were evaluated using the Harris’ Hip Score (HHS) and the Oxford Hip Score (OHS). The participant subjective assessment of the post-operative condition was classified into excellent, good, and fair. Adverse events were recorded. The radiological outcomes were evaluated using the Moore’s criteria of osteointegration (MCO). The scores were determined for the various age groups and participant perceptions, and compared using the one-way Analysis of Variance (ANOVA). Results The mean age of our participants was 65.77 ± 10.13 years. Thirty-six participants reported excellent subjective post-operative outcomes. The mean values for HHS, OHS, and MCO were found to be 87.38 ± 4.41, 37.35 ± 4.60, and 3.10 ± 0.47 respectively. The HHS, OHS, and MCO were significantly better in participants who subjectively reported excellent outcomes (p < 0.001 each). The MCO was also significantly lesser with increasing age (p = 0.020). Two of our study participants experienced persistent thigh pain, while heterotrophic calcification, aseptic loosening of the hip joint prosthesis, and revision THR (at six years post-operatively) were observed in one participant each. Conclusion We observed reasonably good clinical and radiological outcomes in our study, with most of the study participants reporting their post-operative condition to be excellent. The HHS, OHS, and MCO correlated with the participant’s subjective perceptions. The overall incidence of complications was found to be low in our study. Level of evidence Level II