Short-Term Functional Outcomes and Zero Dislocation with Dual-Mobility Cups in Primary Total Hip Arthroplasty: A Single-Surgeon Case Series in Young High-Risk Indian Patients

Abstract

Background: Dislocation is a leading cause of early revision after primary total hip replacement (THR), particularly in young high-risk patients from high-demand settings like India where extreme hip motions are common. Dual-mobility (DM) cups may mitigate this risk, but data on short-term outcomes in young Indian cohorts remain limited Methods: We conducted a retrospective single-surgeon case series of 35 consecutive primary THRs using cementless DM cups at a tertiary centre in New Delhi, India. Inclusion criteria were elective primary THR for non-oncological indications with minimum one-year follow-up. Patients (mean age 45.8 ± 12.7 years; 20 males) had avascular necrosis (n=18), secondary osteoarthritis (n=14), or fracture neck femur (n=3). Outcomes included Harris Hip Score (HHS), complications, and radiographic parameters (acetabular inclination, loosening). Descriptive statistics were used. Results: At mean follow-up of 12 ± 2 months, mean HHS improved from 45 ± 7 preoperatively to 88 ± 7. All patients were ambulatory and pain-free. Radiographically, mean acetabular inclination was 44.7° ± 10.6° (all within Lewinnek safe zone); no radiolucent lines, migration, or limb-length discrepancy >1 cm occurred. No dislocations, infections, aseptic loosening, or mechanical failures were recorded despite recognised instability risk factors. Conclusions: Dual-mobility cups in primary THR for young high-risk Indian patients provided excellent short-term functional recovery and zero dislocation at one year, supporting their use in this demanding cohort when precise component positioning is achieved. Key words: Dual Mobility Cup; Total Hip Arthroplasty; Harris Hip Score; Dislocation; Avascular Necrosis; Orthopedic Procedures.