Early results of primary total hip arthroplasty performed in young adults at a regional Saudi-Arabian orthopedics center: a prospective observational study

Background. Younger patients undergoing primary total hip arthroplasty (THA) have different indications and outcomes than elderly patients. Furthermore, studies reporting the results of THA in young patients are scarce in our area. The aim of the study is to report the early experience and clinical results after total hip arthroplasty in patients ≤40 years old from a regional Saudi-Arabian hospital as a representative of the Arab (Middle Eastern) population. Methods. We conducted a prospective observational study over one year by following all patients (≤40 years) who underwent primary THA at a regional Saudi-Arabin orthopedics center. Twenty-five patients (a mean age of 31.60±6.07 years, and 14 (56%) were males) were eligible for final inclusion. The functional assessment was performed according to the Harris Hip Score (HHS), leg length discrepancy (LLD) was evaluated, and complications at any point were reported. Results. The commonest indication was advanced avascular necrosis (28%) followed by post-traumatic osteoarthritis (24%) and rheumatoid arthritis (24%). Cementless fixation was utilized in 20 (80%) THAs, and the bearing surface was either metal- or ceramic-on-polyethylene in 92% of THAs. After a mean follow up of 20.0±4.5 months, HHS improved from a pre-operative mean of 29.20±5.29 to 85.48±7.18 (p = 0.0001). Excellent and good results were reported in 84%. All working patients (52%) returned to their jobs after THAs. The leg length discrepancy improved significantly from a pre-operative mean of 2.12±1.01 cm to the last follow up mean of 0.72±0.4 cm, p = 0.0001. Two (8%) patients had superficial wound infections at the time of suture removal, which were treated successfully by daily dressing and antibiotics. None required revision. Conclusions. Primary total hip arthroplasty is the option for managing end-stage hip disease, even in younger patients when hip preservation surgeries are invalid. Our results showed improved functional outcomes and a return to pre-disease daily activities in most patients, with considerably lower complication incidence.