SUMMARY
Introduction. Age is one of the major biological and clinical determinants affecting the outcomes of total hip arthroplasty (THA) in patients with dysplastic coxarthrosis. With increasing age, cartilage elasticity, muscle tone, and regenerative capacity decline, potentially slowing rehabilitation. However, modern surgical techniques and cementless implants have significantly minimized the impact of age-related differences on postoperative results. Objective: To comparatively evaluate the effect of age groups (≤60 and >60 years) on postoperative outcomes of total hip arthroplasty in dysplastic coxarthrosis patients in terms of range of motion (ROM), clinical-functional parameters (Harris Hip Score, WOMAC, Merle d’Aubigné–Postel), and quality of life (SF-36). Material and Methods. This prospective analytical study included 129 patients (135 hips). Assessments were conducted preoperatively (Pre-op) and at 12 months postoperatively (Post-op) using goniometric measurements, Harris Hip Score, WOMAC, Merle d’Aubigné–Postel, and SF-36 scales. Statistical analyses were performed in SPSS 22.0 using Kruskal–Wallis, Wilcoxon, and χ² tests with Bonferroni correction. Results. Significant clinical improvement was observed in all parameters in both age groups after surgery. ROM increased from 9.6 to 16.6 points (≤60 years), Harris score improved from 43.1 to 84.0, WOMAC index decreased by 80–85%, and SF-36 physical and mental component scores rose from 38 to 68 and 45 to 73, respectively. Flexion angle showed approximately 80% improvement. Although outcomes were slightly lower in the older group, the differences were not statistically significant (p>0.05). No statistically significant differences were found concerning heterotopic ossification, sex, or Crowe type. Conclusion. Age does not have a statistically significant impact on total hip arthroplasty outcomes in dysplastic coxarthrosis. Both age groups achieved substantial clinical and functional recovery. Chronological age should not be considered a limiting factor; surgical indications should be based on overall functional status, bone quality, and rehabilitation potential.
Keywords: dysplastic coxarthrosis, total hip arthroplasty, range of motion, Harris hip score, WOMAC index

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