MOVE-HIP: Ceramic Hip Resurfacing Versus Total Hip Arthroplasty Using Activity Monitoring

Inclusion Criteria: * Adults aged 18 years or older. * Symptomatic hip osteoarthritis for which primary hip arthroplasty is indicated according to routine clinical practice. * Considered suitable for both ceramic hip resurfacing arthroplasty and uncemented total hip arthroplasty by the treating surgeon. * Ability and willingness to comply with study procedures, including patient-reported outcome measures, radiographs, registry linkage, and repeated wearable monitoring. * Provision of written informed consent. Exclusion Criteria: * Anatomical or pathological conditions that clearly preclude hip resurfacing arthroplasty or total hip arthroplasty, including severe deformity requiring non-standard implants or techniques. * Insufficient femoral head or acetabular bone quality, including large or multiple cysts, advanced femoral head necrosis, severe osteopenia, or osteoporosis where this would contraindicate hip resurfacing arthroplasty. * Body mass index greater than 40 kg/m\^2. * Requirement for specialized implants outside routine study procedures. * Medical comorbidity rendering the patient unfit for surgery. * Cognitive impairment, severe psychiatric disease, alcohol or substance abuse, language barrier, or other reason judged to prevent informed consent or compliance with follow-up. * Inability to complete patient-reported outcome measures or to participate in wearable monitoring.