Evaluation of effectiveness of pain control in patients after total hip replacement using the anaesthetic continuous-infusion device with bupivacaine

INTERVENTION: Group I (25 patients): ACID intra‐articular (above lessor trochanter) and normal saline 100 ml Group II (25 patients): ACID inter‐muscular (between tensor facia lata and gluteal medius) and normal saline 100 ml Group III (25 patients): ACID intra‐articular (above lessor trochanter) and bupivacaine 0.5% 100 ml Group IV (25 patients): ACID intra‐articular (between tensor facia lata and gluteal medius) and bupivacaine 0.5%100 ml CONDITION: Osteoarthritic hip ; Musculoskeletal Diseases ; Arthropathies PRIMARY OUTCOME: Pain control SECONDARY OUTCOME: Improve post‐operative hip function and rehabilitation programs INCLUSION CRITERIA: Consecutive 100 patients with indications for total hip replacement.