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orthopaedic surgery orthopedics hand maheswari shoulder joint spine bone injury to acetabulum injury journal tuberculosis foot drop gait walk acetabulum fractures thoracolumbar injuries lumbar thoracic blocks amaesthesia analgesia mbbs infections subtrochanteric fracture clavicle fracture pain entrapment nerve sites types flaps approach c spine neck pain injection arthroplasty knee slides instrument bones radiology nerve injury claw hand examination special tests osteomalacia deficiency vitamin d rickets abnormality