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ortho spine orthopaedics paediatrics hip wellness joint replacement ao trauma spine fusion surgery osteoporosis bone health joint biomechanics knee ankle vitamin d total hip replacement embryology shoulder disesae gait limb length spondylolisthesis tendon torticollis subaxial spine axis atlas fractures neck cercical spine interbody fusion plf olif xlif llif alif plif tlif lumbar spine clinical examination drugs pharmacology spine fixation pedicle screws fracture fixation bone plates degenerative skeletal dysplasia