Hip, orthopedic, app, dysplasia ,biomechanic, load, pressure, x-ray, measurement weight, bearing, surface, calculation, osteotomy, vector , periacetabular Perthes percentage Pedicle pelvic Radiography Radiological Biomechanics i-pad apple store biomechanic Acetabular acetabulum angle dislocation Down’s dysplasia dysplastic hip i-phone infant index ,itunes , joint, labrum, arthritis , Apps application arthroplasty child children congruity coxa DDH developmental, x-rays, X-Ray zone ,varus, valgus triradiate treatment Tönnis surface Leg luxation orthopractis osteotomy ossification osteoarthritis outcome pressure vector orthopaedic subluxation syndrome width weight-bearing apple app cartilage development incongruent Instability total hip arthroplasty dislocation roof Trunk sourcil slope,Hip  Value dysplasia, Radiological, radiography, X-Ray, measurement, classification,Acetabular, index, AI, angle, DDH, hip, app, orthopaedic, measure, radiographic, developmental, angle, index, Smartphone,