Hip xray normal4/9/2024 Relationship of ilioischial line with acetabular floor vs. % of femoral head not covered by acetabulum Lateral center-edge angle/angle of wibergĪngle between vertical line through femoral head + line along lateral acetabulumĪssesses superolateral coverage: dysplasia 40 ° Line along inferior ischial tuberosity + line along superior aspect of lesser trochanterĪngle between femoral neck + femoral shaft demonstration of bullet sign = superimposition of ischial tuberosity.too much ER leads to nonvisualization of lesser trochanter.visualization of greater trochanters in profile.symmetrical obturator foramen + iliac wing concavity.no overhang of greater trochanter over posterior margin. no obstructing soft tissue artifact via adequate elevation of contralateral leg.increased cephalad angle leads to increased visualization of greater trochanter off femoral neck but will distort/elongate femoral neck.useful for determining anterior center-edge angle.demonstrates anterior acetabular coverage of femoral head.provides true lateral projection of femoral head/neck and oblique view of acetabulum.useful as alternative to frog leg view, as it is technically easier to obtain.useful for confirming epiphysiolysis, SCFE, Perthes disease.better demonstrates shape of femoral head + head/neck transition.useful for confirming femoroacetabular impingement (alpha angle).better demonstrates relationship of femoral head with acetabulum.useful in trauma patients where positioning is limited by pain.Hip extended + pelvis ER 65° toward ipsilateral side TKA Postoperative Rehabilitation & Outpatient ManagementĬontralateral hip flexed 90° + ipsilateral hip IR 15-20 ° THA Pseudotumor (Metal on Metal Reactions) Idiopathic Transient Osteoporosis of the Hip (ITOH)
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