In stable non-cemented hip arthroplasties lucent zones at the metal-bone interface do occur, as it usually is a combination of bone ingrowth and fibrous tissue ingrowth, that provides the fixation in most cases. The distal part of the femoral prosthesis is not 'loaded', so there will be no distal stress loading. In an effort to avoid these changes, most modern cementless prosthesis only have fixation proximally, so you usually will not find proximal stress shielding. Stress loading distally may result in cortical thickening and bridging sclerosis at the tip of the prosthesis ( called pedestal). Stress shielding proximally may result in proximal osteoporosis and calcar resorption. The implantation of a bone ingrowth prosthesis results in altered stress distribution to the native bone, especially in the older models with non tapered and fully coated femoral stems. Rare complications include bowel fistulas, encasement of neurovascular structures and bladder wall burn. This defect is filled with bone chips, cement or bone transplant.Ĭement extrusion is usually asymptomatic. When the acetabulum is prepared for placement of the cup a perforation may occur. Most intraoperative fractures occur on the femoral side. The incidence of fractures ranges from 0.1 to 1.0 percent for cemented components and 3 to 18 percent for uncemented components. They are also more common in non-cemented femoral stems, as these have to fit exactly and can cause a fracture during insertion. When the anatomy is abnormal as in hip dysplasia. TI-RADS - Thyroid Imaging Reporting and Data Systemĭislocation can occur as a late complication in prostheses that are not well positioned, but it is most common in the immediate postoperative period (incidence 3%).įractures may be seen postoperatively in patients with poor bone stock and long stem revision prostheses or.Esophagus II: Strictures, Acute syndromes, Neoplasms and Vascular impressions.Esophagus I: anatomy, rings, inflammation.Vascular Anomalies of Aorta, Pulmonary and Systemic vessels.Contrast-enhanced MRA of peripheral vessels.Ischemic and non-ischemic cardiomyopathy.Coronary Artery Disease-Reporting and Data System.Bi-RADS for Mammography and Ultrasound 2013.Transvaginal Ultrasound for Non-Gynaecological Conditions.Acute Abdomen in Gynaecology - Ultrasound.Appendicitis - Pitfalls in US and CT diagnosis.Femoral neck horizontal plane - femoral neck torsion.Femoral neck frontal plane - angle of inclination.However there are some signs on the frontal plane (crossover sign etc). Acetabulum coverage horizontal plane - acetabular version.Acetabulum coverage frontal plane - lateral centre edge etc.Many of the measurements can be conceptualised as follows in the frontal and horizontal plane. It is almost exclusively used in the paediatric population to assess for slipped upper femoral epiphysis (SUFE) and Perthes disease. bilateral examination allows for better visualisation of the hip joints and femoral neck.lateral projection to aid and diagnose femoroacetabular impingement (FAI) due to its increased sensitivity for detecting femoral head-neck asphericity.the ideal projection for bilateral hip or femur trauma.lateral projection demonstrating the neck of the femur without movement of the either limb.can only be conducted on unilateral hip trauma.lateral projection demonstrating the neck of the femur without movement of the affected limb.standard rolled lateral view demonstrating the femoral neck and acetabular rim can only be performed on non-trauma patients.often only performed in follow up studies.demonstrates the hip joint in the AP plane, with the limb internally rotated so the neck of the femur is in profile.Hip radiographs are performed for a variety of indications including 3.2 Acetabular Depth and Coverage Calculations.3.1 Acetabular Orientation and Morphology.
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