- Discussion:
- acetabular component loosening:
- osteolysis / polyethylene wear:
- Component Position:
- acetabular component flexion:
- to measure postoperative cup position, a standing true lateral view of the operated hip allowed direct measurement of cup flexion;
- cross table lateral:
- to measure anteversion, draw a line tangential to the face of the cup and a line drawn perpendicular to the horizontal plane;
- note that supine cross table lateral radiographs may be unreliable for measuring acetabular component anteversion since amount of flexion in the
contra-lateral hip will affect the amount of pelvic tilt (and anteversion);
- Lowenstein lateral radiograph:
- provides a lateral view of the acetabular subchondral bone and the cup after implantation
- modified Lowenstein lateral radiograph is similar to an oblique radiograph of the pelvis;
- patient is turned onto the affected hip at least 45° and as much as necessary to allow the lower limb to be in abduction and external rotation
and to be flat on the x-ray table;
- Assessment of Pelvic Defects: (Classification of Acetabular Defects and Bone Grafting Options)
- Paprosky classification
- assesment of posterior column: (pelvic discontinuity)
- in cases of acetabular loosening, the integerty of the posterior column may determine whether or not allografting is required
Acetabular revision in total hip replacement with a press-fit cup.
Extra-large press-fit cups without screws for acetabular revision.
A simplified method to determine acetabular cup anteversion from plain radiographs.
Functional Pelvic Orientation Measured from Lateral Standing and Sitting Radiographs.