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At least 631 records · Page 35Linked to original sources
PubMed2003

Loading of the acetabulum by polyethylene and all-ceramic inserts in metal-backed acetabular cups.

Both static and dynamic loads were applied to metal-backed acetabular cups with ceramic or polyethylene inserts and the resulting load transmissions at a simulated bone interface were determined. Perfect fit and under-sized and over-sized cavities were prepared in simulated bone substrates, lined with Fuji pressure sensitive film, and acetabular cups inserted with physiological loads. The magnitude and location of contact forces between the cup and bone were measured. These cups were then subjected to a controlled impact load and the intensity and frequency of the loads transmitted to the substrate were determined. The results suggest that a polyethylene backing for ceramics is not necessary as there were no major differences in the static and dynamic stresses transmitted to the cup-bone interface with all polyethylene or ceramic inserts.

Acetabulum↗
PubMed1992

Radiological evaluation on allograft reconstruction of the acetabulum combined with supporting device in revision total hip replacement.

We reviewed the radiographs of 25 hips of 20 patients who had received revisions of the acetabular components of total hip replacement supplemented by allograft for bone defects. Bone defects in 20 hips (80%) were classified into type D (cranio-central defect) according to Itoman's classification. In eight, sockets were installed directly on the allografts (group A). A metallic supporting device was used for reinforcing the grafts in 17 hips (group B). The position of the acetabular socket was measured on a radiograph, taken immediately after revision surgery and again at the latest follow-up. Using a MEM template, cranial and central migrations were determined. Mean cranial migration in hips of group A was 3.6 mm. Group B was 0.2 mm. Maintenance of thickness of the allografts was 60.6% in the cranial region and 75% in the central in group A. In the hips of group B, however, almost 100% of the initial thickness was maintained cranially and centrally. Allograft reconstruction of acetabular bone defect in revision total hip replacement is a beneficial procedure. The remaining pelvic bone is usually in poor condition, therefore, it is necessary to ensure primary fixation by the metallic supporting device.

Acetabulum↗
PubMed2005

Anatomical risks of using supra-acetabular screws in percutaneous internal fixation of the acetabulum and pelvis.

We conducted a study to determine whether a lag screw placed percutaneously at the level of the pelvic brim for treatment of iliac fracture risks injury to the lateral femoral cutaneous nerve (LFCN). A 4-mm Kirschner wire (K-wire) was placed percutaneously into each of 8 human cadaveric hemipelvises (4 pelvises) at the level of the pelvic brim to represent the path of screw placement. Under fluoroscopic guidance, each K-wire was advanced from the anteroinferior iliac spine toward the posterior iliac crest. Cadavers were dissected at study end. Proximity of the LFCN to the percutaneously inserted K-wire was the main outcome measured. In 4 of the 8 hemipelvises, the LFCN was disrupted; in 3 hemipelvises, it was within 4 mm of the K-wire; in the last hemipelvis, it was 23 mm away. LFCNs varied anatomically from 1 to 5 branches; disruptions occurred more in LFCNs with multiple branches than in those with 1 branch. The results suggest considerable risk for injury to the LFCN during percutaneous fixation of iliac and acetabular fractures using a percutaneous screw at the level of the pelvic brim.

Acetabulum↗
PubMed1991

[Fracture of the acetabulum, diagnosis and surgical management].

Authors report on their experiences gained in 69 operations for acetabular fractures. From the diagnostical possibilities the role of the computer tomography is stressed, the value of the not comparable information, rendered by it, underlined. They deal with the operative technique, the complications, the after-treatment and describe the results too.

Acetabulum↗