Fixed-angle screws vs standard screws in acetabular prosthesis fixation: a cadaveric biomechanical study.

Secure fixation of acetabular components in total hip arthroplasty can be challenging. The purpose of this study was to perform biomechanical analysis of cup fixation strength using fixed-angle vs standard screw fixation. Multihole, porous-backed acetabular prostheses were implanted in both acetabuli of 8 cadaveric pelves using standard press-fit techniques.

Transcutaneous tibial implants: a surgical procedure for restoring ambulation after amputation of the distal aspect of the tibia in a dog.

Objective: To report surgical planning, technique, and long-term outcome of custom transcutaneous tibial implants used to restore ambulation after bilateral pelvic limb amputation in a dog.

Study Design: Case report.

Animals: A 4-year-old, 25.

Intraarterial chemotherapy for extremity osteosarcoma and MFH in adults.

Unlabelled: The neoadjuvant treatment of osteosarcoma using intravenous agents has resulted in survival rates of 55% to 77% [3, 5, 6, 20, 22, 35]. We designed a neoadjuvant chemotherapy protocol using combined intraarterial and intravenous agents to treat high-grade osteosarcoma and malignant fibrous histiocytoma of bone in an attempt to improve survival. We report the results of treating 53 adults (age 18-77 years) diagnosed with nonmetastatic extremity osteosarcoma or malignant fibrous histiocytoma.

Does the second-generation intercalary humeral spacer improve on the first?

Unlabelled: Since publication of the results of a first-generation intercalary humeral spacer, a newer design has been available that addressed the weaknesses of the first. This study evaluated the hypothesis that the second-generation lap joint junction intercalary humeral spacer reduced complications compared with the original male-female taper design. We retrospectively reviewed the charts of 32 consecutive patients who had undergone placement of an intercalary humeral spacer.

Surgical management of conventional grade I chondrosarcoma of long bones.

We retrospectively reviewed 70 patients with low-grade (Grade I) chondrosarcoma of the appendicular skeleton treated at the Mayo Clinic from 1980 to 2001. Fifty-four patients underwent wide resections and three patients underwent marginal excision for radiographically aggressive lesions. Thirteen patients were treated with intralesional curettage for more indolent lesions.

Effects of screw eccentricity on the initial stability of the acetabular cup.

One of the major failure modes of cementless acetabular components is the loosening of the acetabular cup, which is mostly attributable to insufficient initial stability. A hemispherical cup with a porous coating which is inserted with press-fit fixation and secured with several screws is one of the most widely used approaches. Many studies have found that bone screws are very helpful aids for cup fixation, but the optimal surgical technique for inserting screws has not been clearly reported.

Mechanical effects of partial sacrectomy: when is reconstruction necessary?

We examined the mechanical consequences of high partial transverse sacrectomy. Ten human cadaveric pelves were randomly assigned to three groups. In the Control Group, the sacrum was left entirely intact.

Reconstruction after total sacrectomy: early experience with a new surgical technique.

Unlabelled: Nine patients had sacrectomy with ilio-lumbar arthrodesis for treatment of sacral malignancies at our institution between 2000 and 2004. Five patients had total sacrectomy, three had a sagittal hemisacrectomy, and one had an extended internal hemipelvectomy Type I-S. The average patient age was 39 years.

Accuracy of computed tomography in assessing thoracic pedicle screw malposition.

Objective: Transpedicular instrumentation of the thoracic spine is potentially dangerous because of the close proximity of vital structures and the morphologic variability seen. Computed tomography has become the gold standard in evaluating the position of thoracic pedicle screws in vivo. Unfortunately, despite its common use, the accuracy of computed tomography has not been adequately investigated.