The goals of this research are to increase the functional use and long- term outcome of patients with total hip replacement and hip revision. This study is important due to the necessity of using whole bone segmental allografts to replace proximal femurs that have become deficient in bone stock secondary to menopause, disuse, multiple revision arthroplasties, or that have tumor infiltration. The problem lies in the fact that functional impairment due to inadequate or failed muscle reattachment to the allograft commonly occurs. The working hypothesis for this investigation is that there are specific long-term time-related changes that occur in functional weight-bearing, densitometry, histology, and mechanical characteristics during the incorporation of the allograft tendon and bone following proximal femoral reconstruction that will allow selection of the optimal technique for this reconstruction. Using a canine model, three methods of gluteal attachment to proximal femoral allografts will be compared: (a) a host tendon to allograft tendon attachment using horizontal mattress sutures, (b)a host bone to allograft bone attachment using a cable grip system, and (3) a host bone bicortical half-shell wrapped around the allograft bone without disruption of the host tendon-bone interface. The prosthesis will be cemented to a frozen allograft and this composite cemented to the distal femur after an excision of the proximal 25% of the femur. The animals will be evaluated bimonthly with radiography, densitometry, and functional weight-bearing and at 9 (24 dogs) and 18 (24 dogs) months with histology and mechanical testing following humane euthanasia.

Agency
National Institute of Health (NIH)
Institute
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
5F32AR008419-03
Application #
2769543
Study Section
Orthopedics and Musculoskeletal Study Section (ORTH)
Project Start
1998-09-01
Project End
Budget Start
1998-09-01
Budget End
1999-06-30
Support Year
3
Fiscal Year
1998
Total Cost
Indirect Cost
Name
University of Wisconsin Madison
Department
Surgery
Type
Schools of Veterinary Medicine
DUNS #
161202122
City
Madison
State
WI
Country
United States
Zip Code
53715
Pluhar, G Elizabeth; Manley, Paul A; Heiner, John P et al. (2007) Gluteal muscle attachment during proximal femoral reconstruction in a canine model. J Orthop Res 25:208-20
Pluhar, G E; Manley, P A; Heiner, J P et al. (2001) The effect of recombinant human bone morphogenetic protein-2 on femoral reconstruction with an intercalary allograft in a dog model. J Orthop Res 19:308-17
Pluhar, G E; Heiner, J P; Manley, P A et al. (2000) Comparison of three methods of gluteal muscle attachment to an allograft/endoprosthetic composite in a canine model. J Orthop Res 18:56-63