Modeling polyethylene wear acceleration due to femoral head dislocation damage.
Scratching, scraping, and metal transfer to femoral heads commonly accompany acetabular shell contact during dislocation and closed reduction maneuvers. While head damage conceptually leads to accelerated wear, reports on this subject are mainly anecdotal, and differ widely on the potency of such effect. Towards better understanding this relationship, a physically validated finite element (FE) model was used to compute polyethylene wear acceleration propensity of specific head damage patterns on thirteen retrievals. These FE models estimated wear increases averaging half an order of magnitude when compared to simulations for undamaged heads. There was no correlation between the number of dislocations sustained and wear acceleration. These results underscore the importance of implant-gentle closed reduction, and heightened wear monitoring of successfully reduced dislocation patients.
Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, Iowa; Department of Biomedical Engineering, University of Iowa, Iowa City, Iowa.
Karen M
KM
Kruger
Department of Materials Science and Engineering, Ohio State University, Columbus, Ohio.
Nishant M
NM
Tikekar
Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, Iowa; Department of Biomedical Engineering, University of Iowa, Iowa City, Iowa.
Anneliese D
AD
Heiner
Department of Materials Science and Engineering, Ohio State University, Columbus, Ohio.
John J
JJ
Lannutti
Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, Iowa; Department of Biomedical Engineering, University of Iowa, Iowa City, Iowa.
John J
JJ
Callaghan
Department of Orthopaedics and Rehabilitation, University of Iowa, Iowa City, Iowa; Department of Biomedical Engineering, University of Iowa, Iowa City, Iowa.
Thomas D
TD
Brown
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects* / Q000379:methods; D019544:Equipment Failure Analysis / Q000379:methods; D005260:Female; D005270:Femur Head / Q000473:pathology; D020342:Finite Element Analysis; D006617:Hip Dislocation / Q000209:etiology* / Q000473:pathology; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008670:Metals / Q000009:adverse effects; D008875:Middle Aged; D020959:Polyethylene / Q000009:adverse effects*; D011475:Prosthesis Failure / Q000209:etiology*
D008670:Metals; D020959:Polyethylene
dislocation; finite element analysis; retrieval; total hip arthroplasty; wear