Isolation and characterization of metallic wear debris from a dynamic intervertebral disc prosthesis

S. K. Schmiedberg, D. H. Chang, C. G. Frondoza, A. D C Valdevit, J. P. Kostuik

Research output: Contribution to journalArticle

Abstract

A dynamic intervertebral disc prosthesis (DIDP) has been developed. It consists of a CoCrMo body and uses Ti6Al4V springs to replicate the mechanical function of the lumbar joint. Wear studies have been performed previously on the DIDP using two specialized simulators to test the wear properties of the moving parts of the disc prosthesis. A pin-in-slot simulator generates wear that would occur in the hinge-pin assembly of the prosthesis. A spring-in-pocket simulator approximates the conditions under which the springs would wear against the body of the prosthesis. The spring- pocket interface is responsible for the production of approximately 90% of the total wear occurring in the prosthesis, and is therefore the main focus of this study. Bovine serum with a preservative has been used as a lubricant in both simulators. The spring-in-pocket simulator compares the effects of two different manufacturing techniques of CoCrMo (HIPing and forging) on their wear characteristics against Ti6Al4V springs. Debris from the spring- in-pocket simulator has been isolated from the serum lubricant and characterized using scanning electron microscopy techniques. The morphology of the Ti6Al4V fragments is rough and irregularly shaped. The size of these fragments ranges from 30 μm. The forged CoCrMo alloy debris has an irregular polyhedral shape, with sizes in the same range as the spring fragments. The morphology of the HIPed CoCrMo debris is spherical with a size range 30 μm. Length and width measurements of micron-size particles were made with the particle measurement feature of the scanning electron microscope. Micron-size particles were found in all stations. This article provides a unique way to isolate and analyze debris from serum lubricants used in simulators.

Original languageEnglish (US)
Pages (from-to)1277-1288
Number of pages12
JournalJournal of Biomedical Materials Research
Volume28
Issue number11
DOIs
StatePublished - Nov 1994

Fingerprint

Debris
Simulators
Wear of materials
Lubricants
Particle size
Hinges
Forging
Prostheses and Implants
Electron microscopes
Scanning
Scanning electron microscopy
titanium alloy (TiAl6V4)

ASJC Scopus subject areas

  • Biomedical Engineering
  • Biomaterials

Cite this

Schmiedberg, S. K., Chang, D. H., Frondoza, C. G., Valdevit, A. D. C., & Kostuik, J. P. (1994). Isolation and characterization of metallic wear debris from a dynamic intervertebral disc prosthesis. Journal of Biomedical Materials Research, 28(11), 1277-1288. https://doi.org/10.1002/jbm.820281105

Isolation and characterization of metallic wear debris from a dynamic intervertebral disc prosthesis. / Schmiedberg, S. K.; Chang, D. H.; Frondoza, C. G.; Valdevit, A. D C; Kostuik, J. P.

In: Journal of Biomedical Materials Research, Vol. 28, No. 11, 11.1994, p. 1277-1288.

Research output: Contribution to journalArticle

Schmiedberg, S. K. ; Chang, D. H. ; Frondoza, C. G. ; Valdevit, A. D C ; Kostuik, J. P. / Isolation and characterization of metallic wear debris from a dynamic intervertebral disc prosthesis. In: Journal of Biomedical Materials Research. 1994 ; Vol. 28, No. 11. pp. 1277-1288.
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