The Tribological and Lubrication Responses of a Cobalt-Chromium Femoral Head in Total Hip Arthroplasty

Seonghun Park; Duong Cong Truyen; Jae-Hoon Lee; Younho Cho; Seung-Jae Park; Keun-Min Park; Jun-Dong Chang; Sang-Soo Lee

doi:10.5371/jkhs.2010.22.3.227

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Park, Truyen, Lee, Cho, Park, Park, Chang, and Lee: The Tribological and Lubrication Responses of a Cobalt-Chromium Femoral Head in Total Hip Arthroplasty

Original Article

The Journal of the Korean Hip Society

The Journal of the Korean Hip Society 2010; 22(3): 227-233.

Published online: 30 September 2010

DOI: https://doi.org/10.5371/jkhs.2010.22.3.227

The Tribological and Lubrication Responses of a Cobalt-Chromium Femoral Head in Total Hip Arthroplasty

Seonghun Park, PhD^*,^†, Duong Cong Truyen, MS^†, Jae-Hoon Lee, MS^†, Younho Cho, PhD^†, Seung-Jae Park, MD^*, Keun-Min Park, MD^*, Jun-Dong Chang, MD^*, Sang-Soo Lee, MD^*

^*Institute for Skeletal Aging & Department of Orthopedic Surgery, College of Medicine, Hallym University, Chuncheon, Korea.

^†School of Mechanical Engineering, Pusan National University, Busan, Korea.

Address reprint request to Sang-Soo Lee, MD. Institute for Skeletal Aging & Department of Orthopedic Surgery, Chucheon Sacred Heart Hospital, College of Medicine, Hallym University, 153 Gyo-dong, Chuncheon 200-704, Korea. TEL: +82-33-240-5197, FAX: +82-33-252-9875, totalhip@hallym.ac.kr

Received 31 May 2010 Revised 24 September 2010 Accepted 27 September 2010

Abstract

Purpose

This study aimed at investigating the role of albumin as a boundary lubricant in the lubrication of the Co-Cr femoral head of artificial hip implants by measuring the tribological parameters of the Co-Cr femoral head with Atomic Force Microscope (AFM) techniques.

Materials and Methods

Samples were prepared from the main wear region of a Co-Cr femoral head from revision hip surgery. Two types of solutions were prepared as lubricants: PBS (Phosphate Buffered Saline) as a control solution and BSA (Bovine Serum Albumin) as a lubricant at concentrations of 10, 20, 30 and 40 mg/ml in PBS solution.

Results

There were statistically significant differences in the frictional coefficients (µ) of a Co-Cr head between the PBS control and all the concentrations of BSA (10, 20, 30, 40 mg/ml) (P<0.001). Similarly, there were statistically significant differences for the µ between the BSA concentrations of 10, 20, 30 and 40 mg/m for all the cases except between the BSA of 30 and 40 mg/ml (P<0.01).

Conclusion

There exists a maximum protein concentration of BSA to play a role as an effective boundary lubricant through adsorption on the surface of Co-Cr femoral head.

Keywords: Atomic force microscope (AFM), Bovine serum albumin (BSA), Boundary lubrication, Total hip arthroplasty, Co-Cr femoral head

Figures and Tables

Fig. 1

(A) Specimen (10×10 mm² squared area, 5 mm thickness) for AFM analysis was prepared from CoCr femoral head retrieved from revision surgery. (B) Schematic of Atomic Force Microscope (AFM): AFM device is composed of laser source, cantilever, photo-detector, and piezo-electric (PZT) tube scanner.

Fig. 2

Typical AFM surface topographies over a dimension of 25 µm×25 µm for CoCr femoral head, which are used to calculate surface roughness (Rq): (A) Three-dimensional AFM image, (B) Two-dimensional AFM image, (C) Average line profile analysis.

Fig. 3

Typical plots of friction forces versus normal forces for the lubricants of (A) PBS, (B) BSA of 20 mg/ml, (C) BSA of 40 mg/ml.

Fig. 4

The frictional coefficients (µ) of the CoCr femoral head through AFM was decreased with an increase in the concentrations of BSA.

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