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Technical Brief

A Novel Method for Measuring Polyethylene Hip Liner Wear Using a Coordinate Measuring Machine and a Dual Stylus Probe

[+] Author and Article Information
Benjamin P. Cunkelman

Thayer School of Engineering,
Dartmouth College,
14 Engineering Drive,
Hanover, NH 03755
e-mail: bpcunkelman@gmail.com

Byoungwook Jang

Thayer School of Engineering,
Dartmouth College,
14 Engineering Drive,
Hanover, NH 03755
e-mail: byoungwookjang@gmail.com

Douglas W. Van Citters

Mem. ASME
Thayer School of Engineering,
Dartmouth College,
14 Engineering Drive,
Hanover, NH 03755
e-mail: dvc@dartmouth.edu

John P. Collier

Thayer School of Engineering,
Dartmouth College,
14 Engineering Drive,
Hanover, NH 03755
e-mail: jpc@dartmouth.edu

Manuscript received July 28, 2015; final manuscript received November 10, 2015; published online January 12, 2016. Assoc. Editor: Rita M. Patterson.

J. Med. Devices 10(1), 014502 (Jan 12, 2016) (4 pages) Paper No: MED-15-1232; doi: 10.1115/1.4032107 History: Received July 28, 2015; Revised November 10, 2015

Ex vivo high-resolution measurement of highly crosslinked (HXL) polyethylene hip liner wear is necessary to characterize the in vivo performance of these polymers that exhibit increased wear resistance. Current studies focus on using a coordinate measuring machine (CMM) to acquire data representing the bearing surface(s) of HXL hip liners and use this data to determine linear and volumetric wear. However, these current techniques are subject to error in both data acquisition and data analysis. The purpose of this study was to identify these sources of error and present a novel method for HXL wear measurement that minimizes these contributions to error: our novel methods use a CMM to measure both the articular and backside surfaces of HXL hip liners for subsequent data analysis in Geomagic Control and matlab. Our method involves a vertical orientation of the hip liner to enable one CMM scan of both sides of the hip liner. This method minimizes identified sources of error and proves to be an effective approach for data acquisition of HXL hip liner wear. We also find that our data analysis technique of calculating changes in wall thicknesses is effective in accounting for errors associated with data analysis. Validation of this technique occurred via measurement of two never-implanted HXL hip liners of different sizes (28 mm and 32 mm). In comparing the 32 mm hip liner to its corresponding computer-aided design (CAD) model, we found that our data acquisition technique led to a 0.0019 mm discrepancy between the scanned liner and its CAD model in measured thickness at the pole. We calculated 0.0588 mm and 0.0800 of linear wear for the 28 mm and 32 mm hip liners, respectively, based on our data analysis algorithm. We hypothesize that these reported linear wear values of the never-implanted hip liners are due to machining tolerances of the hip liners themselves.

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Figures

Grahic Jump Location
Fig. 1

A HXL liner held vertically in an aluminum mount to allow for continuous scanning of the articular and backside surfaces on a CMM

Grahic Jump Location
Fig. 2

The backside and articular surfaces of the point clouds after they have been imported into Geomagic Control

Grahic Jump Location
Fig. 3

A representative shape of a HXL liner after the two surfaces have been surfaced wrapped

Grahic Jump Location
Fig. 4

A representative shape of a HXL liner after the two surfaces have been turned into a closed-contour shape for wall thickness measurements

Grahic Jump Location
Fig. 5

Linear wear depth measurements on a never-implanted 28 mm liner

Grahic Jump Location
Fig. 6

Example wall thickness data of a device with in vivo wear and retrieval artifact

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