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Surface slide track mapping of implants for total disc arthroplasty
Philippe E Paré1, Frank W Chan, Sanghita Bhattacharya
1Medtronic, Spinal and Biologics, 1800 Pyramid Place, Memphis, TN 38132, USA. philippe.pare@medtronic.com
Journal of Biomechanics
|January 13, 2009
Summary
Standardized testing of artificial disc wear is crucial. This study characterized wear paths under various ISO and ASTM conditions, finding simulator type irrelevant but ISO guidance yielding longer cervical wear tracks than lumbar.
Area of Science:
- Biomaterials Engineering
- Orthopedic Biomechanics
- Spinal Implant Technology
Background:
- Total disc arthroplasty is an emerging alternative to spinal fusion.
- Lack of standardized wear assessment methods for artificial discs has hindered development.
- Recent ASTM and ISO guidance documents offer standardized testing but suggest varied kinematic profiles.
Purpose of the Study:
- To characterize the slide tracks generated by seven test conditions outlined in ISO and ASTM guidance documents.
- To compare wear path characteristics under lumbar and cervical motion conditions using spine wear simulators.
- To evaluate the influence of different kinematic profiles on artificial disc wear.
Main Methods:
- Analytical characterization of slide tracks using a mathematical algorithm.
- Experimental validation of the analytical results.
- Testing performed on a ball-in-socket articulation under simulated lumbar and cervical motion.
Main Results:
- Four test conditions produced similar elliptical sliding tracks for both lumbar and cervical motions.
- Three test conditions generated curvilinear and ribbon-shaped wear paths.
- Slide track geometry was insensitive to the type of spine wear simulator used.
Conclusions:
- The choice of kinematic profile significantly influences artificial disc wear paths.
- ASTM guidance resulted in similar normalized sliding distances for lumbar and cervical conditions.
- ISO guidance led to longer cervical slide tracks compared to lumbar conditions, highlighting discrepancies in standardization.
