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Related Experiment Videos

Tibial interface wear in retrieved total knee components and correlations with modular insert motion.

Anand R Rao1, Gerard A Engh, Matthew B Collier

  • 1Anderson Orthopaedic Research Institute, Alexandria, Virginia 22307, USA.

The Journal of Bone and Joint Surgery. American Volume
|October 16, 2002
PubMed
Summary

Backside wear on total knee replacement components is linked to the movement between the polyethylene insert and metal baseplate. Improved locking mechanisms are needed to reduce wear debris in total knee arthroplasty.

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Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Wear analysis

Background:

  • Backside wear of polyethylene inserts in total knee arthroplasty (TKA) is common at revision surgery.
  • Wear on the metal baseplate surface has not been previously described.
  • This study characterizes backside wear in TKA components and its relationship with modular element motion.

Purpose of the Study:

  • To characterize backside wear on retrieved polyethylene inserts and corresponding metal baseplates.
  • To investigate the relationship between backside wear and relative motion of modular elements in TKA.

Main Methods:

  • Analyzed 29 retrieved modular tibial components from fixed-bearing TKA designs.
  • Graded backside wear on polyethylene inserts and metal baseplates using a standardized scoring system.

Related Experiment Videos

  • Measured relative insert-baseplate motion to compute the insert motion index.

    • Main Results:

    • Mean insert motion index was 416 µm.
    • Mean backside wear scores were 30 for inserts and 28 for baseplates.
    • Insert motion positively correlated with polyethylene and baseplate wear (p<0.003).

    Conclusions:

    • Backside wear in TKA components is correlated with relative motion between the insert and baseplate.
    • Novel locking mechanisms are required to secure polyethylene inserts and minimize wear debris generation.