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Manipulation under Anesthesia: Does Polyethylene Thickness Matter?

James E Feng1, Afshin A Anoushiravani1, Jacob Ziegler1

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Polyethylene liner thickness in total knee arthroplasty (TKA) does not predict postoperative stiffness. Proper implant fit for stability is crucial for reducing manipulation under anesthesia (MUA) rates after TKA.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering

Background:

  • Total knee arthroplasty (TKA) is a primary treatment for severe knee osteoarthritis.
  • Suboptimal polyethylene liner selection in TKA may contribute to postoperative stiffness.
  • Manipulation under anesthesia (MUA) is a potential complication following TKA.

Purpose of the Study:

  • To investigate the association between the thinnest tibial implant thickness and MUA rates.
  • To determine if implant manufacturer influences MUA likelihood after TKA.
  • To evaluate the correlation between polyethylene liner thickness and postoperative knee stiffness.

Main Methods:

  • Retrospective review of 2,728 unilateral TKAs performed between January 2012 and November 2015.
  • Analysis of tibial component thickness, normalized by implant system.
  • Comparison of MUA rates for the thinnest liner versus the next two sizes, and against all other sizes.

Main Results:

  • Overall, 2.60% of patients (71) required MUA.
  • No statistically significant difference in MUA rates was found when comparing the thinnest liner to the next two sizes (p=1).
  • Subset analyses showed inconsistent significant differences in MUA rates across different comparisons.

Conclusions:

  • Polyethylene liner thickness alone is not a reliable predictor of postoperative stiffness requiring MUA.
  • The most critical factor in polyethylene liner selection is achieving a proper fit for optimal flexion and extension stability.
  • Further research may explore other factors contributing to TKA stiffness and MUA.