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Related Experiment Videos

Dislocation following primary posterior-stabilized total knee arthroplasty

A V Lombardi1, T H Mallory, B K Vaughn

  • 1Joint Implant Surgeons, Inc., Columbus, OH 43215.

The Journal of Arthroplasty
|December 1, 1993
PubMed
Summary

The Insall-Burstein Posterior Stabilized Condylar Prosthesis (IB-II) showed a higher dislocation rate than IB-I and IB-II modified systems. Increased postoperative flexion was linked to dislocations in total knee arthroplasty patients.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Reconstructive Surgery

Background:

  • Total knee arthroplasty (TKA) is a common procedure for knee osteoarthritis.
  • The Insall-Burstein Posterior Stabilized Condylar Prosthesis has undergone several modifications.
  • Posterior dislocation is a rare but serious complication following TKA.

Purpose of the Study:

  • To evaluate the dislocation rates of different Insall-Burstein prosthesis models.
  • To identify risk factors associated with posterior dislocation after TKA.
  • To compare patient characteristics and surgical outcomes between dislocated and non-dislocated TKA cases.

Main Methods:

  • Retrospective analysis of 3,032 primary TKAs performed between 1981 and 1991.
  • Comparison of dislocation rates between IB-I, IB-II, and IB-II modified prosthesis systems.

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  • Assessment of patient demographics, surgical parameters, and postoperative outcomes in dislocated versus control groups.

    • Main Results:

    • A statistically significant higher rate of posterior dislocation was observed with the IB-II system compared to IB-I and IB-II modified systems (P < .001).
    • No significant differences were found between dislocated and control groups in terms of sex, age, weight, height, alignment, or reconstruction dimensions.
    • Increased postoperative flexion was significantly associated with posterior dislocations (118° vs. 105°, P < .001).

    Conclusions:

    • The IB-II prosthesis system demonstrated a higher propensity for posterior dislocation compared to other Insall-Burstein variants.
    • Postoperative knee flexion appears to be a critical factor in the etiology of posterior dislocations after TKA.
    • Conservative management was successful in the majority of posterior dislocation cases.