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Related Experiment Videos

One-peg versus three-peg patella component fixation in total knee arthroplasty.

C M Larson1, C M McDowell, P F Lachiewicz

  • 1University of North Carolina-Chapel Hill, Department of Orthopaedics, 27599, USA.

Clinical Orthopaedics and Related Research
|November 22, 2001
PubMed
Summary

This study compared patella fixation in total knee arthroplasty. While the three-peg design showed a trend towards fewer fractures, neither fixation method demonstrated a significant advantage or disadvantage in this patient cohort.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering
  • Clinical Research

Background:

  • Total knee arthroplasty (TKA) often involves patellar resurfacing.
  • Historically, a single central peg was used for patellar component fixation.
  • A newer design utilizes three small pegs for cement fixation, with some reports of failure.

Purpose of the Study:

  • To prospectively compare the outcomes of two patellar component fixation designs in posterior-stabilized TKA.
  • To evaluate the incidence of patellar fracture, anterior knee pain, and other complications associated with each fixation type.

Main Methods:

  • Prospective, consecutive study of 228 posterior-stabilized TKAs performed by a single surgeon.
  • Group A (84 knees): central peg all-polyethylene patella component.

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  • Group B (144 knees): three-peg patella component.

    • Main Results:

    • Mean follow-up: 6.7 years (Group A) and 3.5 years (Group B).
    • Patella fracture prevalence: 4.7% (Group A) vs. 2.1% (Group B), not statistically significant.
    • Anterior knee pain: 7.1% (Group A) vs. 9% (Group B). No patella clunk, subluxation, or peg fracture observed.

    Conclusions:

    • The three-peg patella design did not show a statistically significant advantage over the central peg design in this cohort.
    • No increased risk of component failure was identified with the three-peg patella design at this follow-up duration.
    • Further long-term studies may be needed to fully elucidate any differences in complication rates.