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Related Concept Videos

Knee Joint01:23

Knee Joint

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The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
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Should we aim at undercorrection when doing a total knee arthroplasty?

T Luyckx1, F Vanhoorebeeck, J Bellemans

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Conventional total knee arthroplasty (TKA) instruments may unintentionally undercorrect pre-existing knee deformities. Surgeons should be aware of this bias to avoid excessive correction during TKA procedures.

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Medical device analysis

Background:

  • Neutral mechanical alignment is crucial for successful total knee replacement (TKA).
  • Conventional TKA instruments are widely used for knee alignment restoration.

Purpose of the Study:

  • To investigate potential undercorrection bias in conventional TKA instruments.
  • To determine if standard instruments introduce unintentional alignment deviations.

Main Methods:

  • Analysis of 456 TKA patients with a goal of neutral mechanical alignment.
  • Stratification of patients into valgus, neutral, and varus preoperative alignment groups.
  • Comparison of component and limb alignment between groups post-surgery.

Main Results:

  • Significant differences in postoperative alignment were observed across preoperative groups (p < 0.001).
  • Varus knees showed systematic undercorrection (39.8% remained in >3° varus), linked to component positioning.
  • Valgus knees exhibited undercorrection (20.2% remained in <-3° valgus), primarily due to femoral component bias.

Conclusions:

  • Conventional TKA instruments demonstrate a systematic unintentional bias towards undercorrecting pre-existing deformities.
  • Awareness of this inherent bias is critical for surgeons to prevent excessive undercorrection.
  • Intentionally aiming for slight undercorrection may result in significant deviation due to instrument bias.