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Decrease of tibial tuberosity trochlear groove distance following mechanically aligned total knee arthroplasty.

Stefan M Zimmermann1,2, Yves Scherrer3, Martin Zaleski

  • 1Department of Orthopaedics, Balgrist University Hospital, Forchstrasse 340, 8008, Zurich, Switzerland. St.zimmermann@gmx.ch.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|April 1, 2022
PubMed
Summary
This summary is machine-generated.

Total knee arthroplasty significantly reduces tibial tuberosity trochlear groove distance (TTTG), a key factor in anterior knee pain. This computer simulation suggests improved patellar tracking after surgery.

Keywords:
Anterior knee painHip–knee–ankle anglePatellofemoral instabilityTibial tuberosity trochlear grooveTotal knee arthroplasty

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Area of Science:

  • Orthopedic surgery
  • Biomechanical analysis
  • Medical imaging

Background:

  • Anterior knee pain (AKP) is a frequent complication after total knee arthroplasty (TKA).
  • The tibial tuberosity trochlear groove distance (TTTG) is crucial for patellofemoral joint loading and can influence patellar tracking.
  • Elevated TTTG is associated with patellar maltracking and subsequent anterior knee pain.

Purpose of the Study:

  • To investigate the impact of total knee arthroplasty (TKA) on the tibial tuberosity trochlear groove distance (TTTG).
  • To assess changes in TTTG following TKA using computer simulation based on preoperative planning.

Main Methods:

  • Preoperative CT data from 250 patients undergoing TKA with patient-specific instrumentation were analyzed.
  • Tibial tuberosity trochlear groove distance (TTTG) was measured using 3D planning software.
  • A computer simulation was used to predict and measure the postoperative TTTG, analyzing neutral, valgus, and varus knee alignments.

Main Results:

  • The simulated postoperative TTTG significantly decreased compared to the preoperative measurements across all analyzed knee alignments (p < 0.001).
  • Median TTTG reduced from 15.0 mm preoperatively to 6.5 mm postoperatively.
  • The mean reduction in TTTG did not significantly differ between neutral, valgus, and varus knee groups.

Conclusions:

  • Mechanically aligned TKA, as simulated, significantly reduces TTTG in neutral, valgus, and varus knees.
  • This reduction in TTTG suggests a potential improvement in patellar tracking and a decrease in anterior knee pain post-TKA.
  • Further clinical studies are needed to confirm the clinical significance of these simulated findings.