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Variation in the Posterior Condylar Angle.

Łukasz Cieliński1, Damian Kusz1, Michał Wójcik1

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The Posterior Condylar Angle (PCA) in knee replacement surgery shows significant variation, with no strong correlation to gender, BMI, or body side. However, height and weight may influence PCA in females, warranting further research.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Anatomy

Background:

  • Accurate implant positioning is crucial for Total Knee Replacement (TKR) clinical success.
  • The Posterior Condylar Angle (PCA) guides femoral component rotation during TKR, typically set at 3° external rotation.
  • Understanding PCA variations is essential for optimizing surgical outcomes.

Purpose of the Study:

  • To investigate the variability of the Posterior Condylar Angle (PCA).
  • To explore potential correlations between PCA and patient demographics: gender, body height, weight (BMI), and body side.

Main Methods:

  • Utilized Angio-CT scans from 75 patients (2012-2014) with suspected vascular disorders.
  • Measured the Posterior Condylar Angle (PCA) and Posterior Twist Angle for each knee.
  • Analyzed data for correlations with gender, body height, weight (BMI), and laterality.

Main Results:

  • The average PCA was 2.7±2.1°, with no statistically significant gender-based differences.
  • A high degree of symmetry was observed between contralateral knees.
  • No significant correlation was found between PCA and gender, BMI, or body side.

Conclusions:

  • The Posterior Condylar Angle (PCA) exhibits considerable variation (3.6° internal to 9.0° external rotation), requiring surgeon consideration.
  • PCA values do not correlate with gender, age, BMI, or body side, demonstrating limb symmetry.
  • Further studies on larger cohorts are needed to confirm potential influences of height and weight on PCA in female patients.