Knee

Patellar Tendon Rupture

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Patellar Tendon Rupture

  • Risk Factors
  1. Patellar Tendinopathy may predispose to Patellar Tendon Rupture
  • Mechanism
  1. Forceful knee flexion against resistance
  • Signs
  1. Large Knee Effusion
  2. Defect between tibial tubercle and inferior Patella
  3. Difficult active knee extension
  • Differential Diagnosis
  1. Patellar Dislocation
  2. Quadriceps tendon rupture (elderly)
  3. Tibial tuberosity avulsion (adolescents)
  • Imaging
  1. Insall-Salvati Ratio for Patella evaluation
    1. Distance ratio between
      1. Proximal tibial tubercle
      2. Inferior pole of the Patella
    2. Normal ratio: +1 or -0.2
  2. Interpretation: Severe Patella alta (high riding)
    1. Suggests Patellar ligament rupture
  • Management
  1. Surgical Correction within 10 days of injury
  2. Cast immobilization for 6 weeks following surgery
  3. Physical therapy
  • Complications
  • Associated with delayed surgery
  1. Quadriceps contracture shortens extensor mechanism