II. Risk Factors

  1. Patellar Tendinopathy may predispose to Patellar Tendon Rupture

III. Mechanism

  1. Forceful knee flexion against resistance

IV. Signs:

  1. Large Knee Effusion
  2. Defect between tibial tubercle and inferior Patella
  3. Difficult active knee extension

V. Differential Diagnosis

  1. Patellar Dislocation
  2. Quadriceps tendon rupture (elderly)
  3. Tibial tuberosity avulsion (adolescents)

VI. 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

VII. Management

  1. Surgical Correction within 10 days of injury
  2. Cast immobilization for 6 weeks following surgery
  3. Physical therapy

VIII. Complications: Associated with delayed surgery

  1. Quadriceps contracture shortens extensor mechanism

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Related Studies

Ontology: Traumatic rupture of patellar tendon (C0263969)

Concepts Injury or Poisoning (T037)
SnomedCT 30832001, 415748002
English rupture of patellar tendon (diagnosis), rupture of patellar tendon, patellar rupture tendon, of patellar tendon rupture, patellar ruptures tendon, patellar tendon rupture, Rupture of patellar tendon, Patellar tendon rupture, Rupture of patellar tendon (disorder), Traumatic rupture of patellar tendon (disorder), Traumatic rupture of patellar tendon
Spanish ruptura traumática de tendón rotuliano, ruptura traumática del tendón rutuliano, ruptura traumática de tendón rotuliano (trastorno), ruptura traumática del tendón patelar, ruptura traumática del tendón rutuliano (trastorno), ruptura del tendón de la rótula, ruptura del tendón rotuliano (trastorno), ruptura del tendón rotuliano