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Patella fracture


  • The patella is largest sesamoid bone in the body.
  • It forms part of the extensor mechanism of the knee and is held in place by the patellar tendon, quadriceps tendon and the adjacent retinaculae.
  • Patella fracture is classified according to site and appearance – longitudinal, transverse, stellate, marginal, polar or osteochondral fractures. All except small rim avulsions are thought of as intracapsular.
  • The commonest fracture is the transverse type resulting from a powerful muscular contraction transmitted to the patella. This type is commonly displaced.
  • AP and lateral views are essential. In some cases a skyline view is helpful but often difficult to obtain in the acute stage as knee flexion is required.
  • The fracture is usually obvious. Look for associated lipohaemarthrosis on the horizontal beam lateral.
  • The congenital bi-partite and multi-partite patella; usually occur at the superolateral aspect of the patella. In these the fragments tend to be rounded and corticated as compared to the sharp non-sclerotic margins in a fracture. MRI is useful in subtle cases.
Displaced horizontal patella fracture
Displaced horizontal patella fracture.



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