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Patellar J Sign

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Other Names

Uppercut Test
Demonstration of the normal patella J sign[1]
  • J-sign
  • Patellar J-sign
  • Inverted J sign
  • J-sign test

Purpose


Description

  • Patient is seated with leg hanging off examination table
  • Patient is asked to bring knee into full extension and then passively flex to 90° or more
  • Abnormal
    • Laterally tracking patella suddenly shifts medially as it engages the trochlear groove of the distal Femur

Pathology


Evidence

  • Needs to be updated

See Also


References

  1. D’Ambrosi, Riccardo, et al. "Anterior knee pain: state of the art." Sports Medicine-Open 8.1 (2022): 98.
Created by:
John Kiel on 26 October 2020 00:01:54
Authors:
Last edited:
4 January 2024 23:40:25
Category: