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Patella Grind Test

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Other Names

Patellar Grind Test
Clinical demonstration of the patellar grind test
  • Clarke's Test
  • Clarks Test
  • Clarke Sign
  • Patella compression test
  • Osmond-Clarke test
  • Patella Grind Test



  • The patient is supine with leg extended in a neutral position
  • The examiner places the superior pole of the patella in the webspace between their 1st and 2nd digits while applying caudal pressure
  • The patient is instructed to gently and gradually contract the quadriceps muscle.
  • Positive Test:
    • Patellofemoral Joint Pain
    • Patient often unable to complete test

Modified Version

  • Patient is asked to raise their extended leg off the bed



Patellofemoral Pain Syndrome

  • Nijs et al[1]
    • Sensitivity: 48%
    • Specificity: 75%
    • LR+: 1.9
    • LR-: 0.7
    • PPV: 68
    • NPV: 57

See Also


  1. Nijs, J., Van Geel, C., Van der Auwera, C., & Van de Velde, B. (2006). Diagnostic value of five clinical tests in patellofemoral pain syndrome. Manual Therapy, 11(1), 69e77.
Created by:
John Kiel on 10 April 2022 10:30:49
Last edited:
30 January 2024 14:53:02