Clark's test, also known as the patellar grind test or Osmond-Clarke test, is a straightforward procedure used to evaluate knee pain. This simple examination helps determine if pain originates from cartilage damage beneath the kneecap (patella). A positive test, indicated by pain or a grinding sensation during the test, suggests potential patellofemoral pain syndrome. Further testing is usually needed to confirm a diagnosis and guide treatment.
How Clark's Test Works
The test involves the healthcare provider moving the kneecap while the patient's leg is extended. A grinding sensation or pain during this movement is a positive sign.
- Patient Position: The patient lies on their back (supine) or sits with their leg extended.
- Examiner Action: The examiner presses down on the kneecap while moving it.
- Positive Result: Pain or grinding indicates potential patellofemoral issues.
The test's simplicity makes it a valuable initial assessment tool for knee pain, though it doesn't provide a definitive diagnosis on its own.
It's important to note that "Clark's test" can also refer to other unrelated tests, like those used in product validation (Clark Testing) or in psychological studies (the "doll tests" by Kenneth and Mamie Clark). However, in a medical context, Clark's test almost always refers to the patellar grind test.
