Assertion: patella | /r/CapableOf | slide over the front of the knee joint
Facets:
Source sentences:
text: The patella protects the tendon as it slides over the front of the knee joint as the knee joint is flexed and extended.
text: The patella protects the tendon as it slides over the front of the knee joint, as the knee joint is flexed and extended (see Figure 3).