Assertion: knee's joint | /r/AtLocation | place
Facets:
value: by the four ligaments
type: OTHER
value: firmly
type: MANNER
Source sentences:
text: The joint is held firmly in place by the four ligaments, the medial collateral ligament (MCL), the anterior cruciate ligament (ACL), the lateral collateral ligament (LCL), and the posterior cruciate ligament (PCL).