Assertion: patellar ligament | /r/CapableOf | pull on the tibia
Facets:
value: to extend the leg
type: PURPOSE
Source sentences:
text: When the muscles of the quadriceps femoris group contract, it pulls on the patella via the quadriceps tendon; the patella is pulled proximally; the patellar ligament then pulls on the tibia to extend the leg at the knee.