The articulations of the lower limb are the following :
- The hip-joint.
- The knee-joint.
- The tibio-fibular union.
- The ankle-joint.
- The tarsal joints.
- The tarso -metatarsal joints.
- The intermetatarsal joints.
- The metatarso-phalangeal joints.
- The interphalangeal joints.
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The knee is the largest joint in the body. It is rightly described as a ginglymoid joint, but there is also an arthrodial element; for, in addition to flexion and extension, there is a sliding backward and forward of the tibia upon the femoral condyles, as well as slight rotation round a vertical axis. It is one of the most superficial, and, as far as adaptation of the bony surfaces goes, one of the weakest joints, for in no position are the bones in more than partial contact.