=The Knee.=—These dislocations are rarely complete, and are easily reduced; the lateral ones by flexing the thigh on the belly, straightening the leg, and rotating it a little from side to side. _Another Plan._—_Apparatus._—Two jack towels. This is more useful when the tibia is carried backwards. Lay the patient on his back, and slip a jack towel in a clove hitch up the leg to the ham, and another round the small of the leg; the thigh is bent and retained in a semiflexed position by an assistant holding the jack towel at the ham, while a second pulls on the one at the ankle and so disengages the bones from each other, when the surgeon readily slips them into place. After reduction is accomplished, the limb should be fixed in a leathern back splint until the inflammation subsides. =Dislocation of the Patella.=—The displacement of this bone on to the outer or inner condyle is generally easily reduced if the knee is straightened and the vasti relaxed by bending the thigh on the belly. When the patella is turned on its own axis, the side, not the under surface, is locked against the condyle, and reduction is sometimes extremely difficult or impossible. The same movements must be adopted as for simple lateral displacement, and the surgeon must endeavour to release the bone by pressing its upper edge downwards with his thumbs. After their reduction, all dislocations about the knee-joint must be treated by rest, straight splints, and evaporating lotions. =The Foot= is very rarely dislocated from the leg without fracture of the malleoli. Its reduction requires simple extension of the foot on the leg, with the knee bent; the surgeon grasps the heel in one hand, the foot in the other, while an assistant fixes the thigh in the half-bent position. The foot is first drawn downwards to disengage it from the tibia, and then directed into its place. After reduction the limb should be put in a McIntyre’s splint, in the way described for fracture of the tibia near the ankle-joint.