lock the kneeの例文

• In doing leg presses, a common error is to quickly extend the legs and lock the knees.
• When the knee is in full extension, the femur slightly medially rotates on the tibia to lock the knee joint in place.
• By night we were chewed up and spit out by some charm school ladies who cut our hair, taught us to walk all over again ( glide-- don't lock the knees ), and how to slip into and out of our topcoats still looking like ladies rather than disoriented orangutans.