Fill in the Blanks InjuriesOnline version Injuries to the locomotor system by Mariam Domingo 1 twisting contraction fracture heal effort cast ankles posture plaster ligaments break strains Bone . These happen when bones or crack . In order for the bone to , it needs to be held in place with a . Sprains . These involve damage to , usually caused by . Sprains are most common in the , knees and wrists . Muscle . These consist of an involuntary and prolonged muscle . Caused by excessive or bad .