=Prognosis.= The prognosis is favourable, for, provided there has been only a moderate strain of the tendons or isolated injury to the muscles, recovery is almost certain. =Treatment.= Treatment consists in resting the animal and in assisting repair. The parts can be immobilised by the application of a vesicant or mild blister. A week or ten days later dry friction, muscular and periarticular massage are indicated, and gentle exercise should be commenced. The same treatment may be employed in strain of the elbow joint and in strains of muscles or tendons in the neighbourhood of joints. Such lesions are, however, very rare in the ox. STRAIN OF THE KNEE. Strain of the knee is commoner in the ox than in the horse, because of the special conformation of the knee in the ox and the mode of working under a yoke. This mode of working gives less individual liberty to the fore quarters, and sometimes interferes with the animal’s efforts when moving a load. Strains of ligaments and periarticular injuries occur as a general rule on the inner side of the limb. =The symptoms= consist in lameness, exaggerated sensibility on pressure, pain on forced flexion of the knee, and swelling of the entire periarticular region. =The prognosis= is somewhat serious in working oxen. =Treatment=, when applicable, should consist of stimulant dressings, massage, and douches. STRAIN OF THE FETLOCK. This is one of the commonest accidents of draught oxen. =Causation.= Working on rough, irregular, rocky ground, or on roads with deep ruts, is the commonest cause of this condition. When the animal moves on irregular surfaces the two claws do not bear an equal share of weight; sometimes the whole weight is for a moment thrown on one claw. The phalanges, therefore, are displaced inwards or outwards, or are twisted around their vertical axis, causing the fetlock joint and its supporting ligaments to be more or less severely strained. The internal or external ligaments of the joint or the suspensory ligament or flexor tendons may even be lacerated. The fetlock may also be strained by the animal making violent efforts to free the claws or pastern which have become fixed in a hole in the ground, in bogging, in hobbling, or in leaping a fence. =Symptoms.= Lameness is noticeable from the beginning, but is unaccompanied by any visible lesion. On examination of the limb, the entire region from the fetlock downwards is found to be sensitive to pressure, and painful when forcibly extended or flexed from side to side. This sensitiveness is particularly marked when the phalanges are rotated on the shank. A few days later the entire fetlock becomes the seat of diffused swelling. =Diagnosis= is facilitated by the fact that the fetlock has an entirely different appearance from that seen when tendon sheaths or the synovial capsules of joints are distended.