In consequence of severe exertion, some of the fibres of a muscle or of its tendon may be ruptured. This is what is termed a strain. Hot fomentations should be applied, and the injured part kept at rest. If necessary, large adhesive straps should be applied over the injured part to keep it quiet. Sometimes complete rupture of the tendon occurs. This is most likely to occur in the largest tendon of the body, that known as the tendo Achillis, which connects the muscles of the calf to the heel bone.

In treating this accident, a slipper should be placed upon the foot, to the heel of which a strap is attached. The upper end of the strap should be attached above the knee in such a way as to extend the foot completely and partly flex the leg.