Rupture of muscles and avulsion of their attachments have been liberally dealt with in medical literature and have received consideration in regard to diagnosis, prognosis and treatment. Muscle tears, i. e., injuries of the muscle substance with little disturbance of the continuity of the muscle, have been treated very sparingly; they have either remained unrecognized or have been taken lightly and disregarded. They are more common than reports indicate and deserve attention.
Muscle tears occur more frequently in man than in woman, apparently because the occupations of men cause them to be more exposed to injuries. They are more prone to happen in persons above 40 years of age, when the body elasticity and resiliency have lessened. Certain muscles tear in the course of definite occupations, viz.: the adductors of the thigh in horseriders, the neck muscles in load carriers, the calf group of muscles in mountain climbers, runners