The age range of the patients extended from two and three-quarters to twelve and one-half years. In at least three of the patients there was a family history of pulmonary tuberculosis. The duration of the disease varied from one to ten years, being of greater duration in the older patients. The tuberculin test, guinea-pig test, and microscopic findings were fairly uniform at the time of operation; and it is of interest that they were positive even in the older patients. It usually required two operations before a firm, osseous ankylosis took place. It required a longer period in the younger patients than in the older to secure ankylosis. The average time required for bony union in all the patients was about two years. There was no loss of growth in the majority of the patients, and when it did occur it was not more than one-half inch. In some of the patients there was a lengthening after operation due to stimulation of the epiphyseal cartilage plate.