1. Clinical evidence in support of Wolff's law as originally propounded has been cited.
2. Jansen's contention that tension always produces bone atrophy is not substantiated, and his proposal that Wolff's law be modified accordingly is unwarranted.
3. A bone graft will survive and will continue to hypertrophy, although under constant tension.
(C) 1940 All Rights Reserved.The Journal of Bone and Joint Surgery, Inc.