1. There are three distinct types of arthritis: infectious, atrophic, and hypertrophic.
2. These types differ etiologically, pathologically, and clinically, and in x-rays.
3. They respond to treatment differently and should, therefore, be differentiated.
4. Clinical data seem valueless unless these types are studied as separate pathological entities.
(C) 1922 All Rights Reserved.The Journal of Bone and Joint Surgery, Inc.