IN THE course of routine pediatric practice, many physiological phenomena are observed that seem to be common knowledge but are actually poorly recorded. An example is the presence of knock-knees between the ages of 1 and 6 years. I was unable to find any definite discussion of this in several textbooks of pediatrics1 or in a survey of the literature.
Because of the ever increasing practice of preventive medicine, these minor points become more important, in the instance of knock-knee for several reasons: First, the practitioner should know that "knock-knee" is normal and to what degree he may consider it to be physiological. Second, there should be a fairly accurate
technique of measuring the distance between the medial malleoli in order that one can determine the need for treatment of pathological knock-knee. If some therapy is indicated, then comparative figures would give the physician an index as to the