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The Journal of Bone and Joint Surgery, Vol 60, Issue 5 679-680, Copyright © 1978 by Journal of Bone and Joint Surgery, Inc

JOURNAL CONTENTS

The snapping knee of infancy

RK Beals

Three infants with generalized joint laxity and a negative family history had painful episodes of snapping of one or both knees caused by involuntary, momentary lateral subluxation of the tibia. These episodes of subluxation appeared to be due to involuntary contraction of the biceps femoris muscle. Older children learned to produce the phenomenon voluntarily. Treatment should be symptomatic, since the two children who were followed gradually stopped having involuntary subluxations.
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