الفهرس 
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Abstract
CDK is the term that includes all knees presenting immediately after birth with hyperextended knee and failure to achieve full flexion rang. Its incidence is very low i.e.80 times less than CDH or 0.017/1000 live births with female predominance. Other entities are to be recognized as differential diagnosis to CDK because of their postnatal presentation with a recurvatum knee, namely: 1-Congenital snapping knee or congenital tibiofemoral subluxation. 2-Traumatic separation of lower femoral epiphysis .and 3 - Simple genu recurvatum. The aim of the study is to reach the best method in treating this anomaly either :1- Conservatively by manipulation with or without casting or by using a Pavlik harness or2- Operative treatment and whether quadriceps plasty procedure is sufficient to achieve reduction or there is need for distal mobilization of the mass of the quadriceps, also confirm the pathological finding associated with this anomaly as quadriceps fibrosis, its adherence by fibrous tissue, anterior displacement of the medial hamstring tendons and their perverted action leading to hyperextension at the knees, the presence or absence of the anterior cruciate ligament and other pathology in the posterior cruciate ligament, menisci and collateral ligaments.