• (n.) A condition in which the knees are bent in so as to touch each other in walking; inknee.
(nok´ne″) a childhood deformity, developing gradually, in which the knees rub together or “knock” in walking and the ankles are far apart; the most common causes are irregularity in growth of the long bones of the lower limb and weak ligaments.
Knock'-knee` noun (Medicine) A condition in which the knees are bent in so as to touch each other in walking; inknee. 
Type: Term Pronunciation: nok′nē Synonyms: genu valgum
[n] - inward slant of the thigh
inward curvature of the legs, causing the knees to knock together in walking. · the knees of a person whose legs have such curvature.