A far commoner deformity than the preceding is that known as knock-knee (or Genu Valgum).
Flat-foot is often associated with knock-knee in children and young adults who are the subject of rickets.
There may be knock-knee on the one side and bow-knee on the other.
If allowed to unite with the condyle displaced, the articular surface is oblique and bow- or knock-knee results.
Laxity of the ligaments and knock-knee are predisposing factors.
In oblique fracture a gliding displacement is liable to occur and cause bow- or knock-knee.
A deformity of the legs in which the knees are abnormally close together and the ankles are spread widely apart.