Correction of Bilateral Knee Valgus (Knock-knee) with Osteotomy and Plate Insertion

Doctor: S. Robert Rozbruch

Patient: Yang

Yang is an athletic young man who was having difficulties related to his knock-knees including pain and awkward gait. He was also concerned with the aesthetics and about further degeneration of the knee in the future.

Staged bilateral surgery was performed. Crutches were used for 6 weeks after surgery, and then he began normal walking.

Now with well healed bones and straight legs, Yang has improved his athletics and is without pain. He is very happy with the new appearance and is pleased that the normal alignment helps protect his knees from developing degenerative arthritis in the future.



With knock-knees, the lateral joint compartment is overloaded causing pain and progressive degeneration. Notice the line drawn from hip to ankle passes outside to the center of the knee. (Figures 1, 2, 2b, 3)


In the staged bilateral surgery, the left side was approached first with an open wedge osteotomy. A partial bone cut was made and the lateral cortex was shimmed open (Figure 4). The alignment was checked in the OR (Figure 5). The new position was secured with a titanium plate (Figure 6) and the space was filled with synthetic bone graft.




Yang's athletics have improved, he is without pain and happy with his new appearance. His now normal alignment helps protect his knees from developing degenerative arthritis in the future. Notice that the hip to ankle lines pass through the knee center. The two plates were removed one year later during an ambulatory surgery and he was walking the same day. (Figures 7, 8, 9, 10, 11)