Tibial Osteotomy with Open Wedge
What it is
This surgical procedure is used in cases where osteoarthritis has affected only one side of the knee joint. The tibia is cut and realigned so that pressure is shifted from the damaged side of the knee joint to the healthier side.
The tibia is cut at an angle and the two sides are separated to create a wedge-shaped opening.
Source from AAOS, Viewmedica, WebMD