The tibial plateau is at the top of the lower leg bone (the tibia). It’s the surface where the thighbone attaches to the lower leg bone to form the knee joint.
The risk of problems is greater when surgery is done. There can be poor wound healing, infection, blood clots, and dislocation of the kneecap. If the break is deep enough, it can affect the joint. Arthritis can develop early, requiring a knee joint replacement. Often, more than one operation is needed.
Treatment without surgery suggests a less serious problem with a better outcome. The stiffness could lead to joint fusion over time. Most likely, with exercise and a rehab program, your range of motion will be restored fully.