WBAT is a progressive loading onto the involved leg using your own tolerance to guide the weight-bearing process. Your injury and surgery dictate the starting load percentage. Typically, you begin at 25% of your body weight and then see how your leg reacts to the new stresses. You and your PT will pay attention not only to pain, which is a subjective experience, but also to objective changes in swelling, range of motion, and muscle activity.
Before increasing the WB load, the goal is for your pain levels to be low to zero, swelling low to zero, and maintaining your gains in range of motion, muscle activity, and activities of daily living. Just as in PWB, the systematic progression of WB helps optimize the recovery process and decreases the risk of overloading the leg.