As you have just started walking full weight bearing your shoulder blade might go up due to pain and apprehension that’s completely normal, no need to worry.

Need to see your all xray and walking pattern

Usually after intraarticular fractures like proximal tibia fractures patients receive a brief period of non weight bearing to protect the fixed fracture Because of that once you restart waking you may feel uncomfortable So it’s advisable to start doing physiotherapy and gait training for the same

After proximal tibia surgery, it is common to have an abnormal walking pattern for some time even after you are allowed full weight bearing. The shoulder moving upward while walking is usually due to compensatory/antalgic gait, often from weakness of the quadriceps and hip muscles, knee stiffness, pain, or the habit of protecting the operated leg during the previous few months. It does not necessarily mean there is a problem with the shoulder.

Get checked by ortho for your gait issues. Also take training from physio. Mostly your issue is connected to abnormal posture while walking

Continue exercises and physiotherapy if any queries please contact your primary surgeon