Hi, thanks for writing to HCM.
In general, Intra-articular fractures (fractures within the joint) tend to produce certain amount of stiffness
in the joint post operatively. This is especially true in the knee joint. This can be attributed to the soft tissue contractures
that develop during the immobilization period.
So, the only possible way to deal with the problem is by undergoing vigorous physiotherapy
in the immediate post operative period.
As 5 months have elapsed from the time of surgery, I don't think that you can regain any extra range of motion by physiotherapy.
Hope this information is helpful. Good day