I have a patient with ACL injury a month ago after that he goes under surgery for ACL reconstruction right now he can perform all the range of motion of Lower limb he can band his knee upto 100degree and can walk with FWB .however,his knee is slightly band around 5-10 degree he can extend with putting effort but is get slughtly band during resting position he might have extension lag what is the best physiotherapy treatment protocol for that