My nephew Efaz had a LH nee ligament operation 03 months back.RH leg was ok, after operation(03 weeks he was in bed) he can not stand.then we visit doctor again & again then they did MRI of LH nee, Spain, and brainand they did nerve system sest, all result was ok.Unfortunately our bangladeshi doctor can not identify where is the problem, why he can not stand with scratch?.Please advise