Hello there
Well your mother has considerable problem in the knee....the ACL is grade 2 tear and even posterior horn of Medial meniscas has a tear.......
Please visit a reputed knee arthoscopic surgeon,your mother requires arthroscopic repair of the concerned structures in her knee.
Till that time please dont bear weight on that knee.
If any other doubts do get back.
Regards
Next Steps
Dr.Raviraj Francis
MPTh(Rehab).MPT(MSk).UK