Is complete tear of proximal third of the acl with ligament laxity very serious ? do i need surgery ? or can it be strengthern by exercise and physio

Probably surgery: Acl tears themselves usually do not heal, and the acl is a very important part of the stabilizers of the knee. There is a fairly small benefit strengthening the leg. Most people either have to accept that they will have to have a fairly inactive lifestyle, perhaps with a brace, or they will have to have it fixed. Thank you for your question.

Most choose surgery: Sugical reconstruction is the most common treatment, although some will elect to only treat with physical thearpy. When pursuing surgery there are many graft options, but despite which one the surgeon may use the procedure includes putting tunnels in the bones of the knee and threading the graft through to replace the original ligament. Trying to reconnect the ends of the original lig doesn't work.