Pain in the leg. Pantoprazole, ssri etc?

My mother who is 52 years old had a fall last night due to slippery floor. She bent her left leg completely during the fall and now it hurts. Whenever she gets up from chair, it hurts a lot and it also hurts to bend the leg. So as initial treatment, I would like to manage her pain with Tramadol. Nsaids she can't take as it causes her immediate gastritis. This morning I gave her (Tramadol 37.5mg + paracetamol 325mg) . For how many days I can safely continue to give her Tramadol? And what dosage is safest for each day ensuring no withdrawal effects occur later on. We are not worried of addictive potential but rather more worried of side effects on other organs. Is Tramadol as safe as some allopathic drugs like pantoprazole, ssri etc? Which people take for years. Some years ago an orthopedist advised her against bending as her cartilage is already compromised . Its not a complete osteoarthritis needing knee replacement but it's in mild stage. And last night leg got bent which now hurts.