There are several non-operative, conservative options to consider for treatment of a meniscus tear or ACL damage to the knee:
Lifestyle Modification. Weight loss, modification of exercise, and avoidance of aggravating activities can prevent further injury.
Rehabilitation. Specifically prescribed exercises can improve strength and flexibility in the quadriceps and hamstring muscles.
Anti-inflammatory Medications. Decrease swelling in the joint and provide temporary relief of pain. Please note, however, that all medications have risks and should be taken only in consultation with your pharmacist and physician.
Bracing. A sleeve like brace that fits firmly around the knee can provide support.