What are the symptoms of having a meniscus displacement tear of the root? Is surgery the only options? I have slipping and instability of the knee.

Symptoms can vary. Your symptoms can range from nothing to mechanical with or without pain. Mechanical symptoms can present as having a sense of catching or locking as if something is getting stuck. Some can get a sense of instability. Depending on your symptoms and age a variety of interventions can be tried ranging from nonoperative to operative. Based on your symptoms surgery would be recommended.