Is this normal, knee felt like giving way and sharp pain on lower outer edge(new to this area). i'm being treated at pt for pain on the inside edge of same knee. dr referring says plica or inner knee derangement or pes ansine buritis or meniscus tear?

A plica or pes anserine bursitis tend to cause pain on the inside of the knee. These are often associated with overuse or repetitive activities. Internal derangement is a general term for problems inside the knee joint. This would include meniscal tears, ligament tears, loose bodies in the joint, as well as arthritis. PT has been shown to help with many knee problems, but if not better follow-up.