Recently Through MRI, Results State: Tricompartmental Chondromalacia, Most Prominent Involving

Recently through MRI, results state: Tricompartmental chondromalacia, most prominent involving the medial compartment and patella femoral joint. I'm guessing this is just arthritis. But I also have "clicking" on the outside of LT knee when decending the stairs, this is not painful, but is a new symptom. Thank you for explaining the technical terms...