Adults with degenerative meniscal tear receiving arthroscopic surgical management or knee drainage (arthrocentesis) +/- intra-articular steroid injection will be recruited to this non-interventional cohort study. The aim is to investigate whether measurement of an individual's synovial fluid biomarker response to a degenerative meniscal tear with symptoms predicts symptomatic and functional outcome suggestive of osteoarthritis (OA) of the knee.