One of the primary reasons for performing arthroscopies is to repair or trim a painful and torn or damaged meniscus. The technical terms for the surgery is arthroscopic partial meniscectomy (APM). Arthroscopic surgery, however, does not appear to result in benefits to adults when performed for knee pain in patients with osteoarthritis who have a meniscal tear. This may be due to the fact that a torn meniscus may often not cause pain and symptoms, which may be caused by the osteoarthritis alone. Some groups have made a strong recommendation against arthroscopic partial meniscectomy in nearly all patients, stating that the only group of patients who may - or may not - benefit are those with a true locked knee. Professional knee societies, however, highlight other symptoms and related factors they believe are important, and continue to support limited use of arthroscopic partial meniscectomy in carefully selected patients.