Please select the eligibility criteria that correspond to the clinical trial below.
Title: Knee Arthroscopy Cohort Southern Denmark (KACS)
Brief Summary: PURPOSE: To investigate the natural time course of patient-reported outcomes after meniscus surgery and identify factors associated with good and bad outcome after surgery.


Options:
A: Inclusion Criteria:

* Adults aged 18 to 40 years with knee pain
* Clinical history and symptoms consistent with meniscal tear and meniscal tear verified on magnetic resonance imaging (MRI)
* Deemed eligible for meniscal surgery (i.e. repair or resection) by the examining orthopedic surgeon
* Willing to participate in 12 weeks of supervised exercise twice a week or undergo surgery for the meniscal tear as soon as possible

Exclusion Criteria:

* Previous knee surgery on the affected knee
* Clinical suspicion (acute locking of knee AND/OR extension deficit) of displaced bucket-handle tear confirmed by MRI
* Fracture of the affected extremity within the previous 12 months
* Complete rupture of one or more knee ligaments.
* Participation in supervised systematic exercise for knee problems within the last 3 months prior to recruitment
* Other reasons for exclusion (Unable to understand Danish, mentally unable to participate, etc.)
B: Inclusion Criteria:

* Assigned for arthroscopy on suspicion of a medial and/or lateral meniscus tear.
* Age \>18 years at time of recruitment
* Having an email address
* Able to read and understand Danish

Exclusion Criteria:

* Patients who will or have previously undergone surgical reconstruction of the anterior or posterior cruciate ligament (ACL or PCL) in either knee
* Fracture to the lower extremities (i.e. hip, leg or foot) in either leg within the last 6 months prior to recruitment
* Not mentally able to reply to the questionnaire
C: Inclusion Criteria:

1. Age: 35 to 65 years of age.
2. A pain located on the medial joint line of the knee that has persistent at least for 3 months.
3. Pain that can be provoked by palpation or compression of the joint line or a positive McMurray sign.
4. Tear of the medial meniscus on MRI.
5. Degenerative rupture of the medial meniscus confirmed at arthroscopy.

Exclusion Criteria:

1. Acute, trauma-induced onset of symptoms.
2. Locking or painful snapping of the knee joint.
3. A surgical operation performed on the affected knee.
4. Osteoarthritis of the medial compartment of the knee (determined by clinical criteria of the ACR).
5. Osteoarthritis on knee radiographs (Kellgren-Lawrence \> 1).
6. Acute (within the previous year) fractures of the knee.
7. Decreased range of motion of the knee.
8. Instability of the knee.
9. MRI assessment showing a tumor or any other complaint requiring surgical or other means of treatment.
10. Arthroscopic assessment showing anything other than a degenerative tear of the medial meniscus requiring surgical intervention.
D: Inclusion Criteria:

* OA symptoms lasting at least 1 month and managed with medications, activity limitations, and/or physical therapy
* At least one symptom consistent with a torn meniscus. Symptoms may include clicking, catching, popping, giving way, pain with pivot or torque, episodic pain, and/or pain that is acute and localized to one joint line.
* Available knee X-ray (within 6 months) and MRI (within 3 years)
* Evidence of osteophyte formation or cartilage fissure, tear, or loss on a knee MRI OR plain radiographic evidence of osteophyte formation or joint space narrowing
* Evidence of a meniscal tear (tear extending to surface of meniscus) on a knee MRI
* Willingness to undergo random assignment and sign an informed consent

Exclusion Criteria:

* Chronically locked knee
* Kellgren-Lawrence Grade IV status, indicating advanced OA and usually the need for total knee replacement
* Contraindication to MRI
* Radiographic chondrocalcinosis (a condition in which there are deposits of calcium pyrophosphate dihydrate \[CPPD\] crystals in one or more joints that eventually result in damage to the affected joints) AND acute symptomatic pseudogout
* Inflammatory diseases (e.g., rheumatoid arthritis, psoriatic arthritis, systemic lupus erythematosus, gout, pseudogout)
* Injection with viscosupplementation in the affected knee in the 4 weeks before study entry
* Any medical contraindications to surgery or physical therapy
* Both knees are symptomatic for meniscal tears and a candidate for bilateral APMs
* Prior surgery on an affected knee
* Pregnancy or possible pregnancy
* Claim filed for worker's compensation
* Unable or unwilling to give informed consent
* Unable or unwilling to attend physical therapy sessions at designated locations or in the community

Answer: B