Knee arthroscopy is the most common orthopedic procedure in the United States, with hundreds of thousands performed each year. The technique uses a tiny camera and instruments through small incisions to diagnose and treat a wide range of knee problems. Knee arthroscopy is most often performed for meniscus tears, loose bodies, cartilage damage, and ligament reconstructions, although the role of arthroscopy for arthritis has narrowed substantially as evidence has accumulated. This guide covers the procedure, what conditions benefit from it, and what to expect during recovery.
What Knee Arthroscopy Is and Who Needs It
Arthroscopy uses a fiber-optic camera (arthroscope) inserted through a small incision (portal) to visualize the inside of the joint. Additional portals allow the surgeon to introduce instruments to remove, repair, or reconstruct tissue. The same equipment is used for diagnostic evaluation and therapeutic procedures, often during the same operation.
Common indications include meniscus tears, ligament reconstructions, loose bodies, synovial plicae, focal cartilage defects, and synovial biopsies. Per AAOS, arthroscopy is no longer recommended as a treatment for arthritis without a specific mechanical problem, based on multiple randomized trials showing no benefit over physical therapy. Mayo Clinic notes that careful patient selection produces consistently good outcomes. For broader knee context, see our Medical Conditions guide.
How the Procedure Is Performed
Knee arthroscopy takes 30 to 90 minutes depending on what is found and what is repaired. General or regional anesthesia is standard, although local anesthesia is used in selected cases. The surgeon makes two to four small incisions (about a quarter inch each), inserts the arthroscope and instruments, and inflates the joint with sterile fluid for visualization.
The systematic exam evaluates the patellofemoral joint, both menisci, both cruciate ligaments, the medial and lateral compartments, and any cartilage surfaces. Therapeutic procedures performed during the same operation may include partial meniscectomy or repair (see our meniscus surgery guide), ACL reconstruction, loose body removal, microfracture, plica resection, or synovectomy. Cleveland Clinic notes most procedures are outpatient.
Preparation and What to Expect on the Day
Preoperative preparation is straightforward for healthy patients. An MRI typically informs the procedure plan, and anesthesia evaluation is standard. Stop NSAIDs and blood thinners as directed by the surgeon. Crutches and a brace may or may not be needed depending on the planned procedure.
On the day, allow three to four hours at the surgery center. Most patients walk within hours of surgery and go home the same day. Pain control combines acetaminophen, NSAIDs, and a short opioid course. The dressing usually stays in place for a day or two before being changed to a small adhesive bandage. Showering is typically allowed within a few days once the portals have sealed.
Recovery Timeline and Rehab
Recovery depends entirely on what was done inside the knee. Diagnostic arthroscopy and simple debridement allow return to daily activities within one to two weeks. Partial meniscectomy patients walk normally within one to two weeks and resume running at four to eight weeks. Meniscus repair, ACL reconstruction, and microfracture all require longer protected weight bearing and slower return to sport (see the relevant guides for specifics).
Swelling and stiffness are common in the first few weeks regardless of what was done. Ice, elevation, and gentle range-of-motion exercises help recovery. Outpatient physical therapy is often recommended for two to six weeks. Return to driving usually occurs within one to two weeks for left knee procedures and slightly later for right knee procedures. AAOS provides exercise progressions for each phase of recovery.
Risks, Complications, and Outcomes
Knee arthroscopy has one of the lowest complication rates in orthopedic surgery. Major complications occur in less than 2 percent of cases. Risks include infection (less than 1 percent), DVT (1 to 2 percent), nerve injury at the portal sites (rare), persistent stiffness, and incomplete relief if the arthroscopy did not address the symptom-generating problem. Hemarthrosis (bleeding into the joint) can also occur but usually resolves on its own.
When to seek emergency care: Call 911 or go to the nearest emergency room if you experience sudden severe shortness of breath or chest pain (possible pulmonary embolism), calf swelling and pain (DVT), heavy incision bleeding, expanding redness with fever above 101 F, or sudden severe knee pain with inability to bear weight after a fall.
Alternatives and When Surgery May Not Be Needed
Many knee problems benefit from non-operative care. Physical therapy, weight loss, NSAIDs, and selective corticosteroid injections often resolve symptoms without surgery. The strongest evidence against arthroscopy is for arthritis without mechanical symptoms: a series of randomized trials in the New England Journal of Medicine showed no benefit over rehab. For knee arthritis, our knee replacement guide covers the eventual surgical option.
Mechanical locking, persistent effusion despite rehab, and clear MRI findings of repairable damage are the strongest indications for arthroscopy. Patients evaluating other minimally invasive procedures may also benefit from our ACL reconstruction guide if a ligament injury is suspected.
Cost Considerations
Knee arthroscopy billed costs typically range from $5,000 to $25,000 without insurance, depending on the facility and what is done. Diagnostic-only arthroscopy is rarely indicated and rarely billed. Ambulatory surgery centers and cash-pay surgical centers have brought all-in prices below $5,000 in some markets for simple procedures. Insured patients commonly pay $500 to $2,500 out of pocket. For strategies on shopping outpatient surgery, see our healthcare costs guide.
Frequently Asked Questions
How long does knee arthroscopy recovery take?
Diagnostic arthroscopy and simple debridement: one to two weeks for daily activities. Partial meniscectomy: four to eight weeks for sport. Repairs and reconstructions: three to six months. The recovery is dictated by what was done inside the joint, not the arthroscopic approach itself.
Is knee arthroscopy effective for arthritis?
Multiple randomized trials show that arthroscopy for arthritis without mechanical symptoms produces no better outcomes than physical therapy. Arthroscopy may still help when there is a specific mechanical problem like a locked meniscus tear in an arthritic knee.
Will I need crutches after knee arthroscopy?
Most patients use crutches for a few days for comfort but bear weight as tolerated. Procedures involving meniscus repair, microfracture, or ligament reconstruction often require longer protected weight bearing.
Can I drive after knee arthroscopy?
Most patients drive within a week for left knee procedures and within one to two weeks for right knee procedures, once off opioids and able to react quickly. Return is delayed for repairs and reconstructions.
What to Discuss With Your Surgeon
Knee arthroscopy is a powerful tool when matched to the right indication. The conversation with your surgeon should clarify whether your symptoms have a mechanical component, what specifically the surgeon plans to do, and what the recovery looks like for that specific procedure. If your knee pain is from arthritis without mechanical symptoms, arthroscopy is unlikely to help and a structured rehab program is a better starting point. For mechanical symptoms or repairable structural damage, arthroscopy remains one of the lowest-risk and most useful procedures in modern orthopedics.