Overview
Partial meniscectomy removes the torn, unstable part of a meniscus that cannot heal, leaving the stable rim behind. The loose flap or fragment is what catches, locks and hurts; once it is trimmed to a smooth, stable edge the mechanical symptoms stop, usually within days. Dr. O'Donnell removes as little tissue as possible, because the remaining meniscus is what protects the joint from arthritis, and repairs the tear instead whenever it can heal.
The operation is arthroscopic, takes about 30 minutes, and is done as an outpatient at Bayside Surgery Center. Patients walk out the same day and most are back to full activity in 4 to 6 weeks.
Who It's For
Trimming is the right operation for a meniscus tear that cannot heal and is causing mechanical symptoms: flap, complex, horizontal or degenerative tears in the inner two-thirds of the meniscus, where there is no blood supply, that catch, lock or produce joint-line pain with twisting. A knee locked short of full extension by a displaced fragment, confirmed on exam and MRI, is usually treated promptly. It is also the fallback when a repair attempted for a tear near the rim is not possible because of tissue quality.
Two groups are better served another way. Traumatic longitudinal or bucket-handle tears in the vascular outer third, especially in patients under 40 or alongside an ACL reconstruction, are generally treated with meniscus repair rather than trimmed. And a degenerative tear in a patient over about 45 without locking should be treated with 6 to 12 weeks of rehabilitation first: several large trials have shown that physical therapy matches arthroscopy for these tears, and when X-rays show arthritis in the same compartment, trimming the meniscus does not relieve the arthritic pain and can speed its progression.
A tear on MRI does not on its own justify trimming it. Dr. O'Donnell recommends partial meniscectomy when the catching or locking, the joint-line tenderness and McMurray test on exam, and the tear on MRI all agree, and, for degenerative tears, when a course of rehabilitation has not settled the knee. See the meniscus tear page for how a finding is judged against the symptoms.
What the Procedure Involves
Under a nerve block plus general anesthesia, or sedation for some patients, the arthroscope is placed through two small portals at the front of the knee. The whole joint is inspected, the cartilage surfaces are graded, and the tear is probed to confirm that it is unstable and not repairable. Using a small punch and a motorized shaver, Dr. O'Donnell removes the torn fragment back to stable tissue and contours the edge so that nothing catches when the knee is bent and rotated under the camera. Loose bodies are retrieved and any unstable cartilage flap is smoothed at the same time. The rim of the meniscus and its attachment to the capsule are left intact. The portals are closed with a stitch or tape, a compressive dressing is applied, and the patient goes home the same day, walking with weight bearing as tolerated.
Risks & How They Are Minimized
Partial meniscectomy is one of the safest operations in orthopaedics, and the risks are those of any knee arthroscopy. Infection is rare and is guarded against with a pre-incision antibiotic and small, closed portals. Deep-vein thrombosis is uncommon and is addressed with walking from the day of surgery and aspirin for 14 days in patients with risk factors. Persistent swelling is the most common problem and is the main limiter of early progress; it is managed with ice, elevation, compression and by not returning to impact before it resolves. Numbness around a portal from a small skin nerve branch is occasional and usually fades. The long-term consideration is arthritis in the trimmed compartment, which is why the resection is kept to the unstable fragment, the rim is preserved, and patients with existing arthritis are counseled that the operation treats the catching, not the arthritis.
Recovery & Rehabilitation
Because the torn tissue is removed rather than repaired, nothing needs to heal and rehabilitation is accelerated. Weight bearing is as tolerated from the first day, with crutches only until the limp is gone, and motion is advanced as swelling and comfort allow. Swelling is the main limiter of progress, so ice and elevation matter more than exercises in the first days.
| Phase | Timing | What happens |
|---|---|---|
| Early motion & weight bearing | Week 0–1 | Weight bearing as tolerated; crutches weaned as gait normalizes. Quad sets, straight-leg raises, range of motion as tolerated, patellar mobilizations, ankle pumps, stationary bike as motion allows. Avoid deep flexion under load. Advance with full extension, a good quad set and minimal swelling. |
| Motion & strength | Weeks 1–3 | Full range of motion. Mini-squats, leg press, bridges, balance and proprioception, bike and low-impact conditioning. Advance with full pain-free motion and a normal gait without crutches. |
| Return to activity | Weeks 3–6 | Progressive resistive strengthening, running and agility progression as tolerated, sport-specific drills. Return to sport typically at 4 to 6 weeks with symmetric strength and no swelling with activity. |
Desk work is possible within 2 to 3 days. Driving resumes once off crutches and off narcotic pain medication, usually within the first week for a right knee. Cycling and swimming from about 2 weeks, running from about 3 weeks as swelling allows, and cutting sport at 4 to 6 weeks.
Protocol summary
Precautions: weight bearing as tolerated from the day of surgery, with crutches only until gait is no longer antalgic; control swelling, which is the main limiter of early progress; avoid deep squatting and high-impact activity until swelling resolves and strength returns.
Criteria: the first phase ends with full extension, a good quad set and minimal swelling; strengthening advances with full pain-free range of motion and a normal gait without crutches; return to sport requires symmetric strength and no swelling with activity, typically at 4 to 6 weeks.
Physical Therapy Protocol
Partial Meniscectomy PDF ↗Frequently Asked Questions
How long does it take to recover from a partial meniscectomy?
Most patients walk without crutches within a few days, are back at a desk in 2 to 3 days, and return to full activity including running and sport at 4 to 6 weeks. The pace is set by swelling rather than by healing, since nothing was repaired. Knees with some arthritis in the same compartment take longer to settle.
Can I walk right after meniscus surgery?
Yes. Weight bearing as tolerated is allowed from the day of surgery, and crutches are used only until you can walk without a limp, typically a few days. Ice, elevation and short walks in the first days control swelling better than long periods on your feet.
Is it better to have a meniscus tear trimmed or repaired?
Repaired, when it can heal. Tears in the vascular outer third with healthy tissue are stitched; tears in the inner zone, and degenerative or complex tears, cannot heal and are trimmed. Trimming gives a fast recovery but leaves less meniscus to protect the joint, so Dr. O'Donnell removes only the unstable fragment. The final decision is made at arthroscopy when the tear is probed.
When can I drive after a partial meniscectomy?
Once you are off crutches, off narcotic pain medication and can brake hard without hesitation. For a right knee that is usually within the first week; for a left knee with an automatic transmission, often within a couple of days.
Will I get arthritis after a partial meniscectomy?
Removing meniscus tissue raises the load on the cartilage beneath it, and over decades that increases the risk of arthritis in that compartment. The risk rises with the amount removed, which is why the resection is limited to the unstable fragment and the rim is preserved. A knee that already has arthritis on X-ray is the one most likely to keep hurting, and those patients are advised to try rehabilitation first.
This page is for general education and is not a substitute for a medical evaluation. The right procedure depends on your individual diagnosis, anatomy, and goals. Kevin O'Donnell, MD sees patients from Coral Gables, Miami, Brickell, Pinecrest and Coconut Grove at 475 Biltmore Way, and out-of-town patients by telemedicine.