10-Year Study Questions Benefits of Common Knee Surgery

A landmark 10-year study found that arthroscopic partial meniscectomy offered no lasting advantage over placebo surgery for many patients with degenerative meniscus tears and may be linked to worse long-term outcomes. NMK-Studio/Shutterstock

Arthroscopic partial meniscectomy has been one of the most common orthopedic procedures for adults with knee pain caused by degenerative meniscus tears. Many patients have undergone the minimally invasive surgery hoping for lasting pain relief, better mobility, and a return to normal activities. However, new long-term research is challenging those expectations and raising important questions about whether the procedure delivers meaningful benefits for many people. If you’re considering surgery for a torn meniscus (or simply want to understand the latest evidence), you may want to discuss the latest findings with your doctor. Here’s what you need to know.

A Decade of Research Offers a Clearer Picture

Researchers recently published the 10-year follow-up from the Finnish Degenerative Meniscus Lesion Study (FIDELITY), one of the most influential trials examining arthroscopic partial meniscectomy for degenerative meniscus tears. In the original study, patients were randomly assigned to receive either the actual surgery or a sham procedure designed to mimic surgery without removing any tissue. After a decade of follow-up, researchers found no meaningful long-term benefit from the surgery compared with the placebo procedure for pain relief or knee function. Even more concerning, patients who underwent surgery showed signs of greater osteoarthritis progression and were more likely to require additional knee procedures over time.

Important: This study evaluated degenerative meniscus tears, which are the type that develop gradually with age and wear. It does not include acute traumatic tears caused by sports injuries, falls, or other sudden accidents. People with locked knees, certain unstable tears, or other structural knee injuries may still benefit from surgery, depending on their individual circumstances.

Who Should Pay Attention to These Findings?

These results are most relevant to:

Adults over 40 with gradual knee pain.
Degenerative meniscus tears seen on MRI.
Patients considering arthroscopic partial meniscectomy primarily for pain relief.

The findings may not apply to:

Athletes with traumatic tears.
Bucket-handle tears causing a locked knee.
Major ligament injuries.
Meniscus repairs rather than meniscus trimming.

The Surgery in Question Is Extremely Common

The procedure evaluated in the study is called arthroscopic partial meniscectomy, a minimally invasive surgery used to trim damaged portions of the knee’s meniscus. It has long been recommended for middle-aged and older adults experiencing pain from degenerative meniscal tears, particularly when imaging shows wear and tear inside the joint. Because arthroscopy typically requires only small incisions and a relatively quick recovery, many patients view it as a low-risk solution before considering knee replacement. The new findings do not apply to every knee injury, but they do call into question its routine use for age-related degenerative tears. Researchers noted that this operation remains one of the world’s most frequently performed orthopedic procedures despite growing evidence that it may not improve long-term outcomes for many patients.

Why the Findings Matter for Patients

One of the biggest strengths of the FIDELITY study is its unusually long follow-up period. Many surgical studies measure outcomes for one or two years, but degenerative joint disease often develops over much longer periods. By following patients for ten years, researchers were able to evaluate whether any early improvements translated into lasting benefits. Instead, the evidence suggested that patients who underwent surgery experienced similar (or in some cases worse) results than those who underwent the placebo procedure.

The FIDELITY trial is considered especially influential because it compared surgery with a sham procedure rather than simply comparing surgery with no treatment. That design helps researchers determine whether improvements come from the procedure itself or from the placebo effect and natural healing over time. Long-term follow-up also provides a clearer picture of outcomes that shorter studies may miss.

What the Researchers Found

Year 1–2: Little difference between surgery and the placebo procedure.

Year 10: No meaningful long-term improvement in pain or knee function from surgery, with evidence suggesting greater osteoarthritis progression and additional knee procedures among patients who underwent arthroscopic partial meniscectomy.

Physical Therapy May Be a Better First Step for Many

For many adults with degenerative meniscus tears, experts increasingly recommend beginning with conservative treatment rather than immediate surgery. Structured physical therapy, strengthening exercises, weight management when appropriate, anti-inflammatory medications, and activity modification can often improve pain and function without an operation.

Physical therapy isn’t simply “waiting for the knee to heal.” Most programs focus on strengthening the muscles around the knee and hip, improving balance, increasing flexibility, and restoring normal movement patterns. For many patients with degenerative meniscus tears, these improvements can reduce pain and improve function without surgery.

Several previous clinical trials have also found that physical therapy performs as well as arthroscopic surgery for many patients with degenerative knee conditions. Every knee injury is different, however, and some patients, particularly those with true mechanical locking, traumatic tears, or certain structural injuries, may still benefit from surgical treatment.

Questions to Ask Before Scheduling Knee Surgery

If you’ve been told you need arthroscopic surgery for a degenerative meniscus tear, it’s reasonable to ask your orthopedic surgeon several important questions. Find out whether your symptoms are most likely caused by the meniscus tear itself or by underlying osteoarthritis, since imaging findings don’t always explain knee pain. Ask whether you’ve completed an adequate course of physical therapy and whether additional conservative treatments might still help. You should also discuss the expected benefits, recovery timeline, possible complications, and whether your specific situation differs from the patients studied in the FIDELITY trial.

Nonsurgical Options to Ask About

Before scheduling surgery, ask your healthcare provider whether these options are appropriate:

Structured physical therapy.
Weight management, if excess weight is contributing to knee stress.
Activity modification.
Anti-inflammatory medications, when appropriate.
Bracing or assistive devices.
Corticosteroid or other injections, if recommended.

The Best Treatment Starts With the Right Diagnosis

This study doesn’t suggest that knee surgery is unnecessary for everyone. It suggests that the right treatment depends on the type of meniscus tear and the individual patient. For many people with age-related degenerative tears, conservative treatments such as physical therapy may provide similar long-term results while avoiding the risks associated with surgery. Before deciding on an operation, talk with your orthopedic specialist about whether your symptoms, imaging findings, and goals match the patients included in this research. An informed conversation (not a one-size-fits-all approach) is still the best path to choosing the right treatment.

Have you or someone you know undergone arthroscopic knee surgery for a meniscus tear? Share your experience and whether it helped in the comments below.