Should I have knee surgery for meniscus tear?
Ross Hauser, MD | Caring Medical Regenerative Medicine Clinics, Fort Myers, Florida
David N. Woznica, MD | Caring Medical Regenerative Medicine Clinics, Oak Park, Illinois
Katherine L. Worsnick, MPAS, PA-C | Caring Medical Regenerative Medicine Clinics, Fort Myers, Florida
Danielle R. Steilen-Matias, MMS, PA-C | Caring Medical Regenerative Medicine Clinics, Oak Park, Illinois
Should I have meniscus surgery ?
One of the most common calls our office receives involves patients who have had part or all of their meniscus removed and are now suffering with continued pain or arthritis as a consequence of the meniscus or multiple meniscus surgeries they have already had.
- What is concerning the most to these patients is that their knee problems came upon them much more quickly than the surgeon’s suggestion that “eventually” they would develop osteoarthritis. “Eventually” for some seemed to come over night.
If you have been given the meniscus injury surgical recommendation, you have been told that you will get one of these three procedures.
- An Arthroscopic meniscus repair. In this procedure there is a small tear that suture can sew up. In some instances surgeons are taking bone marrow from the iliac crest and are using stem cell therapy to accelerate this repair.
- An Arthroscopic partial meniscectomy. In this procedure there is a piece of a meniscus that is more badly torn or macerated (all chewed up) and considered unrepairable. There is basically nothing to stitch up. This piece of the meniscus is recommended for removal because of its condition.
- An Arthroscopic total meniscectomy. The whole meniscus is considered damaged beyond repair and the entire meniscus will be recommended to removal.
What happens when all or part of the meniscus is removed?
As mentioned above, the patient will be told that eventually they will develop knee problems. The long-term side effects of meniscus surgery is that meniscectomies worsen knee joint instability by negatively influencing other supporting knee structures by increasing contact stress on the cartilage. The knee’s house of cards will crumble thereafter as increasing contact stress on the cartilage, increases the risk and occurrences of chronic knee inflammation and accelerates the degenerative knee conditions that lead to knee joint erosion or irreversible joint damage to the knee.
This is the consequence of removing meniscus tissue.
But why did these people have the surgery in the first place? Especially if they were told meniscus surgery could accelerate and cause irreversible knee damage? It is the patient’s belief that the surgical removal of whole or part of the meniscus will restore function and lessen pain
It can be difficult to tell a patient to have patience when there knee hurts. Most of the time when someone comes into our clinics for the first time they will report on the characteristic symptoms of meniscus related knee problems:
- Knee catches and “uncatches,” seemingly at random times. When this happens the patient reports that they simply “shake it out,” by lifting that foot and shaking it.
- Knee locks causing significant pain.
It is also difficult to convince an athlete that meniscus surgery may prevent them from returning to sport all together. At this point we will introduce the research from surgeons as a second opinion to our statements.
Surgeons tell the reasons people come in for meniscus surgery
Doctors writing in the The Journal of the American Academy of Orthopaedic Surgeons (1) offer a very good rationale for why people still have meniscus surgery. Here are some talking points of the research:
- For older patients or those more active patients with developing arthritis, the use of partial meniscectomy to manage degenerative meniscus tears and mechanical symptoms may be beneficial; however, its routine use in the degenerative knee over physical therapy alone is not supported. (Physical therapy has been found to be just as good as the surgery).
- In younger populations (sports minded), partial meniscectomy (removal of meniscus tissue) may provide earlier return to play, and lower revision surgery rate compared with meniscal repair. However, partial meniscectomy may result in earlier development of osteoarthritis.
Evaluating this data, one could imply that:
- Younger patients get the meniscus partial removal surgery because they need to get back to work or back to the game quicker and surgery, despite its drawbacks, gets them there faster. As we will see in the research below this is not grounded in fact, for many people getting this surgery, the situation becomes worse.
- Younger patients may not find the repair surgery appealing because of:
- Longer rehabilitation times
- Risk of needing a second surgery because the first surgery did not fix everything
- Long-term development of osteoarthritis is seen as something that will happen “eventually,” not any time soon.
The surgical realities of meniscus tear surgery – what the United States Military says:
Army physicians from the William Beaumont Army Medical Center and doctors from Rush University Medical Center have published a March 2018 study in the Journal of Knee Surgery.(2)
It reports on how military surgeons dealt with meniscal injury. The report reveals findings on nearly 30,000 meniscus surgeries.
- In 81.3% of patients, a partial meniscectomy was performed.
- In 20.3% a meniscal repair was performed. This is typically limited to the red-zone of the meniscus where ample blood supply allows for suturing and healing.
- Very rarely a meniscus allograft transplantation (cadaver donor) in 0.7% of patients was performed.
- Older patients were more likely to get a meniscectomy and less likely to get a repair.
What are we to make of this?
- In 4 out of 5 patients, meniscus tissue had to be removed.
- In 1 out of 5 patients the injury was fixable because of location and size.
- Meniscus transplant has lost much of its appeal.
- The meniscus is hard to save.
To save the knee, you must save the meniscus. A shift is occurring in meniscus surgery but it is just starting
In the July/August 2018 edition of the medical journal Sports Health,(3) surgeons at UCLA talked about the younger patient and why taking out meniscus tissue is really not optimal.
Here are the talking points:
- “With the rise in sports participation and increased athleticism in the adolescent population, there is an ever-growing need to better understand adolescent meniscus pathology and treatment.”
- “A shift in the management of isolated adolescent meniscal tears is reflected in the literature, with a recent increase in operative repair. This is likely secondary to poor outcomes after meniscectomy reflected in long-term follow-up studies.” (In other words, surgeons need to offer different options because taking out a piece of the meniscus does not offer good outcomes).
- “The current literature highlights the need for improved description of tear patterns, standardized reporting of outcome measures, and improved study methodologies to help guide orthopaedic surgeons on operative treatment of meniscal tears in adolescent patients.”
Basically, surgeons need to repair and save the meniscus. They also need to figure out how to do it.
Doctors in France writing in the medical journal Orthopaedics & traumatology, surgery & research, (4) joined the growing list of doctors rallying under the banner “Save the Meniscus!”
This research asks the same question we do, Why do we still perform meniscectomy?
- The French researchers acknowledge that even in late 2017, meniscectomy remains one of the most frequent orthopedic procedures, despite meniscal sparing techniques having been advocated for several decades now.
Why do we ignore a mountain of clinical and scientific evidence against meniscectomy?
- The French team says the number of meniscectomy is excessive in the light of scientifically robust studies demonstrating the interest of meniscal repair or of non-operative treatment for traumatic tear and of non-operative treatment for degenerative meniscal lesions.
- Meniscectomy was long considered the treatment of choice. All but 1 of the 8 recent randomized studies reported non-superiority of arthroscopy over non-operative treatment, which should thus be the first-line choice, with arthroscopic meniscectomy reserved for cases of failure, or earlier in case of “considerable” mechanical symptoms.
They like us agree, it is high time that the paradigm shifted, in favor of meniscal preservation.
Now, let’s get back to the reasons why you may still be recommended to meniscus surgery
The partial meniscectomy is not that bad
Doctors in Germany say that many of the studies critical of arthroscopic meniscus surgery are not 100% reflective of the patients they see. Medical research is broken up into levels of evidence. Level 1 being base evidence which means a researcher took existing research and combined it into a review of the literature. Doctors and researchers grade this the lowest level of accredited research.
The German doctors say too much level 1 evidence is being offered as a generalization of meniscus surgery. The complaint is some surgeries will help some patients and that every meniscus surgery is not a bad surgery and this research is not reflective of that.
- They also cite that according to the consensus statement of ESSKA the European Society of Sports Traumatology, Knee Surgery and Arthroscopy, meniscus surgery is still recommended.
- So European surgeons have not yet embraced the idea of totally moving away from meniscectomy.
The ESSKA guidelines also say the treatment of degenerative meniscal lesions should start with conservative management. In the case of persistent symptoms, surgery should be considered after 3 months. In the case of mechanical symptoms, arthroscopy might be indicated earlier.
They do say arthroscopy in advanced osteoarthritic knees is not indicated due to inferior clinical outcome.(5)
- So there is a window of who the surgery can help. Unfortunately, this small window is usually left wide open to include patients who do not need the surgery.
The other unfortunate thing is the constant and confusing term “conservative treatments.” Our idea of conservative treatments for meniscus tears is not the same as a surgeons view of what conservative care is.
For us conservative care means regenerative medicine, for surgeons conservative care means treatments such as rest, ice, immobilization, anti-inflammatories, painkillers, Hyaluronic Acid Injections for knee osteoarthritis etc, treatments we already have dismissed as ineffective. This is discussed below.
Arthroscopic meniscus surgery leads to a three-fold increase in the need for knee replacement
In 2017, doctors in the Netherlands published their findings in the medical journal Osteoarthritis Cartilage: (6)
- “In patients with knee osteoarthritis, arthroscopic knee surgery with meniscectomy is associated with a three-fold increase in the risk for future knee replacement surgery.”
November 2016: Research in the medical journal Orthopedics:(7)
- Doctors examine the incidence of total knee arthroplasty (total knee replacement) in patients who have undergone knee arthroscopy for partial meniscectomy, chondroplasty, or arthroscopic debridement of the knee.
- Reported rates of total knee replacement:
- One year: 10.1%
- Two years: 13.7%
- Three years: 15.6%
- Obesity, depressive disorder, rheumatoid arthritis, diabetes, and being age 70 years and older were associated with increased relative risk of conversion to total knee replacement at 2 years.
- When obesity was combined individually with the top 5 other risk factors, no combination produced a higher relative risk than that of obesity alone.
- Patients who were 50 to 54 years of age had the lowest incidence of conversion to total knee replacement.
- Men had a lower incidence of conversion to total knee replacement (11.3%) than women (15.8%).
The study’s doctors suggested that this information can help surgeons to counsel patients on the incidence of total knee replacement after knee arthroscopy and identify preoperative risk factors that increase risk.
Patients undergoing arthroscopic meniscus surgery were too optimistic regarding their recovery time
December 2016: Doctors in Denmark publish these findings:
- “In general, patients undergoing arthroscopic meniscus surgery were too optimistic regarding their recovery time and postoperative participation in leisure activities. This highlights the need for shared decision making which should include giving the patient information on realistic expectations. . . “(8)
Doctors at New York University’s Langone Medical Center investigated the failure rate for surgically repaired bucket-handle meniscus tears at a minimum 2-year follow-up interval. Reporting in the medical journal the Physician and Sports Medicine in May 2017, the doctors looked at 51 patients who experienced bucket-handle meniscus tears that were isolated or occurred with an ACL injury.
- Of the 51 patients that had a bucket-handle meniscal repair, 12 (23.5%) were defined as failures (return of symptoms alongside re-tear in the same zone of the repaired meniscus within two years of surgery). According to the researchers, this is the first study to report outcome scores solely for bucket-handle meniscus repairs, shedding light on the postoperative quality of life of patients with repair success or failure.(9)
Meniscus surgery causes super accelerated knee arthritis.
Do these findings present anything really new? No, research has been ongoing telling patients and doctors of the risks associated with arthroscopic meniscus repair.
It is remarkable that studies more than a decade and a half old have issued the same warnings. In 2005, doctors in Canada audited the effectiveness of certain medical procedures found very poor quality evidence on the effectiveness of arthroscopic debridement of the knee with partial meniscectomy.(10)
The summary of these studies? If you have a meniscus surgery, chances are you will be disappointed in the outcome and then move onto eventual knee replacement.
In research appearing in the medical journal Clinical Anatomy, doctors issued their report on a phenomenon of super-accelerated osteoarthritis in knees with meniscus tear damage and history of surgical meniscus removal.
Coming out of Tufts Medical Center in Boston, the researchers noted that knee osteoarthritis is typically a slow, progressive problem; however, in some patients knees progressed to osteoarthritis with dramatic rapidity. However, clinicians cannot determine which patients may be at risk for accelerated knee osteoarthritis without knowing the incident structural damage that predisposes a knee to accelerated osteoarthritis. The Tuft researchers found that structural damage that is associated with accelerated knee osteoarthritis destabilizes and compromises the function of the meniscus or compromises the subchondral bone.(11)
In an early study researchers from the Department of Orthopaedic Surgery at Carolinas Medical Center found that a damaged meniscus is the active participant in the development of knee osteoarthritis. In the study above, the relationship to bone damage is discussed, in this cited study the Carolinas Medical team found a strong association between meniscus damage and cartilage loss.(12) The two combined studies help confirm missing meniscal tissue contributes to bone and cartilage degeneration.
Meniscus removal throws the whole knee out of balance
Doctors at the Hospital of Special Surgery found that meniscus removal, not only impacts the knee at the point of the surgery but throws the whole knee out of balance and leads to several points of cartilage deterioration.(13)
What is really remarkable is that researchers write paper after paper saying that removal of meniscal tissue in surgery causes advanced osteoarthritis and the procedures continue.
Clearly, the best way to prevent cartilage breakdown and knee osteoarthritis caused by meniscal surgery is to AVOID the surgery.
Dr. Gordon H. Guyatt, a professor of medicine and epidemiology at McMaster University in Hamilton, Ontario, who wrote (an) editorial in The British Medical Journal, which he called arthroscopic meniscal surgery “A highly questionable practice without supporting evidence of even moderate quality.”
Dr. Guyatt was quoted in the Times “I personally think the operation should not be mentioned (to the patient as an option),” he says, adding that in his opinion the studies indicate the pain relief after surgery is a placebo effect. But if a doctor says anything, Dr. Guyatt suggests saying this:
“We have randomized clinical trials that produce the highest quality of evidence. They strongly suggest that the procedure is next to useless. If there is any benefit, it is very small and there are downsides, expense, and potential complications.”
Hearing that, he says, “I cannot imagine that anybody would say, ‘Go ahead. I will go for it.’”
Nearly twenty years ago in the first edition of our book Prolo Your Pain Away – we told patients that if the surgeon removes the meniscus, arthritis is the end result. Further, since the meniscus aids in the stability of the knee, if removed the knee is left with too much motion and becomes unstable.
Arthroscopic Partial Meniscectomy versus Sham Surgery for a Degenerative Meniscus Tear – Surgery does not alleviate knee catching or knee locking after surgery
The research mentioned above and reported by the New York Times was not the first time the meniscus surgery controversy was reported in the mainstream media. On December 24, 2013, the New England Journal of Medicine published an article entitled “Arthroscopic Partial Meniscectomy versus Sham Surgery for a Degenerative Meniscal Tear.”
This was the work of Finnish researchers who recognized that arthroscopic partial meniscectomy is one of the most common orthopedic procedures, yet rigorous evidence of its efficacy is lacking.
So what they did was to conduct a multicenter, randomized, double-blind, sham-controlled trial in 146 patients 35 to 65 years of age who had knee symptoms consistent with a degenerative medial meniscus tear and no knee osteoarthritis.
Patients were randomly assigned to arthroscopic partial meniscectomy or sham surgery. Then a scoring system was designed to measure pain, symptom severity, and knee pain after exercise at 12 months after the procedure.
What they found was “In this trial involving patients without knee osteoarthritis but with symptoms of a degenerative medial meniscus tear, the outcomes after arthroscopic partial meniscectomy were no better than those after a sham surgical procedure.”
Earlier in 2013 research published in the American Journal of Sports Medicine showed what little value meniscectomy has. Researchers compared meniscectomy to nonoperative treatment for meniscus tears.(14)
They specifically studied degenerative horizontal tears of the medial meniscus and hypothesized that surgical treatment would produce better outcomes than nonoperative strengthening exercises.
This study was a randomized controlled trial with the highest level of evidence (level 1). The study had 102 patients with medial meniscus tears – 81 women and 21 men with the average age of 53.8.
Fifty patients underwent arthroscopic meniscectomy while 52 participated in nonoperative strengthening exercises. The results did not match up the to researchers hypothesis.
At the two year follow-up, there was no difference in pain relief, improved knee function or patient satisfaction. Results also showed that meniscectomy did not provide better functional improvement than the nonoperative group.
But what was the difference between these two groups? One group of patients underwent invasive surgery, had tissue remove, and will likely experience long-term meniscus degeneration.
In fact, most surgical meniscus treatments have, “all have a high long-term failure rate with the recurrence of symptoms including pain, instability, locking, and re-injury. The most serious of the long-term consequences is an acceleration of joint degeneration.”
Studies show no difference between arthroscopic partial meniscectomy and non-surgical treatment
So, even if the knee is stabilized, removing the meniscus causes osteoarthritis. Consider this conclusion from a medical paper published in late 2014:
In this study from China, doctors said that an arthroscopic partial meniscectomy is a good option for a medial meniscal tear in late middle-aged adults. For best success, you need a proper diagnosis and excellent surgical technique. If you follow these two rules all the patients could get good clinical results, HOWEVER, “there are some patients with motion restrictions in the early stage after the operation.” (15)
In research from May 2016, doctors warned that the role of arthroscopic partial meniscectomy in reducing pain and improving function in patients with meniscal tears continues to remain controversial and that studies show no difference between arthroscopic partial meniscectomy and non-surgical treatment. (16)
In July 2017 doctors from medical universities in Finland combined their research to publish these findings on Arthroscopic partial meniscectomy in the Annals of the Rheumatic Diseases.
- Arthroscopic partial meniscectomy is one of the most common orthopaedic operations with the number of procedures steadily increasing in the last three decades.
- Most are performed on middle-aged and older patients with knee symptoms and degenerative knee disease.
- Several recent meta-analyses based on randomised controlled trials have failed to show a treatment-benefit of Arthroscopic partial meniscectomy over conservative treatment or placebo surgery for these patients.
Here is the conclusion of the study, what you will find is all the reasons people tell us they NEED arthroscopic knee surgery, are NOT supported
- The widely held assertion that symptoms such as the sensation of knee catching or locking represents a valid indication for arthroscopic surgery.
- Resection of a torn meniscus has no added benefit over placebo surgery in relieving knee catching or occasional locking. (This was shown by this same research team in an earlier study that we will discuss below).
In conclusion, the results of this study showed Arthroscopic partial meniscectomy provides no significant benefit over placebo surgery in patients with a degenerative meniscal tear and no knee osteoarthritis.
Caution should be exercised in referring patients with knee pain and suspicion of a degenerative meniscal tear to MRI examination or Arthroscopic partial meniscectomy, even after a failed attempt of conservative treatment
Two studies from Finnish researchers:
February 2018, Annals of the rheumatic diseases.(17)
- (Our) results support the evolving consensus that degenerative meniscus tear represents an (early) sign of knee osteoarthritis, rather than a clinical entity on its own, and accordingly, caution should be exercised in referring patients with knee pain and suspicion of a degenerative meniscal tear to MRI examination or Arthroscopic partial meniscectomy, even after a failed attempt of conservative treatment.
As noted above this same team of researchers followed up on a previous study. As part of the Finnish Degenerative Meniscal Lesion Study Group their study in the medical journal Annals of Internal Medicine concluded:
Resection of a torn meniscus (cutting away tissue that cannot be sutured) has no added benefit over sham surgery to relieve knee catching or occasional locking. These findings question whether (these) mechanical symptoms are caused by a degenerative meniscus tear and prompt caution in using patients’ self-report of these symptoms as an indication for Arthroscopic Partial Meniscectomy. (18)
Why was the primary treatment for a meniscus tear a complete meniscectomy?
Why was the primary treatment for a meniscal tear a complete meniscectomy, a surgery that removed the entire meniscus from the knee? Why in the patient base that seemed the most likely to need a meniscus?
A typical patient profile for this procedure was a younger, active, athletic patient who through their lifestyle accelerated knee overuse, and, the older patient who suffered from degenerative osteoarthritis.
The goal of complete meniscectomy was to reduce pain, restore knee function, and prevent the development of osteoarthritis. As surgeons had long believed that the meniscus was a “remnant” tissue and that it was not needed, it could be removed if damaged without a negative effect.
However, as medical research studied the long-term effects of this procedure, it became apparent in the medical community that complete meniscectomy was a primary cause of the sudden onset of knee osteoarthritis. The meniscus was, in fact, an important component of the knee.
The meniscus provides several vital functions including mechanical support, localized pressure distribution, and lubrication to the knee joint. They are made of thick fibrous cartilage that allows it to function as a shock absorber between the upper and the lower leg bones.
Even the American Academy of Orthopedic Surgeons was unable to come up with evidence to support the use of partial meniscectomy.
They looked at a study comparing arthroscopic partial meniscectomy to a conservative exercise program.(19)
- The authors reported no significant treatment benefits of meniscectomy and at the 6 month follow up there was no difference noted between the two groups, “in terms of reduced knee pain, improved knee function and improved quality of life.” Not only was there no benefit, but it is important to note that surgical treatment for meniscal injuries can result in an acceleration of cartilage degeneration and an increased rate of osteoarthritis.
The meniscus can have a 90% tear and it will still figure out how to function
The meniscus has a very difficult time healing its own injuries because of a lack of vascularization to the entire meniscus. That is the blood which carries healing elements do not reach all of the meniscus. Because of this, the meniscus is a composite of different types of cells, superficially, those that can heal, those that can’t.
However, researchers at the University of Pennsylvania examining the meniscus’ complex mesh of fibers that run criss-cross to each other discovered that the two types of meniscus fibers, who jobs are to absorb knee impact, the circumferential fibers and the radial tie fibers have a unique understanding of maintaining knee integrity in the event of meniscus injury.
They write: The meniscus is comprised of circumferentially aligned fibers (basically a mesh) that resist the tensile forces within the meniscus that develop during loading of the knee. Although these circumferential fibers are severed by radial meniscal tears, tibial contact stresses (the impact on the shin bone) do not increase until the tear reaches about 90% of the meniscus width, suggesting that the severed circumferential fibers still bear the load and maintain the mechanical functionality of the meniscus.
Note: The meniscus can have a 90% tear and it will still figure out how to function.
How it does this, is that the radial tie fibers, the perpendicular mesh network of the meniscus is helping to redistribute the knee load back to the severed but still functioning circumferential fibers.
Note: What does all this mean?
The study conclusion spells it out. “This finding supports the notion that radial tie fibers may similarly promote tear tolerance in the knee meniscus, and will direct changes in clinical practice and provide guidance for tissue engineering strategies.”(20)
Is there recovery after an arthroscopic meniscus surgery?
Some of the questions patients want to be answered when they compare non-surgical to surgical treatment of meniscus tears are:
- What is the recovery time after meniscus surgery?
- For many in regenerative medicine, this is a trick question because as the independent research cited in this article makes clear your meniscus will never recover and your knee will be made that much weaker.
- Follow the timeline after surgery
- Most patients can stand and put weight on their knee somewhat immediately with help of a knee brace
- Typically a patient can walk without crutches a few days to 6 weeks after meniscus surgery. Depending on narcotic pain medication doses
- Range of motion restored 1 – 6 weeks depending on surgical procedure
- Return to sports 4 weeks to 6 months
While these numbers sound reasonable they are not for the patients in the long-run. Non-surgical treatments such as comprehensive Prolotherapy typically and for a realistic expectation of treatment success are offered at about 6-week intervals and on average see results at the third treatment – anywhere from 12 – 18 weeks after first treatment.
The difference is: While meniscus surgery can offer short-term goals the knee is in a downward spiral of joint instability to osteoarthritis to degenerative joint disease. In Comprehensive Prolotherapy, the knee joint instability is restored by repairing and regenerating tissue.
Can our treatments regenerate meniscus tissue. If that is your question than we invite you to continue your research at our answer articles:
- Stem cells for meniscus tears,
- Prolotherapy for meniscus tears.
- Platelet Rich Plasma Therapy for meniscus repair
Do you have a question about meniscus surgery or need help?
Get help and Information from our Caring Medical staff
Danielle Steilen-Matias, PA-C | Katherine Worsnick, PA-C | Ross Hauser, MD | David Woznica, MD
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