MRI Examination Of
A Knee -- Possible Diagnosis

Jean Ross, as of May 28, 2003, had surgery for a complete knee replacement. If you have any interest in the details of that action, current as of May 28th, CLICK HERE.
Lets say that you have sore or aching knees, and you eventually get an examination done by the MRI machine. You then get a copy of the diagnostic report. This report is intended for a specialist doctor who understands all the words on it, but you start reading it and find that you don't understand any of the words. The MRI machine is fully described HERE. For information about hip joint repair or replacement, click HERE.
This web section has many pages. Look at the Table Of Contents for more.
Summary
The report refers to a tear of the meniscus, but those references must be evaluated in reference to the following. It is probably better understood if you call this meniscus "cartilage" and consider it very similar to the "gristle" you find in tough meat. Most likely in an older person there was not a sudden "tear" of this cartilage, but a gradual wearing and weakening. There are a couple surgical possibilities described here. There is also a non-surgical, non-drug treatment that undoubtedly cannot be the final answer, but can be a first response.
If you are considering getting an MRI? Check this article out:
Physical therapist Diann Inch knew she had injured her hip climbing a ladder, but an MRI scan didn't find anything wrong.
As it turns out, it was the scan that was wrong. (Source)
Left Knee
The report on the left knee includes this comment: There is no definite evidence of meniscal tear identified. The patella appears to be unremarkable and shows normal relationship with the distal femur. (source) At first glance this comment seems to conflict with other details about the left knee -- something the doctor's explanation certainly should clear up.
The left knee official summary is as follows:
- 1. moderate degenerative joint disease with joint space narrowing and thinning of the articular cartilage, more on the lateral compartment, with margin osteophyte formation.
- 2. There is mild joint effusion. No Baker's cyst.
3. Degenerative maceration and tear involving the lateral meniscus.
4. Grade II signal change seen in the posterior horn of the medial meniscus (source)
Right Knee
The major finding seems to be: There is linear tear seen in the posterior horn of the lateral meniscus and macerated appearance involving the mid zone and anterior horn of the lateral meniscus. (source)
- 1. Moderate degenerative joint disease involving the lateral compartment of the right knee joint with joint space narrowing, marginal osteophyte formation and thinning of the articular cartilage. There is no adjacent lateral femoral condyle and the lateral tibial plateau.
- 2. There is degenerative tear seen in the posterior horn of the lateral meniscus and macerated appearance involving the mid zone and anterior horn of the lateral meniscus.
- 3. Mild joint effusion No Baker's cyst.
- 4. Remainder of the exam of the right knee otherwise appears unremarkable. Clinical correlation and follow-up recommended. (source)
You want to have your own informed opinion on what the
diagnosis means. So, you come to this page and find that many of the words
on YOUR MRI diagnosis are the same ones as shown here. No patient should
enter the meeting with the knee specialist without having read pages like the
ones on this web.
The term "tear" of a meniscus is probably one of the most severe diagnoses for knee injury and pain. There is material about this BELOW, and also on THIS PAGE. Also there is a simple and brief explanation on THIS page.
The treatment for torn meniscus is to reduce the swelling, rest and ultimately, if necessary, surgery through use of an arthroscope device:
Initial treatment for a torn meniscus usually is directed towards reducing the pain and swelling in the knee. Your physician may recommend crutches for resting the knee for several days and suggest ice to reduce the pain and swelling. If the knee is locked and cannot be straightened out, surgery may be recommended as soon as reasonably possible to remove the torn portion that is caught in the knee joint. Once a meniscus is torn, it will most likely not heal on its own.
If
the symptoms continue, surgery will be required to either remove the torn
portion of the meniscus or to repair the tear. Most meniscus surgery today is
done using the arthroscope. Small incisions are made in the knee to allow the
insertion of a small TV camera into the joint. Through another small incision,
special instruments are used to remove
the torn portion of meniscus while the arthroscope is used to see what is
happening. In some cases, the meniscus tear can be
repaired. The arthroscope is used to view the torn
meniscus. Sutures are then placed into the torn meniscus until the tear is
repaired. Repair of the meniscus is not possible in all cases. Young people
with relatively recent meniscal tears are the most likely candidates for
repair. Degenerative type tears in older people are not usually repairable.
(source)
When the damage to the meniscus is related to a state of degeneration, repair is usually not thought to be feasible. Replacement was considered experimental in Denmark in 1998, but seems to be accepted by at least one surgeon currently.
In the case of older, degenerated (weakened and worn) menisci that typically split apart or break down under routine, day-to-day or minimal stress conditions, the meniscus itself has not been healthy for some time. A degenerative meniscal defect will almost never bleed, and in fact may often occur gradually, without the patient even being aware of it! When such gradual, degenerative meniscal cleavage or fissuring develops and is discovered by MRI scanning or arthroscopy, while it is still commonly said that the patient "tore" their meniscus, this is actually a mischaracterization. To most people, "tearing" something implies a sudden structural failure in response to a specific, applied force. While the terms "torn" and "tear" are convenient for surgeons to use because they are familiar to patients, it is misleading to use them in relation to a degenerated meniscus that is simply worn, frayed, fissured, fragmented or just plain broken down. When a patient hears a surgeon say "You have torn your meniscus", they naturally infer that their meniscus was healthy and functioning properly before it "tore", and that like freshly torn ligaments, their "torn" meniscus can simply be repaired back together again or "fixed", neither of which is the case with degenerated menisci. Within the confines of currently available medical technology, degenerative meniscal defects are almost never amenable to repair. Degenerate menisci break down either spontaneously or under minimal stress because their intrinsic strength and toughness have already been compromised by way of the aging process and/or joint surface erosion caused by arthritis. Attempts at surgical repair are, therefore, pointless and usually doomed to failure. There is little to be gained by trying to stitch mushy, permanently weakened and improperly functioning meniscal tissue back together again. For lack of a better available treatment, surgical removal of the painful, defective meniscal tissue is usually the most appropriate course of action. (source)
. . . .
Aside from good surgical technique, the key to obtaining a high success rate with meniscal repair is often as simple as using selective judgment when making the decision to repair versus remove. All possible effort should be taken to repair otherwise healthy menisci that have excellent healing potential, whereas effort should not be wasted on thoroughly degenerated menisci that have no realistic chance of healing well and/or functioning normally. The decision whether or not to attempt repair in a "borderline" case (i.e., adequate healing is unlikely but not impossible) can involve some input from the patient, as well as consideration of the patient's specific circumstances. The younger the patient, the more consideration should be given toward meniscal repair, as loss of meniscal function sets in motion an accelerated aging process within the joint that leads to at least some degree of future osteoarthritis in the affected region of the knee. In an older individual (over 35 or 40) who is not overweight and who has no leg malalignment ("bowleg" or "knock-knee" deformity) a "borderline" meniscal tear with a sub-par chance for healing after meniscal repair is often best treated by primary meniscectomy.
Karl Note: Complete removal of the meniscus is an extreme procedure Do not miss THIS page to read about various forms of partial removal of a damaged meniscus. This linked page disagrees with the minimal harm done by removal as indicated just below.
"complete meniscectomy is a one-way ticket to arthritis!" (source)
If complete removal is indicated, then "knee replacement" is the next, serious, procedure to be understood. On the "knee replacement page" are many links to separate pages with very detailed images of the text material -- don't miss those!
This is because the patient's knee has probably already been subjected to the majority of stresses that it will see during the course of its lifespan, and it has no specific risk factors (other than the meniscus injury) for premature osteoarthritis. This makes the loss of meniscal cushioning less objectionable. One must also consider the greater risk of surgical complications associated with meniscal repair procedures (vs. simpler and quicker removal procedures) and the extra surgical risks that the patient would be subjected to if a second procedure were to be required because the repair of a "borderline" tear ultimately failed. Even under ideal circumstances, a surgically "repaired" meniscus is not guaranteed to heal!
HERE is a list of the types of things looked for in an MRI of the knee, with the possible findings. This list shows not only the type of things looked for, but the range of possible reports. It is a good list to review to understand the MRI report as a whole.
Non-surgical and non-drug approaches to this diagnosis are slim, but include
As a nutritional consultant to the enlightened dental profession. In periodontal disease and surgery the soft connective tissue (meniscus) is exposed and involved. The natural healing protocols are: (see source for remainder)
and,
Joint swelling scores improved in 47.2% in patients using cetyl myristoleate alone and 77.2% in patients using cetyl myristoleate plus Glucosamine. Patients experiencing worsening or no reaction totaled 1.0% both of the cetyl myristoleate groups, compared with improvement of 21.1% in placebo group. (more at source)
There is a medical treatment, short of surgery, called Viscosupplementation with information here. This is a procedure where an artificial fluid is injected into the knee area -- a fluid similar to the normal human fluid in the knee. This is temporary, only, but can be useful particularly when a person is not a candidate for knee surgery.
One of the common symptoms of knee pain is also a terrible feeling of tiredness. That symptom may be caused by a problem of subnormal body temperature. This is more widespread than thought and causes many other health problems. Click HERE to read more about that.

Here are linked pages:
Magnetic Resonance Imaging of the Knee
Patient's Guide To Meniscus Injuries
Complete Removal Of Damaged Meniscus
Non-Surgical Treatment Of Meniscus DamageVitamin And Other Non-Drug and Non-Surgical Approaches
Joint Effusion -- Part Of A Knee Diagnosis
Imaging Features of Pigmented Villonodular Synovitis with Emphasis on Sonographic Findings
Arthroscopic Pictures of Normal and Torn Meniscus Cartilage
Here is a copy of an actual MRI report.
Imaging Services
501 Soulb Mena
Burbank CA
DEPARTMENT OF IMAGING SERVICES
DATE OF PROCEDURZ:24-Jan-2003
EXAM#:35B-012403
REQUESTING PHYSICIAN: BENOWITZ, IRVIN S
Patient: 67 Year Old Female
DIAGNOSIS. SEVERE BILATERAL KNEE PAIN
INDICATIONS: SEVERE KNEE PAIN
MRI TECHNIQUE. Using a GE 1.5 Tesla magnet, the following pulse sequences were
obtained: Axial fat suppressed FSE T2, sagittal PSE proton density/T2 and
caronal Ti/fat suppressed proton density sequences.
MRI LEFT KNEE:
The knee appears to be in normal alignment. There is mild joint effusion seen in the suprapatellar bursa.
There is no Baker's cyst.
The visualized distal quadriceps tendon, patellae tendon, ACL and PCL are well delineated and appear to be intact.
There is moderate degenerative joint disease with marginal osteophyte and joint space narrowing and articular cartilage thinning noted, seen more at the lateral compartment.
At
the lateral compartment there is degenerative maceration of the mid zone and
anterior horn of the lateral meniscus. There is truncation appearance of the
posterior horn of the lateral meniscus, finding consistent with degenerative
tear.
At the medial compartment there is Grade II signal change seen in the posterior horn of the medial meniscus.
There is no definite evidence of meniscal tear identified. The patella appears to be unremarkable and shows normal relationship with the distal femur.
On the coronal view projection the lateral and medial collateral ligaments appear to be intact.
The visualized bone marrow around the left knee appears to be unremarkable.
There are small subchondral bone marrow changes seen at the inferior aspect of the tibial eminence most likely representing degenerative changes.
MRI: The Right Knee:
The knee is in normal alignment. There is mild joint effusion, mainly seen at the suprapatellar bursa.
There is no Baker's cyst.
The visualized distal quadriceps tendon, patellar tendon, ACL and PCL are well delineated and appear to be intact.
The medial meniscus appears to be unremarkable.
There is linear tear seen in the posterior horn of the lateral meniscus and macerated appearance involving the mid zone and anterior horn of the lateral meniscus.
There is joint space narrowing seen at the lateral compartment with marginal osteophyte formation. This finding is consistent with moderate degenerative joint disease.
There is subchondral mild bone marrow edema seen at the lateral femoral condyle and lateral tibial plateau.
The lateral and medial collateral ligaments appear to be intact. The patella shows normal relationship to the distal femur.
IMPRESSION: LEFT KNEE: :
1. Moderate degenerative joint disease with joint space narrowing and thinning of the articular cartilage, more on the lateral compartment, with margin osteophyte formation.
2. There is mild joint effusion. No Baker's cyst.
3. Degenerative maceration and tear involving the lateral meniscus.
4. Grade II signal change seen in the posterior horn of the medial meniscus
IMPRESSION: RIGHT KNEE:
1. Moderate degenerative joint disease involving the lateral compartment of the right knee joint with joint space narrowing, marginal osteophyte formation and thinning of the articular cartilage. There is no adjacent lateral femoral condyle and the lateral tibial plateau.
2. There is degenerative tear seen in the posterior horn of the lateral meniscus and macerated appearance involving the mid zone and anterior horn of the lateral meniscus.
3 . Mild joint effusion No Baker's cyst.
4. Remainder of the exam of the right knee otherwise appears unremarkable. Clinical correlation and follow-up recommended.
Thank you for referring this patient to us.
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Background & Symptoms
Can I play sports again?
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More detailed information on treatment of a torn meniscus Some of the following information and graphics were
supplied courtesy of The Journal of Bone and Joint Surgery and Sulzer Medica.
The Collagen
Meniscus Implant (CMI): Clinical Studies
CMI images courtesy of Sulzer Medica. |
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