Written and edited by Aruna Seneviratne, M.D
The meniscus is a C shaped piece of cartilage that resides between the two bones of the knee joint - the
femur and the tibia. There are two menisci in each knee - one on the in-board side of the knee (medial
meniscus), and one on the outboard side of the knee (lateral meniscus). They serve an important role in the
function of the knee providing shock absorption, distribution of pressure, joint lubrication amongst other
functions such as a secondary stabilizer of the knee.
Meniscus tears cause pain in the knee. Frequently there is swelling and clicking or a sensation of catching.
Squatting and kneeling become painful and difficult.
Participation in sports can be difficult. The pain can be quite severe at times.
Biology: Why does it occur?
Menisci can tear due to twisting or pivoting of the knee during sports activities, or other mechanisms.
Sometimes the injury mechanism is so subtle that patients may not remember an event that caused their knee
to hurt. The blood supply to the meniscus comes from the periphery of the meniscus where it is attached to
the knee capsule, and penetrates the meniscus traversing centrally. As we age, the blood supply recedes and
that has implications on how meniscus tears are treated.
Common Diagnostic Techniques:
History: Diagnosing the problem begins with a detailed history that your surgeon will obtain from you.
Physical Exam: A thorough physical examination is conducted by your surgeon.
X-Rays: Plain radiographs (X-Rays) are the most important diagnostic study that is performed initially. For
the knee your surgeon will obtain specialized views. Usually these are weight bearing x-rays - i.e.: you
will be standing for the x-rays.
MRI: Your surgeon may obtain additional studies such as an MRI to look more closely at the meniscus and
other soft tissues.
Treatment depends on a variety of factors including patient age, activity level, tear size, and location of
tear. Older patients are usually treated non-operatively with physical therapy. If the tear is greater than
2cm in size the prognosis for becoming symptom free from non-surgical care is poor. If the tear is in an
area of good blood supply, the tear may heal without surgery. Dr. Seneviratne will carefully evaluate each
patient and recommend the optimum course of treatment factoring in all that is relevant to that patient. The
goal is to treat patients with the least invasive manner.
The most common surgical treatment of meniscus tears is arthroscopic partial meniscectomy where a tiny
camera is introduced into the knee via a tiny incision (keyhole surgery), and using arthroscopic instruments
via a second keyhole, the torn piece of the meniscus is removed. The surgery takes about 20 minutes to
complete and is performed under general anesthesia. This operation is one of the most common orthopedic
operations performed in the United States.
Since the meniscus plays an important functional role in the knee, all attempts are made to preserve the
meniscus and repair the tear if it is amenable to repair. Patient selection is important to ensure
outstanding outcomes. Tears located in the vascular zone in younger patients are usually repaired. Dr.
Seneviratne performs all three described techniques of repair - all inside arthroscopic repair, outside-in
repair, and inside-out repair. Dr. Seneviratne has published
techniques on meniscus repair.
Dr. Seneviratne will evaluate each patient individually and recommend a customized plan of surgical care.
Patients are allowed full weight bearing and are discharged from the surgical facility the same day. A cane
maybe needed for a few days. Crutches are rarely needed. Most patients do not require narcotic pain
medicines and can manage the pain with Tylenol or a NSAID such as Advil or Aleve. The knee will
progressively start to feel better over the next few days to weeks. Dr. Seneviratne will see the patient
back in the office for suture removal and to start physical therapy at about 7-10 days after the operation.
Patients will need PT for about 6-8weeks. Running is possible in 6 weeks.
What are the risks of knee arthroscopic meniscus surgery?
Infection, bleeding, damage to nerves and blood vessels, blood clots that form in your legs (DVT), blood
clots that can break off and travel to your lungs causing a pulmonary embolus (PE). Knee stiffness is an
additional risks. These risks are quite uncommon - less than 1% possibility. Possibility of requiring
additional surgery does exist if the meniscus re-tears or if you have persistent pain for a variety of
How long is the recovery period?
Full recovery can be expected in about 3 months depending on the patient. Meniscus repairs take longer to
Can I return to my pre-injury level of play?