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I have knee pain on outer part of knee. What can it be?

Knee pain on outer part of knee. What can it be? Two months ago, I injured my left knee playing tennis. The most significant symptom is that it hurts on the outside of the knee when I squat or go down a flight of stairs. Also, when I'm going downhill. According to my orthopedist (who saw the MRI but not the radiologist reading), I have a lateral meniscus tear. I got an MRI and the reading says the following. The problem is that my lateral meniscus is intact. The x-rays are also negative. So where is the pain coming from? IMPRESSION: 1. Moderate size joint effusion with small subchondral irregularity of the posterior and superior patella. Correlate clinically. 2. Oblique tear of posterior horn medial meniscus with sprain of the ACL. 3, myxoid degeneration in the posterior horn of the lateral meniscus. The reason I don't go to the ortho again is because he suggested arthroscopic surgery without actually being certain of what I have. Plus, he said I had a tear in the lateral meniscus, but that meniscus is fine. Since my lateral meniscus is fine, what can the problem be? I don't have any symptoms of an injury in the medial meniscus.
Asked On : Sun, 25 Jul 2010
Answers:  1 Views:  380
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Orthopaedic Surgeon 's  Response
Dear Myers,
Sorry for the late reply. I'll say the Orthopaedic and the radiologist might not be able to identify the minute or remote injury on MRI. It might be a lat meniscus tear as your orthopaedician says, but to be certain of the diagnosis he's offered you the gold-standard investigation- the Arthroscopy! Its the only option to peek inside the knee, at the same time it offers to rectify the problem in the same sitting (if its a tear of meniscus or ligament whatever). So go right ahead and do it.
Good luck and do ask your surgeon to make a recording of what he does in your knee.
Answered: Sat, 21 May 2011
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