FROM OUR EXPERTS
A good fit between bone and implant is needed to maintain knee range of motion after total knee replacement (TKR). The shape of the bone and thickness of the edges called flanges of the implant are factors affecting motion, too. Pain and problems after a TKR can be caused by poor alignment of the implant to bone. The wrong size femoral component can change the way the knee works and moves. Any mismatch between the bone and implant can alter the joint biomechanics. In this study researchers used cadavers models to create a situation called overstuffing . Then they looked to see if overstuffing would decrease knee flexion. Overstuffing occurs when the shape and size of the femoral component of the implant is too large or the wrong shape (often too "boxy" or square). They found that a small difference where the size of the femoral component (front to back) was only four millimeters larger than the real knee caused a four degree loss of passive knee flexion. This difference may not affect t...
Imagine that after years of painful knee symptoms, you have a total knee replacement (TKR). Ahhh, relief at last! But within a couple of months, the knee starts making a loud "clunk" every time you straighten it from a fully bent position. The problem could be the patellar clunk syndrome. This syndrome occurs when a fibrous nodule develops on the back of the kneecap (patella). When the knee bends, this fibrous bump gets trapped within a notch in the surface of the thighbone (femur). (The bottom of the femur meets the top of the tibia in the lower leg to form the knee joint.) As the knee straightens, the bump moves out of the notch. Knee pain and a "crunching" sound occur as the patella moves against the femur. At the same time, a "clunk" is usually heard. Doctors think that two factors cause the patellar clunk syndrome: the design of the joint implant (on the femoral side) and the patient's knee-flexion angle. Generally, only patients with more than average knee flexion get this proble...
About two months ago, I injured myself during kickboxing. I think I was doing a squat and turned my knee inward.
My knee hurt afterward, but I figured that maybe once I had my next dose of Humira, it would feel better. This was kind of nonsensical because while I’ve had knee pain with my arthritis, it hasn’t been one of the more significant areas of my body impacted by my arthritis.
So I let it go. My Humira dose came and went, and my knee still hurt.
I wasn’t really paying that much attention to the knee pain, but the kicker (no pun intended) was when, in another episode of kickboxing, I did a side plank (if you don’t know what that is, see: http://www.mayoclinic.com/health/core-strength/SM00047&slide=12 ), putting all of my weight on my knee, and it completely collapsed.
After a week of the pain getting worse, I went to the doctor, and was told that I had misaligned my kneecap. I was sent to p...
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