The results of any one medical study can offer good information. But comparing the results of many studies is even more helpful. This is called meta-analysis . In this meta-analysis doctors compared the results of total knee replacements (TKRs) with and without patellar resurfacing. This means the bony kneecap is removed. It's replaced with a metal or plastic-backed implant. The authors asked these questions: Are there fewer cases of reoperation when the patella is resurfaced? How often does knee pain occur after each type of operation? What kind of knee function is possible? Ten studies including 1,223 knees had data that could answer these questions. Researchers used number of reoperations, knee pain, and function to measure results. They found there were fewer reoperations and less knee pain for patients with resurfaced patellae. Knee function seemed to be about the same in both groups.
Other studies show a higher number of reoperations over time for patients with resurfaced patellae. ...
Definition Kneecap dislocation occurs when the triangle-shaped bone covering the knee (patella) moves or slides out of place. The problem usually occurs toward the outside of the leg. Alternative Names Dislocation - kneecap; Patellar dislocation or instability Causes Kneecap (patella) dislocation is often seen in women. It usually occurs after a sudden change in direction when your leg is planted. This puts your kneecap under stress. Dislocation may also occur as a direct result of injury. When the kneecap is dislocated, it can slip sideways and around to the outside of the knee.
One of the first questions I sometimes hear from people who have knee pain is: Doc, do you think it is arthritis? The answer is, invariably, please tell me more about your pain. There are many causes of knee pain and arriving at an accurate diagnosis begins with a full, comprehensive medical history and physical examination. Osteoarthritis is one of the more common causes of knee pain in people over the age of 55. However, there are many other potential causes in this population of people as well. For example, knee pain can be due to:
Ø A meniscus tear
Ø A ligament tear, sprain, or strain
Ø Malalignment of the patella (knee cap) leading to pain beneath the patella
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