When you have a knee replacement, you expect certain foreseeable side effects, including discomfort, pain, and difficulty walking. However, some individuals who received the Zimmer NexGen CR-Flex knee replacement system encountered serious side effects that were not made obvious before surgery. Some patients who received the Zimmer NexGen CR-Flex knee replacement system were given a defective unit, which had an unacceptably high failure rate. The side effects from this defective unit included serious pain, difficulty walking, and more, which resulted in the need for an additional replacement surgery. If you had a Zimmer NexGen knee replacement surgery and are suffering from side effects, contact a Zimmer NexGen CR-Flex knee replacement lawyer today to find out your legal rights and options.