A knee pain diagnosis chart is available on FamilyDoctor.org, as of 2015. The chart is a flow chart that asks questions and then provides alternatives to the questions, which must be selected to discover the root cause of knee pain.
For example, visitors to FamilyDoctor.org go to the "Begin Here" section of the chart to answer to answer the first question, which is whether the knee pain began after an injury or fall. If the answer is "yes," then the chart asks whether or not the knee is deformed. If the answer is "yes," then the chart indicates that the knee may be fractured or ligaments may be torn. The chart then indicates that it is a medical emergency and instructs the visitor to seek help right away.