Data will be collected at 12, 26, and 52 weeks from both participants and their treating surgeons. Participants will receive a survey in the mail, and then be contacted over the phone to attain their answers. On each occasion they will be asked whether they have had any further procedures on their leg, and if so at which hospital and by whom. At three months they will also be asked about their average use of the device, whether they are seeing their surgeon in private rooms or a hospital clinic and of their insurance status. That is, are they being treated under medicare, private health insurance, workers compensation, or third party insurance. They will be asked if they have managed to return to work, and to complete the Lower Extremity Functional Score as well as the Short Form-36 (a general health survey). The phone questionnaire is expected to take 15-30 minutes each time.