A versatile orthopedic device is arranged to convert between ligament and osteoarthritis treatment, and to accommodate a variety of leg anatomies. The shell may include an inlet port. The host includes a data store for storing identification codes of nodes. 0 \u03bcm, and more preferably about 0. The patch management system can ensure that there are no conflicts between the installed patches. The mode may allow the interface device and any other devices, networks, or transmission lines attached to the interface device to be more thoroughly exercised than previously able.