Abstract: Joint sensor devices, bracing members, and methods of use are provided. A joint sensor device includes a bracing member contoured to fit over a joint on a limb of a human subject, such that the bracing member allows the limb to pivot; at least a first sensor operably connected to the bracing member, such that the first sensor is configured to detect an angle of the joint; at least a second sensor operably connected to the bracing member, such that the second sensor is configured to detect a vibration caused by joint movement; and a data communication device operably connected to the sensors, wherein the data communication device communicates signals from the sensors to an external device. The devices can also include temperature sensors. Bracing members and methods of monitoring joint health of subjects are also disclosed.