Abstract: A physical therapy system including a boot assembly, a track assembly and a communications assembly is disclosed. The boot assembly includes a boot that is worn on the foot of the user with the knee that requires treatment. The boot includes a cushioned sole provided by a sponge within the boot. The sponge being entirely enclosed by a cover. The track assembly includes a track on which the boot is maneuvered on. The boot and the track having a low friction coefficient to allow the boot to easily slid on the track. The user may maneuver the boot in a manner that rehabilitates their knee. Within the boot is the communication assembly which includes a processor and sensors to gather data from the usage of the boot. The collected data is communicated to a mobile device allowing a user to track their therapy sessions and progress.