Disclosed is a passive gravity assist flexion and/or extension device, principally for regaining knee joint range of motion flexibility having such arrangement to provide appropriate content vertically stable elevated under knee support of the posterior intersection, concerning the femur and tibia of an impaired knee joint and/or concerning the subtalar joint (ankle) whereby promoting gravity assist passive flexion and/or extension towards gradual content knee joint muscle stretching. The disclosed device arrangement, being comprised of a padded solitary horizontal support bar, capable of desired lateral rotational movement, while firmly affixed mid-span atop a vertical linear traveling wholly enclosed height adjustable threaded rod. Whereby adjustable rod thread engagement means, establishes and maintains desired horizontal support bar height position. Furthermore, the disclosed device utilizes a center base foundation arrangement providing a resolute perpendicular stable knee support means.
