  Patients undergoing physical rehabilitation therapy must perform series of
exercises regularly over a long period of time to improve, or at least not to
worsen, their condition. Rehabilitation can easily become boring because of the
tedious repetition of simple exercises, which can also cause mild pain and
discomfort. As a consequence, patients often fail to follow their
rehabilitation schedule with the required regularity, thus endangering their
recovery. In the last decade, video games have become largely popular and the
availability of advanced input controllers has made them a viable approach to
make physical rehabilitation more entertaining while increasing patients
motivation. In this paper, we present a framework integrating serious games for
the lower-limb rehabilitation of children suffering from Juvenile Idiopathic
Arthritis (JIA). The framework comprises games that implement parts of the
therapeutic protocol followed by the young patients and provides modules to
tune, control, record, and analyze the therapeutic sessions. We present the
result of a preliminary validation we performed with patients at the clinic
under therapists supervision. The feedback we received has been overall very
positive both from patients, who enjoyed performing their usual therapy using
video games, and therapists, who liked how the games could keep the children
engaged and motivated while performing the usual therapeutic routine.
