Acute dislocation of the patella is a common orthopaedic emergency. The dislocated patella commonly reduces spontaneously or is reduced by a physician as an emergency. Rarely. open reduction is needed. https://www.roneverhart.com/Motivo-Tour-Rolling-Upright-Walker-Folding-4-Wheel-Rollator-with-Tray-Cup-Holders-Seat-Storage/