A prosthesis (210, 230) for treating disorders of the knee in the patellofemoral compartment of the knee is disclosed. The prosthesis comprises a fixation portion (220, 236) configured to be mounted to the tibia medially or laterally of the tibial tuberosity； a spanning section (218, 234) disposed between the fixation portion and displacement portion, the spanning section configured and dimensioned to extend cranially and laterally or medially from the fixation portion in a direction towards the tibial mid-line； and a displacement portion (216, 232) configured and dimensioned to (i) extend from the spanning section further laterally or medially under patellar tendon and in engagement therewith, and (ii) displace the patellar tendon anteriorly sufficiently to alter the location, angle or magnitude of forces exerted thereby on the patella so as to achieve a therapeutic effect in patellofemoral compartment of the knee.
