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This study used the ovine stifle joint model to investigate the effect of patellar tendon lengthening on the 3D passive kinematics of the patellofemoral and tibiofemoral joints. Eight patellar tendons were lengthened in 2\u2009mm increments up to a maximum of 12\u2009mm (20%) using a device placed in series with the transected patellar tendon. Three\u2010dimensional kinematics were measured in the intact joint and at each increment of patellar tendon length (<jats:italic>L<\/jats:italic><jats:sub>T<\/jats:sub>) during passively induced tibiofemoral flexion. Patellar flexion angle was linearly correlated with tibial flexion angle in the intact joint, and this correlation persisted after tendon lengthening (<jats:italic>R<\/jats:italic>\u2009=\u20090.897\u20130.965, <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.01). Patellofemoral kinematics expressed as a function of tibial flexion angle were significantly altered by <jats:italic>L<\/jats:italic><jats:sub>T<\/jats:sub> increases &gt;9%. In contrast, when patellofemoral kinematics were expressed as a function of patellar flexion angle they were not significantly altered by increases in <jats:italic>L<\/jats:italic><jats:sub>T<\/jats:sub>. Tibiofemoral kinematics were not affected by the <jats:italic>L<\/jats:italic><jats:sub>T<\/jats:sub> increases. These results demonstrate that for a given tibial flexion angle, patellar tendon lengthening alters the patellar flexion angle. However, for a given patellar flexion angle, the orientation of the patella in the remaining five degrees of freedom is unchanged, implying a repeatable path of patellar motion. \u00a9 2012 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. 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