A patella implant for knee arthroplasty comprising: - a cap including an articulating surface , the cap having a plurality of first connection members ; and - a base configured to be attached to the backside of a patella of a patient, the base including a cap support mounted to the cap , the cap support including a plurality of first connection recesses , wherein each first connection member of the cap is disposed in a corresponding one of the first connection recesses of the cap support to mount the cap to the base , wherein the cap includes a plurality of second connection members and the cap support of the base includes a plurality of second connection recesses , wherein each second connection member of the cap is disposed in a corresponding one of the second connection recesses of the cap support to mount the cap to the base , wherein the second connection members have a different shape than the first connection members and the second connection recesses have a different shape than the first connection recesses , wherein the cap support includes a plurality of interconnecting voids , each interconnecting void extending between and interconnecting two adjacent second connection recesses , and wherein the cap includes a plurality of interconnecting struts , each interconnecting strut extending between and interconnecting two adjacent second connection members , each interconnecting strut disposed in a corresponding one of the interconnecting voids . - a cap including an articulating surface , the cap having a plurality of first connection members ; and - a base configured to be attached to the backside of a patella of a patient, the base including a cap support mounted to the cap , the cap support including a plurality of first connection recesses , wherein each first connection member of the cap is disposed in a corresponding one of the first connection recesses of the cap support to mount the cap to the base , wherein the cap includes a plurality of second connection members and the cap support of the base includes a plurality of second connection recesses , wherein each second connection member of the cap is disposed in a corresponding one of the second connection recesses of the cap support to mount the cap to the base , wherein the second connection members have a different shape than the first connection members and the second connection recesses have a different shape than the first connection recesses , wherein the cap support includes a plurality of interconnecting voids , each interconnecting void extending between and interconnecting two adjacent second connection recesses , and wherein the cap includes a plurality of interconnecting struts , each interconnecting strut extending between and interconnecting two adjacent second connection members , each interconnecting strut disposed in a corresponding one of the interconnecting voids . wherein each second connection member of the cap is disposed in a corresponding one of the second connection recesses of the cap support to mount the cap to the base , wherein the second connection members have a different shape than the first connection members and the second connection recesses have a different shape than the first connection recesses , wherein the cap support includes a plurality of interconnecting voids , each interconnecting void extending between and interconnecting two adjacent second connection recesses , and wherein the cap includes a plurality of interconnecting struts , each interconnecting strut extending between and interconnecting two adjacent second connection members , each interconnecting strut disposed in a corresponding one of the interconnecting voids . <EOS>