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.