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Modified design features of Attune compared to PFC Sigma. (A) The trochlear groove of Attune is extended more distally than PFC Sigma, resulting in a reduced intercondylar box ratio. (B) Reduced width and thickness of Attune (inner dimension; solid line) compared to PFC Sigma (outer dimension; dotted line). (C) The Attune prosthesis has a medialized dome patellar component for optimizing patellofemoral conformity.
