An adapter assembly for operably connecting an end effector to a powered surgical instrument is provided. The adapter assembly includes a drive coupling assembly, a first drive assembly, a second drive assembly, and an actuation assembly. The first drive assembly is operably connected to the drive coupling assembly and includes a first push/pull cable. The second drive assembly is operably connected to the drive coupling assembly and includes second and third push/pull cables. The actuation assembly includes a first pusher member. Retraction of the second and third push/pull cables effects advancement of the first pusher member.Also provided is a surgical assembly for connection to and operation by a handheld electromechanical instrument. The surgical assembly includes a trocar assembly and an adapter assembly. The trocar assembly includes a locking member, and a trocar member releasably secured to the locking member. The adapter assembly is configured to be releasably secured to a handheld electromechanical instrument and includes a first drive cable. The locking member of the trocar assembly is secured to the first drive cable and is movable between a first position where the trocar member is releasable from the locking member and a second position were the trocar member is secured to the locking member.
