I can't find anything about control cables being compromise on any dc9/md80 type in an engine failure scenario.
a delta md88 blew an engine in pensacola and parts came through the fuselage and killed two seated in the rear most seats.
the rudder is hydraulically powered, but has full manual reversion through an aerodynamic tab.
the elevator is manual by way of aerodynamic tab...it has a hydraulic ram for nose down in an unusual scenario called a deep stall.
the ailerons are manual though tabs.
the spoilers are hydraulic.
failure of the complete and total hydraulic system leaves this plane completely controllable in all 3 axis of control.
the 737 does not have manual reversion on the rudder...many other planes don't either!