B757 FLT CREW HAS R MAIN GEAR MALFUNCTION DURING TAXI FOR TKOF.

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I CAN'T SPECULATE AS TO WHY THE EVENT OCCURRED. THERE WAS PACKED ICE ON THE RAMP AND TXWYS; I HAVE NO IDEA IF THIS CONTRIBUTED TO THE SITUATION. WE WERE ON TXWY S TURNING SOUTHBOUND ONTO TXWY S1. WE WERE CLEARED FOR TAKEOFF. AS I WAS TURNING ONTO TXWY S1 TO ACCESS RWY 27L THERE WAS A RADIO BROADCAST FROM A FELLOW PILOT IN ANOTHER AIRPLANE BEHIND US: 'ACR X HOLD YOUR POSITION. DO NOT ATTEMPT TO TAKE OFF. YOUR RIGHT LANDING GEAR IS CANTERED ABOUT 50 DEGREES FROM ITS NORMAL POSITION.' WE HELD OUR POSITION. SHUT DOWN ENGINES. CALLED MAINT. I USED MY CELL PHONE TO CONTACT MY DISPATCHER. SENT OUT BUSES TO PICK UP OUR PAX AND CREW AND RETURN THEM TO THE TERMINAL. THE RIGHT MAIN LNDG GEAR TRUCK WAS INDEED CANTERED 50 DEGREES TO THE L OF ITS NORMAL POSITION. I DON'T HAVE ANY RECOMMENDATIONS.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED DURING PUSHBACK FROM THE GATE THE MOVEMENT OF THE ACFT BY THE TUG DID NOT FEEL NORMAL BUT ATTRIBUTED THE MOVEMENT TO THE ICE AND SNOW PRESENT ON THE SURFACE. AFTER THE PUSHBACK THE BRAKES WERE SET AND THE RPTR NOTED THAT THE TUG WAS AT THE NINE O'CLOCK POSITION TO THE ACFT VICE FWD OF THE FUSELAGE. THIS WAS PRIOR TO THE TOW BAR BEING DISCONNECTED. RPTR STATED THAT THIS WAS UNUSUAL; BUT ONCE AGAIN ATTRIBUTED IT TO THE ENVIRONMENTAL FACTORS PRESENT AND THE DIFFICULTY WITH THE PUSHBACK. THE TAXI OUT TO THE RWY APPEARED NORMAL. WHEN CLRNC FOR TKOF WAS RECEIVED; THE ACFT HAD TO BE TAXIED SLIGHTLY L OF THE TXWY AND THEN TURNED R TO ARR AT THE RWY. DURING THE SEQUENCE OF EVENTS THE RPTR STATED THAT THE ACFT CAME TO A STOP AND HE WAS UNABLE TO MOVE THE ACFT FURTHER. SIMULTANEOUSLY; A FLT CREW IN ANOTHER ACFT ALERTED THE FLT CREW TO THE R MAIN GEAR BEING OUT OF ALIGNMENT. AT THIS TIME THE ACFT WAS SECURED; THE COMPANY NOTIFIED AND THE PAX DEPLANED. THE RPTR STATED THAT DISCUSSION WITH COMPANY MAINT PERSONNEL AFTER THE INCIDENT INDICATED THAT THE PROB WITH THE MAIN GEAR HAS OCCURRED BEFORE. THIS WAS DURING PERIODS OF ROUGH ICY CONDITIONS ON THE TXWYS. THE RPTR STATED THAT THE COMMENTS REGARDING PREVIOUS INCIDENTS COULD NOT BE CONFIRMED.