The EE had to walk sideways through a 23 inch walkway to go to the maintenance shop. The employee was side-stepping to the right. As the EE was free to sqare up his body, the next step is where the EE heard and felt the pop in his right foot. The EE fractured his right 5th metatarsal. A splint and restricted work was the outcome, thus resulting in the MSHA reportable.