Orthopedic fixation devices, assemblies, and methods for securing a spinal rod. The orthopedic fixation device may include a tulip head, a bone fastener, a rotatable saddle, and a threaded locking cap. The saddle may be insertable into the tulip head in an unlocked position with a rod seat offset relative to a rod slot of the tulip head. The saddle may be rotated into a locked position with the rod seat aligned with the rod slot such that a rod is positionable through the rod slot and into the rod seat. The threaded locking cap may secure the rod and bone fastener.