An orthopedic fixation system for attachment of a rod to a bone portion, the orthopedic fixation system comprising: a plate having an upper surface and a lower surface in opposition to one another, at least one pocket formed through the upper and lower surfaces, the pocket configured to receive an anchor for coupling the plate to the bone portion, a first end and a second end in opposition to one another, a line extending between the first end and the second end defining a longitudinal section of the plate, at least one arm portion extending at an angle from the longitudinal section of the plate, the at least one arm portion having a course formed by an inwardly projecting top shelf providing a channel; and a housing having a base configured for slideable engagement with the course to allow selective positioning of the housing along the arm portion, the housing defining a passageway configured for slideable engagement with a rod to allow selective positioning of the rod and the housing with respect to one another, an attachment ring including a rotational stop at least partially disposed in the course which limits the amount of rotation of the housing relative to the arm portion, and a compression fitting (1145; 1135) configured for engagement with the housing and the rod so as to allow selective fixation of the housing along the arm portion and the rod and the housing with respect to one another wherein the course comprises an opening in the upper surface of the arm portion, the opening having a width, wherein the base has a length and a width, and wherein both the base length and the base width are larger than the opening width. a plate having an upper surface and a lower surface in opposition to one another, at least one pocket formed through the upper and lower surfaces, the pocket configured to receive an anchor for coupling the plate to the bone portion, a first end and a second end in opposition to one another, a line extending between the first end and the second end defining a longitudinal section of the plate, at least one arm portion extending at an angle from the longitudinal section of the plate, the at least one arm portion having a course formed by an inwardly projecting top shelf providing a channel; and a housing having a base configured for slideable engagement with the course to allow selective positioning of the housing along the arm portion, the housing defining a passageway configured for slideable engagement with a rod to allow selective positioning of the rod and the housing with respect to one another, an attachment ring including a rotational stop at least partially disposed in the course which limits the amount of rotation of the housing relative to the arm portion, and a compression fitting (1145; 1135) configured for engagement with the housing and the rod so as to allow selective fixation of the housing along the arm portion and the rod and the housing with respect to one another wherein the course comprises an opening in the upper surface of the arm portion, the opening having a width, wherein the base has a length and a width, and wherein both the base length and the base width are larger than the opening width.