Fenestrated implant

An implant for sacroiliac joint fixation, the implant comprising:

• an elongate body having a longitudinal axis, a distal end, a proximal end, three or four sides, and a rectilinear cross sectional outer profile transverse to the longitudinal axis, the rectilinear cross sectional outer profile extending from a proximal half of the elongate body into a distal half of the elongate body,
• each of the three or four sides having therein a plurality of fenestrations,
• wherein the elongate body includes an axially-extending central lumen disposed about the longitudinal axis, and wherein the plurality of fenestrations in each of the three or four sides does not extend to the central lumen, and
• wherein the elongate body has a bending strength or a shear strength of at least 0.5 relative to a reference elongate body with identical dimensions and material composition but without any fenestrations.