The LSI Arthroereisis Peg System is an ultra-high molecular weight polyethylene implant for the treatment of hyperpronated foot and stabilization of the subtalar joint provided with a set of instruments used for implant site preparation and delivery. The device is offered in Small, Small Plus, Medium, Medium Plus, Large, and Large Plus implant sizes to allow for appropriate sizing of the peg between the calcaneus anterior and the talus. Accessory tools are included in a tray to determine the correct size of implant including sizers and trial sizers. System instrumentation includes starter awls, an angled awl, drill guides, drill, and trephines.