Bob of Sauquoit, NY, designed this leg bone cane that he sells on eBay. They're made of polycarbonate and available in a variety of lengths. "Leg Bone Cane/Walking Stick" (Thanks, Michael-Anne Rauback!)
David Pescovitz is Boing Boing's co-editor/managing partner. He's also a research director at Institute for the Future. On Instagram, he's @pesco.