Figure 2.

Nitinol dome memory alloy connector used to treat navicular nonunion. (a) Puncture the position with a 5ml syringe needle under the fluoroscopy of the c-arm. (b,c) Cut through skin and muscle tissue (purple) to expose the scaphoid nonunion. (d) Determine the appropriate implantation position at the proximal and distal ends of the bone. (e) Remove fibrous scar tissue and hardened calluses through electric drilling. (f) Repair the cancellous bone graft with attachment cortex. (g,h) Select a suitable NiTi alloy and insert it, then spray warm (35–40 °C) salt water to gradually tighten the extended arm until it almost reaches its original shape. (Reproduced with permission [118]. Copyright 2019, Springer Nature).