Bone lengthening is a medical procedure used to increase the length of bones, often performed on individuals with limb length discrepancies or certain medical conditions. The process typically involves a surgical technique called distraction osteogenesis, where a bone is cut and gradually pulled apart using a device called an external fixator. This allows new bone tissue to form in the gap over time. The procedure can take several months, as the bone is slowly lengthened by a few millimeters each day. Patients may require physical therapy to regain strength and mobility after the lengthening process. Overall, bone lengthening can improve function and appearance for those in need.