Stem cell injections help speed up bone healing. According to a summary study by Professor Doan's research group, in 2010, performed on 22 patients with leg lengthening and stem cell injections, the average bone healing time was 28 days/1 cm lengthened, compared to The average bone healing of conventional leg lengthening without using stem cells is 42 days. This difference is statistically significant. You can see in here https://drdoan.vn/te-bao-goc-trong-keo-dai-chan/