- Effect of low intensity pulsed ultrasound on healing of an ulna defect filled with a bone graft substitute. Walsh, W.R., Langdown, A.J., Auld, J.W., Stephens, P., Yu, Y., Vizesi, F., Bruce, W.J., Pounder, N. J. Biomed. Mater. Res. Part B Appl. Biomater. (2008)