- Biomechanical consequences of replacement of the anterior cruciate ligament with a patellar ligament allograft. Part II: forces in the graft compared with forces in the intact ligament. Markolf, K.L., Burchfield, D.M., Shapiro, M.M., Cha, C.W., Finerman, G.A., Slauterbeck, J.L. The Journal of bone and joint surgery. American volume. (1996)