Biomechanical consequences of replacement of the anterior cruciate ligament with the 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. (J Bone Joint Surg [Am], 1996)