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This paper reports the results of an experimental and finite element analysis of tibial screw fixation in hamstring ACL reconstruction. The mechanical properties of the bone and tendon graft are obtained from experiments using porcine/calf bones and tendon. The results of the numerical study are compared with those from mechanical testing. Analysis shows that the model may be used to establish the optimum placement of the tunnel in anterior cruciate ligament reconstruction by predicting mechanical parameters such as stress, strain and displacement at regions in the tunnel wall. [ABSTRACT FROM AUTHOR]

Chapter 27 of the book "Peterson's Principles of Oral and Maxillofacial Surgery" is presented. It offers an overview of the development of pediatric craniomaxillofacial fracture management. It discusses the patterns of pediatric facial fracture injury and their management. The standard materials for craniomaxillofacial fixation are titanium alloy plates and screws.

Chapter 20 of the book "Peterson's Principles of Oral and Maxillofacial Surgery" is presented. It defines rigid internal fixation as a form of bone fixation to avoid interfragmentary motion across the fracture. It explains the types of nonrigid fixation that allow the use of skeleton during the healing phase. It presents details of the lag screw fixation technique.