Tunnelwidening in failed anterior cruciate ligament reconstruction (ACLR) can result in the staged revision procedures with a need for bone transplantation prior to revision reconstruction. Limited knowledge exist regarding to quality of different transplantation methods. The present study used CT-scanning to evaluate tunnel bone density after allogenic bone chips and bone cylinder transplantation. We hypothesized that bone chips transplantation resulted in higher bone density than bone cylinder transplantation due to possible voids between individual cylinders in the tunnels. The records of 24 patients operated for 1st stage revision ACLR from April 2003 to march 2010 were included in the study. twelve patients had their tunnels transplanted with bone chips and twelve patients with bone cylinders from allogenic femoral heads. Bone chips were created by fine bone milling and cylinders were extracted by 7–8 mm core drilling. Bone density 3–4 months after transplantation were evaluated by CT scanning reconstruction slides with 5 mm intervals throughout the tunnel length using histomorphometry.Introduction
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