University of Hertfordshire

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Original languageEnglish
JournalInternational Journal of Applied Mechanics
Publication statusAccepted/In press - 7 Jan 2020


Core Bone Plug Fixation (CBPF) technique is an implant-less methodology for ACL reconstruction. This study investigates the bone density effect on the CBPF stability, to identify the patients that are likely to benefit from this technique. Sawbones blocks with 160 (Group 1), 240 (Group 2) and 320 (Group 3) kg/m3 densities were used to simulate human bone with diverse qualities. A tunnel was made in each test sample using a special drill bit which enabled removing the core intact. Bovine tendon grafts were harvested and passed through the tunnel, so the core was pushed into, to press fit it. The fixation stability was tested by applying a cyclic load following by a pullout load until the failure occurred. The Group 2 stiffness and yield strength were significantly larger than Group 1. The graft slippage of Group 1 was significantly less than Group 3. The ultimate strengths were 310 and 363 N, in Groups 2 and 3, significantly larger than that of Group 1. So the stability of CBPF was greatly affected by the bone density and comparable with the absorbable interference screws. With further improvements, the CBFS might be an alternative ACL reconstruction technique for patients with good bone quality.

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