Rapid prototyping (RP), especially useful in surgical specialities involving critical three-dimensional relationships, has recently become cheaper to access both in terms of file processing and commercially available printing resources. One potential problem has been the accuracy of models generated. We performed computed tomography on a cadaveric human patella followed by data conversion using open source software through to selective-laser-sintering of a polyamide model, to allow comparative morphometric measurements (bone No significant differences in the dimensional measurements could be demonstrated. These data provide us with optimism as to the accuracy of the technology, and the feasibility of using RP cheaply to generate appropriate models for operative rehearsal of intricate orthopaedic procedures.
This biomechanics investigation evaluated commercially available studded and bladed football boots to determine whether boot type influences potential non-contact ACL injury when football players sidestep cut. Fifteen professional outfield male football players, without history of lower limb injury, with at least two consecutive injury-free seasons participated. Each undertook three trials of a straight line run and sidestep cuts at 30° and 60° with approach velocity 5.5ms-1 - 6.0ms-1 on a FIFA (Fédération Internationale de Football Association) approved artificial football surface. Four pairs of standardised football boots (two bladed and two studded) were investigated. Using 3D inverse dynamics analyses based on an eight camera gait analysis system (120Hz) synchronised with a force platform (960Hz), peak absolute knee internal tibial rotational moments (Mz), valgus moments (My) and anterior joint forces (Fx) were determined throughout the stance phase. Values were compared with cadaveric critical limits for ACL injury. A univariate repeated measures ANOVA quantified differences between the variables as a function of cutting angle and boot type.Introduction
Methods
