Purpose
This study's main objective is to assess the feasibility of processing the MRI information with identified ACL-footprints into 2D-images similar to a conventional anteroposterior and lateral X-Ray image of the knee. The secondary aim is to conduct specific measurements to assess the reliability and reproducibility. This study is a proof of concept of this technique.
Methods
Five anonymised MRIs of a right knee were analysed. A orthopaedic knee surgeon performed the footprints identification. An ad-hoc software allowed a volumetric 3D image projection on a 2D anteroposterior and lateral view. The previously defined anatomical femoral and tibial footprints were precisely identified on these views. Several parameters were measured (e.g. coronal and sagittal ratio of tibial footprint, sagittal ratio of femoral footprint, femoral intercondylar notch roof angle, proximal tibial slope and others). The intraclass correlation coefficient (ICCs), including 95% confidence intervals (CIs), has been calculated to assess intraobserver reproducibility and interobserver reliability.
Results
Five MRI scans of a right knee have been assessed (three females, two males, mean age of 30.8 years old). Five 2D-"CLASS" have been created. The measured parameters showed a "substantial" to "almost perfect" reproducibility and an "almost perfect" reliability.
Conclusion
This study confirmed the possibility of generating "CLASS" with the localised centroid of the femoral and tibial ACL footprints from a 3D volumetric model. "CLASS" also showed that these footprints were easily identified on standard anteroposterior and lateral X-Ray views of the same patient, thus allowing an individual identification of the anatomical femoral and tibial ACL's footprints.
Level of evidence
Level IV diagnostic study
Fractures in the elderly population are a major increasing issue for any healthcare institution, associated with the growing life expectancy. Proximal tibial fractures affect the metaphyseal bone with or without articular extension, in 5 to 11% of all tibia fracture. Treatment options such as plate fixation, intramedullary nailing or even primary total knee arthroplasty are accepted valuable options. However, specific age-related risk factors such as osteoporosis, arthritis, multiple comorbidities and soft-tissue impairment shall also be taken in consideration as they may lead to severe complications if not fully understood. Therefore, a hybrid tibio-tibial external fixator may be considered as a valid surgical option for primary and definitive treatment care of these fractures especially if associated with soft-tissue damage. We report a retrospective observational analysis of three cases of closed extra-articular proximal tibia fractures associated with soft-tissue impairment in a geriatric population and treated with a hybrid external fixator (TenXor, Stryker). The fractures were classified according to the AO, as metaphyseal fractures (AO 41A2.1, 41A3.3). The post-operative protocol was standardized, with immediate full weight bearing. Complete consolidation of the fractures was obtained at 6 months. There were no pin tract infection and removal of the material has been done at 6 months. No cut-out of the proximal tibial wires was observed. The primary and definitive care of proximal tibial fractures by a hybrid external fixator appears to be a valuable surgical option in geriatric patients especially when associated with poor soft tissue coverage. The major advantage of this technique, acknowledging the longer bone consolidation process, is to avoid additional insult to the soft tissues. This surgical option gathers further treatment perspectives in the elderly population especially in cases of soft tissue limitations.
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