An MRI-Based Patient-Specific Computational Framework for the Calculation of Range of Motion of Total Hip Replacements

The calculation of range motion (ROM) is a key factor during preoperative planning total hip replacements (THR), to reduce the risk impingement and dislocation artificial joint. To support assessment THR, magnetic resonance imaging (MRI)-based computational framework was generated; this enabled estimation patient-specific ROM type (bone-to-bone, implant-to-bone, implant-to-implant) postoperatively, using three-dimensional computer-aided design (CAD) visualize typical clinical joint movements. Hence, CAD models from 19 patients were generated MRI scans conventional system (Bicontact® stem Plasmacup® SC acetabular cup with ceramic-on-ceramic bearing) implanted virtually. As verification framework, compared between preoperatively planned postoperatively reconstructed situations; derived based on postoperative radiographs (n = 6 patients) different clinically relevant data analysis revealed there no significant difference (∆ROM) maximum flexion (∆ROM 0°, p 0.854) internal rotation 1.8°, 0.917). Contrarily, minor differences observed for external 9°, 0.046). Impingement, all three types, in good agreement scenarios calculated reached physiological levels movement; however, it exceeded rotation. Patients, where implant-to-implant detected, higher ROMs than bone-to-bone impingement. proposed provides capability predict THRs.