Beitragstitel | 3D Printing of MR-based 3D-models for SCFE patients for patient-specific preoperative planning of modified Dunn procedure |
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Beitragscode | P49 |
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Präsentationsform | Poster |
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Abstract |
Objectives Slipped capital femoral epiphyses (SCFE) is a common pediatric hip disease with the risk of osteoarthritis and impingement deformities. MRI-based 3D-models would offer radiation-free patient-specific preoperative planning. Therefore, we investigated (1)bone segmentation (2)feasibility of 3D-printing and of 3D impingement-simulation using MRI 3D-models and (3)short-term clinical followup. Methods A retrospective study involving of 10 symptomatic patients (10 hips) with SCFE was performed. Mean age was 13±2 years(50% male patients). Six patients had severe SCFE(four had moderate SCFE). All patients underwent preoperative hip MR(2016-2019) with pelvic coronal high-resolution images(T1 Starvibe). Slice thickness was 1.2mm. Semi-automatic MRI-based 3D segmentation (software AMIRA) and 3D-printing of plastic 3D-models was performed. The virtual 3D models were used for dynamic 3D impingement-simulation. All patients underwent surgical treatment, eight patients underwent modified-Dunn-procedure. Results (1)MRI-based 3D segmentation was feasible in all patients(100%, duration of 4.5 hours, mean 277±52 minutes). (2)3D-printing of the 3D-models was feasible in all patients(100%). 3D-models were considered helpful for preoperative planning by the treating surgeons. Dynamic 3D impingement-simulation was feasible in 6 patients(6 hips) and enabled visualization of femoral and acetabular impingement location. (3)Hip range of motion was symmetrical and clinical outcome was good at short term followup. Slip angle improved significantly (p < 0.001) from preoperative 54±15° (40-70) to postoperative 3±5° (2-4). Conclusion MRI-based 3D-models for SCFE patients were feasible for all patients. 3D-models can be used for 3D-printing and for impingement-simulation. This could aid for patient-specific preoperative planning. MRI-based 3D-models are radiation-free and could be used instead of CT-based 3D-models in the future. |