Fig. 1

a. Group 1 - Assembly with two parallel cannulated screws in the inferior portion of the femoral neck + the Pauwels screw: fluoroscopy in the coronal and sagittal planes, and photographs of one of the specimens prior to testing, anterior and lateral views. Note the parallel arrangement of the two inferior screws in the coronal and sagittal planes. Also note how the Pauwels screw occupies the central space of the femoral neck in the sagittal plane; b. Group 2 - Assembly with two parallel cannulated screws in the inferior portion of the femoral neck + the Pauwels screw + medial plate: fluoroscopy in the coronal and sagittal planes, and photographs of one of the specimens prior to testing, anterior and lateral views. Note the parallel arrangement of the two inferior screws in the coronal and sagittal planes. Also note how the Pauwels screw occupies the central space of the femoral neck in the sagittal plane. Observe that only 1 of the 4 screws of the plate was placed proximally to the osteotomy site – this was done to reproduce what normally occurs in the clinical situation, where it is almost impossible in the majority of patients to position the plate in a complete medial position – it is more anteromedial to the lesser trochanter – and also to put it more proximally, due to the inferior capsule