Fig 1.
(a) Blade Screw DHS (ODRC Dynamic Hip Screw System, Chin Bone Corp., Taiwan; US FDA 510(k): K103015). (b) Radiographs of an 101 years-old woman showing fixation with a Blade Screw DHS post-operation. (c) The design and components of Blade Screw DHS.
Fig 2.
(a) Size of a test block; (b) Cellular rigid polyurethane foam (Type 1522–11) used to simulate a mild osteoporotic bone; (c) Open-cell rigid polyurethane foam (Type 1522–524) used to simulate a severely osteoporotic bone.
Fig 3.
A femoral head test model was fixed in the HIPS system and subjected to multi-axial loading.
Fig 4.
(a) Specimen after lag screw excessive migration (≥10 mm); (b) TAD values of the Blade Screw and traditional DHS groups immediately after surgery and at 3-months follow-up.
Table 1.
Displacement of the femoral head (DFH), displacement of the distal lag screw (DDLS), varus collapse (VC), and femoral head rotation around the neck axis (RN) of the Blade Screw and traditional DHS.