Compressive Properties of Commercially Available PVC Foams Intended for Use as Mechanical Models for Human Cancellous Bone

Mechanical testing of cephalomedullary nail lag screws after the addition of hydroxyapatite substitutes

“…Rotational stability and pull-out strength with the addition of bone cement in the PFNA-II blade were reported to strengthen femoral head and blade fixation. [8] It has also been reported that the use of bone cement to fill the femoral head in hip nail revision surgery involving a PFNA-II blade showed higher pull-out strength and rotational torque than without the use of bone cement. [15] However, because bone cement may leak into the fracture site and joint, it is not recommended for use in revision surgery of cut-out and cut-through cases, although it may be used carefully in blade back-out cases.…”

“…[6] We conducted push/pull-out strength and rotational torque tests according to the testing method outlined by Suhm et al [7] Ten cellular rigid polyurethane foam (#1522-10-10 PCF, Sawbones: Density: 0.16 g/cc; yield strength: 2.3 MPa), which has a cell size that is closer to that of human cancellous bone and is most commonly used for testing subsidence, press-fit devices, and cement augmentation, was chosen for all push-out, pull-out, and rotational torque tests to provide consistent test results mimicking osteoporotic bone (average yield strength of osteoporotic bone: 2.5 MPa). [8,9] 2.1. Push-out test Push-out strength was measured using 3 short femoral nail designs in a PCF cellular block mimicking osteoporotic cancellous bone, [8] with and without NEOBRACE.…”

“…[8,9] 2.1. Push-out test Push-out strength was measured using 3 short femoral nail designs in a PCF cellular block mimicking osteoporotic cancellous bone, [8] with and without NEOBRACE. A desktoptype precision universal testing machine, Autograph AG-1 (Shimadzu Corporation, Tokyo, Japan), was used to evaluate the push-out strength of the screw.…”