Biomechanics study of interal fixation with hol-low-compression-screw and composite calcium phosphate cement of osteoporotic femoral neck

Objective To evaluate the biomechanics of hollow-compression-screw in the osteoporotic femoral neck with composite c alcium phosphate cement (CCPC).Methods Sixteen femurs of superior segment were randomly divided into two groups:augmentation group and non-augmentation group.CCPC was used in augmentation group.Result Augmentation with CCPC would improve the initial mobile force of hollow-compression-screw,the ini tial mobile force and the maximal axial pull-out strength for augmentation group,non-augmentation group in-creased from(192.7±14.0)N and(202.8±14.0)N to(328.5±34.7)N and(347.8±31.2)N.There was significant difference of two groups(P <0.01).Conclusion CCPC can enhance hollow-compressio n-screw fixation in osteoporotic fe moral neck.