Fig. 5

Correlation between preoperative Hounsfield unit (HU) value of bone penetration area and mean depth of penetration. A Correlation between bone penetration and preoperative HU values in the HM group. B Correlation between bone penetration and preoperative HU values in the VM group. In both groups, the correlation between preoperative HU values and mean penetration was negative. The negative correlation was larger in the HM group than in the VM group. HM hand mixing + hand packing, HU Hounsfield unit, VM vacuum mixing + cement gun