Analysis of cement mantles in collared versus collarless femoral components.

The purpose of this study was to compare the cement mantles of 100 consecutive collared cemented stems with those of 100 consecutive collarless cemented stems of similar design. All stems were implanted by the same surgeon. Two independent examiners retrospectively reviewed the results. Between the 2 femoral stem types, there was no statistical difference in proximal medial cement mantle size, stem orientation, canal-fill percentage, or cement mantle grade, and there was no radiographic difference in cement mantle quality or stem position.