 All patients will undergo a needle biopsy of their ipsilateral iliac crest while under general anesthesia for their surgical procedure. The bone biopsy will be taken through the surgical incision used for placing the reamer irrigator aspirator in most cases. If a patient requires only a small incision for placing the reamer, which precludes needle biopsy through the surgical incision, then the needle biopsy will occur through a small 1 cm incision directly over the iliac crest. The iliac crest biopsy will also be immediately placed on dry ice and transported to the Department of Surgery laboratories of Dr. Chaudry for evaluation. After the samples have been obtained, the scheduled surgical procedure will be completed. 