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mid-shaft radial replacement and 6 patients had distal radial replacements with wristarthrodesis. The indications for replacement included metastatic lesions from renal cellcarcinoma, primary giant cell tumours, ewings' sarcoma, chondroblastoma, radio-ulnarsynostosis and benign fibrous histiocytoma. The average follow up was 5 years and 6 months(range 3 months - 18 years). Four patients died as a result of dissemination of renal cellcarcinoma and two patients were lost to follow-up. There were no complications with theprosthesis or infection. Clinically and radiographically there was no loosening demonstrated at18 years with secure fixation of implants. Two patients developed interossoeus nerve palsieswhich partially recovered. Functional outcomes of the elbow were assessed using the Mayoperformance score with patients achieving a mean score of 85 postoperatively (range 65-95).All but one patient had full range of motion of the elbow. The patient with radio-ulnarsynostosis had a 25 degree fixed flexion pot-operatively. Although the distal radialreplacements had decreased range of movements of the wrist due to arthrodesis, they hadexcellent functional outcomes. Only one patient required revision surgery due to post-traumaticloosening of the implant. Our results of the use of endoprosthetic replacement of radius in thetreatment of tumours are encouraging with regards to survivorship of the implant and functionaloutcome. This type of treatment results in an early return to daily routine activties, goodfunctional outcome and patient satisfaction.FiguresFigure 1 Figure 2 Figure 3 Figure 4Friday, October 8, 2010, 16:30-17:20Session A16: Computer Navigation in THAIntroductionAccuracy of Robotically Assisted Acetabular Cup ImplantationLawrence Dorr - Good Samaritan Hospital - Los Angeles, USAMark Pagnano - Mayo Clinic - Rochester, USARobert Trousdale - Mayo Clinic - Rochester, USAMatthew Thompson - MAKO Surgical Corp - Ft Lauderdale, USAMiranda Jamieson - MAKO Surgical Corp - Ft Lauderdale, USA*Michael Conditt - MAKO Surgical Corp. - Boerne, USA*Email: mconditt@makosurgical.comRecent gains in knowledge reveal that the ideal acetabular cup position is in a narrower rangethan previously appreciated and that position is likely different based on femoral componentanteversion. For that reason more accurate acetabular cup positioning techniques will beimportant for contemporary THA. It is well known that malalignment of the acetabularcomponent in THA may result in dislocation, reduced range of motion or accelerated wear. Upfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]