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Conclusions:To the best our knowledge, this is the first series using cemented metal on metal cups within areinforcement / reconstruction ring for revision hip arthroplasty. Excellent cemented fixation ofthe cup, manufactured for cementless fixation, was obtained at surgery with no evidence ofloosening, and no dislocations at minimum 24 months follow up.Saturday, October 9, 2010, 16:00-16:50Session B22: Arthroplasty- Getting it Right!An Update of Non-Invasive Extendable Endoprostheses in PaediatricTumour Surgery - Dual Centre Study.*Kishan Gokaraju - Sarcoma Unit, Royal National Orthopaedic Hospital - Stanmore, EnglandJonathan Miles - Royal National Orthopaedic Hospital - London, UKGordon Blunn - Royal National Orthopaedic Hospital - London, UKPaul Unwin - Stanmore Implants Worldwide - Stanmore, EnglandRobin Pollock - Royal National Orthopaedic Hospital - Stanmore, EnglandJohn Skinner - Royal National Orthopaedic Hospital Trust - Stanmore, UKRoger Tillman - - ,Lee Jeys - Royal Orthopaedic Hospital - Birmingham, englandAdesegun Abudi - royal orthopaedic hospital - Birmingham, EnglandTim Briggs - . - London, UK*Email: kgokaraju@hotmail.comNon-invasive expandable prostheses for limb salvage tumour surgery were first used in 2002.These implants allow ongoing lengthening of the operated limb to maintain limb-lengthequality and function while avoiding unnecessary repeat surgeries and the phenomenon ofanniversary operations.A large series of skeletally immature patients have been treated with these implants at the twoleading orthopaedic oncology centres in England (Royal National Orthopaedic Hospital,Stanmore, and Royal Orthopaedic Hospital, Birmingham).An up to date review of these patients has been made, documenting the relevant diagnoses, sitesof tumour and types of implant used. 87 patients were assessed, with an age range of 5 to 17years and follow up range of up to 88 months.Primary diagnosis was osteosarcoma, followed by Ewing’s sarcoma. We implanted distalfemoral, proximal femoral, total femoral and proximal tibial prostheses. All implants involvingthe knee joint used a rotating hinge knee. 6 implants reached maximum length and wererevised. 8 implants had issues with lengthening but only 4 of these were identified as being dueto failure of the lengthening mechanism and were revised successfully. Deep infection waslimited to 5% of patients.Overall satisfaction was high with the patients avoiding operative lengthening and tolerating thenon-invasive lengthenings well. Combined with satisfactory survivorship and functionalfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]