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Conclusions:We conclude that with use of the present selection criteria, Nucleoplasty is very effective longtermtreatment for lumbar radicular pain. We recommend modifying the criteria to include onlythose cases with lumbar radicular pain due to protrusion whose annular integrity is confirmedvia MRI and by either selective nerve root blocks and to exclude cases with axial pain.Saturday, October 9, 2010, 13:30-14:20Session B20: Hip ArthroplastyFifteen Year Results of Hybrid THA Using a Precoated Femoral Stem: ASingle Center Experience.*Won Yong Shon - Korea University Hospital (Kuro) - Seoul, Republic of KoreaPranit Chotai - Korea University Guro Hospital - Seoul, South KoreaVinay Kumar Siddaraju - Korea University Guro Hospital - Seoul, South Korea*Email: wonyong@kumc.or.krPurpose:In an effort to increase the durability of cemented total hip arthroplasties (THA), femoral stemswere precoated using polymethlymethacrylate (PMMA). One such design is Harris precoat plusand centralign design (Zimmer, Warsaw, Indiana). The reports on these particular designs arevariable, ranging from good survival to early failures, studied over short to medium term. Earlyfailures have been attributed, most of the time to debonding at cement-bone interface. In viewof lack of long term and variable results, we reviewed the results of primary hybrid THAperformed during October 1990 to December 1995, using a PMMA coated, cemented femoralprosthesis and contemporary cementing techniques.Materials and Methods:121 patients (136 hips) underwent primary THA using one of the precoated femoral stemsduring the study period. Thirty-five patients (36 hips) died and 23 patients (23 hips) were lost tofollow-up due to some reasons. Two hips (2 patients) were revised for postoperative infectionand hence, not included in study. Collectively, 75 hips (61 patients) were available for clinicaland radiological reviews until the last follow-up, with an average follow-up period of 15.5 years(range, 14 to 18.3 years). The average age of the patients at the time of the index surgery was53.6 years (range, 24 to 82 years). There were 43 males (55 hips) and 18 females (20 hips).Acetabular components used in these 75 hips were Harris Galante porous (HGP) cups in 69 hipsand CLS Expansion cup (Protek, AG, Bern) in six hips. The mean age of 61 patients (75 hips)who were available for latest follow-up at December 2009, was 46 years (range, 22-65 years).Third generation cementing techniques and distal cement plug but no centralizer was used in allcases. All surgeries were performed by same surgeon at a single institute.Results:23 femoral stems were revised, 20 for aseptic loosening (8 Precoat plus and 12 Centralign) and3 for periprosthetic fracture with loosening (1 Precoat plus and 2 Centralign). The cementing ofthe femoral stem was grade A in 29 hips (39%), grade B in 16 (21%), C1 in 6 (8%) and gradeC2 in 24 (32%). 21 of 24 hips which showed definitive loosening in radiogram had had cementfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]