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Poster: 99Dislocation After Bipolar Hemiarthroplasty in Patients WithNeuromuscular Diseases*Kuen Tak Suh - Pusan National University School of Medicine - Yangsan, KoreaJeung Il Kim - Pusan National University School of Medicine - Busan, KoreaJung Sub Lee - Pusan National University School of Medicine - Busan, KoreaHyung Joon Cho - Pusan National University Yangsan Hospital - Yangsan, KoreaJung Yun Bae - Pusan National University Yangsan Hospital - Yangsan, KoareHong Seok Lee - Pusan National University Hospital - Busan, KoraeDae Woong Kim - Jangyoo Hanseo Hospital - Kimhae, KoreaWon Ro Park - Pusan National University Yangsan Hospital - Yangsan, Korea*Email: kuentak@pusan.ac.krAims: The patients with neuromuscular disease are known for having higher incidence ofpostoperative dislocation after bipolar hemiarthroplasty. In this study, the incidence ofpostoperative dislocation and its prevention after bipolar hemiarthroplasty were reviewed inpatients with neuromuscular disease. Methods: Among the patients who underwent bipolarhemiarthroplasty due to fractures of the femoral neck between 1996 and 2008, 42 patients withneuromuscular disease, including cerebral infarction (24 patients), dementia (8 patients),Parkinsonism (7 patients), and poliomyelitis (3 patients), were chosen for comparative analysisagainst 148 patients with no history of neuromuscular disease. Leg length and femoral offsetwere adjusted in order to fulfill the real size of non-lesion side leg by preoperative templating.Intraoperative stability was tested, and posterior soft tissue repair was performed in all patients.Results: The incidence of dislocation in patients with neuromuscular disease and patientswithout neuromuscular disease were 2/42 (4.8%) and 3/148 (2.0%), respectively, which had nostatistically significant difference (p=0.330). The postoperative leg length discrepancy of twogroup was -1.7 mm and -0.7 mm, respectively, with no statistically significant difference(p=0.586). Femoral offset was 2.3 mm and 1.6 mm, respectively, which had no statisticallysignificant difference (p=0.762). Manual reduction of dislocated hip was done under conditionof general anesthesia to gain appropriate muscle relaxation. All reduction was successful donewithout complications of bipolar hemiarthroplasty dissociation and neither had the redislocationoccurred. Conclusions: Incidence of dislocation after bipolar hemiarthroplasty inpatients with neuromuscular disease can be lowered by delicate preoperative planning,intraoperative stability testing, and recovering tensile strength of soft tissue using posterior softtissue repair.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]