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Purpose:Osteopetrosisisanuncommon,inheritedbonedysplasiadisease,characterizedbyosteosclerosis,brittlebone,obliterationofthemedullarycavity,a Method:Ifthepatienthaspainanddysfunction,totaljointarthroplastyisoftenthetreatmentofchoicebutpresentsmanyintraoperativeandpostoperativec Result:Thisarticledescribesacaseoflefthiposteoarthritisandrightkneeosteoarthritisinapatientwithosteopetrosis.