A 75-year-old woman presented a cauda equina syndrome with epiconus involvement from the compression fractures of T12, L1, and L3 vertebrae as a result of fall accident. Cystometrogram performed at three months after the injury showed a small bladder capacity and low compliance. Anticholinergic medications including intravesical instillation of oxybutynin solution failed to increase the bladder capacity or lower the intravesical pressure. Bladder distension therapy using normal saline infusion with a volume surpassing the previous measured maximal bladder capacity was per-formed. The procedures were repeated four times per day. At the fifth day of the distension therapy, the patient complained of acute low abdominal pain and gross hematuria. The cystogram revealed the extraperitoneal bladder rupture. The patient was treated successfully with antibiotics and continuous urinary drainage through the Foley catheter for 14 days. We report a case of extraperitoneal bladder rupture during the bladder distension therapy. (J Korean Acad Rehab Med 2002; 26: 355-357)