en آسیب شناسی ورزشی و حرکات اصلاحی Sport injury and corrective exercises پژوهشي Research <p style="text-align: justify;"><strong>Purpose:</strong> Knee osteoarthritis (OA) is believed to be an important risk factor for falling. Total&nbsp;knee replacement (TKR) is a commonly used choice when other methods are not satisfactory.&nbsp;Proprioception impairment, risk of falling and balance disorder are within the main complications&nbsp;of this method. While multiple protocols have been suggested for TKR, efficacy of early<br> isotonic exercise therapy aimed at improving body balance after TKR has not been thoroughly&nbsp;investigated.<br> <strong>Methods:</strong> In this quasi-experimental study, ten female patients with severe OA, sampled by nonrandomized&nbsp;convenient method were randomly assigned into either &ldquo;routine&rdquo;or &ldquo;early isotonic&nbsp;exercise&rdquo; groups. The subjects were undergone TKR surgery. The rehabilitation process (being&nbsp;the same for both groups until the second week) was initiated the day after surgery and lasted for&nbsp;6 weeks. From the second week, the experimental group received progressive, isotonic exercises,&nbsp;in addition to the routine rehabilitation protocol. Static balance was assessed prior to surgery and&nbsp;after the rehabilitation process in both groups by Sharpened Romberg tests.<br> <strong>Results: </strong>In both groups, static balance was significantly enhanced after surgery and rehabilitation&nbsp;(P<0.000). Prior to surgery the groups were indifferent according to their static balance scores&nbsp;(P=0.423) but, after surgery and rehabilitation, the patients receiving early isotonic exercise in&nbsp;addition to routine physical therapy, were significantly in better balance condition comparing the&nbsp;control group (P=0.000).<br> <strong>Conclusion:</strong> Routine physical therapy with and without early isotonic exercise therapy enhances&nbsp;static balance but, the balance improvement was more pronounced with this type of exercise.&nbsp;Early administration of isotonic exercise therapy in addition to the routine physical therapy&nbsp;program may enhance balance and prevent fall in patients with TKR.</p> Progressive isotonic exercise,Balance control, Total knee replacement 55 59 http://ptj.uswr.ac.ir/browse.php?a_code=A-10-200-1&slc_lang=en&sid=1 Amir Hossein Kahlaee raziehyousefian@yahoo.com No Physical Education and Sport Sciences Department, Kharazmi University, Tehran, Iran. Heidar Sadeghi sadeghih@yahoo.com No Physical Education and Sport Sciences Department, Kharazmi University, Tehran, Iran. Aliasghar Jamebozorgi aas.bozorgi@yahoo.com No Occupational Therapy Department, Faculty of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Razieh Yousefian Molla raziehyousefian@yahoo.com Yes APhysical Education and Sport Sciences Department, Tehran Branch Center, Islamic Azad University, Tehran, Iran.