We investigated annual changes with respect to the period taken from the onset of illness to the prescription of lower extremity orthoses in hemiplegic patients after stroke, retrospectively from 1992 to 2007, in an acute phase hospital. We subdivided the initial period into three parts : the period of time from onset to the beginning of rehabilitation (T1), from the beginning of rehabilitation to the beginning of rehabilitation in the training room (T2), and from the beginning of rehabilitation in the training room to prescription (T3). Analysis was made with respect to the relationship between each of the aforementioned periods and the prescription time. Furthermore, we also analyzed the relationship between the length of stay of patients who had been prescribed orthoses, and the prescription time. The prescription time was found to have gradually shortened over time ; moreover, the period in question shortened in a rapid way in 2001, as compared with previous years (p <0.05). T3 showed the highest correlation coefficient (r =0.99), and the length of stay also exhibited a high correlation coefficient (r =0.97). We assume that the annual changes in prescription time might have been due to various underlying factors, namely, social factors, such as a shortening of the length of stay, caused by the differentiation of roles among hospitals, as well as medical factors such as the development of acute phase rehabilitation, or changes in perception of the ways in which orthoses may be used for stroke patients by rehabilitation staff.