♦ 2022-08-10	Program has been updated.
	♦ 2022-07-25	Registration, For Participants, Presentation Guideline has been updated.
	♦ 2022-05-23	Call for Abstracts has been updated.
	♦ 2022-03-11	"Announcement of 31st JKCOS on the Web" has been posted.
	♦ 2021-01-12	"Announcement of 31st JKCOS Postpone" has been posted.
	♦ 2020-07-01	The 31st Japanese-Korean Combined Orthopaedic Symposium site opened.