after THR surgery by 5 days and on follow up x-ray there was small island of heterotropic bone around the joint in asymptomatic patient the treatment

after THR surgery by 5 days and on follow up x-ray there was small island of heterotropic bone around the joint in asymptomatic patient the treatment is
a. radiotherapy
b. open surgery and removal
c. indomethacin 75mg /day
d, reassurance and observation
(c) ??