Is the prayer of one who gestures for bowing and prostration while sitting permissible, even though he is able to prostrate, due to fear of harming a surgical wound?

It is well-known that standing, bowing, and prostrating are pillars of prayer, and prayer is not valid without them, except for a recognized legitimate excuse. Therefore, whoever is able to perform a pillar is not permitted to abandon it, even if they are unable to perform others.

Thus, prayers that were performed with the omission of pillars that the worshiper was able to perform must be made up, unless doing so would cause unusual hardship or delay recovery, in which case there is no blame or requirement for making up the prayers.