Well, 'The Wounded Genius' is a great 'Tony Stark injured' fanfiction. It's set right after a big battle where Tony gets seriously hurt. The story is really good at showing his struggle to get back on his feet and continue being Iron Man. And then there's 'Tony's Trial of Pain'. This one not only deals with his physical injury but also the emotional toll it takes on him. It's a really in - depth look at the character. There are also a bunch of others if you search on Archive of Our Own.
There are many 'Tony Stark injured' fanfictions out there. For example, 'Healing the Hero' is a fanfic that has an interesting take on his injury. It shows how the other characters in the Marvel world, like Pepper and Rhodey, react and help him through it. It also has some great moments of Tony reflecting on his life while he's recovering. Another one is 'The Road to Recovery for Iron Man' which details his journey from being severely injured to slowly getting back to his normal self. It's full of action and emotional moments.
One popular 'Tony Stark injured' fanfiction might be 'Recovery Road'. In this fic, it shows how Tony deals with his injuries both physically and mentally. It delves deep into his character, showing his vulnerability and strength at the same time. Another could be 'Injured but Unbroken' which focuses on how his friends in the Avengers support him during his recovery process. There are also some on fanfiction.net that explore different scenarios of his injury and how it impacts the Marvel universe.