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Source: https://writers.stackexchange.com/a/39726
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

I'd say mention it whenever it affects the character's thoughts or behavior, or the outcome of plot elements. If the injury has no affects on the choices of characters or on the plot, then you can just say "It hurt, but it got better".

"The group started talking about changing the plan to a long hike tomorrow, and our hero put down his food. Our hero had lost his appetite thinking about making that journey on his wounded leg."

"Our hero clutched his wound as he walked and stumbled from chair to chair, and was unusually grumpy to his friends."

"Our hero took much longer to get ready to go, and avoided eye contact with Our Allied Antagonist, hoping to avoid ridicule."

How a person deals with an injury says a lot about them. Who do they share their pain with and who do they hide it from? Are they dejected or determined about the healing process? Do they stubbornly refuse to acknowledge how badly they are really hurt, or do they assess their limitations realistically and strive to nurture themselves back to health? Do they become grumpy, sleepy? Do they project their frustration or pain onto other story elements? Sometimes a traumatic injury can cause significant social tension only because the injured is looking for any excuse to vent anger and frustration, or because the injured is grumpy or needy and someone else gets easily offended.

Original score: 2