How have courts treated injuries sustained by a police officer who sustained injuries to his knees and hands during an assault?

Similarly, in People v. Lara (1994) 30 Cal.App.4th 658 (Lara), the officer bruised both his knees, sustained numerous cuts and abrasions on hands, and was exposed to the appellant's blood during an altercation. The officer went to the emergency room where medical personnel "cleaned his wounds, gave him supplies for scrubbing himself later, 'checked out [his] knees to make sure there was no ligament damage or anything[,]' and 'treated the contusions on [his] knees.'" (Id. at p. 667.) In affirming the appellant's conviction for battery with injury on a peace officer, the court of appeal concluded that the evidence of the medical treatment that the officer received was sufficient to support a finding that he suffered an injury within the meaning of section 243. (Id. at pp. 667-668.)