Operating room records indicate that 130 joint replacements have been performed.

To determine the infection rate per 100 procedures for total hip replacements, use the following formula:

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Thus, the correct answer isB. 2.9per 100 procedures.

CBIC Infection Control Reference

The methodology of calculating SSI rates aligns with guidelines from theNational HealthcareSafety Network (NHSN)and standardized infection ratio (SIR) models used for hospital-specific SSI rates​.