Prospective study in 34 long bone nonunion patients comparing standard intraoperative cultures against multiplex PCR-mass spectrometry (Ibis T5000) and FISH. The central question: can a negative culture actually rule out infection when deciding how to treat a nonunion? All three detection methods were run in parallel, with surgeons blinded to molecular results.
When you take a nonunion back to the OR, a negative culture has historically provided reassurance that infection is not contributing to the failure to heal. This paper challenges that assumption directly. In 22 of 30 molecularly confirmed infections, cultures returned negative. If you treat based on culture alone, you are missing infection in the majority of cases where it exists.
When managing a nonunion, consider that the infection rate detected by molecular methods approaches 88%. Surgical debridement alone, without targeted antibiotic coverage, may be inadequate even when cultures are negative.
At minimum, hold OR cultures for 14 days. P. Acnes will not grow in the standard 5-day window, yet it was present in 26% of cases here. Missing it means missing a treatable pathogen that may be sabotaging healing.
Prospective study in 34 long bone nonunion patients comparing standard intraoperative cultures against multiplex PCR-mass spectrometry (Ibis T5000) and FISH. The central question: can a negative culture actually rule out infection when deciding how to treat a nonunion? All three detection methods were run in parallel, with surgeons blinded to molecular results.
When you take a nonunion back to the OR, a negative culture has historically provided reassurance that infection is not contributing to the failure to heal. This paper challenges that assumption directly. In 22 of 30 molecularly confirmed infections, cultures returned negative. If you treat based on culture alone, you are missing infection in the majority of cases where it exists.
When managing a nonunion, consider that the infection rate detected by molecular methods approaches 88%. Surgical debridement alone, without targeted antibiotic coverage, may be inadequate even when cultures are negative.
At minimum, hold OR cultures for 14 days. P. Acnes will not grow in the standard 5-day window, yet it was present in 26% of cases here. Missing it means missing a treatable pathogen that may be sabotaging healing.