Retrospective cohort study of 56,216 primary TKAs from the Kaiser Permanente registry (2001–2009). Used Cox regression and a validated infection surveillance algorithm to identify independent patient, surgical, and hospital risk factors for deep surgical site infection. Addresses which patient diagnoses, comorbidities, and operative decisions actually move the needle on infection risk.
The two highest-risk scenarios for TKA infection are not the obese diabetic — they are the patient with osteonecrosis or posttraumatic arthritis. When you see either of these as the operative indication, counsel the patient explicitly and optimize everything modifiable before proceeding.
For the standard-risk patient, use antibiotic irrigation and keep the case efficient. Do not reflexively add antibiotic-laden cement in routine primary TKA; this registry shows it does not reduce infection and is independently associated with higher rates, most likely because surgeons select it for already-complex cases.
Operative time is a controllable variable: every quarter-hour saved reduces infection risk by 9%. That is a meaningful number when a case is running long and you are deciding whether to push through or pause and reassess.
Retrospective cohort study of 56,216 primary TKAs from the Kaiser Permanente registry (2001–2009). Used Cox regression and a validated infection surveillance algorithm to identify independent patient, surgical, and hospital risk factors for deep surgical site infection. Addresses which patient diagnoses, comorbidities, and operative decisions actually move the needle on infection risk.
The two highest-risk scenarios for TKA infection are not the obese diabetic — they are the patient with osteonecrosis or posttraumatic arthritis. When you see either of these as the operative indication, counsel the patient explicitly and optimize everything modifiable before proceeding.
For the standard-risk patient, use antibiotic irrigation and keep the case efficient. Do not reflexively add antibiotic-laden cement in routine primary TKA; this registry shows it does not reduce infection and is independently associated with higher rates, most likely because surgeons select it for already-complex cases.
Operative time is a controllable variable: every quarter-hour saved reduces infection risk by 9%. That is a meaningful number when a case is running long and you are deciding whether to push through or pause and reassess.