Background:
A longer operative time has been previously recognized as a risk factor for
short-term complications after various orthopaedic procedures; however, it
has yet to be investigated as an independent risk factor for postoperative
complications after anterior cruciate ligament (ACL) reconstruction.
Purpose:
To identify whether a longer operative time in ACL reconstruction is an
independent risk factor for the development of postoperative complications,
hospital readmissions, or an extended length of stay within 30 days of the
index procedure.
Study Design:
Descriptive epidemiology study.
Methods:
Patients undergoing ACL reconstruction between 2005 and 2016 were identified
using the American College of Surgeons National Surgical Quality Improvement
Program (ACS-NSQIP) database. Cases with concomitant procedures were
excluded from the analysis. We evaluated the association between operative
time and preoperative variables such as patient age, sex, body mass index,
comorbidities, and procedure. Correlations between adverse events and
operative time, while controlling for the above preoperative variables, were
calculated using multivariate Poisson regression with robust error
variance.
Results:
A total of 14,159 procedures were included in this investigation. The mean
patient age was 32.6 ± 10.8 years, the mean body mass index was 27.7 ± 6.5
kg/m
2
, and the mean operative time was 89.7 ± 28.6 minutes.
Patients who were between the ages of 18 and 30 years (mean operative time,
95.1 ± 27.8 minutes; relative risk [RR], 17.7;
P
<
.001), male (mean operative time, 91.9 ± 28.3 minutes; RR, 4.7;
P
< .001), and nondiabetic (mean operative time,
89.8 ± 28.6 minutes; RR, 7.1;
P
= .011) were associated
with a longer operative duration. The overall complication rate was 1.1%.
After adjusting for demographic characteristics and procedures, 15-minute
incremental increases in operative duration were associated with an
increased risk of deep vein thrombosis (RR, 1.12;
P
=
.042), surgical site infections (RR, 1.21;
P
= .001), and
sepsis (RR, 1.66;
P
< .001) as well as increased
readmission rates (RR, 1.23;
P
= .001) and an extended
length of stay (RR, 1.18;
P
= .008).
Conclusion:
While the overall adverse risk rate after ACL reconstruction remains low,
marginal increases in operative time are associated with an increased risk
of adverse events such as deep vein thrombosis, surgical site infections,
sepsis, an extended length of stay, and readmissions. Thus, the operating
physician and surgical staff should make all efforts to coordinate and
prepare for each case to maximize surgical efficiency.