Belmont (2014) — Thirty-day postoperative complications and mortality following total knee arthroplasty: incidence and risk factors among a national sample of 15,321 patients.

Thirty-Day Postoperative Complications and Mortality Following Total Knee Arthroplasty: Incidence and Risk Factors among a National Sample of 15,321 Patients.

·J Bone Joint Surg Am·2014·433 citations·Hip & Knee

Retrospective cohort study using the ACS NSQIP database (2006–2010) analyzing 30-day postoperative mortality and complications in 15,321 patients undergoing primary unilateral TKA. Uses multivariate logistic regression to identify independent patient-level and surgical risk factors for mortality, systemic complications, local complications, and prolonged hospital stay.

Study Snapshot

Design

Retrospective cohort

Setting: National (ACS NSQIP), multiple US hospitals

Funding: None

Objective

Determine whether patient factors predict 30-day mortality and complications after total knee arthroplasty

Outcome(s)

30-day postoperative mortality and complication rate

Subjects

15,321 primary unilateral TKA patients, ACS NSQIP 2006–2010

Inclusion

Primary unilateral TKA (CPT 27447)

Exclusion

Bilateral or staged knee arthroplasty

Follow-up

30 days

Statistics

Univariate logistic regressionChi-squareMultivariate logistic regressionHosmer-Lemeshow goodness-of-fit

Key Findings

30-day mortality was 0.18%; only diabetes (OR 2.99) and increasing age (OR 1.12 per year) independently predicted death — diabetes raised mortality risk by ~300%
Overall complication rate was 5.55%; the four independent predictors of any complication in rank order were age ≥80, operative time >135 min, ASA ≥3, and BMI ≥40
Pulmonary embolism was the most common major systemic complication (0.78%); UTI (1.49%) and DVT (1.34%) topped the minor systemic list — 52% of VTE events occurred within the first 3 postoperative days
Cardiac disease drove a fourfold increase in minor local complication risk (OR 4.32); BMI ≥40 — not merely BMI ≥30 — was the obesity threshold that independently predicted both overall complications and wound complications
Combined mortality-or-major-complication rate was 2.22%; among the 27 deaths, 67% had sustained a concurrent complication, most often cardiac arrest, shock, or renal failure

Clinical Relevance

When consenting a TKA patient, flag diabetes and age ≥80 as mortality risk drivers, and BMI ≥40, ASA ≥3, and operative time likely to exceed 135 minutes as the key levers for complication risk — these specific thresholds, not general obesity or comorbidity, are what the data support.

Preoperative optimization of diabetic control and weight reduction to below BMI 40 are the highest-yield modifiable targets; efficient surgical technique keeping tourniquet-to-close under 135 minutes independently reduces complication risk regardless of patient factors.

Supplemental

Thirty-Day Postoperative Complications and Mortality Following Total Knee Arthroplasty: Incidence and Risk Factors among a National Sample of 15,321 Patients.

Belmont, Schoenfeld, et al.·J Bone Joint Surg Am·2014·433 citations·Hip & Knee

Thirty-Day Postoperative Complications and Mortality Following Total Knee Arthroplasty: Incidence and Risk Factors among a National Sample of 15,321 Patients.

Study Snapshot

Key Findings

Clinical Relevance

Related Articles

Thirty-Day Postoperative Complications and Mortality Following Total Knee Arthroplasty: Incidence and Risk Factors among a National Sample of 15,321 Patients.

Study Snapshot

Key Findings

Clinical Relevance

Related Articles

Thirty-Day Postoperative Complications and Mortality Following Total Knee Arthroplasty: Incidence and Risk Factors among a National Sample of 15,321 Patients.

Study Snapshot

Key Findings

Clinical Relevance

Related Articles

Thirty-Day Postoperative Complications and Mortality Following Total Knee Arthroplasty: Incidence and Risk Factors among a National Sample of 15,321 Patients.

Study Snapshot

Key Findings

Clinical Relevance

Related Articles