Can bedside patient-reported numbness predict postoperative ambulation ability for total knee arthroplasty patients with nerve block catheters?.
10.4097/kjae.2016.69.1.32
- Author:
Seshadri C MUDUMBAI
1
;
Toni GANAWAY
;
T Edward KIM
;
Steven K HOWARD
;
Nicholas J GIORI
;
Cynthia SHUM
;
Edward R MARIANO
Author Information
1. Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University School of Medicine, CA, USA. emariano@stanford.edu
- Publication Type:Original Article
- Keywords:
Adductor canal block;
Ambulation;
Femoral nerve block;
Numbness Perineural catheter;
Total knee arthroplasty
- MeSH:
Arthroplasty*;
Body Mass Index;
Catheters*;
Cohort Studies;
Early Ambulation;
Femoral Nerve;
Humans;
Hypesthesia*;
Knee*;
Linear Models;
Nerve Block*;
Quadriceps Muscle;
Retrospective Studies;
Walking*
- From:Korean Journal of Anesthesiology
2016;69(1):32-36
- CountryRepublic of Korea
- Language:English
-
Abstract:
BACKGROUND: Adductor canal catheters offer advantages over femoral nerve catheters for knee replacement patients because they produce less quadriceps muscle weakness; however, applying adductor canal catheters in bedside clinical practice remains challenging. There is currently no patient-reported outcome that accurately predicts patients' physical function after knee replacement. The present study evaluates the validity of a relatively new patient-reported outcome, i.e., a numbness score obtained using a numeric rating scale, and assesses its predictive value on postoperative ambulation. METHODS: We conducted a retrospective cohort study pooling data from two previously-published clinical trials using identical research methodologies. Both studies recruited patients undergoing knee replacement; one studied adductor canal catheters while the other studied femoral nerve catheters. Our primary outcome was patient-reported numbness scores on postoperative day 1. We also examined postoperative day 1 ambulation distance and its association with postoperative numbness using linear regression, adjusting for age, body mass index, and physical status. RESULTS: Data from 94 subjects were included (femoral subjects, n = 46; adductor canal subjects, n = 48). Adductor canal patients reported decreased numbness (median [10th-90th percentiles]) compared to femoral patients (0 [0-5] vs. 4 [0-10], P = 0.001). Adductor canal patients also ambulated seven times further on postoperative day 1 relative to femoral patients. There was a significant association between postoperative day 1 total ambulation distance and numbness (Beta = -2.6; 95% CI: -4.5, -0.8, P = 0.01) with R2 = 0.1. CONCLUSIONS: Adductor canal catheters facilitate improved early ambulation and produce less patient-reported numbness after knee replacement, but the correlation between these two variables is weak.
