Document Detail


Bariatric orthopaedics: total knee arthroplasty in super-obese patients (BMI > 50 kg/m2). Survivorship and complications.
MedLine Citation:
PMID:  23839328     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Some studies have suggested that patients who are super obese (BMI > 50 kg/m(2)) may have poorer outcomes and more frequent complications when undergoing TKA compared with those who have lower BMI, however, the literature on this is scant.
QUESTIONS/PURPOSES: The purpose of this study was to compare a group of super-obese patients undergoing TKA with a matched group of patients with BMI less than 30 kg/m(2) in terms of (1) implant survivorship, (2) complications, (3) functional parameters, and (4) intraoperative variables (including operative time and estimated blood loss).
METHODS: One-hundred one knees in 95 patients (21 men, 74 women) who had a minimum BMI of 50 kg/m(2) and who had undergone a primary TKA at one of the four high-volume institutions were compared with a group of patients who had a BMI less than 30 kg/m(2) who were matched by age, gender, preoperative clinical scores, and mean followup. End points evaluated by chart review included implant survivorship, medical and surgical complications, functional parameters (The Knee Society outcome scores and ROM), and intraoperative variables at a mean followup of 62 months (range, 36-85 months).
RESULTS: With the numbers available, there were no differences in aseptic implant survivorship (94% versus 98%, p = 0.28), however, medical and surgical complication rates (14% versus 5%, OR: 3.1, 95% CI=1.07-8.9; p = 0.037) were significantly higher in the super-obese patients compared with the nonobese matching group, respectively. Super-obese patients also achieved lower mean Knee Society functional scores (82 versus 90 points, p = 0.004) and smaller gains in flexion arc ROM (14° versus 21°, p = 0.009); they also lost more blood during surgery and experienced longer surgical anesthesia times compared with the matched group, respectively.
CONCLUSIONS: With the numbers available, we could not identify what might have been modest differences in implant survivorship, however, complications were more frequent and functional outcomes were significantly lower in super-obese patients. Other studies similarly have found inferior outcomes in this challenging group of patients. Our data may be considered pilot data for future prospective studies with longer followup.
Authors:
Qais Naziri; Kimona Issa; Arthur L Malkani; Peter M Bonutti; Steven F Harwin; Michael A Mont
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Publication Detail:
Type:  Journal Article; Multicenter Study     Date:  2013-07-10
Journal Detail:
Title:  Clinical orthopaedics and related research     Volume:  471     ISSN:  1528-1132     ISO Abbreviation:  Clin. Orthop. Relat. Res.     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2013-10-08     Completed Date:  2013-12-17     Revised Date:  2014-11-04    
Medline Journal Info:
Nlm Unique ID:  0075674     Medline TA:  Clin Orthop Relat Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3523-30     Citation Subset:  AIM; IM    
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Arthroplasty, Replacement, Knee* / adverse effects,  instrumentation
Body Mass Index*
Case-Control Studies
Female
Hospitals, High-Volume
Humans
Knee Prosthesis
Male
Middle Aged
Obesity, Morbid / complications*,  diagnosis
Odds Ratio
Postoperative Complications / etiology
Prosthesis Design
Prosthesis Failure
Risk Factors
Time Factors
Treatment Outcome
United States
Comments/Corrections
Comment In:
Clin Orthop Relat Res. 2013 Nov;471(11):3531-2   [PMID:  23928710 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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