Prospective Study of Central versus Peripheral Obesity in Total Knee Arthroplasty

• Published in: Knee Surgery and Related Research, 30(4) Vol. 30; no. 4; pp. 319 - 325
• Main Authors: Armstrong, John G, Morris, Tyler R, Sebro, Ronnie, Israelite, Craig L, Kamath, Atul F
• Format: Journal Article
• Language: English
• Published: England Korean Knee Society 01.12.2018; 대한슬관절학회
• Subjects: Original; 정형외과학; Knee; Obesity; Arthroplasty; Anthropometry
• ISSN: 2234-0726; 1225-1623; 2234-2451
• DOI: 10.5792/ksrr.18.025

Body mass index (BMI) is often used to predict surgical difficulty in patients receiving total knee arthroplasty (TKA); however, BMI neglects variation in the central versus peripheral distribution of adipose tissue. We sought to examine whether anthropometric factors, rather than BMI alone, may serve as a more effective indication of surgical difficulty in TKA. We prospectively enrolled 67 patients undergoing primary TKA. Correlation coefficients were used to evaluate the associations of tourniquet time, a surrogate of surgical difficulty, with BMI, pre- and intraoperative anthropometric measurements, and radiographic knee alignment. Similarly, Knee Injury and Osteoarthritis Outcome Score (KOOS) was compared to BMI. Tourniquet time was significantly associated with preoperative inferior knee circumference (p=0.025) and ankle circumference (p=0.003) as well as the intraoperative depth of incision at the quadriceps (p=0.014). BMI was not significantly associated with tourniquet time or any of the radiographic parameters or KOOS scores. Inferior knee circumference, ankle circumference, and depth of incision at the quadriceps (measures of peripheral obesity) are likely better predictors of surgical difficulty than BMI. Further study of alternative surgical indicators should investigate patients that may be deterred from TKA for high BMI, despite relatively low peripheral obesity.