Korean J Fam Pract. 2018; 8(6): 890-895  https://doi.org/10.21215/kjfp. 2018.8.6.890
Effects of Knee Osteoarthritis on Lower Extremity Sarcopenia and Quality of Life in Korean Elderly
Jeong Hwa Heo1, Jeong Jae Moon2,*, Seung Min Ryu2, Noh Cheol Park1, Moon Young Kang1
1Department of Family Medicine, Keimyung University Dongsan Hospital; 2Department of Orthopedic Surgery, Yeungnam University Hospital, Daegu, Korea
Jeong Jae Moon
Tel: +82-53-620-3640, Fax: +82-53-628-4020
E-mail: dreamjj21c@naver.com
ORCID: http://orcid.org/0000-0002-4837-8753
Received: December 4, 2017; Revised: June 22, 2018; Accepted: August 6, 2018; Published online: December 20, 2018.
© The Korean Academy of Family Medicine. All rights reserved.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Background: Diagnosis of sarcopenia using lower extremity skeletal muscle mass may be useful. This study investigated the relationship between knee osteoarthritis and the prevalence of sarcopenia using lower limb skeletal muscle mass, and the relationship between sarcopenia symptoms and quality of life in knee osteoarthritis.
Methods: We used the 5th Korea National Health and Nutrition Examination Survey data, 2010. The data for 927 Koreans aged ≥65 years were crosssectionally analyzed. Sarcopenia was diagnosed by calculating the lower skeletal muscle index from muscle mass measured using dual energy X-ray absorptiometry. Knee osteoarthritis, clinical symptoms (pain & stiffness), and quality of life were evaluated.
Results: Based on lower extremity skeletal muscle mass, the prevalence of sarcopenia was 9.9% in patients with radiographic knee osteoarthritis, and 9.3% in patients without osteoarthritis. Diagnosis of sarcopenia based on lower extremity skeletal muscle mass showed a significant correlation with clinical symptoms of osteoarthritis and quality of life.
Conclusion: There was no correlation between the presence of knee osteoarthritis and the prevalence of sarcopenia. However, the diagnosis of sarcopenia based on lower extremity skeletal muscle mass is valuable for determining treatment of knee pain and improving quality of life.
Keywords: Sarcopenia; Osteoarthritis; Lower Extremity Skeletal Muscle Mass Index; Quality of Life


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