title: Relationship between Bone Mineral Density and Spinal Muscle Area in Magnetic Resonance Imaging.
abstract: BACKGROUND
  Bone mineral density (BMD) is known to have a positive correlation with lean body mass. Several studies have also reported the positive correlation between muscle power and BMD. From this point of view, we hypothesized BMD of lumbar spine to have a positive correlation with muscle mass.
  
  
  METHODS
  Seventy-nine female patients aged between 60 and 75 years old and who underwent magnetic resonance imaging (MRI) and BMD studies were included. Muscle mass in spine MRI was defined by the sum of the average muscle area of three axial images for each disc level. Lumbosacral muscle is the sum of paraspinal muscle and psoas muscle.
  
  
  RESULTS
  In correlation analysis, paraspinal muscle mass showed positive correlation with BMD of lumbar spine. Lumbosacral muscle mass showed positive correlation with BMD of trochanteric area of the femur. However, BMD of other area showed no significant correlation with muscle mass.
  
  
  CONCLUSIONS
  Therefore, postmenopausal women older than 60 years with a well developed spine muscle mass, have a high BMD.
authors.affiliation: Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Dae-Young
authors.initials: DY
authors.lastname: Lee
authors.affiliation: Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Jae-Ho
authors.initials: JH
authors.lastname: Yang
authors.affiliation: Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Chul-Hyun
authors.initials: CH
authors.lastname: Ki
authors.affiliation: Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Min-Seok
authors.initials: MS
authors.lastname: Ko
authors.affiliation: Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Kyung-Soo
authors.initials: KS
authors.lastname: Suk
authors.affiliation: Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Hak-Sun
authors.initials: HS
authors.lastname: Kim
authors.affiliation: Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Hwan-Mo
authors.initials: HM
authors.lastname: Lee
authors.affiliation: Department of Orthopaedic Surgery, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Seong-Hwan
authors.initials: SH
authors.lastname: Moon
keywords: Bone mineral density; Muscle; Osteoporosis; Postmenopause; Skeletal