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					A new predictive index for
back muscle degeneration
  associated with aging

Kazushi Takayama, *T. Kita, *F. Kanematsu,
*T. Yasunami, H. Sakanaka, Y. Yamano
Dept. of Orthopaedic Surgery, Seikeikai Hospital,
*Saiseikai Nakatsu Hospital, Osaka, Japan

                           20 Oct. 2011 EuroSpine 2011
                  Introduction




Lumbar lordosis




Lumbar
paraspinal
muscles
                           T-back value



               ≒

     Check !

1. To evaluate the paraspinal muscle degeneration
    associated with aging
2. To determine the correlation between the T-back
    value and paraspinal muscle degeneration
                Subjects

160 patients by 10 subjects of men and women
in each decade aged 10 to 80 years of age
Lumbar lordosis ≧ 20°
Without considering the degree of LBP
 Exclusion
   Spondylolisthesis ≧ I°
   Scoliosis ≧ 10°
   History of lumbar surgery
                   Methods
Body mass index
Axial T2-weighted MRI
 ( at the intervertebral disc level from L1-L5 )
  Cross-sectional area of the paraspinal muscle
  Fat infiltration of the paraspinal muscle
  T-back value
Results
 Body mass index (kg/m2)                          Lordosis (°)

30
                  N.S.                 50
                                                        N.S.

                                       40

20
                                       30


                                       20
10

                                       10


0                                      0
     10s 20s 30s 40s 50s 60s 70s 80s        10s 20s 30s 40s 50s 60s 70s 80s
3500
       Cross-sectional area (CSA)                (cm2)
3000                                              L1/2
                                                  L2/3
2500                                              L3/4
                                                  L4/5

2000

1500

1000

 500

   0
       10s   20s   30s   40s   50s   60s   70s    80s
50
                  Fat infiltration    (%)

40

           L1/2
           L2/3
30         L3/4
           L4/5

20



10



 0
     10s    20s     30s   40s   50s   60s   70s   80s
16
                 T-back value       (mm)
                                                 L1/2
                                                 L2/3
12                                               L3/4
                                                 L4/5


8



4



0
     10s   20s    30s   40s   50s   60s    70s   80s
       Pearson’s correlation coefficient

       CSA × Fat infiltration   CSA × T-back value

             r         p            r          p

L1/2      - 0.474    < 0.01       0.709     < 0.01
L2/3      - 0.482    < 0.01       0.737     < 0.01
L3/4      - 0.55     < 0.01       0.789     < 0.01
L4/5      - 0.634    < 0.01       0.749     < 0.01

       Nagative correlation     Strongly correlation
                    Conclusion

 Our new index, the T-back value, is a
  simple and practical means of
  evaluating back muscle degeneration
  associated with aging.


       Authors Disclosure Information
None of the authors has any potential conflict of interest.

				
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posted:12/4/2011
language:English
pages:12