Table 2 Body compositions of the study participants measured using whole-body dual X-ray absorptiometry with and without automatic metal detection processing (n = 24).

From: Effect of total knee replacement on skeletal muscle mass measurements using dual energy X-ray absorptiometry

Variables

Without AMD processing

With AMD processing

p-value

Whole body

 BMC (g)

1764 ± 70

1553 ± 71

 < 0.001

 Total FM (g)

23,226 ± 6980

22,430 ± 6850

 < 0.001

 Total LM (g)

36,953 ± 4612

36,259 ± 4570

 < 0.001

Segmental body

 Right leg FM (g)a

3647.4 ± 283.8

3139.1 ± 261.5

 < 0.001

 Left leg FM (g)b

3454.1 ± 321.9

2740.0 ± 216.9

 < 0.001

 Right leg LM (g)a

6017.1 ± 199.3

5493.7 ± 171.3

 < 0.001

 Left leg LM (g)b

5657.1 ± 220.1

5173.7 ± 201.8

 < 0.001

 Right leg BMC (g)a

401.3 ± 15.9

263.4 ± 14.1

 < 0.001

 Left leg BMC (g)b

377.3 ± 16.5

249.9 ± 12.1

 < 0.001

SMI (kg/m2)

6.5 ± 0.6

6.1 ± 0.6

 < 0.001

  1. Values are presented as means ± standard deviations.
  2. AMD automatic metal detection, BMC bone mineral content, FM fat mass, LM lean mass, SMI skeletal muscle mass index.
  3. Out of the 24 participants who underwent total knee replacement (TKR) surgery, six underwent right-knee TKR surgery, four underwent left-knee TKR surgery, and 14 underwent TKR surgery in both knees.
  4. aThe number of participants who underwent right-knee TKR surgery was 20.
  5. bThe number of participants who underwent left-knee TKR surgery was 18.
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