Table 3 Body compositions measured using whole-body dual X-ray absorptiometry according to automatic metal detection processing and application of substitution protocol among 10 study participants who underwent unilateral total knee replacement only.

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

 

Without AMD processing

With AMD processing

Substitution protocol applied

p-value

Whole body

 Total BMC (g)

1769.3 ± 371.0

1649.7 ± 379.0a

1697.9 ± 393.0a, b

 < 0.001

 Total FM (g)

23,083.4 ± 8350.0

22,559.5 ± 8199.0a

22,768.4 ± 8291.0

0.001

 Total LM (g)

35,936.4 ± 4682.0

35,618.8 ± 4950.0

35,654.0 ± 4649.0a

0.008

Segmental body

 Leg that underwent TKR surgery, FM (g)

3556.0 ± 1521.0

3036.8 ± 1377.0a

3213.1 ± 1441.0a

0.001

 Leg that underwent TKR surgery, LM (g)

5699.3 ± 1066.0

5185.4 ± 936.0a

5416.9 ± 1015.0a, b

0.045

 Leg that underwent TKR surgery, BMC (g)

377.3 ± 64.0

260.1 ± 73.0a

305.9 ± 82.0a, b

 < 0.001

SMI (kg/m2)

6.31 ± 0.71

6.10 ± 0.69a

6.19 ± 0.69a,b

 < 0.001

  1. Substitution protocol: substituting the LM of the leg that underwent TKR with that of the leg that did not undergo TKR.
  2. AMD automatic metal detection, BMC bone mineral content, FM fat mass, LM lean mass, TKR total knee replacement, SMI skeletal muscle mass index.
  3. aStatistically significant difference between results without and with AMD processing and between results with AMD processing and substitution protocol application.
  4. bStatistically significant difference between results with AMD processing and substitution protocol application.
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