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Table 1 Comparison of radiographic and 3D-surface scan measurements: JL difference pre- to postoperative

From: 3D-surface scan based validated new measurement technique of femoral joint line reconstruction in total knee arthroplasty

  Mean SD Median Max Min
Radiographic analysisa
 Medial JL difference (mm) -2.2  ± 0.1 -2.2 -2.0 -2.3
 Lateral JL difference (mm) -0.4  ± 0.3 -0.6 0.5 -0.6
3D Structured Light Scanner analysis
 Medial JL difference (mm) -1.3  ± 0.1 -1.2 -1.2 -1.4
 Lateral JL difference (mm) 0.2  ± 0.1 0.2 0.3 0.1
Difference in between techniques
Medial JL difference (mm) -0.9   -1.0   
Lateral JL difference (mm) -0.6   -0.8   
  1. LDFA Lateral distal femoral angle, JL Joint line, SD standard deviation, Max Maximum, Min Minimum, a0° Flexion without rotation error (reference measurement), negative sign expresses ‘proximalisation’
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