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Table 2 Radiographic measurements of LDFA and ATJL with flexion and rotation error

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

Flexion and rotation error Preoperative LDFA (°) Preop. LDFA diff. to reference (°) Postoperative LDFA (°) Postop. LDFA diff. to reference (°) Preoperative ATJL (mm) ATJL diff. to reference (mm) Postoperative ATJL (mm) Postoperative ATJL diff. to reference (mm)
0° flexion +0° rotation 91.6 (± 0.2)   93.7 (± 0.3)   49.3 (± 0.1)   46.9 (± 0.4)  
0° flexion +5° internal rotation 92.4 (± 0.3) 0.9 (± 0.3) 94.9 (± 0.3) 1.2 (± 0.2) 48.9 (± 0.3) -0.4 (± 0.3) 46.9 (± 0.2) 0.0 (± 0.3)
0° flexion +5° external rotation 90.7 (± 0.3) -0.9 (± 0.3) 92.8 (± 0.3) -0.9 (± 0.1) 49.9 (± 0.9) 0.2 (± 0.2) 47.4 (± 0.1) 0.5 (± 0.4)
5° flexion +0° rotation 91.8 (± 0.2) 0.3 (± 0.2) 93.7 (± 0.1) 0.0 (± 0.2) 49.4 (± 0.3) 0.2 (± 0.4) 47.8 (± 0.1) 0.9 (± 0.3)
5° flexion +5° internal rotation 91.9 (± 0.1) 0.3 (± 0.1) 93.9 (± 0.1) 0.2 (± 0.1) 49.3 (± 0.6) 0.0 (± 0.6) 48.3 (± 0.2) 1.4 (± 0.2)
5° flexion +5° external rotation 91.7 (± 0.7) 0.1 (± 0.5) 93.2 (± 0.2) -0.5 (± 0.1) 49.8 (± 0.6) 0.5 (± 0.6) 48.1 (± 0.1) 1.2 (± 0.4)
10° flexion +0° rotation 92.3 (± 0.2) 0.7 (± 0.1) 93.8 (± 0.3) 0.1 (± 0.1) 49.5 (± 0.5) 0.2 (± 0.6) 49.1 (± 0.2) 2.2 (± 0.2)
10° flexion +5° internal rotation 92.1 (± 0.1) 0.5 (± 0.3) 93.5 (± 0.3) -0.2 (± 0.3) 49.6 (± 0.6) 0.3 (± 0.7) 49.1 (± 0.3) 2.2 (± 0.2)
10° flexion +5° external rotation 92.3 (± 0.4) 0.7 (± 0.2) 93.9 (± 0.2) 0.2 (± 0.4) 49.9 (± 0.7) 0.6 (± 0.7) 49.2 (± 0.3) 2.3 (± 0.1)
  1. LDFA Lateral distal femoral angle, JL Joint line, med. medial, lat. lateral, diff. difference, values given in mean (± standard deviation)
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