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Table 1 Comparison of radiographic parameters between the group with a JLCA change < 2° (group I) and the group with a JLCA decrease ≥ 2° (group II)

From: Change of joint-line convergence angle should be considered for accurate alignment correction in high tibial osteotomy

  JLCA change < 2°
(N = 64)
JLCA decrease ≥ 2°
(N = 16)
P value
Preoperative mFTA − 4.7° ± 2.6° − 9.1° ± 3.8° < 0.001
Postoperative mFTA 3.4° ± 2.6° 2.6° ± 3.0° 0.301
Preoperative JLCA (standing) 2.1° ± 1.1° 4.9° ± 1.1° < 0.001
Postoperative JLCA (standing) 1.7° ± 1.1° 2.1° ± 1.1° 0.262
Preoperative JLCA (supine) 1.4° ± 1.0° 2.1° ± 1.2° 0.042
Postoperative JLCA (supine) 1.5° ± 1.1° 1.7° ± 1.2° 0.530
Preoperative differences of JLCA on standing and when supine 0.7° ± 0.7° 2.8° ± 1.0° < 0.001
Postoperative differences of JLCA on standing and when supine 0.2° ± 0.9° 0.3° ± 0.8° 0.563
Preoperative mMPTA 85.7° ± 1.9° 84.7° ± 1.7° 0.061
Postoperative mMPTA 93.2° ± 2.8° 94.5° ± 2.7 0.088
Preoperative mLDFA 88.2° ± 1.7° 89.0° ± 2.7° 0.314
Preoperative TPS 10.0° ± 2.9° 10.9° ± 3.5° 0.261
Postoperative TPS 10.5° ± 3.1° 11.8° ± 3.8° 0.179
Postoperative outlier (mFTA < 0° or > 6°) 14 (22%) 5 (31%) 0.514
Postoperative outlier (WBL < 50% or > 70%) 24 (38%) 9 (56%) 0.173
  1. JLCA joint-line convergence angle, mFTA mechanical femorotibial angle, mPTA mechanical proximal tibial angle, mLDFA mechanical lateral distal femoral angle, TPS tibial posterior slope, WBL weight-bearing line