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Journal of Experimental Orthopaedics

Table 3 Relationships between preoperative knee parameters and Ahlbäck grade

From: Preoperative Ahlbäck radiographic classification grade significantly influences clinical outcomes of double level osteotomy for osteoarthritic knees with severe varus deformity

Ahlbäck grade

Preoperative mLDFA ( °)

Preoperative mMPTA ( °)

Preoperative mFTA ( °)

Preoperative JLCA ( °)

1

90.9 ± 1.3

81.7 ± 1.8

11.0 ± 1.8 varus

2.1 ± 1.6

2

90.8 ± 1.8

81.8 ± 2.4

12.8 ± 2.7 varus

4.0 ± 1.7 †

3

90.5 ± 2.1

82.4 ± 2.0

14.7 ± 2.6 varus *

6.9 ± 1.7 †

4

89.5 ± 0.4

82.7 ± 0.5

16.2 ± 1.5 varus *

9.3 ± 1.4 †

  1. Significant differences in mTFA between grade 1 and grade 3, 4 knees by one-way ANOVA with Turkey’s post hoc test (*P < 0.01)
  2. Significant differences in JLCA between grade 1 and grade 2, 3, 4 knees by one-way ANOVA with Turkey’s post hoc test (†P < 0.01)
  3. mLDFA: mechanical lateral distal femoral angle
  4. mMPTA: mechanical medial proximal angle
  5. mTFA: mechanical tibio-femoral angle
  6. JLCA: joint-line convergence angle
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