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Table 5 Relationship between KOOS 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 KOOS

Postoperative 2-year KOOS

1

185.2 ± 46.6

420.2 ± 42.9

2

182.0 ± 70.4

393.9 ± 67.3

3

192.5 ± 79.1

350.0 ± 79.9*

4

171.7 ± 38.2

317.9 ± 78.3*†

  1. Significant differences in postoperative 2-year KOOS between Ahlbäck grade 1 and grade 3, 4 (* P < 0.01) and between Ahlbäck grade 2 and grade 4 ( P < 0.01) by one-way ANOVA Post-hoc Tukey’s test
  2. KOOS: Knee Injury and Osteoarthritis Outcome Score