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Table 1 Angles of interest measured on X-rays before and after the Lapidus operation

From: The change of first metatarsal head articular surface position after Lapidus arthrodesis

Angle Preoperatively Postoperatively
HVA 45.6° ± 20.5 (range 25.0° to 77.0°) 24.6° ± 14.4° (range 2.1° to 36.0°)
IMA 16.9° ± 3.8° (range 8.5° to 28.5°) 9.8° ± 5.3° (range − 2.0° to 27.8°)
TASA 3.8° ± 8.5° (range − 17.0° to 26.0°) 9.9° ± 6.9° (range − 5.6° to 30.3°)
PASA 20.5° ± 7.5° (range 3.3° to 40.0°) 19.4° ± 6.9° (range 2.6° to 36.9°)
DASA 1.5° ± 4.0° (range − 9.0° to 20.0°) 3.4° ± 5.2° (range − 13.5° to 15.0°)
  1. HVA – hallux valgus angle, IMA – intermetatarsal angle, TASA – tangential angle to the second axis, DASA – distal articular set angle; values mean ± standard deviation (range)
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