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Table 2 Estimated optimal anterior gap and posterior gap ratio to maintain posterior tibial slope using X-ray, and real posterior slope change after high tibial osteotomy

From: Estimation of the proper gap ratio using preoperative radiography for posterior tibial slope maintenance in biplanar open wedge high tibial osteotomy

Estimated PTS change

HTL (mm)

49.3 ± 5.7

TOL (mm)

69.5 ± 7.3

HTL: TOL ratio (optimal AG:PG ratio)

70.9 ± 3.5%

AG (mm)

6.8 ± 1.9

PG (mm)

9.4 ± 2.3

AG:PG ratio

72.9 ± 11.9%

Difference between HTL:TOL ratio and AG:PG ratio

1.9 ± 11.7%

Real parameter changes

 

Preoperative

Postoperative

p-value

MPTA (°)

85.1 ± 2.4

92.2 ± 2.74

 < 0.001

HKA angle (°)

7.5 ± 2.8 (varus)

1.7 ± 2.4 (valgus)

 < 0.001

PTS (°)

10.2 ± 2.8

11.2 ± 3.9

0.006

  1. HKA: hip-knee-ankle, MPTA: medial proximal tibial angle, PTS: posterior tibial slope, AG: anterior gap, PG: posterior gap, HTL: hinge to medial tibial tuberosity length, TOL: total osteotomy length
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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X