01-08-2018 | Knee
Is the contralateral tibia a reliable template for reconstruction: a three-dimensional anatomy cadaveric study
Published in: Knee Surgery, Sports Traumatology, Arthroscopy | Issue 8/2018
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Purpose
The contralateral anatomy is regularly used as a reconstruction template for corrective osteotomies of several deformities and pathological conditions. However, there is lack of evidence that the intra-individual differences between both tibiae are sufficiently small to use the contralateral tibia as a 3D reconstruction template for complex osteotomies. The aim of this study was to evaluate the intra-individual side differences of the tibia in length, torsion, angulation, and translation using 3D measurement techniques.
Methods
3D surface models of both tibiae were created from computed tomography data of 51 cadavers. The (mirrored) models of the right tibiae were divided into two halves at the centre of the shaft. Thereafter, the proximal and distal segments were aligned to the left (contralateral) tibia in an automated fashion. The relative 3D transformation between both aligned segments was measured to quantify the side difference in 6° of freedom (3D translation vector, 3 angles of rotation).
Results
The mean side difference in tibia length was 2.1 mm (SD 1.3 mm; range 0.2–5.9 mm). The mean side difference in torsion was 4.9° (SD 4.1°; range 0.2°–17.6°). The mean side difference in the coronal and sagittal planes was 1.1° (SD 0.9°; range 0.0°–4.6°) and 1.0° (SD 0.8°; range 0.1°–2.9°), respectively.
Conclusion
The present study confirms small side differences in torsion between the left and right tibia, while the side differences in the coronal and sagittal plane are probably negligible. The contralateral tibia seems to be a reliable reconstruction template for the 3D preoperative planning of complex corrective osteotomies of the tibia. However, torsional differences should be interpreted with caution, as a single cut-off value of a clinically relevant torsional side difference cannot be defined. The presented results are relevant to surgeons considering the contralateral tibia as a 3D reconstruction template for corrective osteotomies of the tibia.
Level of evidence
Basic science.