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Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy

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Improved intra-operative reduction control using a three-dimensional mobile image intensifier - a proximal tibia

T Gösling¹, K Klingler, J Geerling

¹FRACS, Trauma Department, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany. goesling.thomas@mh-hannover.de

|October 24, 2008

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The three-dimensional mobile image intensifier (ISO-C 3D) offers higher precision than conventional fluoroscopy for assessing tibial plateau fractures. High-resolution CT scans remain the gold standard for post-operative evaluation.

Area of Science:

Orthopedic Surgery
Medical Imaging
Biomechanics

Background:

Accurate assessment of fracture reduction is crucial for optimal patient outcomes.
Conventional fluoroscopy and advanced imaging techniques are used for intraoperative and postoperative evaluation.
The precision of three-dimensional mobile image intensifiers (ISO-C 3D) in fracture reduction assessment requires further investigation.

Purpose of the Study:

To compare the precision of ISO-C 3D with conventional 2D fluoroscopy and high-resolution CT scans.
To evaluate the impact of different ISO-C 3D imaging protocols on precision.
To determine the optimal imaging modality for assessing tibial plateau fracture reduction.

Main Methods:

A depression fracture model (AO/OTA 41-B2.3) was created in 12 human cadaver knees.

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Imaging was performed using conventional fluoroscopy, high-resolution CT, and ISO-C 3D with four protocols (100, 66, 50, 33 images).

Three independent observers assessed the difference between estimated and real reduction for statistical analysis.

Main Results:

Conventional fluoroscopy showed significantly higher deviations (0.7 mm) than CT (0.3 mm) and all ISO-C 3D groups (0.4-0.5 mm).
ISO-C 3D demonstrated higher precision compared to fluoroscopy (p<0.001).
The ISO-C 3D protocol with the fewest images showed slightly lower precision than CT (p<0.001).

Conclusions:

The three-dimensional mobile image intensifier (ISO-C 3D) provides superior precision for reduction assessment in tibial plateau fractures compared to fluoroscopy.
High-resolution CT scans are recommended as the standard for postoperative assessment of reduction outside the operating room.
ISO-C 3D shows promise as an intraoperative tool, but CT remains essential for definitive postoperative evaluation.