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KMID : 0361620140490010043
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Journal of the Korean Orthopaedic Association
2014 Volume.49 No. 1 p.43 ~ p.49
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Correlation between Femoral Tunnel Location in Three-Dimensional Computed Tomography and Femoral Tunnel Angle in Plain Radiographs after Single-Bundle Anterior Cruciate Reconstruction
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Lee Ju-Hong
Park Hyuk
Jeong Seong-Yup
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Abstract
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Purpose: The purpose of this study is to determine correlation between femoral tunnel angle in the coronal plane on a simple radiograph and femoral tunnel location in the sagittal plane on three-dimensional computed tomography (3D-CT).
Materials and Methods: The subjects included 42 patients who underwent 3D-CT after the operation out of 70 cases of anterior cruciate ligament reconstruction using quadriceps tendon-patelllar bone autograft from April, 2009 to June, 2011. Measurement of the femoral tunnel angle was based on the anatomical axis of the femur in antero-posterior (AP) and Rosenberg views; femoral tunnel location was described as a proportional percentage on the medial surface of the lateral femoral condyle in the 3D-CT image; then the correlation between femoral tunnel angle and femoral tunnel location was analyzed retrospectively.
Results: Femoral tunnel angle was 41.5°±6.8° (range: 29.7°-53.9°) on AP radiographs, and 34.9°±6.9° (range: 23.8°-46.5°) on Rosenberg views. The femoral tunnel was located 36.9%±11.3% from posterior, and 38.1%±6.5% from proximal on the 3D-CT image. On plain AP radiographs, femoral tunnel angle and femoral tunnel location showed negative correlation (p<0.001, rho=-0.498), and, in comparison with Rosenberg view, they showed negative correlation (p=0.006, rho=-0.416). Twenty three patients (53.5%) had femoral tunnel in the anatomical location. Their femoral tunnel angle on AP radiographs was 43.3°±6.1°, while the femoral tunnel angle of patients who had femoral tunnel in non-anatomical locations was 38.4°±6.4° (p=0.004). In the Rosenberg picture, similar difference was observed between the two groups (p=0.012).
Conclusion: On AP radiographs and Rosenberg views, femoral tunnel angle showed significant correlation with the femoral tunnel location on the 3D-CT image, and the group who had femoral tunnel location in the anatomical range showed a relatively higher femoral tunnel angle.
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KEYWORD
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anterior cruciate ligament reconstruction, femoral tunnel angle, femoral tunnel location, three-dimensional computed tomography
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