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Morphological classification of the femoral trochlear groove based on a quantitative measurement of computed tomographic models

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Abstract

Purpose

This study aimed to investigate the natural morphology of the femoral trochlear groove based on quantitative measurement.

Methods

Computed tomographic femur models of 50 male and 50 female healthy Chinese adults (30–60 years) were analysed using three-dimensional software. Coaxial cutting planes (15° increments) rotating about the trochlear groove axis from the proximal to distal point were created, followed by the deepest point of the trochlear groove marked at each cross section. The shape, position, and orientation of the trochlear groove were analysed.

Results

The trochlear groove was located laterally relative to the mechanical axis and consisted of the laterally oriented proximal part and medially oriented distal part. Based on the turning points located on different cross sections, the trochlear groove was classified into four types: types 45°, 60°, 75°, and 90°. The mediolateral position relative to the mechanical axis was types 45°, 60°, 75°, and 90°, from the lateral to medial side, while the distal parts of them extended along the same path. The orientation of the trochlear groove was relatively consistent and smooth, which oriented at approximately 1° medially between two adjacent segments, except at approximately 10° medially at the turning point.

Conclusion

The trochlear groove tracking varies greatly amongst a population that is mainly categorized into four types. This study may be helpful for better understanding of the natural trochlear groove anatomy, prosthetic design modification, and provide the reference value for studying patellofemoral diseases such as patellar maltracking and trochlear dysplasia.

Level of evidence

Prospective study, Level II.

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (Grant No. 81272037).

Author information

Correspondence to You Wang.

Additional information

Shichang Chen and Zhe Du are joint first author and contributed by equal contribution.

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Chen, S., Du, Z., Yan, M. et al. Morphological classification of the femoral trochlear groove based on a quantitative measurement of computed tomographic models. Knee Surg Sports Traumatol Arthrosc 25, 3163–3170 (2017). https://doi.org/10.1007/s00167-016-4236-5

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Keywords

  • Total knee arthroplasty
  • Femoral trochlear groove
  • Morphological analysis
  • Computed tomography
  • Chinese population