Clinical Orthopaedics and Related Research®

, Volume 471, Issue 5, pp 1458–1464

Distal Femur Rotation Relates to Joint Obliquity in ACL-deficient Chinese

Authors

    • Department of Orthopaedics and TraumatologyThe University of Hong Kong, Queen Mary Hospital
  • K. Y. Chiu
    • Department of Orthopaedics and TraumatologyThe University of Hong Kong, Queen Mary Hospital
  • August W. M. Fok
    • Department of Orthopaedics and TraumatologyQueen Mary Hospital
  • C. H. Yan
    • Department of Orthopaedics and TraumatologyThe University of Hong Kong, Queen Mary Hospital
  • F. Y. Ng
    • Department of Orthopaedics and TraumatologyQueen Mary Hospital
Symposium: Special Considerations for TKA in Asian Patients

DOI: 10.1007/s11999-012-2698-4

Cite this article as:
Yau, W.P., Chiu, K.Y., Fok, A.W.M. et al. Clin Orthop Relat Res (2013) 471: 1458. doi:10.1007/s11999-012-2698-4

Abstract

Background

The lower limb osteometry of Chinese differs from that of whites. The joint line of the knee in the coronal plane in Chinese is more medially inclined and the posterior condylar angle of the distal femur in the axial plane is larger. However, it is unclear whether there is any direct association between the coronal plane and axial plane osteometry.

Questions/purposes

We asked whether the joint line obliquity of the knee is related to the posterior condylar angle of the distal femur in young Chinese subjects.

Methods

Ninety-nine young Chinese patients with anterior cruciate ligament injuries were recruited. The lower limb alignment and joint line obliquity were measured using standing long radiographs of the whole lower limb. The rotational alignment of the distal femur was assessed in the axial cuts of the MRI.

Results

The distal femur rotational alignment was associated with the obliquity of the knee in Chinese. The posterior condylar angle was 5° ± 2°. The knee was 5° ± 3° medially inclined.

Conclusions

The joint line of the knee in a group of young Chinese patients was more medially inclined than that of whites. The posterior condylar angle of the distal femur was larger. The presence of an association between distal femur rotational alignment and joint line obliquity in this group of young Chinese patients suggests a possible developmental cause explaining the difference in osteometry between races.

Copyright information

© The Association of Bone and Joint Surgeons® 2012