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Knee Surgery, Sports Traumatology, Arthroscopy

, Volume 22, Issue 8, pp 1799–1804 | Cite as

No influence of coronal laxity and alignment on lift-off after well-balanced and aligned total knee arthroplasty

  • Satoshi HamaiEmail author
  • Hiromasa Miura
  • Ken Okazaki
  • Takeshi Shimoto
  • Hidehiko Higaki
  • Yukihide Iwamoto
Knee

Abstract

Purpose

In vivo fluoroscopic analyses have revealed the kinematics after total knee arthroplasty (TKA), including femoral condylar lift-off. This study asked whether differences in static varus–valgus laxity or coronal limb alignment after TKA affect lift-off under weight-bearing conditions. It was hypothesised that there is a correlation between coronal laxity or alignment and lift-off during walking.

Methods

The current study analysed nineteen subjects undergoing cruciate-retaining TKA performed by the measured resection technique. The varus–valgus laxity at knee extension was measured using a 150 N stress radiograph. The mechanical axis was measured using a full-standing radiograph. Continuous radiological images were taken while the subject walked on a treadmill, and the images during single-leg stance were analysed to determine the lift-off using a 3D-to-2D image-to-model registration technique.

Results

The average angle in varus/valgus stress was 6.8 ± 1.8°/6.6 ± 2.1°. No statistically significant differences were observed between the varus and valgus laxity. The average amount of lift-off was 0.7 ± 0.4 mm. The static varus–valgus laxity (n. s.) or the differences in the laxities (n. s.) on the stress radiograph did not influence lift-off. The weight-bearing ratio was achieved within the middle third of the knee in 90 % of subjects. Two outliers with valgus alignment (68 ± 1 %) demonstrated no significant difference in lift-off in comparison with the majority of the subjects (46 ± 9 %).

Conclusion

The static coronal laxity and alignment did not influence the lift-off under dynamic weight-bearing conditions after well-balanced and aligned cruciate-retaining TKA. Measured resection technique can produce sufficient coronal stability and alignment without significant lift-off during walking.

Level of evidence

IV.

Keywords

Laxity Alignment Lift-off Walking Total knee arthroplasty Measured resection 

Notes

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Satoshi Hamai
    • 1
    Email author
  • Hiromasa Miura
    • 2
  • Ken Okazaki
    • 1
  • Takeshi Shimoto
    • 3
  • Hidehiko Higaki
    • 4
  • Yukihide Iwamoto
    • 1
  1. 1.Department of Orthopaedic Surgery, Faculty of Medical SciencesKyushu UniversityHigashi-ku, FukuokaJapan
  2. 2.Department of Orthopaedic Surgery, Graduate School of MedicineEhime UniversityToon, EhimeJapan
  3. 3.Department of Information and Systems Engineering, Faculty of Information EngineeringFukuoka Institute of TechnologyHigashi-ku, FukuokaJapan
  4. 4.Department of Mechanical Engineering, Faculty of EngineeringKyushu Sangyo UniversityHigashi-ku, FukuokaJapan

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