Does patella position influence ligament balancing in total knee arthroplasty?

Purpose In vivo comparative gap measurements were performed in three different patella positions (reduced, subluxated and everted) using offset-type-force-controlled-spreader-system. Methods Prospectively, 50 knees were operated by total knee arthroplasty using a navigation-assisted gap-balancing te...

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Bibliographic Details
Published in:Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA sports traumatology, arthroscopy : official journal of the ESSKA, 2015-07, Vol.23 (7), p.2012-2018
Main Authors: Yoon, Jung-Ro, Oh, Kwang-Jun, Wang, Joon Ho, Yang, Jae-Hyuk
Format: Article
Language:English
Subjects:
Aged
Arthritis
Arthroplasty, Replacement, Knee - methods
Body Weights and Measures
Bone surgery
Female
Genu Varum - surgery
Humans
Joint replacement surgery
Knee
Knee Joint - surgery
Ligaments
Male
Males
Medicine
Medicine & Public Health
Navigation systems
Orthopedics
Osteoarthritis, Knee - surgery
Patella - surgery
Patellar Ligament - surgery
Range of Motion, Articular
Surgeons
Surgery, Computer-Assisted
Transplants & implants
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Summary:Purpose In vivo comparative gap measurements were performed in three different patella positions (reduced, subluxated and everted) using offset-type-force-controlled-spreader-system. Methods Prospectively, 50 knees were operated by total knee arthroplasty using a navigation-assisted gap-balancing technique. The offset-type-force-controlled-spreader-system was used for gap measurements. This commercially available instrument allows controllable tension in patella-reduced position. The mediolateral gaps of knee extension (0°) and flexion (90°) angle were recorded in three different patella positions; reduced, subluxated and everted. Any gap differences of more than 3 mm were considered as a meaningful difference. Correlation between the difference with the demographic data, preoperative radiologic alignment and intraoperative data was analysed. For statistical analysis, ANOVA and Pearson’s correlation test were used. Results The gaps in patella eversion demonstrated smaller gaps both in knee extension and flexion position compared to the gaps of patella reduction position. The amount of decreased gaps was more definite in knee flexion position. Statistically significant difference was observed for the lateral gap of patella eversion compared to gap of patella reduction in knee flexion position ( p  
ISSN:0942-2056
1433-7347
DOI:10.1007/s00167-014-2879-7