A Comparison of the Functional Results of High-Flex Total Knee Arthroplasty - LPS-Flex vs. Scorpio-Flex TKA -

Young-Joon Song; Chul-Won Ha

doi:10.4055/jkoa.2009.44.2.180

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Song and Ha: A Comparison of the Functional Results of High-Flex Total Knee Arthroplasty - LPS-Flex vs. Scorpio-Flex TKA -

Original Article

Journal of the Korean Orthopaedic Association

Journal of the Korean Orthopaedic Association 2009; 44(2): 180-185.

Published online: 30 April 2009

DOI: https://doi.org/10.4055/jkoa.2009.44.2.180

A Comparison of the Functional Results of High-Flex Total Knee Arthroplasty - LPS-Flex vs. Scorpio-Flex TKA -

Young-Joon Song, M.D., Chul-Won Ha, M.D.

Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.

Address reprint requests to Chul-Won Ha, M.D. Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50, Irwon-dong, Kangnam-gu, Seoul 135-710, Korea. Tel: +82.2-3410-0275, Fax: +82.2-3410-0061, hacw@skku.edu

Abstract

Purpose

This study compared the clinical and functional results of LPS-Flex with those of Scorpio-Flex TKA.

Materials and Methods

Fifty cases of High-Flex TKA (24 LPS-Flex and 26 Scorpio-Flex) were analyzed retrospectively. All the procedures were performed during the same period by the senior author and the patients were followed-up for more than 5 years. A functional evaluation was performed by a questionnaire on the high flexion-related activities, including cross-leg sitting, squatting, standing from the floor, standing from a chair and ascending and descending stairs. Each function was classified by the patients into five grades. The clinical evaluation included the range of motion, the Knee Society Knee Score and Function Score (KSKS & KSFS), the WOMAC score and the patient's satisfaction score.

Results

The functional evaluation showed a better result in the LPS-Flex group for the cross-leg sitting function (p=0.039) but there was no difference in the other functions. The clinical evaluation showed more flexion in the LPS-Flex group than that in the Scorpio-Flex group (p=0.044) but there were no difference in the KSKS, KSFS, WOMAC score and the patient's satisfaction score.

Conclusion

LPS-Flex TKA showed better functional results for cross-leg sitting than did Scorpio-Flex TKA. This difference was attributed to the LPS-Flex group having more flexion than that of in the Scorpio-Flex group.

Keywords: Total knee arthroplasty, High-Flex, LPS-Flex, Scorpio-Flex

Figures and Tables

Table 1

Comparison of Preoperative Variables between LPS-Flex Group and Scorpio-Flex Group

^*KSKS, Knee Society Knee Score; ^†KSFS, Knee Society Function Score.

Table 2

Comparison of Postoperative Variables between LPS-Flex Group and Scorpio-Flex Group

^*Delta flexion, difference in preoperative and postoperative flexion; ^†KSKS, Knee Society Knee Score; ^‡KSFS, Knee Society Function Score; ^§WOMAC, Western Ontario and McMaster Universities Osteoarthritis index; ^∥A significant difference was demonstrated between LPS-Flex group and Scorpio-Flex group (p<0.05).

Table 3

Comparison of Functional Results between LPS-Flex Group and Scorpio-Flex Group

^*A significant difference was demonstrated between LPS-Flex group and Scorpio-Flex group (p<0.05).

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