A Comparative Study between High-Flex and Non High-Flex Total Knee Arthroplasty

Jeong-Seok Moon; Kun-Sik Yu; Chul-Won Ha

doi:10.4055/jkoa.2007.42.3.360

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Moon, Yu, and Ha: A Comparative Study between High-Flex and Non High-Flex Total Knee Arthroplasty

Original Article

Journal of the Korean Orthopaedic Association

Journal of the Korean Orthopaedic Association 2007; 42(3): 360-365.

Published online: 30 June 2007

DOI: https://doi.org/10.4055/jkoa.2007.42.3.360

A Comparative Study between High-Flex and Non High-Flex Total Knee Arthroplasty

Jeong-Seok Moon, M.D., Kun-Sik Yu, M.D.^*, Chul-Won Ha, M.D.

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

^*Department of Orthopedic Surgery, Ulsan Central Hospital, Ulsan, Korea.

Address reprint requests to Chul-Won Ha, M.D. Department of Orthopedic Surgery, Samsung Medical Center, School of Medicine, Sungkyunkwan Univiersity, 50, Ilwong-dong, Gangnam-gu, Seoul 135-710, Korea. Tel: +82.2-3410-0275, Fax: +82.2-3410-0061, hacw@smc.samsung.co.kr

Abstract

Purpose

The purpose of this study was to compare the clinical results of a high-flex design (Scorpioflex®, Stryker) in total knee arthroplasty with those of a non-high-flex design (Scorpio® PS type, Stryker).

Materials and Methods

Fifty-two knees with at least 120 degrees of further flexion preoperatively underwent total knee arthroplasty. Of the 52 knees, there were 35 knees in the high-flex design (HF group) and 17 knees in the non high-flex design (non-HF group). The clinical results were evaluated by postoperative further flexion at 3 months, 6 months, 1 year, 2 years and 3 years, as well as by Delta flexion, which means postoperative flexion improvement. The Knee Society Score and X-rays were evaluated preoperatively and at the 3-year follow-up.

Results

The HF group showed significantly greater flexion than the non-HF group at 3 months postoperatively (p=0.000). The delta flexion was also greater in the HF group at 3 months postoperatively (p=0.000). The Knee Society Score and X-rays were similar in the two groups at the final follow-up (p>0.05).

Conclusion

High-flex total knee arthroplasty appears to facilitate greater flexion in the first 3 months postoperatively, but there is no significant difference between both groups with regard to the range of motion, clinical and radiographic variables after 3 months.

Keywords: Knee, High-flex design, Total knee arthroplasty

Figures and Tables

Table 1

A Comparison of the Preoperative Variables between the High-flex and Non High-flex Total Knee Arthroplasty Groups

^*T-F, tibio-femoral; ^†KSKS, Knee Society Knee Score; ^‡KSFS, Knee Society Function Score.

Table 2

Comparison of the Further Flexion between the High-flex and Non High-flex Total Knee Arthroplasty Groups

^*HF-TKA, high flex-total knee arthroplasty; ^†NHF-TKA, non high flex-total knee arthroplasty.

Table 3

Comparison of the Delta Flexion between the High-flex and Non High-flex Total Knee Arthroplasty Groups

^*HF-TKA, high flex-total knee arthroplasty; ^†NHF-TKA, non high flex-total knee arthroplasty.

Table 4

A Comparison of the Postoperative Variables between the High-flex and Non High-flex Total Knee Arthroplasty Groups at the Final Follow-up

^*T-F, tibio-femoral; ^†KSKS, Knee Society Knee Score; ^‡KSFS, Knee Society Function Score.

Table 5

Factors Included in Spearman Partial Correlation Analysis

^*T-F, tibio-femoral; ^†KSKS, Knee Society Knee Score; ^‡KSFS, Knee Society Function Score.

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