J Korean Orthop Assoc.  2016 Apr;51(2):145-150. 10.4055/jkoa.2016.51.2.145.

Results of High-Flex Total Knee Arthroplasty: Minimum 3-Year Follow-Up Result

• Kim HJ
• Kim TS
• Mun JU
• Kyung HS

• KMID: 2162049
• DOI: http://doi.org/10.4055/jkoa.2016.51.2.145

Abstract

PURPOSE
The purpose of this study was to evaluate the results of high-flexion total knee arthroplasty.
MATERIALS AND METHODS
We evaluated 355 patients (372 cases) who underwent total knee arthroplasty using high-flexion implants from January 2005 to December 2011. The patients included 36 men and 336 women with a mean age of 70.6 (52-88 years) years. Average follow-up duration was 59 months (36-77 months) months. Three types of high flexion implants were used in this study. We performed preoperative assessment and last follow-up clinical evaluation was performed using range of motion (ROM), knee score and function score according to the knee society clinical rating system and complications. Radiologic evaluation was performed using plain radiographs to evaluate loosening or osteolysis.
RESULTS
The mean ROM increased from 114.9° preoperatively to 127.0° at the final follow-up. The average knee score improved from 60.5 points preoperatively to 90.9 points at final follow-up and knee function score improved from 49.0 to 84.4 points. The clinical results were improved in each type of implants. A radiolucent line was detected in 2 cases in the Sigma rotating platform flexion group and patellar tendon rupture occurred in 1 case in the NexGex legacy posterior-stabilized-flex group. Infection occurred in 2 cases after 2 and 5 years postoperatively in the Scorpio non-restrictive geometry group and were treated with revision arthroplasty. No significant loosening was observed.
CONCLUSION
This study obtained good results after total knee arthroplasty using high-flexion implants, and no loosening was observed. There were no differences in the type of implants in regard to the ROM and clinical variables.

Keyword

total knee arthroplasty; high-flexion implants

MeSH Terms

Arthroplasty*
Female
Follow-Up Studies*
Humans
Knee*
Male
Osteolysis
Patellar Ligament
Range of Motion, Articular
Rupture

Figure

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  Figure 1 A lateral radiograph of the left knee of a 62-year-old female who underwent total knee arthroplasty using Sigma rotating platform flexion implants postoperatively 1 year. A radiolucent line was observed in the posterior femoral condyle (arrow).

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  Figure 2 An antero-posterior radiograph of the right knee of a 66-yearold female who underwent total knee arthroplasty using Sigma rotating platform flexion implants postoperatively 1 year. A radiolucent line was observed in the medial tibia condyle (arrow).

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  Figure 3 Antero-posterior and lateral radiographs of the right knee of a 77-year-old female underwent total knee arthroplasty using NexGen legacy posterior-stabilized-flex implants postoperatively 1 month. An avulsion fracture of the patellar tendon was detected as a complication in a lateral radiograph (arrow).

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