Morphometric Assessment of Resected Femoral Cut Surface in Korean Knees and Its Fitting With Western-Designed Femoral Components

Teck S. Fong, Seong Chan Kim, Ji Eui Kim, Eui Soo Lee, Tae Woo Kim, Yong Seuk Lee

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Background: This study aimed at assessing the morphometry of resected femurs in Korean patients during total knee arthroplasty (TKA) and comparing these measurements with current Western-designed femoral component dimensions. Methods: This single-blind, prospective, randomized, controlled trial involved intraoperative measurements for 271 femoral component implantations from 3 contemporary TKA systems, with 2 systems offering narrow sizing options. The difference between femoral component dimensions and the resected surface of distal femur was measured in millimeters at 5 distinct zones. Results: Overhang of standard femoral component was common in the anterior-medial condyle and anterior-lateral condyle ranging from 50.8% to 99.0% and 21.5% to 88.0%, respectively. With narrow femoral components, the rate of overhang reduced to 21.5%-30.2% and 9.2%-32.1%. Conversely, underhang rates were higher over the anterior flange width, middle medial-lateral and posterior medial-lateral zones. Standard components displayed higher underhang rates at these zones compared to narrow components. The good fit rate for femoral component was low among the 3 systems ranging from 1.0% to 56.0%. System with narrow option sizing increases the underhang rates in males, while improving the component fit among females at similar zones with rate ranging from 5.2% to 52.9%. Conclusion: Currently available TKA implant designs may not provide a perfect match for the distal femoral shape of the Korean population. The availability of implants with standard and narrow options can substantially improve the optimal fitting of femoral components in the Korean population.

Original languageEnglish
Pages (from-to)1929-1937
Number of pages9
JournalJournal of Arthroplasty
Volume34
Issue number9
DOIs
StatePublished - 1 Sep 2019

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Thigh
Knee
Knee Replacement Arthroplasties
Femur
Single-Blind Method
Bone and Bones
Population
Randomized Controlled Trials

Keywords

  • Korean population
  • component overhang
  • femoral prosthesis
  • knee
  • total knee arthroplasty

Cite this

Fong, Teck S. ; Kim, Seong Chan ; Kim, Ji Eui ; Lee, Eui Soo ; Kim, Tae Woo ; Lee, Yong Seuk. / Morphometric Assessment of Resected Femoral Cut Surface in Korean Knees and Its Fitting With Western-Designed Femoral Components. In: Journal of Arthroplasty. 2019 ; Vol. 34, No. 9. pp. 1929-1937.
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title = "Morphometric Assessment of Resected Femoral Cut Surface in Korean Knees and Its Fitting With Western-Designed Femoral Components",
abstract = "Background: This study aimed at assessing the morphometry of resected femurs in Korean patients during total knee arthroplasty (TKA) and comparing these measurements with current Western-designed femoral component dimensions. Methods: This single-blind, prospective, randomized, controlled trial involved intraoperative measurements for 271 femoral component implantations from 3 contemporary TKA systems, with 2 systems offering narrow sizing options. The difference between femoral component dimensions and the resected surface of distal femur was measured in millimeters at 5 distinct zones. Results: Overhang of standard femoral component was common in the anterior-medial condyle and anterior-lateral condyle ranging from 50.8{\%} to 99.0{\%} and 21.5{\%} to 88.0{\%}, respectively. With narrow femoral components, the rate of overhang reduced to 21.5{\%}-30.2{\%} and 9.2{\%}-32.1{\%}. Conversely, underhang rates were higher over the anterior flange width, middle medial-lateral and posterior medial-lateral zones. Standard components displayed higher underhang rates at these zones compared to narrow components. The good fit rate for femoral component was low among the 3 systems ranging from 1.0{\%} to 56.0{\%}. System with narrow option sizing increases the underhang rates in males, while improving the component fit among females at similar zones with rate ranging from 5.2{\%} to 52.9{\%}. Conclusion: Currently available TKA implant designs may not provide a perfect match for the distal femoral shape of the Korean population. The availability of implants with standard and narrow options can substantially improve the optimal fitting of femoral components in the Korean population.",
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Morphometric Assessment of Resected Femoral Cut Surface in Korean Knees and Its Fitting With Western-Designed Femoral Components. / Fong, Teck S.; Kim, Seong Chan; Kim, Ji Eui; Lee, Eui Soo; Kim, Tae Woo; Lee, Yong Seuk.

In: Journal of Arthroplasty, Vol. 34, No. 9, 01.09.2019, p. 1929-1937.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Morphometric Assessment of Resected Femoral Cut Surface in Korean Knees and Its Fitting With Western-Designed Femoral Components

AU - Fong, Teck S.

AU - Kim, Seong Chan

AU - Kim, Ji Eui

AU - Lee, Eui Soo

AU - Kim, Tae Woo

AU - Lee, Yong Seuk

PY - 2019/9/1

Y1 - 2019/9/1

N2 - Background: This study aimed at assessing the morphometry of resected femurs in Korean patients during total knee arthroplasty (TKA) and comparing these measurements with current Western-designed femoral component dimensions. Methods: This single-blind, prospective, randomized, controlled trial involved intraoperative measurements for 271 femoral component implantations from 3 contemporary TKA systems, with 2 systems offering narrow sizing options. The difference between femoral component dimensions and the resected surface of distal femur was measured in millimeters at 5 distinct zones. Results: Overhang of standard femoral component was common in the anterior-medial condyle and anterior-lateral condyle ranging from 50.8% to 99.0% and 21.5% to 88.0%, respectively. With narrow femoral components, the rate of overhang reduced to 21.5%-30.2% and 9.2%-32.1%. Conversely, underhang rates were higher over the anterior flange width, middle medial-lateral and posterior medial-lateral zones. Standard components displayed higher underhang rates at these zones compared to narrow components. The good fit rate for femoral component was low among the 3 systems ranging from 1.0% to 56.0%. System with narrow option sizing increases the underhang rates in males, while improving the component fit among females at similar zones with rate ranging from 5.2% to 52.9%. Conclusion: Currently available TKA implant designs may not provide a perfect match for the distal femoral shape of the Korean population. The availability of implants with standard and narrow options can substantially improve the optimal fitting of femoral components in the Korean population.

AB - Background: This study aimed at assessing the morphometry of resected femurs in Korean patients during total knee arthroplasty (TKA) and comparing these measurements with current Western-designed femoral component dimensions. Methods: This single-blind, prospective, randomized, controlled trial involved intraoperative measurements for 271 femoral component implantations from 3 contemporary TKA systems, with 2 systems offering narrow sizing options. The difference between femoral component dimensions and the resected surface of distal femur was measured in millimeters at 5 distinct zones. Results: Overhang of standard femoral component was common in the anterior-medial condyle and anterior-lateral condyle ranging from 50.8% to 99.0% and 21.5% to 88.0%, respectively. With narrow femoral components, the rate of overhang reduced to 21.5%-30.2% and 9.2%-32.1%. Conversely, underhang rates were higher over the anterior flange width, middle medial-lateral and posterior medial-lateral zones. Standard components displayed higher underhang rates at these zones compared to narrow components. The good fit rate for femoral component was low among the 3 systems ranging from 1.0% to 56.0%. System with narrow option sizing increases the underhang rates in males, while improving the component fit among females at similar zones with rate ranging from 5.2% to 52.9%. Conclusion: Currently available TKA implant designs may not provide a perfect match for the distal femoral shape of the Korean population. The availability of implants with standard and narrow options can substantially improve the optimal fitting of femoral components in the Korean population.

KW - Korean population

KW - component overhang

KW - femoral prosthesis

KW - knee

KW - total knee arthroplasty

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M3 - Article

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SP - 1929

EP - 1937

JO - Journal of Arthroplasty

JF - Journal of Arthroplasty

SN - 0883-5403

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