Does new instrumentation improve radiologic alignment of the Oxford® medial unicompartmental knee arthroplasty?

Ki-Mo Jang, Hong Chul Lim, Seung Beom Han, Chandong Jeong, Seul Gi Kim, Ji Hoon Bae

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Background A new instrument system has been introduced to improve the accuracy and reproducibility of implant positioning in Oxford® unicompartmental knee arthroplasty (UKA). This study aimed to determine if the new instrumentation could improve postoperative implant positioning and limb alignment, and reduce the occurrence of outliers in Oxford® UKA. Methods A total of 77 cases of Oxford® UKA with the new instrumentation were included. Individual matching for the conventional instrument group was performed according to age, sex, and body mass index. Postoperative radiological variables, including the hip-knee-ankle angle and the varus/valgus and flexion/extension angles of the femoral and tibial implants, were measured and compared between the new instrumentation group and the conventional group. The outliers in implant positions and postoperative complications were also compared. Results No significant between-group differences were observed in terms of lower limb alignment and tibial implant alignment. However, statistically significant differences were identified in the varus/valgus and flexion/extension angles of the femoral implant (P = 0.01 and P < 0.001, respectively). More outliers were observed in the flexion/extension angles of the femoral and tibial implants in the new instrumentation group. Eight meniscal bearing dislocations and three lateral compartmental degenerative changes were found in the conventional group, while there were two meniscal bearing dislocations in the new instrumentation group during the study period. Conclusion The present study did not confirm any benefit of the new instrument system in terms of postoperative limb alignment, positioning of the implant, or reducing outliers beyond the use of the conventional instruments.

Original languageEnglish
Pages (from-to)641-650
Number of pages10
JournalKnee
Volume24
Issue number3
DOIs
Publication statusPublished - 2017 Jun 1

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Knee Replacement Arthroplasties
Thigh
Extremities
Ankle
Hip
Lower Extremity
Knee
Body Mass Index

Keywords

  • Knee
  • Medial compartmental osteoarthritis
  • Microplasty instrumentation
  • Oxford® knee replacement
  • Unicompartmental knee arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

Does new instrumentation improve radiologic alignment of the Oxford® medial unicompartmental knee arthroplasty? / Jang, Ki-Mo; Lim, Hong Chul; Han, Seung Beom; Jeong, Chandong; Kim, Seul Gi; Bae, Ji Hoon.

In: Knee, Vol. 24, No. 3, 01.06.2017, p. 641-650.

Research output: Contribution to journalArticle

Jang, Ki-Mo ; Lim, Hong Chul ; Han, Seung Beom ; Jeong, Chandong ; Kim, Seul Gi ; Bae, Ji Hoon. / Does new instrumentation improve radiologic alignment of the Oxford® medial unicompartmental knee arthroplasty?. In: Knee. 2017 ; Vol. 24, No. 3. pp. 641-650.
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N2 - Background A new instrument system has been introduced to improve the accuracy and reproducibility of implant positioning in Oxford® unicompartmental knee arthroplasty (UKA). This study aimed to determine if the new instrumentation could improve postoperative implant positioning and limb alignment, and reduce the occurrence of outliers in Oxford® UKA. Methods A total of 77 cases of Oxford® UKA with the new instrumentation were included. Individual matching for the conventional instrument group was performed according to age, sex, and body mass index. Postoperative radiological variables, including the hip-knee-ankle angle and the varus/valgus and flexion/extension angles of the femoral and tibial implants, were measured and compared between the new instrumentation group and the conventional group. The outliers in implant positions and postoperative complications were also compared. Results No significant between-group differences were observed in terms of lower limb alignment and tibial implant alignment. However, statistically significant differences were identified in the varus/valgus and flexion/extension angles of the femoral implant (P = 0.01 and P < 0.001, respectively). More outliers were observed in the flexion/extension angles of the femoral and tibial implants in the new instrumentation group. Eight meniscal bearing dislocations and three lateral compartmental degenerative changes were found in the conventional group, while there were two meniscal bearing dislocations in the new instrumentation group during the study period. Conclusion The present study did not confirm any benefit of the new instrument system in terms of postoperative limb alignment, positioning of the implant, or reducing outliers beyond the use of the conventional instruments.

AB - Background A new instrument system has been introduced to improve the accuracy and reproducibility of implant positioning in Oxford® unicompartmental knee arthroplasty (UKA). This study aimed to determine if the new instrumentation could improve postoperative implant positioning and limb alignment, and reduce the occurrence of outliers in Oxford® UKA. Methods A total of 77 cases of Oxford® UKA with the new instrumentation were included. Individual matching for the conventional instrument group was performed according to age, sex, and body mass index. Postoperative radiological variables, including the hip-knee-ankle angle and the varus/valgus and flexion/extension angles of the femoral and tibial implants, were measured and compared between the new instrumentation group and the conventional group. The outliers in implant positions and postoperative complications were also compared. Results No significant between-group differences were observed in terms of lower limb alignment and tibial implant alignment. However, statistically significant differences were identified in the varus/valgus and flexion/extension angles of the femoral implant (P = 0.01 and P < 0.001, respectively). More outliers were observed in the flexion/extension angles of the femoral and tibial implants in the new instrumentation group. Eight meniscal bearing dislocations and three lateral compartmental degenerative changes were found in the conventional group, while there were two meniscal bearing dislocations in the new instrumentation group during the study period. Conclusion The present study did not confirm any benefit of the new instrument system in terms of postoperative limb alignment, positioning of the implant, or reducing outliers beyond the use of the conventional instruments.

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