Accuracy of implant positioning for minimally invasive total knee arthroplasty in patients with severe varus deformity

Yasuo Niki, Hideo Matsumoto, Toshiro Otani, Hiroyuki Enomoto, Yoshiaki Toyama, Yasunori Suda

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Minimally invasive surgery (MIS) in total knee arthroplasty (TKA) reportedly yields decreased patient morbidity and a rapid return of function, but how much deformity can be accepted for MIS-TKA remains unclear. This study investigated 238 knees from 218 consecutive patients who underwent MIS-TKA. Patients were divided into groups with tibiofemoral mechanical axis (TFM) 195° or greater and TFM less than 195°, then clinical and radiographic results were compared. Similar improvements in knee score at 3 months postoperatively were obtained in the both groups, whereas radiographic accuracy of the coronal alignment in the TFM ≥195° group was inferior to that in TFM <195° group. Postoperative TFM was significantly worsened in patients with lateral bowing angle of the femoral shaft (LBFS) 4° or greater, and 53% of patients in the TFM ≥195° group displayed LBFS 4° or greater, explaining the inferior radiographic accuracy in this group compared with the TFM <195° group. These results indicate that use of MIS techniques decreases radiographic accuracy, particularly in patients with severe genu varum and increased LBFS.

Original languageEnglish
Pages (from-to)381-386
Number of pages6
JournalJournal of Arthroplasty
Volume25
Issue number3
DOIs
Publication statusPublished - 2010 Apr

Fingerprint

Knee Replacement Arthroplasties
Minimally Invasive Surgical Procedures
Thigh
Knee
Genu Varum
Morbidity

Keywords

  • Implant positioning
  • Mechanical axis
  • Minimally invasive
  • Radiographic accuracy
  • Total knee arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

Cite this

Accuracy of implant positioning for minimally invasive total knee arthroplasty in patients with severe varus deformity. / Niki, Yasuo; Matsumoto, Hideo; Otani, Toshiro; Enomoto, Hiroyuki; Toyama, Yoshiaki; Suda, Yasunori.

In: Journal of Arthroplasty, Vol. 25, No. 3, 04.2010, p. 381-386.

Research output: Contribution to journalArticle

Niki, Yasuo ; Matsumoto, Hideo ; Otani, Toshiro ; Enomoto, Hiroyuki ; Toyama, Yoshiaki ; Suda, Yasunori. / Accuracy of implant positioning for minimally invasive total knee arthroplasty in patients with severe varus deformity. In: Journal of Arthroplasty. 2010 ; Vol. 25, No. 3. pp. 381-386.
@article{370180aacb9743c793e913b23ffd898a,
title = "Accuracy of implant positioning for minimally invasive total knee arthroplasty in patients with severe varus deformity",
abstract = "Minimally invasive surgery (MIS) in total knee arthroplasty (TKA) reportedly yields decreased patient morbidity and a rapid return of function, but how much deformity can be accepted for MIS-TKA remains unclear. This study investigated 238 knees from 218 consecutive patients who underwent MIS-TKA. Patients were divided into groups with tibiofemoral mechanical axis (TFM) 195° or greater and TFM less than 195°, then clinical and radiographic results were compared. Similar improvements in knee score at 3 months postoperatively were obtained in the both groups, whereas radiographic accuracy of the coronal alignment in the TFM ≥195° group was inferior to that in TFM <195° group. Postoperative TFM was significantly worsened in patients with lateral bowing angle of the femoral shaft (LBFS) 4° or greater, and 53{\%} of patients in the TFM ≥195° group displayed LBFS 4° or greater, explaining the inferior radiographic accuracy in this group compared with the TFM <195° group. These results indicate that use of MIS techniques decreases radiographic accuracy, particularly in patients with severe genu varum and increased LBFS.",
keywords = "Implant positioning, Mechanical axis, Minimally invasive, Radiographic accuracy, Total knee arthroplasty",
author = "Yasuo Niki and Hideo Matsumoto and Toshiro Otani and Hiroyuki Enomoto and Yoshiaki Toyama and Yasunori Suda",
year = "2010",
month = "4",
doi = "10.1016/j.arth.2009.01.004",
language = "English",
volume = "25",
pages = "381--386",
journal = "Journal of Arthroplasty",
issn = "0883-5403",
publisher = "Churchill Livingstone",
number = "3",

}

TY - JOUR

T1 - Accuracy of implant positioning for minimally invasive total knee arthroplasty in patients with severe varus deformity

AU - Niki, Yasuo

AU - Matsumoto, Hideo

AU - Otani, Toshiro

AU - Enomoto, Hiroyuki

AU - Toyama, Yoshiaki

AU - Suda, Yasunori

PY - 2010/4

Y1 - 2010/4

N2 - Minimally invasive surgery (MIS) in total knee arthroplasty (TKA) reportedly yields decreased patient morbidity and a rapid return of function, but how much deformity can be accepted for MIS-TKA remains unclear. This study investigated 238 knees from 218 consecutive patients who underwent MIS-TKA. Patients were divided into groups with tibiofemoral mechanical axis (TFM) 195° or greater and TFM less than 195°, then clinical and radiographic results were compared. Similar improvements in knee score at 3 months postoperatively were obtained in the both groups, whereas radiographic accuracy of the coronal alignment in the TFM ≥195° group was inferior to that in TFM <195° group. Postoperative TFM was significantly worsened in patients with lateral bowing angle of the femoral shaft (LBFS) 4° or greater, and 53% of patients in the TFM ≥195° group displayed LBFS 4° or greater, explaining the inferior radiographic accuracy in this group compared with the TFM <195° group. These results indicate that use of MIS techniques decreases radiographic accuracy, particularly in patients with severe genu varum and increased LBFS.

AB - Minimally invasive surgery (MIS) in total knee arthroplasty (TKA) reportedly yields decreased patient morbidity and a rapid return of function, but how much deformity can be accepted for MIS-TKA remains unclear. This study investigated 238 knees from 218 consecutive patients who underwent MIS-TKA. Patients were divided into groups with tibiofemoral mechanical axis (TFM) 195° or greater and TFM less than 195°, then clinical and radiographic results were compared. Similar improvements in knee score at 3 months postoperatively were obtained in the both groups, whereas radiographic accuracy of the coronal alignment in the TFM ≥195° group was inferior to that in TFM <195° group. Postoperative TFM was significantly worsened in patients with lateral bowing angle of the femoral shaft (LBFS) 4° or greater, and 53% of patients in the TFM ≥195° group displayed LBFS 4° or greater, explaining the inferior radiographic accuracy in this group compared with the TFM <195° group. These results indicate that use of MIS techniques decreases radiographic accuracy, particularly in patients with severe genu varum and increased LBFS.

KW - Implant positioning

KW - Mechanical axis

KW - Minimally invasive

KW - Radiographic accuracy

KW - Total knee arthroplasty

UR - http://www.scopus.com/inward/record.url?scp=77950504275&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77950504275&partnerID=8YFLogxK

U2 - 10.1016/j.arth.2009.01.004

DO - 10.1016/j.arth.2009.01.004

M3 - Article

C2 - 20347714

AN - SCOPUS:77950504275

VL - 25

SP - 381

EP - 386

JO - Journal of Arthroplasty

JF - Journal of Arthroplasty

SN - 0883-5403

IS - 3

ER -