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

19 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 1

Keywords

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

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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