Sagittal cutting error changes femoral anteroposterior sizing in total knee arthroplasty

Hiroyuki Nakahara, Shuichi Matsuda, Ken Okazaki, Yasutaka Tashiro, Yukihide Iwamoto

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Background: Prosthetic alignment and size are important factors in achieving a long-term survival in TKA. Although two-dimensional and three-dimensional (3-D) planning for component sizing has been introduced, it sometimes is difficult to cut the bones accurately according to preoperative planning. It is unclear whether changing sagittal alignment of the distal femur affects the AP dimension and sizing of the prepared bone. Questions/Purposes: We therefore determined whether the AP dimension of the prepared distal femur increases if the distal femur is cut in extension and decreases if it is cut in flexion. Methods: One hundred knees were evaluated using 3-D imaging software. The AP dimension of the cutting surface was measured when the femoral component was aligned perpendicular to the anatomic axis. The measurement was repeated when the distal bone cut was planned in flexed positions of 3° and 5° and extended positions of 3° and 5°. Results: The AP dimension of the prepared femur was increased by 2 and 3 mm with 3° and 5° extension, respectively. The AP dimension of the prepared femur was decreased by 2 and 3 mm with 3° and 5° flexion, respectively. Conclusions: Our data suggest upsizing or downsizing of the femoral component can occur if the femoral osteotomy is performed in at least 3° extension or flexion. Level of Evidence: Level II, diagnostic study. See Guidelines for Authors for a complete description of levels of evidence.

Original languageEnglish
Pages (from-to)3560-3565
Number of pages6
JournalClinical orthopaedics and related research
Volume470
Issue number12
DOIs
Publication statusPublished - Dec 2012

All Science Journal Classification (ASJC) codes

  • Surgery
  • Orthopedics and Sports Medicine

Fingerprint Dive into the research topics of 'Sagittal cutting error changes femoral anteroposterior sizing in total knee arthroplasty'. Together they form a unique fingerprint.

  • Cite this