Accuracy of Implant Positioning for Minimally Invasive Total Knee Arthroplasty in Patients With Severe Varus Deformity

• Published in: The Journal of arthroplasty 2010-04, Vol.25 (3), p.381-386
• Main Authors: Niki, Yasuo, MD, Matsumoto, Hideo, MD, Otani, Toshiro, MD, Enomoto, Hiroyuki, MD, Toyama, Yoshiaki, MD, Suda, Yasunori, MD
• Format: Article
• Language: English
• Subjects: Adult; Aged; Aged, 80 and over; Arthroplasty, Replacement, Knee - adverse effects; Arthroplasty, Replacement, Knee - methods; Arthroplasty, Replacement, Knee - standards; Biomechanical Phenomena; Female; Humans; implant positioning; Infection - etiology; Joint Deformities, Acquired - surgery; Knee Joint - surgery; Knee Prosthesis; Male; mechanical axis; Middle Aged; minimally invasive; Minimally Invasive Surgical Procedures - adverse effects; Minimally Invasive Surgical Procedures - methods; Minimally Invasive Surgical Procedures - standards; Orthopedics; Pulmonary Embolism - etiology; radiographic accuracy; Range of Motion, Articular; Retrospective Studies; Severity of Illness Index; total knee arthroplasty; Treatment Outcome
• ISSN: 0883-5403; 1532-8406
• DOI: 10.1016/j.arth.2009.01.004

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