title: Minimum 5-year Follow-up Results of Minimally Invasive Total Knee Arthroplasty Using Mini-Keel Modular Tibial Implant.
abstract: OBJECTIVE
  To evaluate the minimum 5-year mid-term clinical and radiological results of minimally invasive surgery total knee arthroplasty (MIS-TKA) using a mini-keel modular tibia component.
  
  
  METHODS
  We retrospectively evaluated 254 patients (361 cases) who underwent MIS-TKA between 2005 and 2006. The latest clinical and radiological assessments were done in 168 cases that had been followed on an outpatient basis for more than 5 postoperative years. Clinical results were assessed using the Hospital for Special Surgery (HSS) score and Knee Society score. Radiological evaluation included measurements of knee alignment.
  
  
  RESULTS
  The average postoperative knee range of motion and HSS score were 134.3°±12.4° and 92.7°±7.0°, respectively. The average postoperative femorotibial angle and tibial component alignment angle were 5.2°±1.7° valgus and 90.2°±1.6°, respectively. The average tibial component posterior inclination was 4.8°±2.1°. The percentage of cases with tibial component alignment angle of 90°±3° was 96.1%, and that with the femorotibial angle of 6°±3° valgus was 94.0%. Radiolucent lines were observed in 20 cases (12.0%): around the femur, tibia, and patella in 14 cases, 10 cases, and 1 case, respectively. However, they were less than 2 mm and non-progressive in all cases. The survival rate was 99.4% and there was no implant-related revision.
  
  
  CONCLUSIONS
  MIS-TKA using a mini-keel modular tibial plate showed satisfactory results, a high survival rate, and excellent clinical and radiological results in the mid-term follow-up.
authors.affiliation: Department of Orthopedic Surgery, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
authors.forename: Ju-Hyung
authors.initials: JH
authors.lastname: Yoo
authors.affiliation: Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Byoung-Kyu
authors.initials: BK
authors.lastname: Park
authors.affiliation: Department of Orthopedic Surgery, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Chang-Dong
authors.initials: CD
authors.lastname: Han
authors.affiliation: Department of Orthopedic Surgery, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
authors.forename: Hyun-Cheol
authors.initials: HC
authors.lastname: Oh
authors.affiliation: Department of Orthopedic Surgery, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
authors.forename: Sang-Hoon
authors.initials: SH
authors.lastname: Park
keywords: Arthroplasty; Knee; Mini-keel tibial component; Minimally invasive