title: Five-year follow-up of minimally invasive computer assisted total knee arthroplasty (MICATKA) versus conventional computer assisted total knee arthroplasty (CATKA) - A population matched study.
abstract: BACKGROUND
  Minimally invasive surgery (MIS) has perceived advantages in the early post-operative stage such as reduced blood loss, decreased pain, earlier return to function and earlier discharge. The aim of our study was to confirm that longer term clinical outcome of TKA is not compromised when MIS is combined with computer assisted surgery.
  
  
  METHODS
  Eighty patients matched for age, gender, pre-operative Knee Society Score (KSS) and mechanical axis were prospectively studied. Forty patients underwent minimally invasive computer assisted total knee arthroplasty (MICATKA) and 40 patients underwent conventional computer assisted TKA (CATKA). Functional scores were determined at 6 weeks, 6, 12, 18, and 24 months and 5 years post-surgery. Long-leg alignment views were obtained 3 months post-operatively.
  
  
  RESULTS
  KSSs in the short term were significantly better in the MICATKA group than in the CATKA group (p<000.1). Tourniquet-time was 58 min in the MICTKA group and 60 min in the CATKA group (p=0.3). Straight leg raise was achieved by day one in 93% of the MICATKA group compared to 30% of the CATKA group (p<0.001). Length of stay for the MICATKA group has a mean of 3.25 days and a mean of 6 days for the CATKA group (p<0.001). KSSs up to 2-years were significantly better in the MICTKA group (p<0.001). At 5-years there was no significant difference in KSSs (p=0.46) in the MICATKA and CATKA groups.
  
  
  CONCLUSIONS
  We confirm that the use of navigation in minimally invasive TKA permits a number of early post-operative advantages and that longer-term functional outcome is not compromised with its usage.
  
  
  METHODS
  Level II.
authors.affiliation: Brighton and Sussex University Hospitals, Eastern Road, Brighton BN2 5BE, United Kingdom. Electronic address: raghbir.khakha@gmail.com.
authors.forename: R S
authors.initials: RS
authors.lastname: Khakha
authors.affiliation: Brighton and Sussex University Hospitals, Eastern Road, Brighton BN2 5BE, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Chowdhry
authors.affiliation: Brighton and Sussex University Hospitals, Eastern Road, Brighton BN2 5BE, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Norris
authors.affiliation: Brighton and Sussex University Hospitals, Eastern Road, Brighton BN2 5BE, United Kingdom.
authors.forename: A
authors.initials: A
authors.lastname: Kheiran
authors.affiliation: Brighton and Sussex University Hospitals, Eastern Road, Brighton BN2 5BE, United Kingdom.
authors.forename: N
authors.initials: N
authors.lastname: Patel
authors.affiliation: Brighton and Sussex University Hospitals, Eastern Road, Brighton BN2 5BE, United Kingdom.
authors.forename: S K
authors.initials: SK
authors.lastname: Chauhan
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007902:Length of Stay; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000009:adverse effects / Q000379:methods; D061646:Operative Time; D020370:Osteoarthritis, Knee / Q000601:surgery*; D020127:Recovery of Function; D012189:Retrospective Studies; D025321:Surgery, Computer-Assisted / Q000009:adverse effects / Q000379:methods*; D013997:Time Factors; D016896:Treatment Outcome
keywords: Computer navigation; Minimally invasive; TKR