title: Total versus unicompartmental knee replacement for isolated lateral osteoarthritis: a matched-pairs study.
abstract: OBJECTIVE
  The aim of this study was to compare the functional outcome of patients following unicompartmental knee replacement (UKR) using the Oxford domed lateral UKR to patients who underwent cruciate-retaining total knee replacement (TKR) for isolated osteoarthritis in the lateral compartment.
  
  
  METHODS
  With the help of our institutional database, we retrospectively identified 22 matched pairs with regards to age, gender and body mass index (BMI). Functional outcome was measured using the Oxford Knee Score (OKS) and range of motion (ROM). Complications and revisions were recorded.
  
  
  RESULTS
  The mean follow-up was 22 (UKR) and 19 (TKR) months, respectively. Patients following UKR had a statistically significant higher mean postoperative OKS and ROM: mean OKS was 43 [standard deviation (SD) 4] for UKR and 37 (SD 9) for TKR, respectively (p = 0.023); ROM was 127° (SD 13) for UKR and 107° (SD 17) for TKR (p < 0.001). Additionally the change in score was statistically significant higher in patients following UKR in the OKS (14.3 (SD 6) vs. 9.6 (SD 8)) and in the range of motion (+12° (SD 19) vs. -3° (SD 20)), (p = 0.041 and p = 0.01 respectively). Survival at two years using revision for any reason as the endpoint was 96% [95% confidence interval (CI) 72-99] for UKR and 100% for TKR (Log-rank test, p = 0.317).
  
  
  CONCLUSIONS
  The functional results of mobile-bearing UKR for isolated osteoarthritis in the lateral compartment compare favourably to those after cruciate-retaining TKR in the short term. To compare survival and complications after both procedures, longer-term follow-up is necessary.
authors.affiliation: Department of Orthopaedic and Trauma Surgery, University of Heidelberg, Schlierbacher Landstrasse 200a, 69118, Heidelberg, Germany.
authors.forename: Tilman
authors.initials: T
authors.lastname: Walker
authors.forename: Tobias
authors.initials: T
authors.lastname: Gotterbarm
authors.forename: Thomas
authors.initials: T
authors.lastname: Bruckner
authors.forename: Christian
authors.initials: C
authors.lastname: Merle
authors.forename: Marcus R
authors.initials: MR
authors.lastname: Streit
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D016555:Matched-Pair Analysis; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000503:physiopathology / Q000601:surgery*; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D020127:Recovery of Function / Q000502:physiology
references.citation: J Arthroplasty. 2013 Mar;28(3):439-44
references.pmid: 23433255
references.citation: Cochrane Database Syst Rev. 2013 Oct 11;(10):CD004803
references.pmid: 24114343
references.citation: Clin Orthop Relat Res. 2010 Jan;468(1):57-63
references.pmid: 19844772
references.citation: J Bone Joint Surg Br. 2007 Aug;89(8):1010-4
references.pmid: 17785736
references.citation: J Bone Joint Surg Br. 2012 Jul;94(7):928-31
references.pmid: 22733947
references.citation: Clin Orthop Relat Res. 2011 Jan;469(1):174-9
references.pmid: 20706811
references.citation: Clin Orthop Relat Res. 2009 Jun;467(6):1450-7
references.pmid: 19225852
references.citation: Int Orthop. 2014 Feb;38(2):449-55
references.pmid: 24337799
references.citation: Clin Orthop Relat Res. 1991 Dec;(273):151-6
references.pmid: 1959264
references.citation: Bone Joint J. 2014 Jan;96-B(1):59-64
references.pmid: 24395312
references.citation: Clin Orthop Relat Res. 2006 Oct;451:101-6
references.pmid: 16760806
references.citation: Singapore Med J. 2003 Nov;44(11):559-62
references.pmid: 15007494
references.citation: J Bone Joint Surg Br. 2001 Mar;83(2):191-4
references.pmid: 11284563
references.citation: Int Orthop. 2009 Apr;33(2):431-5
references.pmid: 18392620
references.citation: J Bone Joint Surg Br. 2009 Jan;91(1):52-7
references.pmid: 19092004
references.citation: J Bone Joint Surg Br. 1998 Sep;80(5):862-5
references.pmid: 9768899
references.citation: Knee. 2013 Dec;20(6):466-70
references.pmid: 23274066
references.citation: Acta Orthop. 2010 Feb;81(1):5-7
references.pmid: 20170420
references.citation: Eur J Orthop Surg Traumatol. 2014 Aug;24(6):987-91
references.pmid: 23842661
references.citation: Clin Orthop Relat Res. 2012 Jan;470(1):84-90
references.pmid: 22038173
references.citation: J Arthroplasty. 2012 Sep;27(8 Suppl):86-90
references.pmid: 22560653
references.citation: Int Orthop. 2010 Mar;34(3):349-54
references.pmid: 19898821
references.citation: J Arthroplasty. 2001 Dec;16(8):970-6
references.pmid: 11740750
references.citation: J Arthroplasty. 2008 Feb;23(2):175-81
references.pmid: 18280409
references.citation: J Arthroplasty. 2007 Jan;22(1):48-56
references.pmid: 17197308
references.citation: Arch Orthop Trauma Surg. 2010 Dec;130(12):1539-48
references.pmid: 20559645
references.citation: Int Orthop. 2007 Jun;31(3):315-9
references.pmid: 16896871
references.citation: Knee Surg Sports Traumatol Arthrosc. 2013 Nov;21(11):2487-94
references.pmid: 22926671
references.citation: Clin Orthop Relat Res. 2014 Jan;472(1):133-7
references.pmid: 24061845
references.citation: Bone Joint J. 2013 Feb;95-B(2):177-80
references.pmid: 23365025
references.citation: Int Orthop. 2014 Feb;38(2):235-41
references.pmid: 24346512
references.citation: Acta Orthop Scand. 1999 Apr;70(2):170-5
references.pmid: 10366919
references.citation: J Bone Joint Surg Br. 2010 Sep;92(9):1253-8
references.pmid: 20798443
references.citation: J Bone Joint Surg Br. 2006 Jan;88(1):54-60
references.pmid: 16365121
references.citation: Knee. 2010 Dec;17(6):392-7
references.pmid: 19919897
references.citation: J Arthroplasty. 2004 Apr;19(3):349-53
references.pmid: 15067650
references.citation: J Knee Surg. 2006 Apr;19(2):112-6
references.pmid: 16642887
references.citation: J Bone Joint Surg Br. 2012 Oct;94(10):1356-61
references.pmid: 23015560
references.citation: Acta Orthop Belg. 2007 Feb;73(1):55-9
references.pmid: 17441659