The results of Oxford unicompartmental knee arthroplasty in the United States: a mean ten-year survival analysis.
OBJECTIVE
Approved by the Food and Drug Administration in 2004, the Phase III Oxford Medial Partial Knee is used to treat anteromedial osteoarthritis (AMOA) in patients with an intact anterior cruciate ligament. This unicompartmental knee arthroplasty (UKA) is relatively new in the United States, and therefore long-term American results are lacking.


METHODS
This is a single surgeon, retrospective study based on prospectively collected data, analysing a consecutive series of primary UKAs using the Phase III mobile-bearing Oxford Knee and Phase III instrumentation. Between July 2004 and December 2006, the senior author (RHE) carried out a medial UKA in 173 patients (213 knees) for anteromedial osteoarthritis or avascular necrosis (AVN). A total of 95 patients were men and 78 were women. Their mean age at surgery was 67 years (38 to 89) and mean body mass index 29.87 kg/m2 (17 to 62). The mean follow-up was ten years (4 to 11).


RESULTS
Survivorship of the Oxford UKA at ten years was 88%, using life table analysis. Implant survivorship at ten years was 95%. The most common cause for revision was the progression of osteoarthritis in the lateral compartment. The mean knee score element of the American Knee Society Score (AKSS) was 50 pre-operatively and increased to 93 post-operatively. The mean AKSS function score was 56 pre-operatively rising to 78 post-operatively CONCLUSION: This ten-year follow-up study of the Oxford UKA undertaken in the United States shows good survivorship and excellent function in a wide selection of patients with AMOA and AVN. Cite this article: Bone Joint J 2016;98-B(10 Suppl B):34-40.
Texas Center for Joint Replacement, 6020 W. Parker Road Suite 470 Plano, Texas 75093, USA.
R H
RH
Emerson
Texas Center for Joint Replacement, 6020 W. Parker Road Suite 470 Plano, Texas 75093, USA.
O
O
Alnachoukati
Plano Orthopedic Sports Medicine and Spine Center, 5228 W Plano Pkwy, Plano, TX 75093, USA.
J
J
Barrington
Texas Center for Joint Replacement, 6020 W. Parker Road Suite 470 Plano, Texas 75093, USA.
K
K
Ennin
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007720:Knee Prosthesis; D015993:Life Tables; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012042:Registries; D012086:Reoperation / Q000706:statistics & numerical data; D012189:Retrospective Studies; D012720:Severity of Illness Index; D016019:Survival Analysis; D013781:Texas; D016896:Treatment Outcome
10-year Survivorship; Oxford Partial Knee System; Unicompartmental Knee Arthroplasty
Orthopedics. 2011 Sep 09;34(9):e578-80
21902161
J Arthroplasty. 2011 Feb;26(2):192-7
20667688
J Bone Joint Surg Br. 1991 Jul;73(4):582-6
2071640
J Bone Joint Surg Br. 2001 Mar;83(2):191-4
11284563
J Bone Joint Surg Am. 2016 Jan 6;98(1):1-8
26738897
J Arthroplasty. 2013 Oct;28(9 Suppl):195-8
23796556
Knee Surg Sports Traumatol Arthrosc. 2007 Nov;15(11):1331-4
17684726
J Bone Joint Surg Br. 2010 Mar;92(3):367-73
20190307
Acta Orthop Belg. 2012 Apr;78(2):203-9
22696991
Clin Orthop Relat Res. 2011 Jan;469(1):174-9
20706811
Sports Med Arthrosc Rehabil Ther Technol. 2012 Feb 21;4:8
22353541
Isr Med Assoc J. 2009 May;11(5):266-8
19637502
Int Orthop. 2010 Dec;34(8):1137-43
19838707
Br J Cancer. 1977 Jan;35(1):1-39
831755
Knee. 2014 Mar;21(2):617-9
24231622
Bone Joint J. 2015 Nov;97-B(11):1493-500
26530651
J Bone Joint Surg Br. 1993 Sep;75(5):697-704
8376423
J Orthop Sci. 2013 Jul;18(4):679-82
22237971
J Arthroplasty. 2015 Mar;30(3):475-8
25453627
Clin Orthop Relat Res. 1989 Nov;(248):13-4
2805470
J Bone Joint Surg Br. 2004 Sep;86(7):983-5
15446523
J Bone Joint Surg Am. 1989 Jan;71(1):145-50
2643607
J Bone Joint Surg Br. 2012 Aug;94(8):1071-6
22844048
J Arthroplasty. 2013 Oct;28(9 Suppl):168-71
24099572
Knee. 2013 Dec;20(6):461-5
23110877
Clin Orthop Relat Res. 1996 Oct;(331):74-80
8895621
Clin Orthop Surg. 2015 Jun;7(2):199-206
26217466
Knee Surg Sports Traumatol Arthrosc. 2016 Mar 26;:null
27017212
J Thromb Haemost. 2010 Sep;8(9):1895-902
20586922
Clin Orthop Relat Res. 2009 Jun;467(6):1450-7
19225852
J Bone Joint Surg Br. 2011 Feb;93(2):198-204
21282759
J Bone Joint Surg Br. 1978 Aug;60-B(3):358-69
581081
Knee Surg Sports Traumatol Arthrosc. 2010 Jul;18(7):898-900
20076944
J Arthroplasty. 2008 Sep;23(6):931-3
18534524
J Bone Joint Surg Br. 2005 Nov;87(11):1488-92
16260664