Ten- to 15-year results of the Oxford Phase III mobile unicompartmental knee arthroplasty: a prospective study from a non-designer group.
The interest in unicompartmental knee arthroplasty (UKA) for medial osteoarthritis has increased rapidly but the long-term follow-up of the Oxford UKAs has yet to be analysed in non-designer centres. We have examined our ten- to 15-year clinical and radiological follow-up data for the Oxford Phase III UKAs.



Between January 1999 and January 2005 a total of 138 consecutive Oxford Phase III arthroplasties were performed by a single surgeon in 129 patients for medial compartment osteoarthritis (71 right and 67 left knees, mean age 72.0 years (47 to 91), mean body mass index 28.2 (20.7 to 52.2)). Both clinical data and radiographs were prospectively recorded and obtained at intervals. Of the 129 patients, 32 patients (32 knees) died, ten patients (12 knees) were not able to take part in the final clinical and radiological assessment due to physical and mental conditions, but via telephone interview it was confirmed that none of these ten patients (12 knees) had a revision of the knee arthroplasty. One patient (two knees) was lost to follow-up.



The mean follow-up was 11.7 years (10 to 15). A total of 11 knees (8%) were revised. The survival at 15 years with revision for any reason as the endpoint was 90.6% (95% confidence interval (CI) 85.2 to 96.0) and revision related to the prosthesis was 99.3% (95% CI 97.9 to 100). The mean total Knee Society Score was 47 (0 to 80) pre-operatively and 81 (30 to 100) at latest follow-up. The mean Oxford Knee Score was 19 (12 to 40) pre-operatively and 42 (28 to 55) at final follow-up. Radiolucency beneath the tibial component occurred in 22 of 81 prostheses (27.2%) without evidence of loosening.



This study supports the use of UKA in medial compartment osteoarthritis with excellent long-term functional and radiological outcomes with an excellent 15-year survival rate. Cite this article: Bone Joint J 2016;98-B(10 Suppl B):41-7.
BovenIJ Hospital, Statenjachtstraat 1, 1034 CS Amsterdam, The Netherlands.
L A
LA
Lisowski
BovenIJ Hospital, Statenjachtstraat 1, 1034 CS Amsterdam, The Netherlands.
L I
LI
Meijer
OLVG Oost, Oosterpark 9, 1091 AC Amsterdam, The Netherlands.
M P J
MP
van den Bekerom
Reinier de Graaf Gasthuis, Reinier de Graafweg 5, 2625 AD, Delft, The Netherlands.
P
P
Pilot
Reinaert Kliniek, Brouwerseweg 100 C 02, 6216 EG, Maastricht, The Netherlands.
A E
AE
Lisowski
D000368:Aged; D000369:Aged, 80 and over; D001175:Arthrography; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D053208:Kaplan-Meier Estimate; D007719:Knee Joint / Q000000981:diagnostic imaging; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging / Q000601:surgery*; D011446:Prospective Studies; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012086:Reoperation / Q000706:statistics & numerical data; D012720:Severity of Illness Index; D016896:Treatment Outcome
Knee; Long-term outcome; Minimally invasive surgical technique; Non-designer; Unicompartmental
J South Orthop Assoc. 1999 Spring;8(1):20-7; discussion 27
12132848
Int Orthop. 2007 Jun;31(3):321-4
16896865
Int Orthop. 2013 May;37(5):833-8
23503637
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
Knee. 2010 Dec;17(6):392-7
19919897
J Bone Joint Surg Br. 2004 Jan;86(1):43-7
14765864
J Bone Joint Surg Br. 2011 Apr;93(4):476-8
21464485
J Bone Joint Surg Br. 2010 Mar;92(3):367-73
20190307
Knee Surg Sports Traumatol Arthrosc. 2011 Feb;19(2):277-84
20640402
JAMA. 2001 Jul 11;286(2):188-95
11448282
J Bone Joint Surg Br. 1984 Aug;66(4):523-8
6746686
Int Orthop. 2009 Dec;33(6):1585-90
19219432
J Bone Joint Surg Br. 2009 Feb;91(2):185-9
19190051
Br J Cancer. 1977 Jan;35(1):1-39
831755
J Bone Joint Surg Am. 2008 Jan;90(1):118-22
18171965
J Orthop Surg (Hong Kong). 2005 Dec;13(3):280-4
16365492
Acta Orthop. 2005 Jun;76(3):347-52
16156462
Bone Joint J. 2015 Nov;97-B(11):1506-11
26530653
Bone Joint J. 2015 Nov;97-B(11):1493-500
26530651
J Orthop Surg (Hong Kong). 2012 Aug;20(2):157-61
22933670
J Bone Joint Surg Br. 2006 Jan;88(1):54-60
16365121
J Arthroplasty. 2013 Sep;28(8 Suppl):116-9
23954423
J Bone Joint Surg Br. 2007 Dec;89(12 ):1602-7
18057360
Clin Orthop Relat Res. 1989 Nov;(248):13-4
2805470
J Arthroplasty. 2001 Dec;16(8):970-6
11740750
J Bone Joint Surg Br. 1998 Nov;80(6):983-9
9853489
J Bone Joint Surg Br. 2004 Sep;86(7):983-5
15446523
J Bone Joint Surg Br. 1999 Sep;81(5):783-9
10530837
Clin Orthop Surg. 2015 Jun;7(2):199-206
26217466
Knee. 2004 Oct;11(5):389-94
15351415
Clin Orthop Relat Res. 2013 Nov;471(11):3565-71
23836243
J Bone Joint Surg Br. 1988 Nov;70(5):692-701
3192563
Clin Orthop Relat Res. 2005 Jun;(435):171-80
15930935
J Bone Joint Surg Br. 2009 Jul;91(7):896-902
19567853
J Knee Surg. 2002 Fall;15(4):240-6
12416907
J Rheumatol. 1988 Dec;15(12):1833-40
3068365
Clin Orthop Relat Res. 2009 Jun;467(6):1450-7
19225852
Acta Orthop. 2007 Feb;78(1):128-35
17453404
Knee. 2007 Aug;14(4):275-9
17524650
J Bone Joint Surg Br. 2005 Nov;87(11):1488-92
16260664
Bone Joint J. 2014 Nov;96-B(11 Supple A):7-9
25381400
Acta Orthop Scand. 1992 Oct;63(5):497-501
1441942
J Bone Joint Surg Br. 1998 Jan;80(1):63-9
9460955