Bruni D., MD; Gagliardi M.,MD; Raspugli G.,MD; Grassi A., MD; Marko T.,MD; Akkawi I.,MD; Prof. Marcacci M.,MD. Rizzoli Orthopaedic Institute – Bologna,

UNICOMPARTMENTAL KNEE REPLACEMENT WITH AN ALL-POLY TIBIAL COMPONENT:

SATISFACTORY 10-YEARS IMPLANTSURVIVORSHIP REGARDLESS FROM BMI.

Bruni D., MD; Gagliardi M.,MD; Raspugli G.,MD; Grassi A., MD; Marko T.,MD; Akkawi I.,MD; Prof. Marcacci M.,MD.

Rizzoli Orthopaedic Institute – Bologna, Italy

UKA with all-poly tibial component:

When using it?

Metal-Backed or All poly?

Which survival?

Which % of failure?

Which are most important causes of failure?

literature is not UNIQUE !!!

Purposes of the study

1) perform a long-term survival analysis of a large sample of patients treated with UKA with 'all-poly“ tibial component

2) To evaluate the effect of BMI on the incidence of failure of the prosthesis.

Materials and Methods

280 consecutive patients treated with all-poly UKA

Average age: 68 years (53-84) 7pt lost at FU Average BMI 28.2 (23-38)

Indications for treatment:187 OA

89 ON

Evaluations:

Clinical: BMI ,VAS, KSS[1] & WOMAC[2]

scores

Radiographic: Tibio-femoral angle(FTA); Posterior tibial slope (TPS); Tibial plateau angle (TPA)

Average Follow Up: 10 years (7-13) [1] Insall JN, Dorr LD, Scott RD, Scott WN. Rationale of the Knee Society clinical rating system. Clin Orthop Relat Res. 1989 Nov;(248):13-4.

 [2] Roos EM, Roos HP, Lohmander LS, Ekdahl C, Beynnon BD. Knee Injury and Osteoarthritis Outcome Score (KOOS)--development of a self-administered outcome measure. J Orthop Sports Phys Ther. 1998 Aug;28(2):88-96.

Clinical results:

Results: survival

Survival at 10 years:87.6%

Survival at 5 years:90,8%

Other evaluations:

Differences were not statistically significant

Other Clinical and radiographic evaluations:

Discussion: literature vs present study

Survival:

No. of revisions:

Causes of failure:

BMI influence:

From 85% to 100% at 5-10 years of follow-up 87,6% at 10aa

Highly variable until 87% at 5y 9,2%of revised patients in a 134 months FU study

«Medial tibial collapse» as 1° cause Aseptic loosening as 1° cause

Poor Outcome with BMI >35 No SS differences for patients with BMI>30

PRESENT STUDY

Conclusions: UKA with all-poly tibial component

1) Satisfactory survival at more than 10 years of follow up of a large sample of patients with satisfactory clinical and functional outcomes.

2) BMI> 30 have no effect on the incidence of revision

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