Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Navigation
Abstract number: 25832
EVALUATION OF 320 COMPUTER-ASSISTED TOTAL KNEE REPLACEMENT
PROCEDURES
Ignacio GARCÍA-FORCADA, Jaume CALMET-GARCÍA, Eduardo GONZÁLEZ-
PEDROUZO, Joseé GINÉ-GOMÀ, Carlos ESTEVE-BALZOLA, Ainhoa GORDILLO-
SANTESTEBAN
Hospital Universitari de Tarragona Joan XXIII, Tarragona (SPAIN)
Introduction: Our objective when we do a total knee replacement (TKR) is to obtain a
correct mechanical axis (0 +/-3º). We have performed a prospective study about
primary TKR-procedures assisted by computer in order to know immediate
postoperative results. Material and methods: We have implanted at our hospital 320
prostheses Search- Evolution and Columbus (B/Braun Aesculap, Tuttlingen,
Germany), assisted by the surgical navigator Orthopilot (B/Braun Aesculap,
Tuttlingen, Germany), from March 2003 until January 2009. We communicate our
data about our patients and the pre and postoperative mechanical axis obtained
(calculated by the Navigator before the bone was cut and after the prosthesis was
implanted). Results: Our series is composed of 227 women and 93 men, median age
70 years (range 34-86). Median preoperative deformity: 173.7º (range 161º-194º). In
seven surgical procedures, navigation was aborted due to technical problems. In the
remaining 313 TKR, 309 (98.7%) showed a mechanical axis at the end of the
procedure of 180 +/- 3º, and we regarded 4 (1.3%) as outliers, with values of
mechanical axis of 184º and 185º (4º, 4ºand 5º valgus and 4º varus respectively).
Comments and conclusions: 1) Surgical navigation in TKR has allowed us to achieve
a correct mechanical axis in 309 out of 313 procedures 2) The four cases qualified as
outliers present a 4º varus deviation and 4º, 4º and 5º valgus deviation. 3). We think
that surgical navigation is an extremely useful advance in TKR.
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