Abstract

BONIFACIO, Juan Pablo; COSTA PAZ, Matías; YACUZZI, Carlos H  and  CARBO, Lisandro. Rango de movilidad y resultados funcionales en tres diseños diferentes de artroplastia de rodilla primaria: Estudio comparativo. Rev. Asoc. Argent. Ortop. Traumatol. [online]. 2016, vol.81, n.4, pp.264-272. ISSN 1852-7434.

Introduction: The purpose of this comparative study was to analyze functional results and the range of motion of the knee among three groups of patients with total knee arthroplasty using high-flex prosthesis (in two groups) and a conventional design (one group). Methods: Sixty-four patients were surgically treated with total knee arthroplasty using a Zimmer® NexGen® prosthesis, and 34 patients received a high-flex Optetrack® design. After exclusion of patients, 22 patients (group A) were treated with a high-flex Zimmer® NexGen® design, 21 patients (group B) were treated with a conventional implant, and 25 patients (group C) received a high-flex PS Optetrack® prosthesis. Functional evaluation was performed with the Knee Society Score, the Western Ontario and McMaster Universities Osteoarthritis index, and a visual analogue scale. Results: Mean post-surgical maximum flexion increased from 99° to 113º in group A, with an average increase of 14º, from 106° to 118º in group B, with an average gain of 12º, and from 110 to 111° in group C, with an average increase of 1°. Functional results assessed with both scores showed improvements in all three groups. Conclusions: The functional and radiographic outcomes were favorable in the three designs. This study suggests that there are no significant differences in the final flexion and functional outcomes between the first two designs; however together they are significantly superior to the third group after one year of follow-up.

Keywords : Total knee arthroplasty; High flexion arthroplasty; Conventional arthroplasty; Range of motion.

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