Cirugía asistida con ordenador en las artroplastias totales de rodilla. Factores relacionados con la alineación final del implante

Objective

To know the results of a total knee arthroplasty series performed with surgical navigation in frontal angulation and final rotation of the knee at both 0° and 90° of flexion and to study the influence on these results of certain factors such as body mass index, minimal invasive surgery and computer navigation software.

Material and methods

A study was carried out on a personal series of 145 total knee arthroplasty operated with a wireless system of computer assisted surgery. The results have been graded taking into account the frontal angulation of the mechanical axis and the final rotation of the limb at 0° and at 90° of flexion. The data has been collected from the computer system database. A descriptive analysis of the series has been made, also studying the influence on the final results of certain factors.

Results

The final alignment obtained in the whole series is close to the ideal situation regarding the angulation of the limb in frontal position (0° ± 3°), although a slight residual deviation in varus is appreciable (less than 1°). No differences were found in the final results in relation to the different software systems used, neither with the body mass index nor with the type of surgery (minimal invasive surgery vs standard surgery).

Conclusions

Results regarding the front mechanical axis of the knee replacements performed with surgical navigation are not changed depending on the factors studied.