1 research outputs found
Cotilos impactados vs. roscados no cementados: estudio radiol贸gico post-operatorio comparativo
Se han valorado radiograf铆as AP de pelvis obtenidas tras colocaci贸n de 102 pr贸-
tesis no cementadas en 97 pacientes: 51 eran del tipo c贸tilo roscado (CR), y 51 del tipo c贸tilo
impactado (CI). Se ha medido el 谩ngulo de inclinaci贸n, la posici贸n del cotilo, el grado de centraje,
el grado de protrusi贸n/extrusi贸n, y la superficie de contacto entre c贸tilo y la cavidad acetabular.
Globahnente los CR quedan implantados m谩s verticalmente que los CI (p=0,006), as铆 como
m谩s lateralizados (p=0,02). El porcentaje de c贸tilos bien centrados en relaci贸n al acet谩bulo es
mayor entre los CI que entre los CR (p=0,002). Un 19% de los CR quedaron parcialmente extra铆dos,
no llegando a contactar con el fondo de la cavidad acetabular, mientras que en ning煤n
caso de los CI se apreci贸 este problema. En conclusi贸n, a pesar de la te贸rica ventaja de poseer
una estabilidad inicial mayor, la orientaci贸n de los CR no resulta tan 贸ptima como la obtenida
con los CI, lo que asegura una estabilidad mejor a largo plazo y una menor usura del polietileno.鈥擯ost-operative anteroposterior radiographs of the pelvis in 102 patients receiving
a cementless total hip arthroplasty were analyzed. In a group, a screwed spherical socket
(SCR) was applied, while in other a press-fit impacted socket (IMP) was used. The following parameters
were studied: inclination angle, location and centering of the acetabular component,
degree of protrusion-extrusion, and porcentage of contact surface between the socket and the
acetabulum. SCR sockets appeared to be placed more vertically (p=0.006), and laterally
(p=0.02) than IMP prostheses. The percent of properly centered sockets was higher among
IMP than among SCR implants (p=0.002). SCR prostheses were found to be partly extruded in
19% of cases while none of the IMP prostheses had this problem. In conclussion, despite the
theoretical advantage of the SCR implants having a better initial fixation than the IMP implants,
the latter tend to be implanted in a more optimal position, thus ensuring a better longterm
stability and therefore less wear problems can be expected