TY - JOUR
T1 - Femoral rollback of cruciate-retaining and posterior-stabilized total knee replacements
T2 - In vivo fluoroscopic analysis during activities of daily living
AU - Fantozzi, Silvia
AU - Catani, Fabio
AU - Ensini, Andrea
AU - Leardini, Alberto
AU - Giannini, Sandro
PY - 2006/12
Y1 - 2006/12
N2 - Restoration of the physiological flexor/extensor mechanism at the knee in terms of appropriate muscular lever arms, proper required quadriceps force, and suitable patellofemoral compressive force, is fundamental for the success of total knee replacement. Therefore, measurements of anteroposterior translation of the femoral component over the tibial base-plate against joint flexion during daily living activities are essential for the assessment of the in vivo performance of current prosthesis designs. Patients treated with posterior stabilized and cruciate retaining prostheses with excellent clinical scores were evaluated during stair climbing, sitting and rising from a chair, and step up and down, using a three-dimensional pose reconstruction technique based on videofluoroscopy. The posterior stabilized patients experienced a fairly consistent and physiological rollback specific of each motor task, demonstrating proper function of the spine-cam mechanism. Rollback was somehow inconsistent among subjects in the cruciate retaining group, accompanied with a smaller range of knee flexion. In this group, more posterior locations of the condyles correlated significantly with higher clinical and functional scores. Articular surface conformity restores physiological rollback in the presence of a spine-cam mechanism, but not coherently in the presence of the posterior cruciate ligament.
AB - Restoration of the physiological flexor/extensor mechanism at the knee in terms of appropriate muscular lever arms, proper required quadriceps force, and suitable patellofemoral compressive force, is fundamental for the success of total knee replacement. Therefore, measurements of anteroposterior translation of the femoral component over the tibial base-plate against joint flexion during daily living activities are essential for the assessment of the in vivo performance of current prosthesis designs. Patients treated with posterior stabilized and cruciate retaining prostheses with excellent clinical scores were evaluated during stair climbing, sitting and rising from a chair, and step up and down, using a three-dimensional pose reconstruction technique based on videofluoroscopy. The posterior stabilized patients experienced a fairly consistent and physiological rollback specific of each motor task, demonstrating proper function of the spine-cam mechanism. Rollback was somehow inconsistent among subjects in the cruciate retaining group, accompanied with a smaller range of knee flexion. In this group, more posterior locations of the condyles correlated significantly with higher clinical and functional scores. Articular surface conformity restores physiological rollback in the presence of a spine-cam mechanism, but not coherently in the presence of the posterior cruciate ligament.
KW - Cruciate retaining
KW - Femoral roll back
KW - Fluoroscopy analysis
KW - Posterior stabilized
KW - Total knee replacement
UR - http://www.scopus.com/inward/record.url?scp=33845909035&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33845909035&partnerID=8YFLogxK
U2 - 10.1002/jor.20306
DO - 10.1002/jor.20306
M3 - Article
C2 - 17019683
AN - SCOPUS:33845909035
VL - 24
SP - 2222
EP - 2229
JO - Journal of Orthopaedic Research
JF - Journal of Orthopaedic Research
SN - 0736-0266
IS - 12
ER -