TY - JOUR
T1 - Intraoperative evaluation of total knee replacement
T2 - Kinematic assessment with a navigation system
AU - Casino, Daniela
AU - Zaffagnini, Stefano
AU - Martelli, Sandra
AU - Lopomo, Nicola
AU - Bignozzi, Simone
AU - Iacono, Francesco
AU - Russo, Alessandro
AU - Marcacci, Maurilio
PY - 2009/4
Y1 - 2009/4
N2 - Interest in the kinematics of reconstructed knees has increased since it was shown that the alteration of knee motion could lead to abnormal wear and damage to soft tissues. We performed intraoperative kinematic measurements using a navigation system to study knee kinematics before and after posterior substituting rotating platform total knee arthroplasty (TKA). We verified intraoperatively (1) if varus/valgus (VV) laxity and anterior/posterior (AP) laxity were restored after TKA; (2) if TKA induced abnormal femoral rollback; and (3) how tibial axial rotation was influenced by TKA throughout the range of flexion. We found that TKA improved alignment in preoperative osteoarthritic varus knees which became neutral after surgery and maintained a neutral alignment in neutral knees. The VV stability at 0° was restored while AP laxity at 90° significantly increased after TKA. Following TKA, the femur had an abnormal anterior translation up to 60° of flexion, followed by a small rollback of 12 ± 5 mm. TKA influenced the tibia rotation pattern during flexion, but not the total amount of internal/external rotation throughout whole range of flexion, which was preserved after TKA (6° ± 5°). This study showed that the protocol proposed might be useful to adjust knee stability at time zero and that knee kinematic outcome during total knee replacement can be monitored by a navigation system.
AB - Interest in the kinematics of reconstructed knees has increased since it was shown that the alteration of knee motion could lead to abnormal wear and damage to soft tissues. We performed intraoperative kinematic measurements using a navigation system to study knee kinematics before and after posterior substituting rotating platform total knee arthroplasty (TKA). We verified intraoperatively (1) if varus/valgus (VV) laxity and anterior/posterior (AP) laxity were restored after TKA; (2) if TKA induced abnormal femoral rollback; and (3) how tibial axial rotation was influenced by TKA throughout the range of flexion. We found that TKA improved alignment in preoperative osteoarthritic varus knees which became neutral after surgery and maintained a neutral alignment in neutral knees. The VV stability at 0° was restored while AP laxity at 90° significantly increased after TKA. Following TKA, the femur had an abnormal anterior translation up to 60° of flexion, followed by a small rollback of 12 ± 5 mm. TKA influenced the tibia rotation pattern during flexion, but not the total amount of internal/external rotation throughout whole range of flexion, which was preserved after TKA (6° ± 5°). This study showed that the protocol proposed might be useful to adjust knee stability at time zero and that knee kinematic outcome during total knee replacement can be monitored by a navigation system.
KW - Computer-assisted surgery
KW - Femoral rollback
KW - Knee osteoarthritis
KW - Knee replacement
KW - Tibial rotation
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U2 - 10.1007/s00167-008-0699-3
DO - 10.1007/s00167-008-0699-3
M3 - Article
C2 - 19099289
AN - SCOPUS:63949084019
VL - 17
SP - 369
EP - 373
JO - Knee Surgery, Sports Traumatology, Arthroscopy
JF - Knee Surgery, Sports Traumatology, Arthroscopy
SN - 0942-2056
IS - 4
ER -