Intraoperative evaluation of total knee replacement: kinematic assessment with a navigation system |
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Authors: | Daniela Casino Stefano Zaffagnini Sandra Martelli Nicola Lopomo Simone Bignozzi Francesco Iacono Alessandro Russo Maurilio Marcacci |
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Institution: | (1) Laboratorio di Biomeccanica, Istituto Ortopedico Rizzoli, via di Barbiano, 1/10, 40136 Bologna, Italy |
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Abstract: | 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. |
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Keywords: | Knee replacement Computer-assisted surgery Tibial rotation Knee osteoarthritis Femoral rollback |
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