Clin Orthop Relat Res 2008 Oct 13;466(10):2491-9. Epub 2008 Aug 13.
Department of Bioengineering, Imperial College London, London, UK.
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Zhonghua Wai Ke Za Zhi 2007 Jun;45(12):839-42
Department of Orthopaedics, the Third Hospital of Hebei Medical University, Shijiazhuang 050051, China.
Objective: To compare the effects of increased posterior tibial slope or partial posterior cruciate ligament (PCL) release on knee kinematics of total knee arthroplasty (TKA).
Methods: Anteroposterior laxity, rotational laxity, varus and valgus laxity and maximum flexion angle were evaluated in 6 normal cadaver knees and the knees after TKA at flexion 0 degrees , 30 degrees , 60 degrees , 90 degrees and 120 degrees . Then the femoral prosthesis was shifted 5 mm posteriorly to simulate the tightly implanted knee. Read More
Bull Hosp Jt Dis 1998 ;57(4):195-201
Department of Orthopaedic Surgery, Gifu University School of Medicine, Japan.
To increase the range of motion in the knee, posterior cruciate ligament-retaining total knee arthroplasty (TKA), which has a roll back (RB) mechanism, is used. The roll back mechanism is the complex movement of the femoral condyles relative to the tibial plateau, which results in translation of the tibiofemoral contact point posteriorly as the knee is flexed. This study was undertaken to assess the function of the posterior cruciate ligament (PCL) and posterior tibial tilt following PCL-retaining TKA. Read More
J Orthop Res 2007 Nov;25(11):1506-12
Fremantle Orthopaedic Unit, The University of Western Australia, Fremantle, Australia 6160.
Despite ongoing evolution in total knee arthroplasty (TKA) prosthesis design, restricted flexion continues to be common postoperatively. Compressive tibiofemoral force during flexion is generated through the interaction between soft tissues and prosthesis geometry. In this study, we compared the compressive tibiofemoral force in vitro of four commonly used prostheses: fixed-bearing PCL (posterior cruciate ligament)-retaining (PFC), mobile-bearing posterior-stabilized (PS), posterior-stabilized with a High Flex femoral component (HF), and mobile-bearing PCL-sacrificing (LCS). Read More
J Orthop Res 2013 Jan 13;31(1):53-8. Epub 2012 Jun 13.
Biomechanics Group, Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, United Kingdom.
There continues to be some dissatisfaction with the function of total knee arthroplasties (TKA). "Mid-range instability" has been linked to multi-radius femoral components allowing transient ligament slackness and instability during knee flexion. Single-radius designs have been introduced to avoid this. Read More