Analysis of in-vivo articular cartilage contact surface of the knee during a step-up motion |
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Institution: | 1. Orthopaedic Biomechanics Laboratory, Harvard Medical School and Massachusetts General Hospital, Boston, MA 02114, USA;2. Department of Orthopaedics, Beijing Chao-Yang Hospital, China Capital Medical University, No. 8 GongTiNanLu, Chao-Yang District, Beijing 100020, PR China;3. Institute of Sports Medicine, Peking University Third Hospital, North Garden Road, Haidian District, Beijing 100191, PR China;4. Department of Orthopaedics, Chinese PLA General Hospital, No. 28 Fuxin Road, Beijing 100853, PR China;1. Department of Orthopaedic Surgery, Shanghai Jiao Tong University Affiliated Sixth People''s Hospital, 600 Yishan Road, Shanghai 200233, China;2. Bioengineering Laboratory, Department of Orthopaedic Surgery, Massachusetts General Hospital/Harvard Medical School, 55 Fruit Street, GRJ 1215, Boston, MA 02114, United States |
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Abstract: | BackgroundNumerous studies have reported on the tibiofemoral articular cartilage contact kinematics, however, no data has been reported on the articular cartilage geometry at the contact area. This study investigated the in-vivo tibiofemoral articular cartilage contact biomechanics during a dynamic step-up motion.MethodsTen healthy subjects were imaged using a validated magnetic resonance and dual fluoroscopic imaging technique during a step-up motion. Three-dimensional bone and cartilage models were constructed from the magnetic resonance images. The cartilage contact along the motion path was analyzed, including cartilage contact location and the cartilage surface geometry at the contact area.FindingsThe cartilage contact excursions were similar in anteroposterior and mediolateral directions in the medial and lateral compartments of the tibia plateau (P > 0.05). Both medial and lateral compartments were under convex (femur) to convex (tibia) contact in the sagittal plane, and under convex (femur) to concave (tibia) contact in the coronal plane. The medial tibial articular contact radius was larger than the lateral side in the sagittal plane along the motion path (P < 0.001).InterpretationsThese data revealed that both the medial and lateral compartments of the knee experienced convex (femur) to convex (tibia) contact in sagittal plane (or anteroposterior direction) during the dynamic step-up motion. These data could provide new insight into the in-vivo cartilage contact biomechanics research, and may provide guidelines for development of anatomical total knee arthroplasties that are aimed to reproduce normal knee joint kinematics. |
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