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- Title
Knee kinematics in medial osteoarthritis during in vivo weight-bearing activities.
- Authors
Hamai, Satoshi; Moro-oka, Taka-aki; Miura, Hiromasa; Shimoto, Takeshi; Higaki, Hidehiko; Fregly, Benjamin J.; Iwamoto, Yukihide; Banks, Scott A.
- Abstract
Dynamic knee kinematics were analyzed for medial osteoarthritic (OA) knees in three activities, including two types of maximum knee flexion. Continuous x-ray images of kneeling, squatting, and stair climbing motions were taken using a large flat panel detector. CT-derived bone models were used for the model registration-based 3D kinematic measurements. Three-dimensional joint kinematics and contact locations were determined using two methods: bone-fixed coordinate systems and by interrogation of CT-based bone model surfaces. The femur exhibited gradual external rotation with knee flexion for kneeling and squatting activities, and gradual internal rotation with knee extension for stair climbing. From 100° to 120° flexion, contact locations showed a medial pivot pattern similar to normal knees. However, knees with medial OA displayed a femoral internal rotation bias and less posterior translation when compared with normal knees. A classic screw-home movement was not observed in OA knees near extension. Decreased variability with both activities and methods of calculation were demonstrated for all three activities. In conclusion, the weight-bearing kinematics of patients with medial OA differs from normal knees. Pathological changes of the articulating surfaces and the ligaments correspond to observed abnormalities in knee kinematics. © 2009 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 27:1555-1561, 2009
- Subjects
ORTHOPEDICS; KINEMATICS; OSTEOARTHRITIS; KNEE; HUMAN mechanics
- Publication
Journal of Orthopaedic Research, 2009, Vol 27, Issue 12, p1555
- ISSN
0736-0266
- Publication type
Article
- DOI
10.1002/jor.20928