Adduction moment of the knee compared to radiological and clinical parameters in moderate medical osteoarthrosis of the knee.
The purpose of this study was to investigate the relationship between clinical symptoms, static radiographic measurements, and of load distribution during walking at the knee, in 54 patients with moderate medial osteoarthrosis of the knee. Varus deformity of the knee was assessed from static radiographic measurements as the Hip-Knee-Ankle (HKA) angle, and range of moments at the knee in the frontal plane were assessed using a Kistler force plate system. No correlations between clinical symptoms and radiographic parameters or moments at the knee were found. The adduction moment in mid stance was more important than the peak adduction moment in differentiating between patients and normal controls. The amplitude of the peak adduction moment depended on the sex and body mass of the patients, while the amplitude of the mid stance adduction moment depended on body mass and the varus deformity of the knee. There was a weak correlation between the peak adduction moment and the HKA-angle (r = 0.32, P < 0.05) and there was a moderately high correlation between the peak adduction moment in mid stance, i.e 50% of the stance phase, and the HKA angle (r = 0.46, P < 0.001) even after normalization of the mid stance moment to body mass. Accordingly, 20% of the medio-lateral knee load in mid stance during walking could be explained by the varus deformity of the osteoarthrotic knee in our patients.
Department of Orthopaedics, St Görans Hospital, Stockholm, Sweden.
L
L
Weidenhielm
O K
OK
Svensson
L A
LA
Broström
E
E
Mattsson
D015992:Body Mass Index; D005260:Female; D005684:Gait / Q000502:physiology; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000000981:diagnostic imaging / Q000503:physiopathology*; D010147:Pain Measurement; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology; D016474:Weight-Bearing / Q000502:physiology