Knee Joint Thrust During the Early Stance Pahse of Gait Cycle

This paper is performed to evaluate with the knee joint motion of the active flexion (without weight bearing motion) and of the early stance phase during gait cycle (with weight bearing motion) by using a three-dimensional knee motion analysis system and the biomechanical pathogenesis of osteoarthritic knee is also discussed. Assessments were practiced about the knee motion of eighteen female patients with osteoarthritic knees; the controls were sixty-five volunteers of the adult healthy group including thirty-four males and thirty-one females. Typical motion patterns of active flexion and of early stance phase during gait cycle were evaluated to detect the difference based on osteoarthritis levels and gender. In results of this study, changes of adduction and internal rotation were appeared in the knee motion pattern during active flexion and early stance phase during gait cycle. During the active flexion, the mean values of adduction angle during flexion were 0.38±0.22 degrees in male group(MG), O.18±0.28 degrees in female group(FG) and 0.29±0.21 degrees in osteoarthritic knee group(OAG). On the other hand, in the early stance phase, the mean values of adduction angle during flexion were 0.29±0.21 degrees in MG, and were 0.29±0.27 degrees in FG and 0.87±0.48 degrees in OAG. During weight bearing motion of OAG, adduction angles increased to 0.58 degrees in the osteoarthritic knee, remarkably, that should mean as a phenomenon of the knee thrust. The thrust of OAG might be related to the joint laxity, deterioration of power in the quadriceps femoris muscle, the problem of their body weight and of aging. In the present study, the biomechanical pathogenesis of an osteoarthritic knee would be discussed about factors of osteoarthritic knee and be presented a few sources of knee osteoarthritis of femal quantitatively

Biomenchanical Analysis on the pathogenesis of Knee Osteoarthrosis

The three-dimensional knee joint motion data during level walking were obtained from 34 males and 33 females using a 6-degree-of-freedom electrogoniometer. Normal motion pattern of active flexion (full extension to 20deg. flex.), active extension (20deg. flex. to full extension) and early stance phase during gait cycle were evaluated to find the physical difference based on sex and age. Adduction and internal rotation (male 85.3%, female 66.7%) were shown in the normal motion pattern during active flexion of the knees while abduction and external rotation (male 91.2%, female 90.9%) were found in the pattern during active extension of the knees.The screw home motion is detected during active extension (male 61.8%, female 90.9%). Adduction and internal rotation (male 97.1%, female 81.8%) were shown in the normal motion pattern during early stance phase. Females tend to change the pattern of motion with weight bearing. Adduction at early stance phase and abduction under active flexion are shown in females by 12.9%. On the other hand, there is the pattern change by only 2.9%, in males. This gender difference seems to be related to a general tendency of joint laxity in f emales