Knee Muscle Forces Research Articles

A comparison of knee joint and muscle forces in women 36 weeks pregnant and four weeks after delivery.

Knee joint and muscle forces were determined for three women when they were 36 weeks pregnant and again four weeks after delivery, for the activity of rising from a seated position. The knee joint forces were determined by kinesiological techniques using a high speed cine camera, a force platform, a specially constructed dynamometerized chair, and emg recorders. A comparison of knee joint and muscle forces was made for rising from a normal chair both with and without the aid of arms for the same three women Before Childbirth (b.c.) and After Delivery (a.d.). For rising from the seated position without the aid of arms, the knee joint forces parallel to the long axis of the tibia at the point of contact between the tibia and the femur, were found to be 33 per cent greater b.c. compared to those a.d. Other knee joint and muscle forces were also dramatically increased due to pregnancy.

Forces in the knee joint whilst rising from a seated position

Knee joint forces were determined by kinesiological techniques, using a high speed cine camera, a force platform, a specially constructed dynamometerized chair, and EMG recorders; so that a comparison could be made for rising from a normal chair with and without the aid of arms, and for rising from high and low chairs. For rising from the seated position, the knee joint forces parallel to the long axis of the tibia at the point of contact between the tibia and femur were found to be up to seven times body weight at about the time when the body left contact with the chair. When rising from a chair with the aid of arms, the knee joint forces were reduced to less than three times body weight. Knee joint and muscle forces were also reduced when rising from a high seat compared with rising from a low seat.

Prediction of distal extremity motion following relaxation of knee muscle forces

Prediction of distal extremity motion following relaxation of knee muscle forces