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Light leg press
1%
41/3010
Use of a stair climbing machine
3%
81/3010
Vertical squat with light dumbbells in each hand
7%
211/3010
Seated leg extensions
88%
2640/3010
Use of a stationary bike
26/3010
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Open chain extension exercises, such as seated leg extensions, are generally not allowed in the first 6 weeks of rehabilitation after reconstruction of the ACL because they put increased stress on the graft. Closed kinetic chain exercises, in which the foot remains in constant contact with the ground or the base of a machine, provide a more significant compression force across the knee while activating co-contraction of the hamstring muscles. It has been suggested that these two factors help to decrease the anterior shear forces in the knee that would otherwise be taken up by the ACL graft. Choices 1,2,3, and 5 are all examples of closed kinetic chain exercises.
4.7
(30)
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