2 doctors weighed in:

Please explain why is relaxation of the quadriceps muscle critical to obtaining 90 degrees of flexion from lightly restricted 50 to 60 degrees of flexion?

2 doctors weighed in
Dr. Peter Ihle
Orthopedic Surgery
1 doctor agrees

In brief: It's because the--

-quad contracts as U try to Flex.
U need 2 block it out of the equation. My trick was 2 have U sit on a couch cushion that U pull out so when U flex, U squeeze the cushion with Ur hams. Do this & U will see the quad doesn't contract. Another way is 2 sit on the couch and drag Ur heel toward U with hard downward force as if trying 2 make a trench. This also will stop the quad from contracting,

In brief: It's because the--

-quad contracts as U try to Flex.
U need 2 block it out of the equation. My trick was 2 have U sit on a couch cushion that U pull out so when U flex, U squeeze the cushion with Ur hams. Do this & U will see the quad doesn't contract. Another way is 2 sit on the couch and drag Ur heel toward U with hard downward force as if trying 2 make a trench. This also will stop the quad from contracting,
Dr. Peter Ihle
Dr. Peter Ihle
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