have the patient lie supine and attempt to bring the heel as close to the buttocks as possible
The normal response
the patient should be able to bring the heel all the way to the buttock, or at least have the posterior calf abut the posterior thigh
What it means if not normal
the joint is not normal--but note that the body tolerates some loss of flexion quite easily. if one could flex to 110 degrees, most activities of daily living are not impeded
Comments
pain, especially from a posterior horn meniscal tear, may inhibit full flexion