5.2.1 User Manual Isoforce
REV 5
01st July 2014
page 28 von 77
TUR Therapietechnik GmbH | Grubenstr. 20 | 18055 Rostock | Germany
3.1 Ankle
The
ankle
is
a
complex
joint.
What
we
normally
think
of
as
the
ankle
is actually made up of two joints: the subtalar joint, and the true ankle joint. The true ankle joint is
composed of 3 bones, seen above from a front, or anterior, view: the tibia which forms the inside, or
medial, portion of the ankle; the fibula which forms the lateral or outside portion of the ankle; and the
talus underneath. The true ankle joint is responsible for up and down motion of the foot.
Beneath the true ankle joint is the second part of the ankle, the subtalar joint, which consists of the talus
on top and calcaneus on the bottom. The subtalar joint allows side to side motion of the foot.
The ends of the bones in these joints are covered by articular cartilage. The major ligaments of the
ankle are: the anterior tibiofibular ligament, which connects the tibia to the fibula; the lateral collateral
ligaments, which attach the fibula to the calcaneus and gives the ankle lateral stability; and, on the
medial side of the ankle, the deltoid ligaments, which connect the tibia to the talus and calcaneus and
provide medial stability.
These components of your ankle, along with the muscles and tendons of your lower leg, work together
to handle the stress your ankle receives as you walk, run and jump.
3.1.1 PlantarFlexion/DorsiFlexion
Rotation Axis: It
passes through the malleoli.
Anatomical Zero: In neutral position. To be sure that you set it correctly ask your subject to stand
without wearing shoes and make a measurement with goniometer defining the angle the tibia forms to
the foot taking the malleoli as the center of the angle. Reproduce the angle after the subject is
positioned and stabilizes on isoforce.
Range of Motion: 25 degrees for dorsiflexion, 50 degrees for plantarflexion,
Isoforce offers two positioning possibilities, one in prone position, that can also be modified to seated
and one in supine.
