5.2.1 User Manual Isoforce
REV 5
01st July 2014
page 56 von 77
TUR Therapietechnik GmbH | Grubenstr. 20 | 18055 Rostock | Germany
3.5 Elbow
The elbow joint occurs at the junction the humerus or upper arm bone, the ulna which is the larger of
the two forearm bones and the radius bone. The humerus forms the upper part of the joint and widens
near the end to form the medial and lateral epicondyles which are the two bony processes felt either
side of the elbow joint.
The ulna is situated on the inside of the joint and forms a cup shape which allows articulation with the
humerus. The radius is the smaller of the two forearm bones and sits on the outside of the joint. The
radial head is round and again cup-shaped to allow it to move around the wide base known as the
capitulum of the humerus.
There are actually three joints at the elbow. The first being the hinge joint formed between the humerus
and the ulna called the humeroulnar joint, which allows us to bend and straighten our elbows.
The second is the humeroradial joint between the radius and humerus which again allows flexion and
extension but is also involved in the more complex motion of turning the hand over so the palm faces
up or down. This movement of the forearm is called supination (palm up) and pronation (palm down).
The third is a pivot joint formed by the radius and ulna and is called the proximal radioulna joint.
3.5.1 Elbow Extension – Flexion
Rotation Axis:
.
Approximately
1 cm above the lateral epicondyle
Anatomical Zero: Straight Arm
Range of Motion: Up to 150 degreed flexion
Isoforce offers one positioning possibility, in supine position.
Muscles Involved: Brachialis and brachioradialis
