HandShoe Mouse: Ergonomic Mouse Backed By Ergonomic
In the past decade, the use of computers has exploded and today you'll find computers in every
company or organization and in a fast growing percentage for private use at home. Today it has also become clear
from dedicated research, that almost one in six office workers are suffering from Musculoskeletal Disorders (MSD),
including Repetitive Strain Injury (RSI) and Carpal
Research has proven that a lot of these complaints are related to the use of a conventional,
standard computer mouse.
The Erasmus University Medical Center in the Netherlands has clearly identified these problems and has also spent
several years to design and test in the field, the best and most comfortable ergonomic
On this website you'll find the research background information for the ergonomic
mouse, the proof of the studies by means of electromyogram (EMG) measurements and the best solution for
your hand: the HandShoe Mouse.
Gripping and Pinching
Studies performed by the Medical Center of Erasmus University in the Netherlands, have shown that
physical complaints, as a result of the extensive use of a conventional computer mouse, were often related to
excessive gripping and pinching of the mouse. A standard computer mouse is
simply too small for your hand, so you need to keep your hand and fingers in an unnatural gripping and
pinching position to hold on to the mouse.
Gripping and pinching may result in tension in your deep neck muscles. (see image on the
This may lead to a reduction of the space between the first rib and the clavicular bone which
could translate in pressure on nerves, arteries and veins and a restricted blood flow in your arms and hands.
Examples of complaints, caused by gripping and pinching are:
head aches radiating from the neck area
tingling feeling in arms and hands
reduced mobility of the head
loss of force in the hands
obstruction of blood flow, numb feeling
Complaints may also increase as a result of stress.
Continuous Lifting of Fingers
The Erasmus University studies have also shown that, when using a
conventional computer mouse, you are obliged to almost continuously lift the fingers above the
mouse to prevent inadvertent switching.
This may lead to over exertion of certain muscles (the extensor muscles) in your arms and hands.
As a result of this exertion, excessive tension in the deep neck muscles may occur. When these muscles are
tense they can virtually close the costoclavicular gate between the first rib and the clavicular
Another aspect addressed by professor Van Zwieten of Hasselt University in
Belgium is the highly intense use of fingers, for example with a conventional computer
mouse. This may lead to hand- or finger complaints. To understand the finger positions concerned, we analysed
some of its joints by functional anatomical research.
It appears that the functional demand of a stabilised arch of the finger will be met, by designing and
using a computer mouse that is pre-shaped to prevent disorders caused by intense use of the
In current e-learning practice, each student’s fingers, hand, and even whole upper extremity, may benefit from
ergonomically safe working conditions, thus using the computer successfully.
A statically and dynamically stabilised finger arch as is enabled
by the HandShoe Mouse is needed to prevent complaints.
(ref: publication of professors K.J. van Zwieten, K.P.Schmidt et al,
Blood vessels and nerves that pass through this gate may be pinched and the blood circulation may
thus be hampered (possibly also resulting in carpal tunnel syndrome).
Pronation of the forearm
When a (seated) person shifts his hand, palm downwards (fully pronated
forearm), to and from his body, e.g. by moving a conventional computer mouse over a desk top, the Radius
gradually crosses the Ulna. This is partially realised by contraction of the muscle Pronator Teres.
Crossing of Radius over Ulna is defined as pronation of the forearm.
Such frequent movements could result in Repetitive Strain Injury complaints. (ref:
publications Russian Scientific Practical Conference, Nov. 2008 and Health Conference St. Petersburg, Nov. 2009 of professors K.J. van
Zwieten, K.P.Schmidt et al, 2008)
So called neutral or "handshake" position
Next to the above subject, "pronation of the forearm", it is interesting to
observe the behaviour of the membrane which sits between Ulna and Radius, the two forearm bones. For example,
muscles of the forearm attach to this membrane. The membrane also transfers forces from the radius, to the ulna
and to the humerus.
In vitro studies by Professors K.J. van Zwieten, K.P.Schmidt et al,
University of Hasselt demonstrated that the use of a vertical PC-mouse in “handshake” positions should be
re-evaluated.(for publication click here)
The so called neutral or “handshake” position results in a maximally taut
membrane between Ulna and Radius. In general thumb and index finger long muscles originate from this forearm
interosseous membrane. Therefore the need to grip and pinch a vertical mouse results in unnecessary
strains in the already taut membrane and may cause physical complaints. (for publication click here)
Studies with regard to the design of the PC-mouse by National Taiwan
University (for publication click here) and Erasamus University
Medical Center (on this page) have resulted in a slightly slanted mouse body
as with the HandShoe Mouse to prevent these physical complaints.