Shoulder Case
Shoulder Case
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how much torque must she product in each case to lift the weight?
Priscilla is working out in the gym with a 2 kg mass that she holds in one hand and gradually lifts up and down.
Will Priscilla find it easier to lift the mass if she pivots her arm at the shoulder or at the elbow?
If Priscilla's arm is .6m long from her shoulder to her palm and .28m long from her elbow to her palm, how much torque must she produce in each case to lift the weight?
torque is force * distance. Distance from elbow to hand is shorter than distance from shoulder to hand, so pivoting from the elbow makes lifting the weight easier.
max torque is needed when her arm is horizontally straight, so for shoulder:
2kg*9.8m/s^2*.6m ~= 12 Nm
for elbow:
2kg*9.8m/s^2*.28 ~= 6Nm
"the Impact of a Frozen Shoulder"
The syndrome known as Frozen Shoulder is characterised by painful loss of movement of the shoulder joint. In this case, the word “frozen” is analogous to “stiff”. “Adhesive Capsulitis” is a medical term for this syndrome.
The capsule surrounding the shoulder joint becomes thickened and contracted. A decrease in the amount of synovial fluid inside the capsule (fluid that supplies nutrition and lubricates the joint) decreases. The result is restriction of movement of the shoulder accompanied by pain. This restriction affects only certain movements of the shoulder, thus presenting a specific pattern.
Why the syndrome occurs is a bit of a mystery. It is more common in people between the ages of forty and sixty years and is often associated with a tendonitis or bursitis. It can occur in athletes following trauma if the shoulder is immobilized for an excessive period of time, but this seldom happens. Many people acquire the syndrome without any specific injury at all. It may develop in people following a virus and can even affect both shoulders of an individual consecutively over a period of years.
Pain, stiffness and recovery are the three phases of the frozen shoulder syndrome, which together can last for up to two years. In some cases it is possible that early intervention in the syndrome can help prevent the progression to a fully developed frozen shoulder and its lengthy involvement.
Maintaining a good range of motion is important but this must be done respecting pain limitations. Please be advised that ignoring the problem and compensating with the other arm is likely to contribute to further progression of this syndrome.
Warning signs to watch for are a progressive restriction of shoulder movement accompanied by varying degrees of pain. Other significant findings include waking up at night, being unable to lie on the given shoulder and pain radiating to the elbow or hand.
Seeing your GP early on is important so that other pathologies can be ruled out, and may help prevent the syndrome from becoming prolonged.
Medication can be indicated in some cases.
However Physical therapy can play a very important role in educating an individual on exercises appropriate for each stage of this syndrome in order to optimize healing time and pain management. This is usually done in “bouts” with long term monitoring of the condition. Frozen shoulders, as mysteriously as they come on, can self-resolve almost spontaneously after two years has elapsed.
However, proper management and education can certainly optimize a sufferer’s function and productivity during the prolonged course of the syndrome.
Terry O’Brien
Back Trouble UK
www.backtrouble.co.uk
About the Author
Frozen Shoulder Case
