Tendonitis occurs when the tendon becomes inflamed. This condition commonly occurs in the rotator cuff, a tendon linking four muscles in the shoulder. Together, these muscles lift and rotate the shoulder. When the arm is lifted, the front part of the shoulder bone rubs or pinches (impinges) on the rotator cuff. Impingement and friction lead to local inflammation, which then results in tendonitis. The bursa, a fluid-filled sac that reduces the friction in the shoulder joint, may become inflamed, resulting in a condition called shoulder bursitis. Repeated exposure to risk factors may also result in a partial or complete tear of the rotator cuff.
Work-Related Risk Factors
- Working with the hands above the shoulder level ("overhead work").
- Repetitive lifting of the shoulder especially out to the side.
- Holding the shoulder in one position for more than a few minutes on a regular basis.
- Use of hand tools during overhead work.
Engaging in sports in which the arms are frequently overhead or rotated (such as swimming and throwing a softball) may contribute to the development of shoulder tendonitis. Age is also a risk factor for shoulder tendonitis.
Development and Progression
Tendon degeneration results from mechanical stress and reduced blood flow to the tendon. The blood flow to the tendon can be reduced because of impingement and muscle tension.
Shoulder tendonitis has been categorized into three stages. Stage I is characterized by swelling (edema) and bleeding (hemorrhage). This stage is most commonly seen in individuals under the age of 25 who have histories of overhead work or overhead activity in sports. In Stage II, there is further deterioration of the tendon and bursa. Individuals with this stage of tendonitis are typically 25 to 40 years old. In Stage III, there may be bone spurs and partial or complete tendon rupture. This stage is usually seen in individuals over the age of 40.
Repetitive work involving the shoulder may cause the bursa to swell and become inflamed. This condition is called bursitis. Bursitis and rotator cuff tendonitis often occur together.
Common Symptoms
Workers with shoulder tendonitis often experience pain when the shoulder is lifted and rotated. The area where the tendons attach to the bone of the upper arm (humeral head) may feel tender. In addition, workers may not be able to move the shoulder fully in all directions. Pain may radiate into the upper arm.
Common Treatment
Without rotator cuff tear:
For shoulder tendonitis without a rotator cuff tear, it is generally best to attempt conservative (non-surgical) treatment first. Conservative treatment includes rest and avoidance of overhead activities. Stretching exercises and physical therapy are often beneficial. Nonsteroidal anti-inflammatory drugs (NSAIDs, e.g. ibuprofen or naproxen) are often helpful. Other treatments include rest, ice or heat applications. Injections of corticosteroids ("cortisone injections") may be beneficial in the short term. Many patients experience a gradual improvement in pain and function over several weeks or months.
If conservative treatment fails to relieve pain, surgery may be considered. Surgery is performed to create more space for the rotator cuff by removing the impingement. The most common surgical treatment is called subacromial decompression or anterior acromioplasty. Patients may continue to experience pain for 2-4 months after surgery.
With rotator cuff tear:
Conservative treatment for a rotator cuff tear is similar to that for shoulder tendonitis. Rest and limited overhead activity are advised, and a patient may also be told to wear a sling to support the injured arm. Anti-inflammatory drugs and a cortisone injection may be used. Strengthening activities and physical therapy are also helpful.
Should surgical treatment become necessary, a surgeon will typically perform a debridement, which is a trimming and smoothing procedure that eliminates the impingement on the rotator cuff. If there is a complete tear, the two sides of the tendon may be sutured together. After surgery, the arm initially will be immobilized. Following this, the patient will begin an exercise program. The patient may not experience complete recovery for several months.
Low back pain (LBP) is among the most common health complaints in working-aged populations worldwide. In the U.S., 70%-80% of adults will experience a significant episode of LBP at least once in their lives. Low back disorders are conditions associated with lifting and other forceful movements of the back. Episodes of LBP are characterized by varying levels of pain and symptoms in the low back (lumbar spine). Low back disorders can even cause leg pain at times.
Work-Related Risk Factors
- Work-related lifting and forceful movements
- Whole body vibration
- Awkward postures (bending and twisting)
- Heavy physical work
- Poor job satisfaction, perception of intensified workload, lack of job control, and certain personality traits
- Lifestyle factors associated with LBP include smoking, a sedentary lifestyle, and obesity.
Development and Progression
The low back may be injured due to either a sudden stressful event or the cumulative effect of stressful activities. Strains of the muscle or sprains of the ligaments surrounding the spinal joints occur most commonly. Injuries to the low back may also involve the intervertebral disc.
The intervertebral disc is composed of a ring of fibers surrounding a sac of fluid or gel-like material. Discs may be damaged due to a sudden stress (e.g. a fall, slip, or catching an unexpected load), or due to cumulative problems when stressful activities stretch, tear, or unravel the protective fibers surrounding the sac of fluid. When the fibers can no longer contain the fluid, small leaks or bulges can occur or the disc may flatten. The most commonly injured low back discs are between the 4th and 5th lumbar vertebrae (L4-L5), and between the 5th lumbar vertebrae and the sacrum (L5-S1). Disc problems may lead to a pinched nerve.
The causes of many episodes of LBP are unclear. Even with clinical tests and imaging procedures, about 85% of patients cannot be given a precise diagnosis. The pain in these cases is presumed to be related to muscle, ligament, or tendon injury or degenerative changes.
Common Symptoms
Individuals with low back problems typically experience pain in the low back (lumbar spine). Leg pain may accompany low back pain. Often, leg pain is localized to the side or back of the thigh, but sometimes the pain may go all the way to the foot. This leg pain is called "sciatica." Individuals may also have tenderness in the low back and a limited range of motion for bending forward, backward, sideways, or twisting. Bending forward tends to increase pain levels.
Common Treatment
Initial treatment for most episodes of low back pain includes avoidance of stressful activities and occasionally one to two days of bed rest. Nonsteroidal anti-inflammatory drugs (NSAIDs, e.g. ibuprofen or naproxen) are often helpful, and stronger drugs may be prescribed (muscle relaxants or narcotics) for more severe, acute pain. Other treatment options may include application of heat and cold, physical therapy, spinal manipulation, or injections. Some LBP cases may require surgery (ruptured disc or severe trauma cases).
Most workers with occupational LBP get better. Half of workers improve in one week and 90% improve in 30 days, regardless of treatment. Light duty work activities may be prescribed by the physician during the recovery period. The remaining 10% of workers may have a chronic condition and may not be able to return to their previous jobs. Many workers may suffer from residual pain that may affect work or activities of daily living.
Tension neck syndrome (myofascial pain syndrome) is characterized by pain in the shoulder-neck region along with tenderness over the shoulder-neck muscles. It is one of the most common work-related MSDs of the neck and shoulder. Occupational groups with work tasks requiring repetitive arm movements and constrained work postures show high rates of tension neck syndrome.
Work-Related Risk Factors
- Holding the shoulder-neck muscles in one position (when the muscle contracts but there is no movement), such as those used to hold the head or arm in a certain position for a long period of time.
- Extreme bending and twisting of the neck.
- Repetitive movements of the shoulders and neck.
Development and Progression
One possible explanation for tension neck syndrome is that muscle fibers become overloaded when the shoulder muscles are contracted for long periods of time. This causes muscle pain. In cases of chronic neck pain, it is possible that an initial injury does not heal completely. Pain receptors in the neck area may become more sensitive. When these pain receptors send messages to the brain, the brain may perceive normal activity as being painful.
How readily tension-neck syndrome heals varies among individuals. In general, pain and discomfort may be decreased but not eliminated. It is important to begin rehabilitation early to minimize the amount of time lost and the level of the disability.
Common Symptoms
Symptoms of tension-neck syndrome include activity-related pain, stiffness, and severe pain when in extreme positions (e.g. with the arm fully extended). It is difficult to diagnose this disorder using objective tests, because blood tests and radiographic examination are typically normal. However, it is important that workers undergo a thorough examination in order to exclude other diagnoses related to the neck and shoulder.
Common Treatment
Workers who have been diagnosed with tension-neck syndrome may require modifications of their job tasks and job redesign. It can also be helpful for workers to be trained to minimize strain during work by avoiding static contractions that last for a long time. Strengthening and stretching exercises can reduce pain and increase performance, though workers may experience a temporary increase in pain at the beginning of the training. Trigger-point injections may be beneficial. The presence of additional stress at work and at home can make treatment of tension-neck syndrome more difficult and less effective.
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