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Repetitive Strain Injury (RSI) Explained

 

RSI is typically defined as an overuse disorder- a gradual build-up of overload to nerves, tendons, and muscles arising from repetitive movements or activities. Repetitive use of the same motions leads to inflammation and damage to these soft tissues. This disorder mostly affects the upper limb- particularly the elbows, hands and wrists.

 

Causes

Possible causes of RSI include but are not limited to:

  • Undertaking the same and repetitive movements and stressing the same muscle groups
  • Working in cold environments
  • Assuming a sustained and/or awkward posture for prolonged periods of time
  • Undertaking a particular activity for prolonged periods of time with no rest-breaks
  • Frequent and prolonged use of vibrating equipment
  • Adopting poor postures from working at inappropriately designed workstations
  • Undertaking a motion which involves carrying and/or lifting heavy items

 

 

Symptoms

RSI leads to a gradual development of a broad variety of symptoms, which range from mild to severe in severity. RSI particularly affects the muscles and joints of your wrists, hands, elbows, forearms, shoulders, neck. Having said this, RSI can affect other areas of the body as well.

Common symptoms may include:

  • Pain
  • Tingling
  • Cramping
  • Increased sensitivity to heat and cold
  • Tenderness
  • Fatigue
  • Loss of strength
  • Throbbing
  • Soreness
  • Achiness
  • Stiffness
  • Struggling with typical activities of daily living, such as gripping and twisting motions, carrying light weights, writing, kitchen prepping, dressing, personal cares etc

You may develop these symptoms when you undertake a task repetitively for a period of time, and can settle when you stop. Symptoms may settle over a few hours or over the course of a few days. However, if left untreated or is poorly managed, a minor RSI may gradually progress to a nasty chronic injury.

 

Diagnosis

 

If you experience mild discomfort whilst completing particular activities at home or at your job, it is a good idea to see your GP or physiotherapist to talk about RSI. But an RSI is not always simple to diagnose as there is no particular clinical test for it. Your GP will enquire about your medical history, occupation and work environment, and other activities to attempt to identify any repetitive motions you undertake that may be the cause of your symptoms. A physical examination will be undertaken, where they will assess your movement, check for pain, inflammation, sensation, tenderness, strength and reflexes in the impacted body part. RSI may be triggered by specific health disorders like bursitis, carpal tunnel, tigger finger, ganglion cyst, or tendonitis (inflammation in your tendons). Your GP can refer you on further diagnostic tests such as X-rays, Ultrasounds, blood tests, MRIs, nerve conduction tests etc, to determine if these underlying disorders may be the cause of your symptoms. You may be also be referred onto a physiotherapist and acupuncturist for conservative treatment and management for mild-moderate issues. If symptoms persist, you will then be referred onto a specialist.

 

Management

Initial treatment options for the management of RSI symptoms is conservative. This includes:

  • Rest, Ice, Compression, and Elevation (RICE principles)
  • Taking regular breaks between tasks and looking after your posture
  • Undertaking your activities and movements with appropriate form and posture
  • Intake of Nonsteroidal anti-inflammatory drugs (NSAIDs), both oral and topical as prescribed by the GP
  • Use of cold and heat to the impacted area
  • Administration of steroid injections into inflamed joints and tendons
  • Tailored exercise prescription from physiotherapists to correct posture and strengthen and stretch affected muscles
  • Acupuncture
  • Stress reduction and relaxation training
  • Use of splints and braces to help protect and rest the affected muscles and tendons

Ergonomically appropriate adjustments to your workstation and work environment may be recommended by your physio and GP- for example resetting your desk and chair if you’re working at computer, and alterations to your equipment and activities/motions to lessen the strain and stress on your muscles and joints. Surgery may be necessary in some cases.

 

Prevention

Minimizing repetitive actions particularly if they involve the use of heavy machinery or vibration. Improving your working posture and work-environment as well a taking regular breaks. Employers often undertake risk-assessments when you join a company to determine that the work area is ergonomically fit, comfortable and appropriate for you. You may be able to request for an assessment if you have not had one or are having issues with your work environment

Dealing with De Quervain’s

De Quervain’s tenosynovitis is categorised as an overuse disorder which affects the tendons in your wrist that you use to straighten your thumb. It is associated with swelling in the two tendons around the base of your thumb, which then causes the sheaths encompassing these tendons to become inflamed. This results in increased pressure on surrounding nerves as well, resulting in symptoms such as numbness, tenderness and pain. You are likely to have these symptoms when making a fist, gripping or grasping something, pinching, twisting your wrist, and/or laterally bending your thumb.

Symptoms

The key distinguishing symptom of De Quervain’s tenosynovitis is tenderness and/or pain at the base of your thumb. You can experience pain referring up or down your forearm. You may notice the pain gradually develop or appear suddenly, and worsen when using your wrist, thumb and hand. Painful movements include making a fist, gripping or grasping something, twisting your wrist, pinching, and/or laterally bending your thumb.

Other key symptoms include:

  • Swelling at the base of your thumb
  • Experience numbness along the back of your index finger and thumb
  • ‘Snapping’ or ‘catching’ sensation experienced when you move your thumb

Causes

De Quervain’s tenosynovitis is typically associated with the chronic overuse of your thumb, hand and wrist. When undertaking movements like gripping, grasping, clenching, pinching, or wringing items in your hand, the two tendons in your lower thumb and wrist usually glide in a smooth manner via the small tunnel which attaches them to the base of your thumb. However, when you repeat a certain movement day in day out, it irritates the sheath around these two tendons, resulting in swelling and thickening which restrict their movements.

Factors which may increase your risk of developing this condition are:

  • Being in the age bracket of 30 to 50 years old
  • Pregnancy
  • Found more commonly in women.
  • Baby care: Lifting, carrying and/or holding your child repetitively with using your thumbs as leverage.
  • Hobbies or occupations which involve repetitive wrist and hand movements

Diagnosis

Your doctor or physiotherapist will discuss your medical and occupational history, and carry out a physical assessment of your wrist and hand.

The physical examination will include palpation for pain when pressure is applied to the thumb side of the wrist, as well as clinical test called the Finkelstein test. This test requires you to bend your thumb across the palm of your hand and bend your fingers down over your thumb. You will then bend your wrist towards your little finger. If this causes pain on the thumb side of your wrist, you are likely to have this condition.

Whilst X-rays are usually not needed for the diagnosis, however, you may be referred on for ultrasound imaging.

Management

The aim of the management for this condition is to reduce pain caused by the irritation and inflammation of the tendons, preserve movement in the wrist and thumb, and prevent its reoccurrence. If treatment is commenced early, the symptoms should subside in 4-6 weeks. If your symptoms arise during pregnancy, they may settle around the end of the pregnancy or post the breast-feeding stage.

  • Splints may be utilised to immobilise and rest your wrist and thumb
  • Ice application to the affected area
  • Your doctor may recommend the use of anti-inflammatory medication to ease swelling and decrease pain
  • Avoiding pinching with your thumb when moving your wrist from side to side
  • Avoidance of aggravating repetitive movements and activities
  • Administration of corticosteroid injection into the tendon sheath can ease pain and decrease swelling if recommended by your GP
  • Physiotherapy: Your physiotherapist will examine how you use your wrist and provide suggestions on how to make technique modifications to relieve stress on your wrists. They will teach you strengthening exercises for your wrist, hand and arm to help decrease pain and limit tendon irritation
  • Surgery may be recommended by your specialist in more severe cases and if conservative management fails