The shoulder is a wonderful joint. A healthy normal range of movement of the shoulder girdle is exceptional. The articulation of the humerus (upper arm) in its socket or fossa, and that articulation with the clavicle (collar bone) and acromion process of the scapular (shoulder blade), enable the many movements of flexion, extension, abduction, adduction, circumduction, protraction and retraction, and internal and external rotation. There are thus, many muscles involved in shoulder movement, that maintain its stability and integrity, all of which should work together (ideally in the correct firing pattern), to enable its efficient and smooth movement; more on this later. However, muscles alone cannot ensure the correct function of the shoulder. There are of course ligaments, tendons, bursae and articular capsules that need to work in harmony and smoothly to ensure such mobility while maintaining stability. If the ball of the upper arm is not kept centred, abnormal stress is placed on surrounding tissues (muscles, tendons, bursae and ligaments) and may cause gradual injury.
Common Causes of Shoulder Injury
There are many different causes of shoulder pain. Repetitive and/or forceful overhead sporting activities, such as swimming or throwing a baseball, may cause pinching of the rotator cuff or biceps tendons. Of course, trauma such as falls or motor accidents can also injure the shoulder.
However, quite often, shoulder pain occurs with no apparent reason or specific injury. Occasionally, poor sitting posture may place increased stress on the shoulder and cause pain. Posture at a desk with arms or specifically one dominant arm outstretched reaching for the mouse or keyboard, put strain a constant and repeated strain on the rotator cuff muscles, tendons and ligaments, as well as forcing an anterior head carriage in to the equation. All of this places unnecessary stress on the postural musculature of the neck, thoracic spine and shoulder, causing altered movement patterns and secondary injury to tissues-without even realising you are doing it!
Common shoulder problems include:
- Biceps Tendonitis: The biceps tendon attaches your biceps muscle in your upper arm to the front of the shoulder. Many people consider the long head of the biceps tendon to act as a fifth rotator cuff tendon, offering stability to the front of the shoulder. This tendon can get pinched by the bony anatomy of the shoulder blade or by ligaments that attach to the collarbone and shoulder blade, causing tendonitis. Overloading the biceps by lifting something heavy may cause biceps tendonitis (also called shoulder tendonitis). Strengthening the biceps helps prevent injury.
- Shoulder Bursitis: A bursa is a fluid-filled sac that helps body structures glide smoothly over one another. There is a bursa that lies between the humerus bone and the shoulder blade. This bursa can be pinched in the shoulder, leading to pain.
- Rotator Cuff Tendonitis: The rotator cuff is a group of four muscles that help support and move the shoulder. Their primary role is to help hold the ball of the arm bone in the socket while the arm is moved. The rotator cuff tendons attach to the arm bone in an area that lies directly underneath a bony prominence of the shoulder blade. The tendons can get pinched underneath this bone and become inflamed and sore.
Strengthening the muscles that converge to form the rotator cuff therefore is an excellent way to help prevent common shoulder injuries including tendonitis, rotator cuff tears, and shoulder impingement syndrome. Age-related changes in rotator cuff tendons leave them less elastic and more susceptible to injury. There is also a gradual loss of muscle mass that occurs with ageing, which can be counteracted with strengthening exercises.
What are your Rotator Cuff Muscles?
The rotator cuff is the main stabiliser of the shoulder joint, and is actually the collective term of 4 separate muscles surrounding the shoulder joint. Each attaches to the tuberosities of the humerus (upper arm), whilst also fusing with the joint capsule (the surface of the socket covered in cartilage). The resting tone of these muscles act to compress the humeral (upper arm) head into the glenoid cavity (the socket).
The supraspinatus muscles are located at the top of the shoulder and (along with other muscles) abducts the shoulder – it raises the upper arm and moves it away from the body.
The subscapularis muscles are the largest of the rotator cuff muscles. They are triangular in shape and sit on the inside surface of the shoulder blades – they primarily internally (medially) rotate or inwardly twists the humerus (upper arm), as in the movement of if slamming a door shut. It also stabilises the shoulder girdle and assists in the downward motion of the arm from being high above the head.
The infraspinatus muscles sit on the back of the shoulder blades – they externally rotate the shoulder/bring your arm behind your back (fist outwards). Imagine the movement initiated at the start of throwing a ball, where the arm is drawn outwardly rotating and back.
Teres minor starts from the posterior- lateral border of the shoulder blades and attaches to the greater tubercle of the humerus (bony prominence of the upper arm). It is also responsible for externally rotating the arm (turning outwards such as throwing a ball). Though each rotator cuff muscle has a primary function of movement at the shoulder, they all work together to stabilise the shoulder joint. Strengthening all the muscles of the rotator cuff is important but premature strengthening can delay healing and cause more pain. For specific advice regarding injury-appropriate rotator cuff strengthening, it is highly recommended that you consult the professional advice of an experienced musculoskeletal physiotherapist or Sports therapist.
If you have developed shoulder pain as a result of trauma like a fall or a car accident, you should seek medical attention immediately. Also, if your shoulder pain has lasted for more than two to three weeks and is accompanied by significant functional loss, a visit to a physiotherapist or sports therapist is recommended.PRICE – Protection, Rest, Ice, Compression, ElevationInitially, a short period of rest is recommended for shoulder pain. This should last two to three days. During this period, you can apply ice to the shoulder to help control inflammation and provide symptomatic relief. Ice can be applied for 15 to 20 minutes every 2 waking hours.
You can also start gentle pendulum exercises during this time as in the illustration to the right. By keeping the shoulder mobile, you can avoid a frozen shoulder (adhesive capsulitis).
After a few days of rest, shoulder exercises can be started to help improve the range of motion of the joint and improve the strength of the rotator cuff muscles
As stated earlier, the rotator cuff helps stabilise the ball in the socket when you lift your arm, so strength here is important.
However, there is a general rule of thumb in the treatment and rehabilitation of injuries to the shoulder; and that is LENGTHEN BEFORE YOU STRENGTHEN, so some gentle stretching exercises should be performed to reduce tension in the muscles supporting the shoulder. These may be found in the article entitled Back and Neck Pain – Is your Poor Posture to Blame?
Similarly, before embarking on strengthening exercises, be sure that you have sought the advice as to which of the rotator cuffs are injured, and to what degree.
It is then important to begin with ISOMETRIC STRENGTHENING EXERCISES, which require a contraction of the muscle/s involved WITHOUT any range of movement (a static hold if you will.)
Isometric contractions and stretching should be performed daily, and a gradual increase in range of movement should be aimed for, by performing the pendulum exercise.
Active Range Of Motion
Finally, as range of movement increases with reduced pain, some scapular setting exercises are advisable.
Active Training of the Scapula Muscles.
Exercises that help to strengthen the scapulae setting muscles are;
Scapular Retraction: Pinch the back of the shoulder blades together using good posture. This may be progressed to performing the exercise holding the ends of a thera band in each hand while the middle is attached to a firm door handle. Standing with feet in a solid base (split stance) and core tight, draw the elbows backwards, pinching the shoulder blades together. Be sure that your shoulders are depressed/relaxed rather than hunched upwards while performing this.
Shoulder Shrugs: Pull shoulders up and back and hold. 3 sets / 10 reps.
Lower Trapezius Exercise: 3 sets / 10 reps.
Progressive Push Up Plus: This should only be attempted after the previous exercises can be performed pain free, and should be progressed gradually; starting with the push up plus against a wall, then to inclined, and finally to the floor beginning in a Box Press Up position
As with all soft tissue injury it is advisable to seek the advice of a physical therapist who will be able to more clearly identify the structures that are injured or require lengthening or strengthening. Visit our online booking system here https://online.tm2app.com/c1chiropractichealthcentre