
Impingement Syndrom
Painful shoulder joints
are very common. Mostly the pain is not caused by the bony structures
but the surrounding soft tissue. The gliding area with its bursa
between the roof of the shoulder (acromion) and the
rotator cuff is involved very frequently. Chronic bursitis will
lead to a narrowing of the subacromial space and painful friction
of the rotator cuff, which is called impingement-syndrome.

Chronic intensive work related overhead acitivities or sports
like tennis, baseball or weight lifting may cause an irritation
and inflammation of the subacromial bursa with narrowing
of the subacromial space and subsequent impingement of the
rotator cuff. Calcification of the rotator cuff tendons,
tendon ruptures, osteophytes of the acromion and/or osteoarthritis
of the acromio-clavicular joint may also cause shoulder
pain. Pain is provoked mainly by elevation of the arm in
any overhead position. For initial treatment rest, antiinflammatory
drugs and subacromial injections are recommendable and may
soothe the pain. Without treatment usually the pain gets
worse, especially during the night. The patients can hardly
sleep on the side of the involved shoulder. If the inflammation
becomes chronic, it normally spreads out to the tendons
of the rotator cuff. It is now difficult to elevate the
arm and some patients feel a certain weakness. At this stage
first tears of the rotator cuff may be diagnosed. Gradually
the shoulder joint looses a considerable amount of mobility,
which may support the indication for operative treatment.

By the help of Arthroscopy the shoulder joint itself and
the subacromial joint space can be inspected. After confirmation
of the diagnosis operative treatment is done at the same
occasion. The inflammated bursa is resected and in case
of small tears of the rotator cuff it can be debrided (smoothened).
The underneath surface of the acromion is abraded, which
means that the subacromial space will be enlarged (subacromial
decompression). The whole intervention is done with powered
instruments, which are introduced through small skin incisions.
In cases of osteoarthritis of the acromio-clavicular joint
the resection of the lateral end of the clavicula may be
indicated.

This is a typical disease of the mid-age-patient. There
is a higher incidence of female patients. The cause of the
disease is uncertain. The x-ray findings are calcified deposits
of various sizes near the insertion of the supraspinatus
tendon (one of the four tendons of the rotator cuff). These
deposits are irritating the subacromial bursa and thus causing
massive acute pain. Possible conservative treatment is anti-inflammatory
medication and local subacromial injections. Quite often
the inflammatory reaction leads to the resorption of the
deposit and the patient is healed. Unfortunately this is
not the case in every patient and surgical treatment then
might be indicated.

The resection of calcified deposits is usually no problem.
After introduction of the arthroscope the subacromial joint
and the bursa can be inspected and the deposits are localized,
sometimes by the help of a fluouroscope. The rotator cuff
is palpated with a small probe and the deposit can be debrided.
The intervention is done on an out-patient basis or as a
day-case.

Painful lesions of the shoulder may cause stiffness of the
shoulder joint. However, in the majority of cases this stiffness
(frozen shoulder) is a pathology of its own. For aetiology
endogenic factors like menopause, diabetes or a pathologic
thyroid condition are discussed. The clinical feature is
a very painful stiffness of the involved joint caused by
a dramatic shrinking of the joint capsule. Conservative
measures (physiotherapy, anti-inflammatory medication and
intraarticular injections) are the treatment of choice over
a couple of months. If this regime fails, the affected shoulder
joint can be treated operatively. By the help of arthroscopy
the joint capsule can be extended gradually. In difficult
cases a separation of the joint capsule from the glenoid
and synovectomy may be necessary.

After shoulder surgery 3
to 4 months for rehabilitation have to be taken into account.
The treatment is physiotherapy with active and passive exercises
without immobilisation of the arm. Team work and the patients
discipline are essential for an excellent result in terms
of painless full function of the operated shoulder joint.
Sometimes continuous passive motion at home on a motor device
is helpful in addition to physiotherapy. Most of the patients
should take antiinflammatory drugs for a certain time. The
overall results after this type of shoulder surgery are
good.
