ARM (Humerus) Fractures
What is a Humerus Fracture?
The humerus is the upper arm bone and it forms two joints —shoulder joint and elbow joint. Fractures of the humerus are common in elderly individuals suffering from osteoporosis.
Causes of Humerus Fractures
Humerus fractures are caused by traumatic injuries such as a fall on an outstretched hand from a height or motor vehicle accidents. In younger individuals, a severe trauma can cause these fractures.
Types of Humerus Fractures
Humerus fractures can be categorized into 4 groups:
Greater tuberosity fractures: Greater tuberosity is the insertion site for attachment of rotator cuff tendons. Greater tuberosity fractures are less common and are seen in cases of shoulder dislocations and in those with osteoporosis. Greater tuberosity fragment is pulled off when the cuff muscle contracts or the anterior shoulder dislocates. Direct impact to the shoulder causes the tuberosity bone to break into multiple fragments. Partial rotator cuff tears often accompany non-displaced fractures and these fractures can be diagnosed using MRI or diagnostic arthroscopy.
Lesser tuberosity fractures: These fractures are often caused by posterior shoulder dislocations or traumatic muscle contractions by electrical shock or convulsions. If left untreated, these fractures cause subscapularis muscle (stabilizer and mobilizer muscle) deficiency and require a major muscle transfer procedure.
Surgical neck fractures: Fractures of the surgical neck are most common in patients with osteoporotic bone. These fractures also damage the axillary nerve that carries sensory information from the shoulder.
Humeral head fractures: Humeral head fractures very often occur in elderly individuals and chances are more in those with osteoporotic bone. These fractures occur in younger individuals by significant trauma, whereas a mild traumatic injury can cause fracture in elderly individuals with osteoporosis.
In addition to the above, other types of humerus fractures are two, three, and four-part fractures. A fracture causes multiple fragmentation of the humerus.
Symptoms of Humerus Fractures
Patients with humerus fracture experience severe pain, swelling, and restricted motion of the shoulder.
Diagnosis of Humerus Fractures
Humerus fracture is diagnosed by a physical examination, X-ray of the affected area and/or computerized tomography (CT) scan.
Treatments for Humerus Fractures
Most humerus fractures are minimally displaced and can be treated with conservative approaches such as use of a sling to immobilize and early physical therapy to improve the functional outcome. Surgery may be necessary in displaced fractures. The multiple fragments are fixed with plates, screws or pins and in severe cases shoulder replacement surgery is performed.