Complications Of Fractures

Fractures treatment in modern times allows most of the fractures to heal without problem. But complications of fractures do occur sometimes which may affect management and outcome.

Complications of fractures can be acute or chronic.

Acute complications of fractures are mostly due to initial injury and generally  as a result of the initial trauma and include neurovascular and soft tissue damage, blood loss and localised contamination and infection.

Delayed complications of fractures may occur after treatment and may include malunion, embolic complications, infection and loss of function.

Complications of fractures are affected by fracture site and pattern, type of treatment, patient age, nutritional status, smoking status and alcohol use.

Normal fracture healing

Factors affecting fracture healing

Early Complications of Fractures

• Disruption of major vessels may lead to blood loss
• Pneumothorax, flail chest and respiratory compromise in case of rib fractures
• Hip fractures, particularly in elderly patients, lead to loss of mobility which may result in pneumonia, thromboembolic phenomenon, fat embolism or rhabdomyolysis
• Vascular injury
• Nerve Injury
• Visceral injury causing damage to structures such as the brain, lung or bladder.
• Compartment syndrome
• Wound Infection
• Fracture Blisters

Late complications of Fractures

• Delayed union, malunion, non union
• Joint stiffness, contractures
• Myositis ossificans
• Avascular necrosis
• Complex Regional Pain Syndrome
• Osteomyelitis
• Growth disturbance or deformity.

Vascular Injury

Vascular injuries, especially arterial injuries may have disastrous consequences resulting in the loss of life and limb. A vessel can get injured any where in its course but certain areas are more prone than others due to location of the vessel. The axilla, medial and anterior upper arm, and antecubital fossa particularly are high-risk areas because of the superficial location arteries in these regions.

In lower limb, the inguinal region, medial thigh, and popliteal fossa particularly are considered high-risk locations.
Both in upper and lower limbs, there is one single vessel at the beginning of limb which divides into branches after it has traversed some distance. In upper limb this division is beyond elbow and in lower limb just below knee.

Thus before the furcation or division of the vessel, there is a single vessel supply and after furcation it becomes two in upper limb and three in lower limb. This is important because when injury is to a vessel above elbow or knee, it means loss of entire supply to the limb and thus risk of loss of limb.

Signs suggestive of vascular injury

• Active or pulsatile hemorrhage
• Pulsatile or expanding hematoma
• Dusky limb
• Cold limb
• Signs of limb ischemia – Pallor, paresthesias, pulse deficit, paralysis, pain on passive extension of the compartment [Earliest most sensitive physical finding] and diminished or absent pulses

Doppler ultrasound can help to find whether the vessel distal to injury is patent or not. Arteriography is a seminvasive technique that can tell the presence of arterial injury reliably.

Arterial Injury is an emergency. The results of vascular surgery are best before 6 hours after the injury has occurred. At site of  emergency, the affected limb should be immobilized. The affected limb should not be elevated.Vessel repair is a specialized procedure and vascular surgeon is required for this. After both the surgeries have been done, fasciotomy of the limb is advised to avoid compartment syndrome.

Nerve Injury

If the fracture is open, nerve should be explored at the time of debridement. If the wound is clean, the nerve cleanly transected, and the soft tissue bed adequate, primary nerve repair can be done.

Otherwise, nerve ends should be tagged together with sutures to prevent retraction and facilitate later repair.

If the fracture is closed, nerve injury is neuropraxia most of the times. If the fracture is being treated with closed reduction and plaster cast then nothing more needs to be done. This kind of injury generally recovers on its own.

However, if there is an injury occurs while reduction or manipulation, exploration is indicated.

If fracture is being treated by surgery, it is always prudent to explore the nerve as well.

Visceral Injury

This injury mostly occurs in fractures around chest, abdomen and spine. The treatment depends on the part injured and fracture pattern.

Compartment Syndrome

Compartment syndrome is an acute problem following injury or surgery in which increased pressure within a confined space in the limb impairs blood supply of the limb resulting in ischemia.

Compartment syndrome is a condition caused by increased pressure within a confined space, or compartment, in the body. It mostly is associated with fracture of tibia, forearm fractures, foot injuries and hand injuries.

Compartment syndrome results in ischaemia of the tissues. If untreated, it can result in necrosis of the muscles and other tissues.
However, rapid diagnosis and treatment can lead to complete recovery.

When fracture occurs, the force of injury also results in soft tissue injury. Bleeding from the bone or other tissues accumulate in muscle compartments which are limited by fasciae and muscular septae. This causes elevation of the pressure in the compartment and capillary blood flow is compromised.

Ischaemia or decreased tissue perfusion results in edema of the soft tissue which further raises the intra-compartment pressure. Venous and lymphatic drainage of the injured area gets compromised, adding further insult. This further increases the pressure and vicious cycle is formed.

Untreated compartment syndrome mediated ischemia of the muscles and nerves lead to eventual irreversible damage and death of the tissues within the compartment.

Pain is is usually of severe, deep, constant, and poorly localized and is sometimes described as out of proportion with the injury. The pain is aggravated by stretching the muscle group within the compartment and is not relieved by analgesia.

Paresthesia (alterated sensation e.g. “pins & needles”) in the cutaneous nerves of the affected compartment is another typical sign.
Paralysis of the limb is usually a late finding. The compartment may feel very tense and firm as well.

Lack of pulse rarely occurs in patients. and is not a reliable sign. Moreover, it is present in very late stages. Pulse is only affected if the relevant artery is contained within the affected compartment.

Acute compartment syndrome is a medical emergency. It requires opening up of compartments to release pressure. This procedure is called fasciotomy.

Fat Embolism

See Fat Embolism Syndrome.

Fracture Blisters

These are a relatively uncommon complication of fractures and occur in areas where skin adheres tightly to bone with little intervening soft tissue cushioning. Examples include the ankle, wrist, elbow and foot.

Fracture blisters are believed to result from large strains applied to the skin during the initial fracture deformation, and they resemble second-degree burns rather than friction blisters.

Blisters alter management and repair, often necessitating early cast removal and immobilisation by bed rest with limb elevation.

Infection

Infection can occur in the bone following a fracture by three means

• The fracture is open and wound gets infected by organism introduced from without.
• The fracture hematoma can get infected by organisms from bloodstream.
• Post surgical infection

Despite all the measures to control it, infection occurs in some open fractures and closed fractures. The incidence is higher in patients with extensive soft tissue injury.

First goal of the treatment is to prevent the infection. however, if an infection develops it should be closed.

If the infection is superficial and limited, local cleaning and antibiotics help. Drainage of pus, debridement of local necrotic tissues, irrigation of the wound are various local measures that can be used in case of deep infections.

If internal fixation is in place and the fixation device has not loosened, it should not be removed. Majority of internally fixed fracture unite in spite of infection with antibiotic treatment and drainage. If fixation is loose, revising or removing the internal fixation and using external fixation to maintain stability and to allow dressing changes and wound care should be considered.

Uncontrolled infection can lead to septic arthritis and osteomyelitis.

Problems with Bone Healing (nonunion, delayed union and malunion)

Delayed union is failure of a fracture to consolidate within the expected time. Healing processes are still continuing, but the outcome is uncertain.
Non-union occurs when there are no signs of healing after >3-6 months (depending upon the site of fracture). Malunion refers to union of fracture in unsatisfactory position.

Delayed and Non union may be managed conservatively by putting load on the bone as by weight bearing in case of lower limbs, bone stimulation by pulsed ultrasonic or electromagnetic or drug treatment with particularly in patients with osteoporosis.
Most of the patients though require surgery includes fixation and bone grafting or bone graft substitutes.

Myositis ossificans

Myositis ossificans involves calcifications and bony mass formationop within muscle and can occur as a complication of fractures, especially in supracondylar fractures of the humerus. Rest, NSAIDs may be helpful.

Complex Regional Pain Syndrome

Complex regional pain syndrome is a chronic progressive disease characterized by severe pain, swelling and changes in the skin in the involved region. It can be triggered by injury.

Iatrogenic Complications of Fractures

Pressure ulcers due to cast, thrombophlebitis due to stasis following immobilization or plaster application. Nerve injury, veseel injury can occur during to surgery. Pin tract infection can occur in case of external fixation.

Synostosis

It is an uncommon complication of fracture and occurs typically in forearm fracture. This leads to union of both the bones. This complication has been noted in patients who had crushed injury of forearm or there was an associated head injury.

Indomethacin 25 mg three times a day, to be taken with meals for 3 weeks is thought to control reformation of the bone. Active range of motion exercises is started within 24-48 hours. While rest a splint is used which is continued for 6 week.
Results are  quite variable.