Bone fracture

Author: Audiopedia

A bone fracture is a medical condition in which there is a break in the continuity of the bone. A bone fracture can be the result of high force impact or stress, or a minimal trauma injury as a result of certain medical conditions that weaken the bones, such as osteoporosis, bone cancer, or osteogenesis imperfecta, where the fracture is then properly termed a pathologic fracture. Although broken bone and bone break are common colloquialisms for a bone fracture, break is not a formal orthopedic term. Signs and symptoms Although bone tissue itself contains no nociceptors, bone fracture is painful for several reasons: Breaking in the continuity of the periosteum, with or without similar discontinuity in endosteum, as both contain multiple nociceptors. Edema of nearby soft tissues caused by bleeding of torn periosteal blood vessels evokes pressure pain. Muscle spasms trying to hold bone fragments in place Damage to adjacent structures such as nerves or vessels, spinal cord and nerve roots, or cranial contents can cause other specific signs and symptoms. Pathophysiology The natural process of healing a fracture starts when the injured bone and surrounding tissues bleed, forming a fracture hematoma.

The blood coagulates to form a blood clot situated between the broken fragments. Within a few days blood vessels grow into the jelly-like matrix of the blood clot. The new blood vessels bring phagocytes to the area, which gradually remove the non-viable material. The blood vessels also bring fibroblasts in the walls of the vessels and these multiply and produce collagen fibres. In this way the blood clot is replaced by a matrix of collagen.

Collagen's rubbery consistency allows bone fragments to move only a small amount unless severe or persistent force is applied. At this stage, some of the fibroblasts begin to lay down bone matrix in the form of collagen monomers. These monomers spontaneously assemble to form the bone matrix, for which bone crystals are deposited in amongst, in the form of insoluble crystals. This mineralization of the collagen matrix stiffens it and transforms it into bone. In fact, bone is a mineralized collagen matrix; if the mineral is dissolved out of bone, it becomes rubbery. Healing bone callus is on average sufficiently mineralized to show up on X-ray within 6 weeks in adults and less in children. This initial "woven" bone does not have the strong mechanical properties of mature bone. By a process of remodeling, the woven bone is replaced by mature "lamellar" bone.

The whole process can take up to 18 months, but in adults the strength of the healing bone is usually 80% of normal by 3 months after the injury. Several factors can help or hinder the bone healing process. For example, any form of nicotine hinders the process of bone healing, and adequate nutrition will help the bone healing process.

Bone fracture

Weight-bearing stress on bone, after the bone has healed sufficiently to bear the weight, also builds bone strength. Although there are theoretical concerns about NSAIDs slowing the rate of healing, there is not enough evidence to warrant withholding the use of this type analgesic in simple fractures. Effects of smoking Smokers generally have lower bone density than non-smokers, so have a much higher risk of fractures. There is also evidence that smoking delays bone healing. Some research indicates, for example, that it delays tibial shaft fracture healing from a median healing time of 136 to a median healing time of 269 days.

This means that the fracture healing time was approximately doubled in smokers. Although some other studies show less extreme effects, it is still shown that smoking delays fracture healing. Diagnosis A bone fracture can be diagnosed clinically based on the history given and the physical examination performed. Imaging by X-ray is often performed to view the bone suspected of being fractured. In situations where x-ray alone is insufficient, a computed tomograph or MRI may be performed. Classification By cause Traumatic fracture - This is a fracture due to sustained trauma. E.g.- Fractures caused by a fall, road traffic accident, fight etc.

Pathological fracture - A fracture through a bone which has been made weak by some underlying disease is called pathological fracture. E.g.- a fracture through a bone weakened by metastasis. Osteoporosis is the most common cause of pathological fracture. Periprosthetic fracture - A fracture at the point of mechanical weakness at the end of an implant Orthopedic In orthopedic medicine, fractures are classified in various ways. Historically they are named after the doctor who first described the fracture conditions. However, there are more systematic classifications in place currently. All fractures can be broadly described as: Closed fractures: are those in which the skin is intact Open fractures: involve wounds that communicate with the fracture, or where fracture hematoma is exposed, and may thus expose bone to contamination. Open injuries carry a higher risk of infection.

Other considerations in fracture care are displacement and angulation. If angulation or displacement is large, reduction of the bone may be required and, in adults, frequently requires surgical care. These injuries may take longer to heal than injuries without displacement or angulation. Compression fractures: usually occurs in the vertebrae, for example when the front portion of a vertebra in the spine collapses due to osteoporosis. Other types of fracture are: Complete fracture: A fracture in which bone fragments separate completely. Incomplete fracture: A fracture in which the bone fragments are still partially joined. In such cases, there is a crack in the osseous tissue that does not completely traverse the width of the bone.

Linear fracture: A fracture that is parallel to the bone's long axis. Transverse fracture: A fracture that is at a right angle to the bone's long axis. Oblique fracture: A fracture that is diagonal to a bone's long axis. Spiral fracture: A fracture where at least one part of the bone has been twisted.

Comminuted fracture: A fracture in which the bone has broken into several pieces. Impacted fracture: A fracture caused when bone fragments are driven into each other. Avulsion fracture: A fracture where a fragment of bone is separated from the main mass. Anatomical location An anatomical classification may begin with specifying the involved body part, such as the head or arm, followed with more specific localization. Fractures that have additional definition criteria than merely localization can often be classified as subtypes of fractures that merely are, such as a Holstein-Lewis fracture being a subtype of a humerus fracture.

However, most typical examples in an orthopedic classification given in previous section cannot appropriately be classified into any specific part of an anatomical classification, as they may apply to multiple anatomical fracture sites. Skull fracture Basilar skull fracture Blowout fracture - a fracture of the walls or floor of the orbit Mandibular fracture Nasal fracture Le Fort fracture of skull - facial fractures involving the maxillary bone and surrounding structures in a usually bilateral and either horizontal, pyramidal or transverse way. Spinal fracture Cervical fracture Fracture of C1, including Jefferson fracture Fracture of C2, including Hangman's fracture Flexion teardrop fracture - a fracture of the anteroinferior aspect of a cervical vertebral Clay-shoveler fracture - fracture through the spinous process of a vertebra occurring at any of the lower cervical or upper thoracic vertebrae Burst fracture - in which a vertebra breaks from a high-energy axial load Compression fracture - a collapse of a vertebra, often in the form of wedge fractures due to larger compression anteriorly. Chance fracture - compression injury to the anterior portion of a vertebral body with concomitant distraction injury to posterior elements Holdsworth fracture - an unstable fracture dislocation of the thoracolumbar junction of the spine Rib fracture Sternal fracture Shoulder fracture Clavicle fracture Scapular fracture Arm fracture Humerus fracture Supracondylar fracture Holstein-Lewis fracture - a fracture of the distal third of the humerus resulting in entrapment of the radial nerve. Forearm fracture Ulnar fracture Monteggia fracture - a fracture of the proximal third of the ulna with the dislocation of the head of the radius Hume fracture - a fracture of the olecranon with an associated anterior dislocation of the radial head Radius fracture Essex-Lopresti fracture - a fracture of the radial head with concomitant dislocation of the distal radio-ulnar joint with disruption of the interosseous membrane. Distal radius fracture Galeazzi fracture - a fracture of the radius with dislocation of the distal radioulnar joint Colles' fracture - a distal fracture of the radius with dorsal displacement of the wrist and hand Smith's fracture - a distal fracture of the radius with volar displacement of the wrist and hand Barton's fracture - an intra-articular fracture of the distal radius with dislocation of the radiocarpal joint. Hand fracture Scaphoid fracture Rolando fracture - a comminuted intra-articular fracture through the base of the first metacarpal bone Bennett's fracture - a fracture of the base of the first metacarpal bone which extends into the carpometacarpal joint. Boxer's fracture - a fracture at the neck of a metacarpal Pelvic fracture Fracture of the hip bone Duverney fracture - an isolated pelvic fracture involving only the iliac wing.

Femoral fracture Hip fracture Patella fracture Crus fracture Tibia fracture Pilon fracture Tibial plateau fracture Bumper fracture - a fracture of the lateral tibial plateau caused by a forced valgus applied to the knee Segond fracture - an avulsion fracture of the lateral tibial condyle Gosselin fracture - a fractures of the tibial plafond into anterior and posterior fragments Toddler's fracture - an undisplaced and spiral fracture of the distal third to distal half of the tibia Fibular fracture Maisonneuve fracture - a spiral fracture of the proximal third of the fibula associated with a tear of the distal tibiofibular syndesmosis and the interosseous membrane. Le Fort fracture of ankle - a vertical fracture of the antero-medial part of the distal fibula with avulsion of the anterior tibiofibular ligament. Bosworth fracture - a fracture with an associated fixed posterior dislocation of the proximal fibular fragment which becomes trapped behind the posterior tibial tubercle. The injury is caused by severe external rotation of the ankle. Combined tibia and fibula fracture Trimalleolar fracture - involving the lateral malleolus, medial malleolus and the distal posterior aspect of the tibia Bimalleolar fracture - involving the lateral malleolus and the medial malleolus.

Pott's fracture Foot fracture Lisfranc fracture - in which one or all of the metatarsals are displaced from the tarsus Jones fracture - a fracture of the proximal end of the fifth metatarsal March fracture - a fracture of the distal third of one of the metatarsals occurring because of recurrent stress Calcaneal fracture OTA/AO classification The Orthopaedic Trauma Association Committee for Coding and Classification published its classification system in 1996, adopting a similar system to the 1987 AO Foundation system. In 2007, they extended their system, unifying the 2 systems regarding wrist, hand, foot and ankle fractures. Other systems There are other systems used to classify different types of bone fractures: "Denis classification" for spinal fractures "Frykman classification" for forearm fractures "Gustilo open fracture classification" "Letournel and Judet Classification" for Acetabular fractures "Neer classification" for humerus fractures Seinsheimer classification, Evans-Jensen classification, Pipkin classification and Garden classification for hip fractures Treatment Treatment of bone fractures are broadly classified as surgical or conservative, the latter basically referring to any non-surgical procedure, such as pain management, immobilization or other non-surgical stabilization. A similar classification is open versus closed treatment, in which open treatment refers to any treatment in which the fracture site is surgically opened, regardless of whether the fracture itself is an open or closed fracture.

Pain management In arm fractures in children, ibuprofen has been found to be as effective as a combination of acetaminophen and codeine. Immobilization Since bone healing is a natural process which will most often occur, fracture treatment aims to ensure the best possible function of the injured part after healing. Bone fractures are typically treated by restoring the fractured pieces of bone to their natural positions, and maintaining those positions while the bone heals. Often, aligning the bone, called reduction, in good position and verifying the improved alignment with an X-ray is all that is needed. This process is extremely painful without anesthesia, about as painful as breaking the bone itself. To this end, a fractured limb is usually immobilized with a plaster or fiberglass cast or splint which holds the bones in position and immobilizes the joints above and below the fracture. When the initial post-fracture edema or swelling goes down, the fracture may be placed in a removable brace or orthosis. If being treated with surgery, surgical nails, screws, plates and wires are used to hold the fractured bone together more directly.

Alternatively, fractured bones may be treated by the Ilizarov method which is a form of external fixator. Occasionally smaller bones, such as phalanges of the toes and fingers, may be treated without the cast, by buddy wrapping them, which serves a similar function to making a cast. By allowing only limited movement, fixation helps preserve anatomical alignment while enabling callus formation, towards the target of achieving union. Splinting results in the same outcome as casting in children who have a distal radius fracture with little shifting. Surgery Surgical methods of treating fractures have their own risks and benefits, but usually surgery is done only if conservative treatment has failed, is very likely to fail, or likely to result in a poor functional outcome. With some fractures such as hip fractures, surgery is offered routinely because non-operative treatment results in prolonged immobilisation, which commonly results in complications including chest infections, pressure sores, deconditioning, deep vein thrombosis and pulmonary embolism, which are more dangerous than surgery.

When a joint surface is damaged by a fracture, surgery is also commonly recommended to make an accurate anatomical reduction and restore the smoothness of the joint. Infection is especially dangerous in bones, due to the recrudescent nature of bone infections. Bone tissue is predominantly extracellular matrix, rather than living cells, and the few blood vessels needed to support this low metabolism are only able to bring a limited number of immune cells to an injury to fight infection. For this reason, open fractures and osteotomies call for very careful antiseptic procedures and prophylactic antibiotics. Occasionally bone grafting is used to treat a fracture. Sometimes bones are reinforced with metal.

These implants must be designed and installed with care. Stress shielding occurs when plates or screws carry too large of a portion of the bone's load, causing atrophy. This problem is reduced, but not eliminated, by the use of low-modulus materials, including titanium and its alloys. The heat generated by the friction of installing hardware can easily accumulate and damage bone tissue, reducing the strength of the connections. If dissimilar metals are installed in contact with one another, galvanic corrosion will result. The metal ions produced can damage the bone locally and may cause systemic effects as well. Electrical bone growth stimulation or osteostimulation has been attempted to speed or improve bone healing.

Results however do not support its effectiveness. Complications Some fractures can lead to serious complications including a condition known as compartment syndrome. If not treated, compartment syndrome can eventually require amputation of the affected limb. Other complications may include non-union, where the fractured bone fails to heal or mal-union, where the fractured bone heals in a deformed manner.

Complications of fractures can be classified into three broad groups depending upon their time of occurrence. These are as follows - Immediate complications - occurs at the time of the fracture. Early complications - occurring in the initial few days after the fracture. Late complications - occurring a long time after the fracture. In children In children, whose bones are still developing, there are risks of either a growth plate injury or a greenstick fracture. A greenstick fracture occurs due to mechanical failure on the tension side.

That is, since the bone is not as brittle as it would be in an adult, it does not completely fracture, but rather exhibits bowing without complete disruption of the bone's cortex in the surface opposite the applied force. Growth plate injuries, as in Salter-Harris fractures, require careful treatment and accurate reduction to make sure that the bone continues to grow normally. Plastic deformation of the bone, in which the bone permanently bends but does not break, is also possible in children. These injuries may require an osteotomy to realign the bone if it is fixed and cannot be realigned by closed methods. Certain fractures are known to occur mainly in the pediatric age group, such as fracture of the clavicle & supracondylar fracture of the humerus. See also Stress fracture Distraction osteogenesis Rickets Catagmatic H.

Winnett Orr, US Army surgeon who developed Orthopedic plaster casts References External links First Aid for Fractures Fracture and Dislocation Compendium Orthopaedic Trauma Association Authoritative information in orthopaedic surgery American Association of Orthopedic Surgeons Radiographic Atlas of Fracture After the Injury Children's Hospital Of Philadelphia.

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