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AAST injury scoring scales

The American Association for the Surgery of Trauma (AAST) injury scoring scales are the most widely accepted and used system of classifying and categorising traumatic injuries. Injury grade reflects severity, guides management, and aids in prognosis. At the time of writing (mid 2016), 32 differe...

AAST kidney injury scale

The American Association for the Surgery of Trauma (AAST) renal injury scale 3-4 is the most widely used grading system for renal trauma at the time of writing (late 2016). Severity is assessed according to the depth of renal parenchymal damage and involvement of the urinary collecting system a...

AAST liver injury scale

The 1994 revision of the AAST (American Association for the Surgery of Trauma) liver injury scale is the most widely used liver injury grading system at the time of writing (late 2016). Classification grade I haematoma: subcapsular, <10% surface area laceration: capsular tear, <1 cm parenc...

AAST spleen injury scale

The 1994 revision of the American Association for the Surgery of Trauma (AAST) splenic injury scale is the most widely used grading system for splenic trauma at the time of writing (late 2016). Classification grade I subcapsular haematoma <10% of surface area capsular laceration <1 cm depth...

Abdominal aortic injury

Abdominal aortic injuries are very rare and are much less common than thoracic aortic injury. Epidemiology Aortic injury occurs in <1% of blunt trauma patients, with abdominal aortic injury representing only ~5% of all aortic injuries 1. Males are more frequently injured, with the median age ...

Abdominal trauma

Abdominal trauma is usually divided into blunt and penetrating trauma. Findings of abdominal trauma haemoperitoneum splenic trauma: most common hepatic trauma renal trauma pancreatic trauma gastrointestinal tract (bowel) trauma: proximal jejunum is most commonly affected by blunt trauma,...

Acromioclavicular injury

Acromioclavicular joint injuries are common and range from a mild sprain to complete disruption of the acromioclavicular joint (ACJ) and injury to surrounding structures. Pathology Mechanism Acromioclavicular joint injuries usually occur from a direct blow or following a fall onto the should...

Acute aortic syndrome

Acute aortic syndrome (AAS) describes the presentation of patients with one of a number of life threatening aortic pathologies that give rise to aortic symptoms. The spectrum of these aortic emergencies include: aortic dissection aortic intramural haematoma penetrating atherosclerotic ulcer ...

Adrenal gland trauma

Adrenal gland trauma most commonly results from blunt force trauma. Epidemiology Adrenal gland trauma is present on 1-2% of CT imaging in blunt trauma although the occurrence is thought to be much higher as injury has been demonstrated at 28% in one autopsy series 1-4. The right adrenal glan...

Amputation

The term amputation refers to the disconnection of all or part of a limb from the body. Specifically amputation it is defined as removal of the structure through a bone. This is in contrast to disarticulation, which is removal of the structure through a joint. Terminology When due to trauma, t...

Amsterdam wrist rules

The Amsterdam wrist rules are validated clinical decision rules for determining which patients require radiographic imaging (wrist radiography) for acute wrist pain following trauma. The initial study evaluated 882 patients and were published in 2015 1. The decision rules assessed different clin...

Anatomy curriculum

The anatomy curriculum is one of our curriculum articles and aims to be a collection of articles that represent the core anatomy knowledge. General anatomy Neuroanatomy Head and neck anatomy Thoracic anatomy Abdominal and pelvic anatomy Spinal anatomy Lower limb anatomy Upper limb anato...

Anderson and D'Alonzo classification of odontoid process fracture

The Anderson and D'Alonzo classification is the most commonly used classification of fractures of the odontoid process of C2. Classification type I rare fracture of the upper part of the odontoid peg above the level of the transverse band of the cruciform ligament usually considered stable...

Ankle fractures

Ankle fractures account for ~10% of fractures encountered in trauma, preceded only in incidence by proximal femoral fractures in the lower limb. They have a bimodal presentation, involving young males and older females. Ankle injuries play a major part in post multitrauma functional impairment t...

Anterior cruciate ligament avulsion fracture

Anterior cruciate ligament (ACL) avulsion fractures or tibial eminence avulsion fractures are a type of avulsion fracture of the knee. This typically involves separation of the tibial attachment of the ACL to variable degrees. Separation at the femoral attachment is rare 5. Epidemiology It is ...

Anterior dislocation of the hip

Anterior hip dislocation is much less common than a posterior hip dislocation. It constitutes for only 5-18% of all hip dislocations. Pathology While the posterior dislocation is often associated with fractures, the anterior dislocation is mostly an isolated injury 1. Subtypes It can be clas...

Anterior shoulder dislocation

Anterior shoulder dislocation is by far the commonest type of dislocation and usually results from forced abduction, external rotation and extension 1. Epidemiology Broadly speaking, anterior shoulder dislocations occur in a bimodal age distribution. The first, and by far the more prevalent a...

Anterior subluxation of cervical spine

Anterior subluxation of cervical spine (also known as hyperflexion sprain) is a ligamentous injury to the cervical spine. Clinical presentation Patient presents with neck pain. There may be symptoms due to spinal cord oedema. Pathology It results from ligamentous injury, however, there may b...

Anterior superior iliac spine avulsion injury

Anterior superior iliac spine (ASIS) avulsion injuries typically occur in athletes during forceful muscular contraction. ASIS is the site of attachment for sartorius and tensor fascia latae muscles. Pathology ASIS avulsion, like other pelvic avulsion injuries, is a stable fracture. Treatment...

Aortic isthmus

The aortic isthmus is the part of the aortic arch just distal to the origin of the left subclavian artery at the site of the ductus arteriosus. This portion of the aorta is partly constricted in the fetus because of the lack of flow within the aortic sac and ascending aorta. It marks the partia...

Aortic pseudoaneurysm

Aortic pseudoaneurysms typically occur as a result of trauma. They can be acute or chronic. Pathology Aortic pseudoaneurysms are contained ruptures of the aorta in which the majority of the aortic wall has been breached, and luminal blood is held in only by a thin rim of the remaining wall or ...

Apophyseal avulsion fractures of the pelvis and hip

Apophyseal avulsion fractures of the pelvis and hip are relatively common among physically active adolescents and young adults. Epidemiology Pelvic and hip apophyseal injuries typically occur in the 14 to 25 year age range. Kicking sports, such as soccer, and gymnastics are frequently to blame...

Atlanto-axial subluxation

Atlanto-axial subluxation is a disorder of C1-C2 causing impairment in rotation of the neck. The anterior facet of C1 is fixed on the facet of C2. It may be associated with dislocation of the lateral mass of C1 on C2. Pathology Aetiology congenital os odontoideum Down syndrome (20%) Morqui...

Aubergine sign (penis)

The aubergine sign (also known as egg-plant sign or deformity) is a clinical sign of a fractured penis. Haemorrhage beyond the tunica albuginea produces swelling and bruising of the penis simulating the appearance of an aubergine.

Aviator fracture

An aviator fracture is a coronal-plane fracture of the neck of the talus resulting from forced dorsiflexion of ankle. It is the second most common talar fracture, after talar dome fractures. In 20% of cases a fracture of the medial malleolus is also present 1. These fractures are at risk of av...

Avulsion fracture of the 5th metatarsal styloid

Avulsion fracture of the 5th metatarsal styloid, also known as a pseudo-Jones fracture, is one of the more common foot avulsion injuries, and accounts for over 90% of fractures of the base of the 5th metatarsal. Despite what should be a simple entity, controversy exists, as well as confusion in...

Avulsion fractures of the knee

Avulsion fractures of the knee are numerous due to the many ligaments and tendons inserting around this joint. They include 1: anterior cruciate ligament avulsion fracture posterior cruciate ligament avulsion fracture avulsion of the medial collateral ligament origin of MCL avulsion fracture...

Avulsion injuries

Avulsion injuries, where a portion of cortical bone is ripped from the rest of the bone by the attached tendon, are common among those who participate in sports, and there are numerous sites at which these occur. Being familiar with them is important as chronic injuries can appear aggressive. S...

Banana fracture

A banana fracture refers to a complete, horizontally oriented pathological fracture seen in deformed bones affected by Paget disease. This term is often used to describe incremental fractures that occur in Paget disease as well, which represent a type of insufficiency fracture. The former of th...

Barton fracture

Barton fractures are fractures of the distal radius. It is also sometimes termed the dorsal type Barton fracture to distinguish it from the volar type or reverse Barton fracture. Barton fractures extend through the dorsal aspect to the articular surface but not to the volar aspect. Therefore, i...

Bennett fracture dislocation

A Bennett fracture-dislocation is a fracture of the thumb resultant of forced abduction of the first metacarpal. Defined as an intra-articular two-part fracture of the base of the first metacarpal bone. Radiographic features Plain radiograph two piece fracture dislocation of the base of the t...

Biffl scale for blunt cerebrovascular injury

The Biffl scale or grade illustrates the spectrum of blunt cerebrovascular injury (BCVI) seen on angiography (both CTA and DSA). Some authors refer to the grading scale as the Denver scale, which is not to be confused with the Denver criteria, a set of clinical and risk factors for BCVI. Class...

Bilateral facet dislocation

Bilateral facet dislocation is a flexion distraction type of dislocation. Pathology Mechanism It has been thought to result from hyperflexion, however, recent studies suggest a buckling force to be the cause 1. Radiographic features loss of apposition at facet joint: bilateral facet joints ...

Birth fracture of the clavicle

Birth fractures of the clavicle occur in 0.5-1% of vaginal deliveries and are the most frequent birth-related fracture. They are most commonly seen following normal, uncomplicated births but there is recognised increased incidence with high birth weight babies, forceps delivery and shoulder dyst...

Birth trauma

Birth trauma relates to those conditions caused by both physical/mechanical and hypoxic injuries. Epidemiology Birth trauma occurs in ~5 per 1000 births 2. Pathology Aetiology There are a wide range of conditions related to birth trauma, ranging from superficial and minor injuries through t...

Blunt cerebrovascular injury

Blunt cerebrovascular injury (BCVI) is an uncommon but serious consequence of blunt trauma to the head and neck. Epidemiology It is often part of multi-trauma with a significant series of blunt trauma CTA reporting an incidence of approximately 1% 3. A large systematic review and meta-analysis...

Blunt traumatic neck injury

Blunt traumatic neck injury is uncommon because it is usually protected by the head, shoulders, and chest. This term is generally used to refer to injuries of the neck besides to cervical spine injuries, which are common. Pathology Blunt injury to the neck is most commonly from motor vehicle ...

Bosworth fracture

The term Bosworth fracture is no longer used. However, it was classically used to refer to a fracture-dislocation of the ankle in which there was fracture of the fibula and posterior dislocation of the talus. History and etymology Named after David M Bosworth (1897-1979), orthopaedic surgeon f...

Bowel and mesenteric trauma

Bowel and mesenteric trauma can result from blunt force, penetrating and iatrogenic trauma. Epidemiology The bowel and mesentery are injured in ~2.5% (range 0.3-5%) of blunt force abdominal trauma 1,3,5,8. However, bowel and mesenteric injuries are more likely to occur after penetrating trauma...

Bowing fracture

Bowing fractures are incomplete fractures of tubular long bones in paediatric patients (especially the radius and ulna) that often require no intervention and heal with remodelling. Epidemiology Bowing fractures are almost exclusively found in children. However, there have been several case re...

Boxer fracture

Boxer fractures are minimally comminuted, transverse fractures of the 5th metacarpal and are the most common type of metacarpal fracture. They typically occur (as the name suggests) when punching and are a common sight in all emergency departments on Friday nights. They should not be confused w...

Brachial plexus injuries

Brachial plexus injuries are a spectrum of upper limb neurological deficits secondary to partial or complete injury to the brachial plexus, which provides the nerve supply of upper limb muscles. Clinical presentation Trauma, usually by motor vehicle accidents, involves severe traction on the ...

Bronchial fracture (mnemonic)

A mnemonic for the features of a bronchial fracture on a chest radiograph is: PPP Mnemonic P: progressive or P: persistent pneumothorax or P: pneumomediastinum

Bucket handle fracture (disambiguation)

Bucket handle fracture may refer to: bucket handle fracture - non-accidental injury bucket handle fracture of the pelvis

Burst fracture

Burst fractures are a type of compression fracture related to high-energy axial loading spinal trauma that results in disruption of the posterior vertebral body cortex with retropulsion into the spinal canal. Clinical presentation They usually present as back pain and or lower limbs neurologi...

Butterfly fragment (fracture)

Butterfly fragments are large, triangular fracture fragments seen commonly in comminuted long bone fractures. The term is commonly used in orthopaedic surgery, and results from two oblique fracture lines meeting to create a large triangular or wedge-shaped fragment located between the proximal a...

Calcaneal fracture

Calcaneal fractures are the most common tarsal fracture, and can occur in a variety of settings. Epidemiology The calcaneus is the most commonly fractured tarsal bone and accounts for about 2% of all fractures 2 and ~60% of all tarsal fractures 3. Pathology Calcaneal fractures can be divided...

Calcaneal tuberosity avulsion fracture

Avulsion fractures of the calcaneal tuberosity are rare, accounting for only 3% of all calcaneal fractures. There is a strong association with diabetes, where they may occur spontaneously, and are thought to be due to peripheral neuropathy. They also occur in osteoporosis and hyperparathyroidism...

Caroticocavernous fistula

Caroticocavernous fistulas (CCF) represent abnormal communication between the carotid circulation and the cavernous sinus. They can be classified as direct or indirect which are separate conditions with different aetiologies. Epidemiology Direct CCFs are often secondary to trauma, and as suc...

Carpometacarpal joint dislocation

Carpometacarpal (CMC) joint dislocations are an uncommon dislocation of the hand. Epidemiology There is a strong younger male predominance in the dominant hand. Clinical presentation The most common mechanisms of injury are punching followed by a fall. The patient may present with ulnar dev...

Central cord syndrome

Central cord syndrome is the most common type of incomplete spinal cord injury, accounting for ~10% of all spinal cord injuries. As the name implies, this syndrome is the result of a contusion of the central portion of the cervical spinal cord. Epidemiology Most often central cord syndrome occ...

Cerebral haemorrhagic contusion

Cerebral haemorrhagic contusions are a type of intracerebral haemorrhage and are common in the setting of significant head injury. They are usually characterised on CT as hyperdense foci in the frontal lobes adjacent to the floor of the anterior cranial fossa and in the temporal poles. Epidemio...

Cerebral herniation

Cerebral herniation, also referred to as acquired intracranial herniation, refers to shift of cerebral tissue from its normal location, into an adjacent space as a result of mass effect. Pathology There are a number of different patterns of cerebral herniation which describe the type of herni...

Cerebral ring enhancing lesions (mnemonic)

Convenient mnemonics for the causes of cerebral ring enhancing lesions are: MAGIC DR or DR MAGIC DR MAGIC L MAGICAL DR Mnemonics MAGIC DR or DR MAGIC M: metastasis A: abscess G: glioblastoma I: infarct (subacute phase) C: contusion D: demyelinating disease R: radiation necrosis or re...

Cervical spine floating pillar

A floating pillar, also referred as pedicolaminar fracture-separation injury, is characterised by fractures through the pedicle and lamina of a cervical spine vertebrae creating a free-floating articular pillar fragment. It is an unstable cervical spine fracture that results from hyperflexion–la...

Cervical spine fracture classification systems

There are several cervical spine fracture classification systems: Anderson and D'Alonzo classification (odontoid fracture) Roy-Camille classification (odontoid fracture) Levine and Edwards classification (for traumatic injuries to axis) Allen and Ferguson classification (subaxial spine inju...

Cervical spine fractures

Cervical spine fractures can occur secondary to exaggerated flexion or extension, or because of direct trauma or axial loading. Pathology The cervical spine is susceptible to injury because it is highly mobile with relatively small vertebral bodies and supports the head which is both heavy and...

Cervical spine injury

Cervical spine injuries can involve the cervical vertebral column, intervertebral discs and cervical spine ligaments, and/or cervical spinal cord. The cervical spine accounts for ~50% of all spinal injuries. Epidemiology 5-10% of patients with blunt trauma have a cervical spine injury 1. Pa...

Chalk stick fracture

Chalk stick or carrot stick fractures are fractures of a fused spine, classically seen in ankylosing spondylitis. Terminology Some authors define the chalk stick fracture as a fracture through a Pagetoid long bone (see Paget disease). Pathology They usually occur through the disco-vertebral ...

Chance fracture

Chance fractures, also referred as seatbelt fractures, are flexion-distraction type injuries of the spine that extend to involve all three spinal columns. These are unstable injuries and have a high association with intra-abdominal injuries. Pathology Mechanism They tend to occur from a flexi...

Chauffeur fracture

Chauffeur fractures (also known as Hutchinson fractures or backfire fractures) are intra-articular fractures of the radial styloid process. The radial styloid is within the fracture fragment, although the fragment can vary markedly in size. Pathology Mechanism These injuries are sustained eit...

Chopart fracture

Chopart fracture is a fracture/dislocation of the mid-tarsal joint (Chopart joint) of the foot, i.e. talonavicular and calcaneocuboid joints which separate the hindfoot from the midfoot. The commonly fractured bones are the calcaneus, cuboid and navicular. The foot is usually dislocated mediall...

Classification of gamekeeper thumb

This classification of gamekeeper thumb (also known as skier thumb) was proposed by Hintermann et al 1 in 1993 and is based on whether a fracture is present and whether the injury is stable: type I fracture present, which is non-displaced and stable in flexion typically treated with a splint/...

Classification of sacral fractures

There are several classification systems for sacral fractures, but the most commonly employed are the Denis classification and subclassification systems, and the Isler classification system. These classification systems are important to understand as proper classification can impact management. ...

Clavicular fracture

Clavicular fractures are common and account for 2.6-10% of all fractures 2-3. They usually require minimal treatment, which relies on analgesia and a collar-and-cuff. However, in some cases open reduction and internal fixation is required. Mechanism Fractures can occur at any part of the clavi...

Clay-shoveler fracture

Clay-shoveler fractures are fractures of the spinous process of a lower cervical vertebra. Clinical presentation Often these injuries are unrecognised at the time and only found incidentally years later when the cervical spine is imaged for other reasons. Acutely they tend to be associated wi...

Colles fracture

Colles fractures are very common extra-articular fractures of the distal radius that occur as the result of a fall onto an outstretched hand. They consist of a fracture of the distal radial metaphyseal region with dorsal angulation and impaction, but without an involvement of the articular surfa...

Comminuted fracture

Comminuted fractures are fractures where more than 2 bone components are created. The problem with the term is that it includes a very heterogeneous group of fractures from a 3 part humeral head fracture to a multi-part fracture of the femur following a high-energy road traffic accident.

Complete fracture

Complete fractures are fractures where the parts of the bone that have been fractured are completely separated from each other. There is complete separation of the cortex circumferentially. Complete fractures can be classified as: transverse: straight across the bone oblique: oblique line acr...

Complex midfacial fracture

Complex midfacial fractures consist of multiple facial fractures that cannot be classified as any of the known complex facial fracture (e.g. Le Fort, zygomaticomaxillary complex fracture, naso-orbital-ethmoid fracture).

Complications of petrous temporal bone fracture (mnemonic)

A handy mnemonic to recall the complications of transverse and longitudinal petrous temporal bone fractures is: listen carefully to something funny Mnemonic listen carefully = longitudinal / conductive hearing loss to something funny = transverse / sensorineural hearing loss and facial nerve...

Condylar process fractures

Condylar process fractures are fractures of the condylar process of the mandible. The condylar process of the mandible is involved in around 30% of all mandibular fractures. Condylar fractures are classified according to the location of the fracture and the direction displacement of the condyle...

Congenital insensitivity to pain

Congenital insensitivity to pain (CIP) refers to group of rare hereditary sensory and autonomic neuropathies (HSANs) characterised by an inability to feel pain 1. Terminology Although not clearly defined in the literature, CIP is not one specific diagnosis, but describes symptoms common to man...

Coraco-clavicular ligament injury

Coracoclavicular (CC) ligament injury is common with shoulder trauma. It is considered part of the spectrum of acromioclavicular joint injuries 2 and is not often an isolated injury. It is also often injured with clavicular fractures. This injury is easy to miss, especially with presence of an...

Coracoid process fracture

Coracoid process fractures are an uncommon type of scapular fracture. They do not often occur in isolation and are often associated with acromial, clavicular, or scapular fracture, as well as humeral head dislocation. In general, the coracoid process tends to fracture at its base and be minimal...

Costal cartilage fracture

Costal cartilage fractures are fractures of the cartilage connecting the ribs anteriorly to the sternum. Epidemiology There is little published data on costal cartilage fractures. Most reported cases are in males and resulted from blunt trauma or a fall 1,2. Clinical presentation In young ch...

Coup-contrecoup injury

A coup-contrecoup injury is a term applied to head injuries and most often cerebral contusions. It refers to the common pattern of injury whereby damage is located both at the site of impact (often less marked) and on the opposite side of the head to the point of maximum external trauma. The im...

Cranial gun shot injuries

Cranial gun shot injuries are a form of penetrating traumatic brain injuries, which are much less common than blunt traumatic brain injuries. Epidemiology Incidence of gun shot injuries to the head is increasing in some countries, due to the ease of accessibility of firearms. In the civilian ...

CT abdomen (summary)

CT abdomen is an increasingly common investigation that is used to help make diagnoses of a broad range of pathologies. A CT abdomen in its simplest form is a CT from diaphragm to symphysis performed 60 seconds after pump-injection of iodinated contrast intro a peripheral vein. However, dependin...

CT comma sign

The CT comma sign is a characteristic sign seen in head trauma. It is the presence of concurrent epidural and subdural haematomas, which gives the characteristic appearance of this sign as a "comma" shape.

CT cystography

CT cystography is a variation of the traditional fluoroscopic cystogram. Instead of anterograde opacification of the urinary collecting system (as with CT urography), contrast is instilled retrograde into the patient's bladder, and then the pelvis is imaged with CT. Indications suspected bladd...

CT hypotension complex

CT hypotension complex refers to the predominantly abdominal imaging features that occur in the context of profound hypotension. Multiple abdominal organs can display atypical appearances not related to the initial trauma but reflect alterations in perfusion secondary to hypovolemia which affect...

CT polytrauma

CT polytrauma/multitrauma (also called trauma CT) is an increasingly used test in the patient with multiple injuries sustained after significant trauma. There is some evidence that trauma patients who undergo whole body CT (WBCT) / panscan have better survival than patients who undergo selectiv...

Deep sulcus sign

The deep sulcus sign on a supine chest radiograph is an indication of a pneumothorax. In a supine film (common in the ICU), it may be the only indication of a pneumothorax because air collects anteriorly and basally, within the nondependent portions of the pleural space, as opposed to the apex ...

Degloving bowel injury

Degloving bowel injuries are a rare type of bowel and mesenteric injury only being described a handful of times in the literature 1-5. In these injuries the bowel is stripped of its mesentery and muscle, leaving a "mucosal tube" 2,3. Perforation may or may not be present. See also degloving i...

Degloving injury

Degloving injuries can refer to a number of conditions: degloving soft tissue injury Morel-Lavallee lesion (closed degloving soft tissue injury) intramuscular degloving injury degloving bowel injury

Degloving soft tissue injury

Degloving soft tissue injuries can be extensive and quite severe conditions. These may be open or, less commonly, closed injuries, which are known as Morel-Lavallee lesions. This article focuses on open injuries with closed injuries discussed in the Morel-Lavallee lesion article. Terminology ...

Deltoid ligament injury

Deltoid ligament injuries involve the deltoid ligament that forms the medial part of the ankle joint. It attaches the medial malleolus to multiple tarsal bones. Pathology Mechanism of injury It occurs due to eversion and/or pronation injury, or can be associated with lateral ankle fractures. ...

Denver criteria for blunt cerebrovascular injury

The Denver criteria are a set of screening criteria for blunt cerebrovascular injury (BCVI) in trauma used to reduce the need for CT angiography and its associated radiation exposure. Screening criteria The screening protocol criteria 1,3 for BCVI are divided into signs and symptoms of BCVI a...

Depressed skull fracture

Depressed skull fractures result in the bone of the skull vault being folded (depressed) inward into the cerebral parenchyma. It is usually the result of a high energy impact to the skull. Pathology These mostly (~75%) occur in the frontoparietal region 3. Associations There are number of as...

Describing a fracture (an approach)

Describing a fracture is a basic requirement when making an assessment of a plain radiograph. There are many ways to approach the assessment of the radiograph; this is just one approach. I: Describe the film What film (or films) are you looking at? Check the who, what, why, when and where. II...

Diaphragmatic rupture

Diaphragmatic rupture often results from blunt abdominal trauma, which is usually associated with motor-vehicle accidents and hence a predominance of young males. Epidemiology Estimated incidence is ~4.5% (range 0.8-8%) of patients who sustain blunt abdominal or lower thoracic trauma 1-2; the ...

Die-punch fracture

A die-punch fracture results from axial loading forces on the distal radius. It is an intra-articular fracture of the lunate fossa of the distal radius. It may be depressed. See also distal radius fracture upper limb fractures

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