Articles

Articles are a collaborative effort to provide a single canonical page on all topics relevant to the practice of radiology. As such, articles are written and edited by countless contributing members over a period of time. A global group of dedicated editors oversee accuracy, consulting with expert advisers, and constantly reviewing additions.

137 results found
Article

Abdominal hernia

Abdominal hernias (herniae also used) may be congenital or acquired and come with varying eponyms. They are distinguished primarily based on location and content. 75-80% of all hernias are inguinal. Content of the hernia is variable, and may include: small bowel loops mobile colon segments (s...
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Achondrogenesis 1A

Achondrogenesis type Ia, also known as the Houston-Harris subtype, is a subtype of achondrogenesis. It is an extremely rare lethal skeletal dysplasia (chondrodysplasia) with a characteristic severe disarrangement of endochondral ossification.  Pathology The growth plate cartilage completely la...
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Ahlbäck classification of osteoarthritis of the knee joint

This classification was proposed by Ahlback et al. in 1968. According to Ahlbäck system, knee joint osteoarthritis is classified as: grade 1: joint space narrowing (less than 3 mm) grade 2: joint space obliteration grade 3: minor bone attrition (0-5 mm) grade 4: moderate bone attrition (5-1...
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Allen and Ferguson classification of subaxial cervical spine injuries

Allen and Ferguson classification is used for research purposes to classify subaxial spine injuries. It is based ofn the mechanism of injury and position of the neck during injury. This classification was proposed by Allen and Ferguson in 19823 and at the time of writing (July 2016) remains the ...
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American Academy of Orthopedic Surgeons classification of periprosthetic hip fractures

The American Academy of Orthopedic Surgeons classification of periprosthetic hip fractures divides the femur into three separate regions: level I: proximal femur distally to the lower extent of the lesser trochanter  level II: 10 cm of femur distal to level I  level III: femur distal to level...
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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...
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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...
Article

Anterior cruciate ligament avulsion fracture

Anterior cruciate ligament (ACL) avulsion fracture or tibial eminence avulsion fracture is 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 mor...
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AO classification of proximal humeral fractures

The AO classification of proximal humeral fractures, along with the Neer classification, is one of the most frequently used systems for classifying proximal humeral fractures.  The AO classification divides proximal humeral fractures into three groups, A, B and C, each with subgroups, and place...
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AO classification of sacral injuries

The AO classification of sacral injuries aims to simplify and universalise the process of classifying sacral injuries and improve interobserver and intraobserver reliability. The AO sacral classification is broken into three subsections that follow a hierarchical structure similar to the AO cla...
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AO classification of subaxial injuries

The AO classification of subaxial injuries aims to simplify and universalise the classification of subaxial cervical spine fractures and improve interobserver and intraobserver reliability. The AO subaxial cervical spine injury classification involves four criteria based on morphology, facet in...
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Arnold-Hilgartner classification of haemophilic arthropathy

Arnold-Hilgartner classification is a plain radiograph grading system for haemophilic arthropathy of the knee 1,2: stage 0: normal joint stage I: no skeletal abnormalities, soft-tissue swelling is present stage II: osteoporosis and overgrowth of the epiphysis, no cysts, no narrowing of the ca...
Article

ASIA impairment scale for spinal injury

The American Spinal Injury Association (ASIA) was developed by the American Spinal Injury Association in 2006, and at the time of writing (July 2016), remains the most widely used scale. This scale is part of the ASIA spinal cord injury classification. It divides spinal cord injuries into 5 cat...
Article

Bado classification of Monteggia fracture-dislocations

The Bado classification is one of the more widely used classifications for Monteggia fracture-dislocations and mainly focuses on the radial component. Four types are recognised and are generally based on the principle that the direction in which the apex of the ulnar fracture points is the same ...
Article

Bent bone dysplasias (differential)

Bent bone dysplasias are a class of dysplasia included in a 2010 classification of genetic skeletal disorders 1. campomelic dysplasia Stuve-Weidemann dysplasia kyphomelic dysplasias, a diverse class, including congenital bowing of the long bones cartilage-hair hypoplasia (CHH; metaphyseal d...
Article

Berndt and Harty classification

Berndt and Harty classification is used for osteochondral lesions of the talus. Classification stage I: subchondral bone compression (marrow edema) stage II stage IIa: subchondral cyst stage IIb: incomplete separation of fragment stage III: complete separation but no displacement stage IV...
Article

Bone tumours

There are a bewildering number of bone tumours with a wide variety of radiological appearances: bone-forming tumours osteoid osteoma osteoblastoma osteoma osteosarcoma cartilage-forming tumours enchondroma enchondromatosis-Ollier disease Maffucci syndrome osteochondroma: hereditary mu...
Article

Brachydactyly type A1 (Farabee type)

Brachydactyly type A1 or Farabee type brachydactyly is a subtype of brachydactyly. It was the first human anomaly recognised to have a mendelian pattern of inheritance. The anomaly is characterised by hypoplasia or aplasia of middle phalanges of the second to fifth digits in hands and feet and p...
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Brachydactyly type A2 (Mohr-Wriedt type)

Brachydactyly type A2 or Mohr-Wriedt type is characterised by hypoplasia/aplasia of the second middle phalanx of the index finger, second toe and sometimes little finger. There is radial deviation of the index finger and tibial deviation of the second toe. Pathology Type A2 brachydactyly can b...
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Brachydactyly type A3

Brachydactyly type A3 is characterized by shortening of the middle phalanx of the little finger with radial deviation of distal phalanx. Slanting of the distal articular surface of the middle phalanx leads to radial deflection of the distal phalanx. However it is not always associated with clino...
Article

Brachydactyly type A4 (Temtamy type)

Brachydactyly type A4 or Temtamy type is characterised by brachymesophalangy (absent or hypoplastic middle phalanx) of the second and fifth fingers. Other less common features include club foot, clinodactyly, ulnar deviation of the second finger. Pathology Like other brachydactyly, type A4 is ...
Article

Brachydactyly type A5

Brachydactyly type A5 is characterized by absence of the middle phalanges and nail dysplasia with duplicated terminal phalanx of the thumb with resultant bifid thumb. Inheritance is suggested as autosomal dominant.  
Article

Capsulolabral insertion classification

There is variation in the relationship between the glenoid labrum and the anterior shoulder joint capsule. This has been divided into three types: Type 1: capsule inserts into the labrum proper Type 2: capsule inserts into the base of the labrum, or within 1cm of the base Type 3: capsule inse...
Article

Castellvi classification of lumbosacral transitional vertebrae

The Castellvi classification is used for lumbosacral transitional vertebra (LSTV): type I: enlarged and dysplastic transverse (at least 19 mm) Ia: unilateral Ib: bilateral type II: pseudoarticulation of the transverse process and sacrum with incomplete lumbarisation/sacralisation; enlargemen...
Article

Catterall classification of Legg-Calvé-Perthes disease

The Catterall classification is based on radiographic appearances of the epiphysis and metaphysis visible in osteonecrosis of the femoral head: Stage I bone absorption changes visible in the anterior aspect of the epiphysis of femoral head changes are visible best in frog leg lateral view no...
Article

Cervical degenerative spondylosis (grading)

Cervical degenerative disease can be graded using a very old but reliable classification given by Kellgren et al. It is based on findings on a lateral cervical spine radiograph although it can also be applied to MRI evaluation of spine. The key parameters are osteophyte formation, intervertebra...
Article

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 injur...
Article

Classification of gamekeeper thumb

This classification of gamekeeper's thumb (also known as skier's 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 sp...
Article

Classification of proximal focal femoral deficiency

Classification of proximal femoral deficiency (PFFD) can be complicated and numerous such classifications have been proposed. For a discussion of the condition refer to the article proximal focal femoral deficiency. One of the simplest and most widely used is that proposed by Aitken 1 which is ...
Article

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. ...
Article

Close reduction-internal fixation

Closed reduction-internal fixation, abbreviated to CRIF, refers to the orthopaedic operative management of a fracture (or fracture-dislocation complex) where closed reduction is performed (manipulation) and internal fixation is applied, usually in the form of K-wires to stabilise the fracture. ...
Article

Cooke and Newman classification

The Cooke and Newman classification of periprosthetic hip fractures is a modification of the Bethea classification proposed several years earlier. type I explosion type fracture, comminuted around the stem of the implant the prosthesis is always loose and the fracture is inherently unstable ...
Article

Coronoid process fracture

Fractures of the coronoid process of the ulna are uncommon and often occur in association with elbow dislocation.  Pathology Mechanism Fracture of the coronoid process is thought to result from elbow hyperextension with either avulsion of the brachialis tendon insertion, or shearing off by th...
Article

Dameron-Lawrence-Bofte classification of proximal 5th metatarsal fractures

Dameron-Lawrence-Bofte classification of proximal fifth metatarsal fractures divides fractures into three zones based on anatomy: zone 1: tuberosity of 5th metatarsal avulsion fracture of tuberosity (pseudo-jones fracture) zone 2: meta-diaphyseal junction Jones fracture zone 3: proximal dia...
Article

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
Article

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. ...
Article

Distal fibula fracture (basic)

This is a basic article for medical students and other non-radiologists Distal fibula fractures are the most common type at the ankle and are usually the result of an inversion injury with or without rotation. They are the extension of a lateral collateral ligament injury. Background Pathophy...
Article

Eaton classification of volar plate avulsion injury

This classification was proposed by Eaton and Malerich in 1980, and presently (time of writing, August 2016) along with Keifhaber-Stern classification, is the most widely accepted classification of volar plate avulsion injuries 1.  Knowledge of the orthopaedic Eaton classification is practical ...
Article

Ficat and Arlet classification of avascular necrosis of femoral head

The Ficat and Arlet classification uses a combination of plain radiographs, MRI, and clinical features to stage avascular necrosis of the femoral head. Classification stage 0 plain radiograph: normal MRI: normal clinical symptoms: nil stage I plain radiograph: normal or minor osteopenia ...
Article

Ficat classification of osteonecrosis

The Ficat classification of osteonecrosis is based on radiographic findings. In 1985 Dr Ficat published a modified version of his initial classification in 1980: Stage 0 preclinical and preradiographic diagnosis is suspected in one hip when the other has a definite disease - this is the stage...
Article

Fractures of the extremities (general rules and nomenclature)

General rules and nomenclature of fractures should be understood by, and familiar to, anyone involved in the interpretation or management of fractures of the extremities. This article covers basic nomenclature of fractures.  Classification systems Before the most appropriate treatment for a fr...
Article

Frykman classification of distal radial fractures

The Frykman classification of distal radial fractures is based on the AP appearance and encompasses the eponymous entities of Colles fracture, Smith fracture, Barton fracture, chauffeur fracture. It assesses the pattern of fractures, involvement of the radioulnar joint and presence of a distal u...
Article

Garden classification of hip fractures

The Garden classification of  subcapital femoral neck fractures is the most widely used. It is simple and predicts the development of AVN 1,2. Garden described particular femoral neck and acetabular trabeculae patterns which can assist in recognising differences within this classification system...
Article

Gartland classification of supracondylar humeral fractures

The Gartland classification of supracondylar fractures of the humerus is based on the degree and direction of displacement, and the presence of intact cortex. It applies to extension supracondylar fractures rather than the rare flexion supracondylar fracture. Classification type I: undisplaced...
Article

Genant classification of vertebral fractures

The Genant classification of vertebral fractures is based on the vertebral shape, with respect to vertebral height loss involving the anterior, posterior, and/or middle vertebral body. grade 0: normal grade 1: mild fracture, 20% to 25% loss of height grade 2: moderate fracture, 25% to 40% los...
Article

Gilula three carpal arcs

Gilula three carpal arcs refer to the alignment described on posteroanterior or anteroposterior wrist radiographs and are used to assess normal alignment of the carpus: first arc: is a smooth curve outlining the proximal convexities of the scaphoid, lunate and triquetrum second arc: traces the...
Article

Goutallier classification

The Goutallier classification is a classification system used to quantify the amount of degeneration of the rotator cuff muscles, particularly in the context of rotator cuff tendon tears. Although originally described in shoulder CT 1, it is applicable and now most commonly used in MR. It is bas...
Article

Grading of brachial plexus injuries

According to CT myelography, brachial plexus injuries can be classified into six types 1: N type: normal root sleeve and nerve roots A1 type: slightly deformed root sleeves and nerve roots as compared to unaffected site A2 type: obliteration of the tip of root sleeves and deformed thickened n...
Article

Graf method for ultrasound classification of developmental dysplasia of the hip

The Graf method for ultrasound classification system for developmental dysplasia of the hip (DDH) in infants, combines both alpha and beta angles. There are a number of additional subdivisions, which are often not used clinically.  As a general rule, the alpha angle determines the type and in s...
Article

Gustilo Anderson classification

The Gustilo Anderson classification, sometimes referred to as the Gustilo classification is the most widely accepted classification system of open (or compound) fractures. The grading system is used to guide management of compound fractures, with higher grade injuries associated with higher ris...
Article

Johansson classification

The Johansson classification of periprosthetic hip fractures was the first classification system proposed and is the simplest. It is based on the level of the fracture in relation to the prosthesis. type I: fracture proximal to the tip of the prosthesis with the stem still in contact with the m...
Article

Judet and Letournel classification for acetabular fractures

The Judet and Letournel classification is the most widely used classification of acetabular fractures. It is based on three radiographic views (anteroposterior view, obturator oblique view and Iliac oblique view)  and classifies acetabular fractures into ten major fracture patterns, which cons...
Article

Keifhaber-Stern classification of volar plate avulsion injuries of hand

This classification was proposed originally by Hastings and later modified by Keifhaber and Stern in 1998. This classification, along with the Eaton classification, is the most widely accepted classification at the time of writing (August 2016) for the management of volar plate avulsion injuries...
Article

Kellgren and Lawrence system for classification of osteoarthritis of knee

The Kellgren and Lawrence system is a common method of classifying the severity of knee osteoarthritis (OA) using five grades 1. This classification was proposed by Kellgren et al. in 1957 2 and later accepted by WHO in 1961. In applying the system, the prevalence of chronic knee pain in a post...
Article

Kuwada classification of Achilles tendon tear

The Kuwada classification of Achilles tendon tear was proposed in 1990 4 and at the time of writing (July 2016) remains the most widely used system for describing achilles tendon rupture.  Classification Achilles tendon tears may be grouped (according to severity of the tear and degree of retr...
Article

Langer Saldino syndrome

The Langer Saldino syndrome or achondrogenesis type II is a sub type of achondrogenesis. It is an extremely rare fatal skeletal dysplasia. Pathology Genetics Majority of cases are sporadic. Autosomal dominant inheritance is also another mode. There is mutation in the collagen type II gene (CO...
Article

Lateral humeral condyle fracture

Lateral humeral condyle fractures also referred to simply as lateral condyle fractures (in the appropriate context), are relatively common elbow fractures that predominantly occur in children. They may be subtle but are hugely important to diagnose in a timely manner because if they are missed, ...
Article

Lauge-Hansen classification of ankle injury

The Lauge-Hansen classification system is used for the classification of the ankle injuries based on injury mechanisms which have predictable patterns and imaging findings. Along with the Weber classification, these systems are useful tools for describing and classifying ankle injuries. Classif...
Article

Le Fort fracture classification

Le Fort fractures are fractures of the midface, which collectively involve separation of all or a portion of the midface from the skull base. In order to be separated from the skull base, the pterygoid plates of the sphenoid bone need to be involved as these connect the midface to the sphenoid b...
Article

Levine and Edwards classification

Levine and Edwards classification is used to classify hangman fractures of C2 (also known as traumatic spondylolisthesis of axis). Classification type I: fracture with <3 mm antero-posterior deviation no angular deviation type II: fracture with >3 mm antero-posterior deviation significant a...
Article

Limbus fracture types

Limbus fractures represent bony fractures of the vertebral body rim at the site of attachment of the Sharpey fibres of the intervertebral disc. They should not to be confused with a limbus vertebra. They can be classified as follows: type I: avulsions of the posterior cortical vertebral rim ty...
Article

Lodwick classification

The Lodwick classification is a system for describing the margins of a lucent/lytic bone lesion. The terms used in the description suggest the level of concern for an aggressive, and possibly malignant, process. Classification type 1: geographic 1A: thin, sclerotic margin 1B: distinct, well-...
Article

Lunate morphology

Several classification systems exist for the lunate morphology 1, 2. Classification The lunate classification proposed by Veigas et al. is arguably the most relevant 3:  type I lunates: single distal articular facet for the capitate type II lunates: additional distal articular facet medially...
Article

Magerl classification of thoracolumbar spinal fractures

The Magerl classification of thoracolumbar spinal fractures is based on the three column concept by Denis, and the McAfee classification. It relies exclusively on CT findings. Classification A: compression injuries A1: impaction fractures A1.1: endplate impaction A1.2: wedge impaction A1.3...
Article

Main differentials in musculoskeletal imaging

Here is a list of some of the most useful differential diagnoses in musculoskeletal imaging. By process lucent/lytic bone lesions (FEGNOMASHIC) multiple lucent/lytic bone lesions benign lytic bone lesions in patients under 30 diffuse bony sclerosis permeative process in bone pseudo-permea...
Article

Mason classification of radial head fractures

The Mason classification is used to classify radial head fractures and is useful when assessing further treatment options 1-2. type I: non-displaced radial head fractures (or small marginal fractures), also known as a "chisel" fracture type II: partial articular fractures with displacement (>2...
Article

Mayfield classification of carpal instability (perilunate instability)

Mayfield classification of carpal instability, also known as perilunate instability classification (carpal dislocations), describes carpal ligament injuries.  Instability has been divided into four stages 1-2: stage I: scapholunate dissociation (rotatory subluxation of the scaphoid) disruptio...
Article

Mayo classification of scaphoid fractures

Mayo classification of scaphoid fractures divides them into three types according to the anatomic location of the fracture line: middle (70%) distal (20%) proximal (10%) Fractures of the distal third are further divided into distal articular surface and distal tubercle fractures: distal tub...
Article

McAfee classification of thoracolumbar spinal fractures

McAfee classification of acute traumatic spinal injuries is based on the three column concept of the spine. CT is needed for accurate assessment. Classification wedge compression: isolated anterior column compression  stable burst: anterior and middle column compression but posterior column i...
Article

Medial collateral ligament injury grading

Medial collateral ligament (MCL) injuries are graded into three groups on MRI, much in the same way as many other ligaments: grade 1: (minor sprain) high signal is seen medial (superficial) to the ligament, which looks normal grade 2: (severe sprain or partial tear) high signal is seen medial ...
Article

Mellado-Bencardino classification of Morel-Lavallée lesions

The Mellado-Bencardino classification of Morel-Lavallée lesions is based on shape, signal and enhancement characteristics, and the presence or absence of a capsule 1:  type I: laminar shaped and seroma-like with increased T2 signal type II: oval-shape that resembles a subacute hematoma with in...
Article

Metaphyseal diaphyseal angle

The metaphyseal-diaphyseal angle (of Drennan) is an important measurement used to distinguish between tibia vara (Blount disease) and physiological bowleg.  This angle is measured by drawing a line along the long axis of the tibia, creating a perpendicular to this line, and drawing another line...
Article

Milch classification of lateral humeral condyle fractures

The Milch classification is one of the classificaiton systems that can be used for lateral humeral condyle fractures and splits these fractures into two groups depending on their relationship with the trochlear groove: type I: fracture passes lateral to the trochlear groove type II: fracture p...
Article

Mitchell classification of avascular necrosis

Mitchell classification of avascular necrosis is based on MRI signal characteristics within the centre of the lesion on T1 and T2-weighted images. Classification The lesion is classified into four stages with stage A representing early disease and stage D representing late disease. However, th...
Article

Modified Noyes grading of chondromalacia

The modified Noyes grading of chondromalacia was published in 2009 and is divided into four grades by MRI, typically using fat saturated proton density sequences. The original Noyes grading system was based on arthroscopic findings. Classification grade 0: normal cartilage grade 1: increased ...
Article

Modified Outerbridge grading of chondromalacia

The modified Outerbridge grading of chondromalacia is divided into four grades by MRI, typically using fat saturated proton density sequences. This grading system was originally devised for arthroscopy initially for assessment of chondromalacia patella, but then modified and extended for all cho...
Article

MRI classification system for lumbar disc degeneration

Disc degeneration can be graded on MRI T2 spin-echo weighted images using a grading system proposed by Pfirrmann 1. This classification is not used on routine spine reports, being more important for research purposes. grade I: disc is homogeneous with bright hyperintense white signal intensity ...
Article

MRI grading system for meniscal signal intensity

MRI grading system for abnormal high meniscal signal intensity was reported by Lotysch et al. MR grades 1, 2 and 3 have been used: grade 1: small focal area of hyperintensity, no extension to the articular surface grade 2: linear areas of hyperintensity, no extension to the articular surface ...
Article

Mueller-Weiss syndrome (classification)

Mueller Weiss syndrome refers to a spontaneous adult onset osteonecrosis of the tarsal navicular. This syndrome is multifactorial and related to chronic loading on a suboptimally ossified navicular bone which is susceptible to central osteonecrosis due to its centripetal blood supply. It is dist...
Article

Neer classification of proximal humeral fractures

The Neer classification of proximal humeral fractures is probably the most frequently used along with the AO classification of proximal humeral fractures. Even if an exact knowledge of this classification system is beyond the everyday use of many radiologists, the terminology and factors which i...
Article

Nerve injury classification

Nerve injury classification describes the various features of nerve injury on MRI with respect to pathological events. Classification neuropraxia grade I: there is increased T2/STIR signal in the nerve, however the muscle appears normal axonotmesis grade II: increased T2/STIR signal in ne...
Article

Normal bone marrow signal of the clivus

Bone marrow signal of the clivus changes predictably with age and is well assessed with midline T1 non-fat-saturated, non-contrast images. As is seen in the rest of the body the proportion of yellow (fatty) marrow increases with age. Knowledge of these changes allows diagnosis of the abnormal cl...
Article

Occipital condyle fracture

Occipital condylar fractures result from high-energy blunt trauma and is a specific and localized type of basilar skull fracture. Epidemiology The exact incidence of these fractures is unknown but are reported to occur in 3-4% patients with moderate-severe traumatic brain injuries 3. Clinical...
Article

Odontoid fracture

Odontoid process fracture, also known as the peg or dens fracture, occurs where there is a fracture through the odontoid process of C2. Pathology The mechanism of injury is variable, and can occur both during flexion or extension with or without compression 5. Classification There are two cl...
Article

Open book pelvic injury

Open book pelvic injuries are most often the result of high-energy trauma and are associated with significant morbidity and mortality due to associated vascular injuries.  Pathology Open book pelvic injuries result from an anteroposterior compression injury to the pelvis and result in a combin...
Article

Orthoroentgenogram

Orthoroentgenogram is a radiographic study used to evaluate anatomic leg length and calculate leg-length discrepancies. This study utilises a long ruler placed on the film, and three radiographs including bilateral hips, knees and ankles. Similar studies used to evaluate true leg length include...
Article

Osteoarthritis of the hip (grading)

Osteoarthritis of the hip can be graded according to severity on imaging. Conventional radiograph grading grade 0: normal grade 1: possible joint space narrowing and subtle osteophytes grade 2: definite joint space narrowing, defined osteophytes and some sclerosis, especially in the acetabul...
Article

Osteochondral injury staging

Osteochondral injury staging system for MRI attempts to grade the stability and severity of osteochondral injury and is used to plan management. stage I injury limited to articular cartilage MRI findings: subchondral oedema x-ray findings: none stage II cartilage injury with associated sub...
Article

Osteochondritis dissecans (surgical staging)

Osteochondritis dissecans can be classified at surgery into 4 stages: stage I stable lesion in continuity with the host bone covered by intact cartilage stage II stable on probing partial discontinuity of the lesion from the host bone stage III unstable on probing fragment not dislocat...
Article

Osteogenesis imperfecta classification

The several forms of osteogenesis imperfecta (OI) have been classified, representing wide variation in appearance and severity, and clinical features vary widely not only between types but within types. Classification Osteogenesis imperfecta was initially classified by type according to a sche...
Article

Palmer classification of TFCC abnormalities

Palmer classification for triangular fibrocartilage complex (TFCC) abnormalities is based on the cause, location and degree of injury 1: Class 1 - traumatic injury a: central perforation b: ulnar avulsion with or without distal ulnar fracture may involve the proximal or distal lamina (foveal...
Article

Pathological fracture risk (Harrington criteria)

Harrington criteria can be used to predict which skeletal metastases are at high risk of pathological fracture and should undergo prophylactic internal fixation. It preceded the Mirel classification for impending pathological fracture but has not been validated and its use is debated. Classific...
Article

Pathological fracture risk (Mirel classification)

Mirel classification is a system used to predict the highest risk of pathological fracture among bones affected by metastases. Classification 1 point upper limb involving <1/3 of bone diameter blastic/sclerotic lesion mild pain 2 points lower limb involving 1/3-2/3 of bone diameter mix...

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