For the surname, see Ricketts.
|Symptoms||Bowed legs, stunted growth, bone pain, large forehead, trouble sleeping|
|Complications||Bone fractures, muscle spasms, abnormally curved spine, intellectual disability|
|Causes||Diet without enough vitamin D or calcium, too little sun exposure, exclusive breastfeeding without supplementation, celiac disease, certain genetic conditions|
|Diagnostic method||Blood tests, X-rays|
|Differential diagnosis||Fanconi syndrome, scurvy, Lowe syndrome, osteomalacia|
|Prevention||Vitamin D supplements for exclusively-breastfed babies|
|Treatment||Vitamin D and calcium|
|Frequency||Relatively common (Middle East, Africa, Asia)|
Rickets is a condition that results in weak or soft bones in children.
The most common cause of rickets is a vitamin D deficiency.
This can result from eating a diet without enough vitamin D, dark skin, too little sun exposure, exclusive breastfeeding without vitamin D supplementation, celiac disease, and certain genetic conditions.
Prevention for exclusively breastfed babies is vitamin D supplements.
Otherwise, treatment depends on the underlying cause.
If due to a lack of vitamin D, treatment is usually with vitamin D and calcium.
This generally results in improvements within a few weeks.
Bone deformities may also improve over time.
Occasionally surgery may be done to correct bone deformities.
Genetic forms of the disease typically require specialized treatment.
Rickets occurs relatively commonly in the Middle East, Africa, and Asia.
It is generally uncommon in the United States and Europe, except among certain minority groups.
It begins in childhood, typically between the ages of 3 and 18 months old.
Rates of disease are equal in males and females.
Cases of what is believed to have been rickets have been described since the 1st century, and the condition was widespread in the Roman Empire.
The disease was common into the 20th century.
Early treatments included the use of cod liver oil.
Signs and symptoms
Early skeletal deformities can arise in infants such as soft, thinned skull bones – a condition known as craniotabes, which is the first sign of rickets; skull bossing may be present and a delayed closure of the fontanelles.
The pelvic bones may be deformed.
This appears as a visible bump in the middle of each rib in a line on each side of the body.
This somewhat resembles a rosary, giving rise to its name.
The deformity of a pigeon chest may result in the presence of Harrison's groove.
Dental problems can also arise.
Changes in the skull also occur causing a distinctive "square headed" appearance known as "caput quadratum".
These deformities persist into adult life if not treated.
Long-term consequences include permanent curvatures or disfiguration of the long bones, and a curved back.
Maternal deficiencies may be the cause of overt bone disease from before birth and impairment of bone quality after birth.
The primary cause of congenital rickets is vitamin D deficiency in the mother's blood, which the baby shares.
Vitamin D ensures that serum phosphate and calcium levels are sufficient to facilitate the mineralization of bone.
Rickets in children is similar to osteoporosis in the elderly, with brittle bones.
Pre-natal care includes checking vitamin levels and ensuring that any deficiencies are supplemented.
Also exclusively breast-fed infants may require rickets prevention by vitamin D supplementation or an increased exposure to sunlight.
In sunny countries such as Nigeria, South Africa, and Bangladesh, there is sufficient endogenous vitamin D due to exposure to the sun.
However, the disease occurs among older toddlers and children in these countries, which in these circumstances is attributed to low dietary calcium intakes due to a mainly cereal-based diet.
Those at higher risk for developing rickets include:
- Breast-fed infants whose mothers are not exposed to sunlight
- Breast-fed infants who are not exposed to sunlight
- Breast-fed babies who are exposed to little sunlight
- Adolescents, in particular when undergoing the pubertal growth spurt
- Any child whose diet does not contain enough vitamin D or calcium
Strontium is allied with calcium uptake into bones; at excessive dietary levels strontium has a rachitogenic (rickets-producing) action.
Sunlight, especially ultraviolet light, lets human skin cells convert vitamin D from an inactive to active state.
Foods that contain vitamin D include butter, eggs, fish liver oils, margarine, fortified milk and juice, portabella and shiitake mushrooms, and oily fishes such as tuna, herring, and salmon.
A rare X-linked dominant form exists called vitamin D-resistant rickets or X-linked hypophosphatemia.
Cases have been reported in Britain in recent years of rickets in children of many social backgrounds caused by insufficient production in the body of vitamin D because the sun's ultraviolet light was not reaching the skin due to use of strong sunblock, too much "covering up" in sunlight, or not getting out into the sun.
Other cases have been reported among the children of some ethnic groups in which mothers avoid exposure to the sun for religious or cultural reasons, leading to a maternal shortage of vitamin D; and people with darker skins need more sunlight to maintain vitamin D levels.
Rickets had historically been a problem in London, especially during the Industrial Revolution.
Persistent thick fog and heavy industrial smog permeating the city blocked out significant amounts of sunlight to such an extent that up to 80 percent of children at one time had varying degrees of rickets in one form or the other.
It is sometimes known "the English Disease" in some foreign languages (e.g. German: 'Die englische Krankheit', Dutch: 'Engelse ziekte', Hungarian: "angolkór").
Vitamin D natural selection hypotheses: Rickets is often a result of vitamin D3 deficiency.
The correlation between human skin color and latitude is thought to be the result of positive selection to varying levels of solar ultraviolet radiation.
Northern latitudes have selection for lighter skin that allows UV rays to produce vitamin D from 7-dehydrocholesterol.
Conversely, latitudes near the equator have selection for darker skin that can block the majority of UV radiation to protect from toxic levels of vitamin D, as well as skin cancer.
An anecdote often cited to support this hypothesis is that Arctic populations whose skin is relatively darker for their latitude, such as the Inuit, have a diet that is historically rich in vitamin D. Since these people acquire vitamin D through their diet, there is not a positive selective force to synthesize vitamin D from sunlight.
Environment mismatch: Ultimately, vitamin D deficiency arises from a mismatch between a population's previous evolutionary environment and the individual's current environment.
This risk of mismatch increases with advances in transportation methods and increases in urban population size at high latitudes.
Similar to the environmental mismatch when dark-skinned people live at high latitudes, Rickets can also occur in religious communities that require long garments with hoods and veils.
These hoods and veils act as sunlight barriers that prevent individuals from synthesizing vitamin D naturally from the sun.
In a study by Mithal et al., Vitamin D insufficiency of various countries was measured by lower 25-hydroxyvitamin D. 25(OH)D is an indicator of vitamin D insufficiency that can be easily measured.
These percentages should be regarded as relative vitamin D levels, and not as predicting evidence for development of rickets.
Asian immigrants living in Europe have an increased risk for vitamin D deficiency.
Vitamin D insufficiency was found in 40% of non-Western immigrants in the Netherlands, and in more than 80% of Turkish and Moroccan immigrants.
The Middle East, despite high rates of sun-exposure, has the highest rates of rickets worldwide.
This can be explained by limited sun exposure due to cultural practices and lack of vitamin D supplementation for breast-feeding women.
Up to 70% and 80% of adolescent girls in Iran and Saudi Arabia, respectively, have vitamin D insufficiency.
Socioeconomic factors that limit a vitamin D rich diet also plays a role.
In the United States, vitamin D insufficiency varies dramatically by ethnicity.
Among males aged 70 years and older, the prevalence of low serum 25(OH) D levels was 23% for non-Hispanic whites, 45% for Mexican Americans, and 58% for non-Hispanic blacks.
Among women, the prevalence was 28.5%, 55%, and 68%, respectively.
A systematic review published in the Cochrane Library looked at children up to three years old in Turkey and China and found there was a beneficial association between vitamin D and rickets.
In Turkey children getting vitamin D had only a 4% chance of developing rickets compared to children who received no medical intervention.
In China, a combination of vitamin D, calcium and nutritional counseling was linked to a decreased risk of rickets.
With this evolutionary perspective in mind, parents can supplement their nutritional intake with vitamin D enhanced beverages if they feel their child is at risk for vitamin D deficiency.
Rickets may be diagnosed with the help of:
- Blood tests:
- Serum calcium may show low levels of calcium, serum phosphorus may be low, and serum alkaline phosphatase may be high from bones or changes in the shape or structure of the bones. This can show enlarged limbs and joints.
- A bone density scan may be undertaken.
- Radiography typically show widening of the zones of provisional calcification of the metaphyses secondary to unmineralized osteoid. Cupping, fraying, and splaying of metaphyses typically appears with growth and continued weight bearing. These changes are seen predominantly at sites of rapid growth, including the proximal humerus, distal radius, distal femur and both the proximal and the distal tibia. Therefore, a skeletal survey for rickets can be accomplished with anteroposterior radiographs of the knees, wrists, and ankles.
- Vitamin D-related rickets
- Vitamin D deficiency
- Vitamin D-dependent rickets (VDDR)
- Type 1: insufficiency in actication
- Type 2: resistance to calcitriol
- VDDR2A: calcitriol receptor mutation
- VDDR2B: unknown nuclear ribonucleoprotein interfering with signal transduction
- Type 3: excessive inactivation (CYP3A4 mutation, dominant)
- Hypocalcemia-related rickets
- Hypophosphatemia-related rickets
- Vitamin D-resistant rickets
- Autosomal dominant hypophosphatemic rickets (ADHR)
- Autosomal recessive hypophosphatemic rickets (ARHR)
- Hypophosphatemia (typically secondary to malabsorption)
- Fanconi's syndrome
- Secondary to other diseases
Osteochondrodysplasias also known as genetic bone diseases may mimic the clinical picture of rickets in regard to the features of bone deformities.
The radiologic picture and the laboratory findings of serum calcium, phosphate and alkaline phosphatase, are important differentiating factors.
Infants with rickets can have bone fractures.
This sometimes leads to child abuse allegations.
This issue appears to be more common for solely nursing infants of black mothers, in winter in temperate climates, suffering poor nutrition and no vitamin D supplementation.
People with darker skin produce less vitamin D than those with lighter skin, for the same amount of sunlight.
The most common treatment of rickets is the use of vitamin D. However, orthopedic surgery is occasionally needed.
Diet and sunlight
Treatment involves increasing dietary intake of calcium, phosphates and vitamin D. Exposure to ultraviolet B light (most easily obtained when the sun is highest in the sky), cod liver oil, halibut-liver oil, and viosterol are all sources of vitamin D.
A sufficient amount of ultraviolet B light in sunlight each day and adequate supplies of calcium and phosphorus in the diet can prevent rickets.
Darker-skinned people need to be exposed longer to the ultraviolet rays.
The replacement of vitamin D has been proven to correct rickets using these methods of ultraviolet light therapy and medicine.
Recommendations are for 400 international units (IU) of vitamin D a day for infants and children.
Children who do not get adequate amounts of vitamin D are at increased risk of rickets.
Vitamin D is essential for allowing the body to uptake calcium for use in proper bone calcification and maintenance.
Sufficient vitamin D levels can also be achieved through dietary supplementation and/or exposure to sunlight.
Vitamin D3 (cholecalciferol) is the preferred form since it is more readily absorbed than vitamin D2.
Endogenous production with full body exposure to sunlight is approximately 250 µg (10,000 IU) per day.
According to the American Academy of Pediatrics (AAP), all infants, including those who are exclusively breast-fed, may need vitamin D supplementation until they start drinking at least 17 US fluid ounces (500 ml) of vitamin D-fortified milk or formula a day.
Surgical correction of rachitic deformities can be achieved through osteotomies or guided growth surgery.
Guided growth surgery has almost replaced the use of corrective osteotomies.
The functional results of guided growth surgery in children with rickets are satisfactory.
While bone osteotomies work through acute/immediate correction of the limb deformity, guided growth works through gradual correction.
In developed countries, rickets is a rare disease (incidence of less than 1 in 200,000).
Recently, cases of rickets have been reported among children who are not fed enough vitamin D.
In 2013/2014 there were fewer than 700 cases in England.
In 2019 the number of cases hospitalised was said to be the highest in 50 years.
Rickets occurs relatively commonly in the Middle East, Africa, and Asia.
Greek physician Soranus of Ephesus, one of the chief representatives of the Methodic school of medicine who practiced in Alexandria and subsequently in Rome, reported deformation of the bones in infants as early as the first and second centuries AD.
Rickets was not defined as a specific medical condition until 1645, when an English physician Daniel Whistler gave the earliest known description of the disease.
In 1650 a treatise on rickets was published by Francis Glisson, a physician at Caius College, Cambridge, who said it had first appeared about 30 years previously in the counties of Dorset and Somerset.
The role of diet in the development of rickets was determined by Edward Mellanby between 1918 and 1920.
In 1923, American physician Harry Steenbock demonstrated that irradiation by ultraviolet light increased the vitamin D content of foods and other organic materials.
Steenbock's irradiation technique was used for foodstuffs, but most memorably for milk.
By 1945, rickets had all but been eliminated in the United States.
The word rickets may be from the Old English word wrickken ('to twist'), although because this is conjectured, several major dictionaries simply say "origin unknown".
The name rickets is plural in form but usually singular in construction.
The Greek word "rachitis" (ῥαχίτης, meaning "in or of the spine") was later adopted as the scientific term for rickets, due chiefly to the words' similarity in sound.
Credits to the contents of this page go to the authors of the corresponding Wikipedia page: en.wikipedia.org/wiki/Rickets.