Rickets is a childhood metabolic bone disorder characterized by the softening and weakening of bones. It occurs specifically in growing children because their epiphyseal plates, also known as growth plates, are still open and actively developing. When the body lacks essential minerals like calcium and phosphorus, the newly formed bone matrix fails to harden properly. This leaves the growing skeleton flexible and prone to severe, permanent structural deformities under the sheer weight of the child's body. While rickets can affect infants and adolescents, it is most commonly seen in toddlers experiencing rapid skeletal growth. Left untreated, it leads to stunted growth, bone pain, and an increased susceptibility to fractures, making early recognition a fundamental priority for midwives and primary healthcare workers in Nigeria.
Normal bone formation relies heavily on an adequate supply of calcium and phosphorus, both of which require vitamin D for proper absorption in the gastrointestinal tract. Vitamin D acts as a prohormone that regulates mineral homeostasis. When vitamin D levels are deficient, dietary calcium cannot cross the intestinal wall efficiently, causing serum calcium levels to drop. To maintain vital neuromuscular functions, the parathyroid glands release parathyroid hormone (PTH). This hormone triggers calcium resorption from the bones, stripping the skeleton to keep blood levels stable. Consequently, new cartilage at the growth plates fails to calcify and mineralize properly, leading to the disorganized, widened, and weak bone structures characteristic of rickets.
Although Nigeria enjoys abundant sunlight, rickets remains a significant public health concern due to a combination of dietary, cultural, and environmental factors. Exclusive breastfeeding beyond six months without adequate vitamin D supplementation is a major contributor, as human breast milk is generally low in vitamin D. Additionally, cultural practices such as prolonged purdah, heavy infant clothing, and keeping babies indoors shielded from direct sunlight drastically limit cutaneous synthesis of vitamin D. Diets high in unrefined cereals containing high levels of phytates further bind calcium in the gut, preventing its absorption. Children from low-income households who consume limited dairy, eggs, and fortified foods face the highest risk of developing nutritional rickets.
The clinical signs of rickets usually become apparent when a child begins to sit, crawl, or walk. Midwives must be vigilant in recognizing both early non-specific signs and classic skeletal deformities during routine infant welfare clinics.
Diagnosing rickets requires a combination of clinical assessment, blood biochemistry, and diagnostic imaging. Laboratory investigations typically reveal low or normal serum calcium, low serum phosphate, and markedly elevated alkaline phosphatase (ALP) levels, which spike because bone-forming cells work overtime trying to mineralize the skeleton. Serum 25-hydroxyvitamin D levels will be significantly reduced in nutritional deficiencies. Plain radiographs of the wrist or knee provide definitive visual confirmation. X-ray findings show classic changes at the metaphyses, including widening, cupping, and fraying of the distal ends of long bones, alongside generalized bone rarefaction and loss of sharp cortical definition.
Medical treatment focuses on replenishing deficient stores of vitamin D, calcium, and phosphate to allow normal bone mineralization. High-dose oral vitamin D therapy is administered either as a single large stoss dose or through daily therapeutic regimens over several weeks, depending on the protocol and severity. Calcium supplements are routinely co-administered to prevent hungry bone syndrome, a sudden drop in blood calcium that occurs when starved bones rapidly absorb minerals once they become available. Clinicians monitor biochemical markers closely to ensure serum calcium and ALP levels return to normal ranges. Once healing is underway, maintenance doses of vitamin D and a balanced diet rich in dairy, fish, and fortified foods prevent recurrence.
Midwives and community health nurses play a pivotal role in preventing rickets through antenatal and postnatal health education. Mothers must be educated on safe sun exposure, ensuring infants receive adequate sunlight on their skin for natural vitamin D synthesis without risking sunburn. Midwives should promote exclusive breastfeeding for the first six months while advising appropriate vitamin D supplementation where sunlight exposure is restricted by cultural practices or clothing. Dietary counseling during weaning should emphasize incorporating locally available calcium-rich foods such as small fish eaten whole, dark green leafy vegetables, and fortified cereals. Proper positioning and gentle handling of infants with established skeletal weaknesses prevent accidental fractures while mobility is restricted.