Osteoporosis During Pregnancy - Causes, Symptoms, and Treatment

Introduction

Osteoporosis is the prevalent bone condition among adults, typically affecting individuals aged 50 and above. Instances of osteoporosis during pregnancy are uncommon. When osteoporosis occurs during pregnancy, it is termed pregnancy-associated osteoporosis (PAO). Common symptoms include back pain and fractures. Though exceptionally rare, it can result in significant pain and enduring injury.

What Is the Impact of Pregnancy on Bone Health?

It is typical for individuals to undergo a reduction in bone density during pregnancy. The developing fetus requires calcium for the formation of its skeleton. If a pregnant individual does not obtain sufficient calcium from their diet, the body will extract calcium from the bones to support the baby's growth. Breastfeeding individuals also experience calcium loss from their bones. Approximately three to five percent of bone mass is estimated to be lost during breastfeeding, with recovery occurring after weaning.

While most pregnant individuals do not encounter bone issues and regain their bone density post-breastfeeding, it is essential to safeguard bone health during these phases. The following measures are recommended:

• Consume 1,000 milligrams of calcium daily from food or supplements.

• Engage in daily exercise, particularly weight-bearing and resistance activities.

• Seek resources from healthcare providers to support smoking cessation.

How Does Pregnancy Impact Individuals With Osteoporosis?

Osteoporosis typically affects those aged 50 and older, with only about two percent of affected individuals being under 50 and merely 1.2 percent falling between 20 and 40 years of age. The prevalence of pregnancy-associated osteoporosis (PAO) is so low that researchers are uncertain about the precise numbers. While uncommon, there is a rare possibility of developing osteoporosis after childbirth and during nursing, known as pregnancy and lactation-associated osteoporosis (PLO).

PAO primarily affects bones, particularly the vertebrae and occasionally the hip, causing them to become thinner and weaker. In osteoporosis, the internal structure of bones diminishes in thickness and strength. Due to the rarity of PAO, it is not routinely screened for, and initial indications often manifest as back pain or fractures.

What Are the Symptoms of Pregnancy-Associated Osteoporosis (POA)?

Symptoms of osteoporosis during pregnancy are uncommon and often catch people by surprise. The initial signs may be subtle, and sometimes, there might not be any symptoms until a bone breaks. These may include:

• Intense back pain.

• Compression fractures in the vertebrae.

• Unexpected bone fractures.

What Is the Reason for Osteoporosis During Pregnancy?

The cause of pregnancy-associated osteoporosis is not yet fully understood. It seems to occur unexpectedly in some women during pregnancy, and age is not a determining factor. Women who experience bone fractures during pregnancy typically have normal levels of calcium and hormones, and they do not have any pre-existing bone conditions like osteogenesis imperfecta.

Experts propose several potential reasons for pregnancy-associated osteoporosis:

• Pregnancy might trigger an unusual reaction in bones that were previously healthy.

• Normal bone loss during pregnancy could exacerbate bone weakening in women with already fragile bones. However, having low bone density before pregnancy does not necessarily result in faster bone loss or fractures during or after pregnancy.

These are hypotheses, and further research is needed to understand better why some women develop pregnancy-associated osteoporosis.

What Is the Diagnosis of Osteoporosis During Pregnancy?

Pregnant women are typically assessed for pregnancy-associated osteoporosis when they report intense back pain. Utilizing X-rays or other imaging techniques can uncover fractures in the bones that form the spine, known as vertebral compression fractures. These fractures commonly emerge during the third trimester or following childbirth. Diagnostic imaging methods for identifying pregnancy-associated osteoporosis include:

• Magnetic resonance imaging (MRI).

• Computed tomography (CT) scan.

• 3D CT scan.

• Dual-energy X-ray absorptiometry (DEXA) scan.

• Bone biopsy.

What Are the Risk Factors of Osteoporosis During Pregnancy?

Certain women may start their pregnancy with lower bone density due to pre-existing conditions. Risk factors include a family history of osteoporosis, personal history of disordered eating or the Female Athlete Triad, digestive diseases like Crohn’s or inflammatory bowel disease affecting calcium absorption, or bone disorders like osteogenesis imperfecta (brittle bone disease). Although these women may recover some lost bone during pregnancy, reaching "normal" levels is less likely because they began with a deficit. For those with such concerns, consulting with an endocrinologist and a nutritionist before pregnancy can help formulate a plan to safeguard bone health.

It is crucial to acknowledge that in sporadic cases, pregnancy-and-lactation-associated osteoporosis (PLO) can make a woman more susceptible to bone fractures, especially in the hip or spine, with or without external impact such as a fall. Severe back pain or pain at the fracture site is a common symptom of PLO. If this occurs, seeking urgent or emergency care is essential.

What Is the Approach to Treating Osteoporosis During Pregnancy?

Adhering to the doctor’s guidance is crucial if someone is dealing with osteoporosis during pregnancy. The primary treatment objectives are to alleviate pain, prevent additional fractures, and initiate the restoration of bone density. Various treatment options will not harm the baby, including lifestyle adjustments, such as:

• Incorporating supplements like calcium and vitamin D.

• Increasing intake of calcium-rich foods like dark, leafy greens and dairy.

• Enhancing physical activity levels.

• Avoiding falls and refraining from lifting heavy objects.

Medications that aid in boosting bone density, such as:

• Calcitonin.

• Teriparatide.

• Surgical interventions to address vertebral fractures, such as kyphoplasty and vertebroplasty, may also be considered.

It is important to note that while bisphosphonates are commonly prescribed for osteoporosis, they are not recommended during pregnancy due to their potential impact on the baby's skeletal development, urinary tract, and facial features. Bisphosphonates may persist in the bones for up to ten years, potentially influencing future pregnancies.

What Is the Effect of Pregnancy-Associated Osteoporosis on the Baby?

Fortunately, individuals experiencing pregnancy-associated osteoporosis can still have healthy pregnancies and babies. While this uncommon condition does not influence the development or well-being of the fetus, the chosen treatment options may play a role. Certain medications used to address pregnancy-associated osteoporosis, like bisphosphonates, may have implications for the fetus and future pregnancies. It is crucial to inform the healthcare provider if one plans to have more children when discussing a treatment plan. Pregnancy-associated osteoporosis is more frequently observed in a person's initial pregnancy but can also occur in subsequent ones.

People with pregnancy-associated osteoporosis can safely breastfeed as long as they are not taking any medications that could be transferred to the baby through breast milk.

Conclusion

Pregnancy-associated osteoporosis (PAO) is a rare condition primarily affecting individuals aged 50 and above, with only a small percentage occurring during pregnancy. The impact of pregnancy on bone health involves a natural reduction in bone density, which, if not managed properly, can lead to complications. Symptoms of PAO, such as back pain and fractures, may be subtle, making early detection challenging. While the exact cause remains unclear, potential risk factors include pre-existing conditions and abnormal reactions in previously healthy bones. Fortunately, PAO does not typically affect the well-being of the fetus, and individuals can still have healthy pregnancies with proper management.