Blog | Tuesday, June 7, 2011

Osteoporosis: What about men?


Treating reduced bone density in women is a big business, from its detection with bone density screening (DXA), to its treatment with medications, such as the blockbuster bisphosphonates, to the medical care that the condition generates through referrals to specialists. It seems curious to me that men have been neglected as the objects of this frenzy.

It's estimated that the lifetime risk of an osteoporotic fracture in women is 1 in 2, and in men that it's 1 in 5. With our aging population, hip, femoral and vertebral fractures are a significant source of morbidity and mortality in the elderly. I've written about treating bone loss in women: "Osteopenia: to treat or not to treat." A study published last year in the Annals of Internal Medicine demonstrated that although hip fractures are more common in women, they lead to higher mortality in men. In general, the onset of osteoporosis is 10 years delayed in men compared with women.

Recently a middle-aged man consulted with me about osteoporosis. Several years prior a gastroenterologist had been worried about my patient's chronic use of omeprazole, a proton pump inhibitor. Proton pump inhibitors reduce acid secretion in the stomach. Their use has been linked to reduced absorption of calcium and possibly to an increased risk of osteoporotic fractures, though this is still controversial. A bone density test was ordered and my patient's bone density was found to be low, in fact, in the "osteoporosis" range (T score <-2.5). My patient was sent to an endocrinologist and was determined to have no secondary risk factors for osteoporosis. However, my patient was prescribed alendronate. With no clear end in sight for treatment with this medication, he asked me whether I felt it was necessary to continue.

The fact is little is known about treating men's bones--that is, the ones in their skeletons.

A few trials have looked at DXA screening in men and found that T scores, the measurement used to define bone loss (a "T score" is the standard deviations from the mean for peak bone density), are as predictive of fracture risk in men as they are in women. However, the data is very limited. Bisphosphonate use has not been widely studied in male patients, particularly not in younger men with idiopathic osteoporosis. A couple of trials have looked at alendronate use in men with secondary risk factors and found it to have efficacy in preventing fractures. Best practice guidelines for treating osteoporosis in men were published in April 2011 by Gielen in Best Practice & Research Clinical Endocrinology & Metabolism, which states:
"With the ageing of the population, male osteoporosis is an increasingly important health problem: from age 50 onward, one in three osteoporotic fractures occurs in men and fracture-related morbidity and mortality is higher than in women. In men with low BMD, 50% have an underlying cause, most often glucocorticoid excess, hypogonadism or alcohol abuse. DXA is recommended in all men from 70 years of age on and in men age 50-70 with a prior fragility fracture or clinical risk factors. Treatment decisions should be based on assessments of absolute fracture risk and not on BMD alone. Supplementation of calcium and vitamin D is essential in ageing men to prevent age-related secondary hyperparathyroidism. Bisphosphonates and PTH seem to be as effective in men as in women and should be given to men with DXA-documented osteoporosis, a prior fragility fracture or high absolute fracture risk as assessed by FRAX. Testosterone replacement can only be recommended in older men with osteoporosis who have symptoms of hypogonadism as well as total testosterone values below 250 ng/dL(9 nmol/l)."

Experts acknowledge that while bone mineral density testing may be useful, it is just one piece of the equation when it comes to assessing a person's fracture risk. Clinical risk calculators take into account clinical risk factors and project a person's 10-year risk of suffering an osteoporotic fracture. The most widely known risk calculator is called FRAX, a tool developed by the World Health Organization. Clinical factors that contribute to fracture risk include age, body mass index, tobacco use, glucocorticoid use, alcohol use (>3 drinks per day), parental history of hip fracture, "secondary" causes of osteoporosis (low testosterone, hyperparathyroidism, hyperthyroidism and certain drugs), and the presence of rheumatoid arthritis.

In their recently released Guidelines on the Treatment of Osteoporosis the USPSTF concludes that there is insufficient evidence to support screening men for osteoporosis.

The case of my patient is a good example of how the well-intentioned use of testing may lead to information that we just don't have good answers for yet. In the absence of firm data, the question becomes, does one opt to treat with medication, for how long, and with what sort of monitoring? And if not, then what should one suggest? Frankly, I find the relative lack of data about male osteoporosis surprising.

Juliet K. Mavromatis, FACP, is a primary care physician in Atlanta, Ga. Previous to her primary care practice, she served on the general internal medicine faculty of Emory University, where she practiced clinical medicine and taught internal medicine residents for 12 years, and led initiatives to improve the quality of care for patients with diabetes. This work fostered an interest in innovative models of primary care delivery. Her blog, DrDialogue, acts as a conversation about health topics for patients and health professionals. This post originally appeared there.