Who develops osteoporosis?

Throughout life, the skeleton is continually renewing itself through a process known as remodelling or bone turnover. In healthy bone, the rate of bone breakdown is linked to the rate of bone formation so that bone strength is maintained. As we get older, the rate at which bone is broken down increases and exceeds the rate at which bone is formed. This results in loss of bone and may lead to osteoporosis and an increased risk of fracture.
Several factors increase the risk of developing osteoporosis and/or fractures. These are age and ethnicity, medical risk factors and lifestyle factors. But being female and postmenopausal is a big risk factor for osteoporosis which is several times more common in women than in men (for more information see resources).

Age and ethnicity

Postmenopausal white and Asian women are most at risk of developing osteoporosis. Oestrogen protects bones and after the menopause levels decrease significantly.

Other medical risk factors

Medical factors that significantly increase the risk of people developing osteoporosis are’ premature menopause (before the age of 45), steroid therapy, previous fragility fractures, low body weight and amenorrhoea (absence of menstrual period before the menopause). Thyroid disease, rheumatoid arthritis, low levels of testosterone in men and conditions that affect the absorption of food such as Crohn’s or coeliac disease are also risks factors for osteoporosis.

Other medical conditions include: endocrine disease, kidney disease, liver disease and obstructive lung disease. Myeloma is a cancer that is frequently associated with a rapid destruction of bone, leading to osteoporosis.

Several frequently used medications have also been associated with increased fracture risk’ anti epileptic drugs, breast cancer treatments such as aromatase inhibitors, SSRI’s – selective serotonin receptor uptake inhibitors (a group of antidepressant medicine), thiazide diuretics (a common treatment for high blood pressure) and possibly proton pump inhibitors (commonly used to treat acid reflux and ulcers of the stomach and duodenum).

Lifestyle

Lifestyle factors include diet (calcium and vitamin D deficiency), drinking alcohol (more than 3 units per day); smoking and immobility (physical inactivity).

At the time of their diagnosis most people didn’t know what could have caused their osteoporosis. Many understood that it could be hereditary but most were unaware of the many other factors that might trigger bone loss leading to osteoporosis. Here they talk about what they think and what their doctors told them about the risk factors associated with their osteoporosis.

Many of the men and women we talked to were sure that they had inherited osteoporosis from their mothers and maternal grandmothers, who had been diagnosed with the condition. But not all were certain. Several elderly people said that they were not sure whether their mothers had osteoporosis because it was at a time when people knew little about osteoporosis or they simply weren’t diagnosed with it. Some said that in the past people commonly attributed the loss of height and the development of a ‘Dowagers hump’ – a rounding of the spine – to ‘old age’ rather than to osteoporosis.

She remembers her mother breaking bones and in later life becoming quite bent and losing height…

Age at interview 73

Gender Female

Age at diagnosis 69

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In many cases there were one or more risk factors other than heredity. For example Jane’s osteoporosis was diagnosed through pregnancy and her mother also has the condition.. But she thinks that her coeliac disease, undiagnosed for many years, was the main factor in her osteoporosis. She said that it was an unfortunate coincidence the fact that she was pregnant at the time. Coeliac disease can lead to malabsorption of nutrients, including calcium, and it had affected a few of the women we talked to.

Michelle listed three risk factors; heredity, coeliac disease and an anti-oestrogen treatment for…

Age at interview 63

Gender Female

Age at diagnosis 45

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Several women thought an early menopause after hysterectomy had triggered their osteoporosis. Hysterectomy alone is not a big risk factor if ovaries are conserved. The average age of menopause is brought forward but much more relevant is whether ovaries are removed. It is important for women after hysterectomy to have ovarian function measured especially if they have menopausal symptoms. Lack of oestrogen has an effect on bone density and if oestrogen deficiency is found it should be replaced by hormone replacement therapy (HRT). A couple of women were put on HRT after surgery but one did not receive the hormone treatment until years later. Other women, who had an early menopauses not due to a hysterectomy, were not concerned at all about having an early menopause. At the time they were more than glad to see an end to their periods. It was only after diagnosis that they learnt that it is a big risk factor for osteoporosis.

Emma had a hysterectomy around 1984 and was put on HRT in 1992 after complaining of severe…

Age at interview 61

Gender Female

Age at diagnosis 47

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Thyroxine replacement therapy is not bad for bone health unless an inappropriate dose is used, for example too high. This treatment can be monitored with thyroid function tests. A few of the women we talked to had been diagnosed before or soon after the diagnosis of osteoporosis with thyroid disease. Two were on medication but one decided to stop it after she developed breathing difficulties.

Carols doctor made her aware that thyroxine; the medication used to treat her thyroid problem is not good for her bones. But she feels much better on it.

Age at interview 71

Gender Female

Age at diagnosis 70

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Osteoporosis is commonly viewed as affecting women, primarily after the menopause, but it can also affect men. Deficiency of the sex hormone testosterone has been found in men with osteoporosis.

Keith’s consultant told him that his osteoporosis is most likely to be hereditary but indicated…

Age at interview 55

Gender Male

Age at diagnosis 54

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Two people we talked to had been on the antidepressant drugs phenelzine or tryptophan for many years. They learnt that these were a likely factor for their osteoporosis.

Dennis has been on the anti-depressive drug, Phenelzine for over twenty years and his consultant…

Age at interview 59

Gender Male

Age at diagnosis 55

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Several men and women had used oral steroid therapy (prednisolone) to treat various conditions such as rheumatic disease, inflammation of the bowel and some lung diseases. But several elderly people said that in the past they had been on ‘terrifically’ high doses of steroid for more than 3 months. Only one of them knew that steroids could cause bone loss and osteoporosis.

Neville had ulcerative colitis and took high dosages of predniselone over a three year period. He…

Age at interview 74

Gender Male

Age at diagnosis 69

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Joan was put on a high dosage of steroids to treat a suspected haemolytic anemia. After nine…

Age at interview 88

Gender Female

Age at diagnosis 74

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David has always known that steroids and rheumatoid arthritis were damaging his bones. Steroids…

Age at interview 25

Gender Male

Age at diagnosis 23

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Many people think that lifestyle factors are primarily responsible for their osteoporosis in particular, calcium and vitamin deficiency in their diets. Several recalled that as children or young adults they had little milk or other dairy products in their diet. Two women suffered from ME and allergies and therefore avoided dairy products for many years. A few mentioned lack of exercise or smoking as ‘triggers’ for their osteoporosis. But not everyone realised that lifestyle could also contribute to bone loss and/or osteoporosis. Christine has been semi-paralysed for over 20 years and had learnt only recently that immobility is a risk factor. Likewise, Valerie said that no one ever mentioned to her before she developed osteoporosis that smoking is a serious risk but she still does not intend to give up (see also Osteoporosis, smoking and alcohol).

In her forties Iris had partial hysterectomy (ovaries were not removed) but she is convinced that…

Age at interview 60

Gender Female

Age at diagnosis 59

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Two elderly women attributed their osteoporosis to ‘wear and tear’ of their bodies from heavy physical work caring for an ill spouse over the years, combined with the menopause.

Noreens diagnosis was a shock but she realised that she had worked her body quite hard when…

Age at interview 77

Gender Female

Age at diagnosis 75

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Some people could not explain their condition because they had none of the clinical or lifestyle factors and were relatively young. Many older people on the other hand attributed their osteoporosis more to aging than to anything else.

Robert feels frustrated that he cant see any strong reason as to why he developed osteoporosis.

Age at interview 49

Gender Male

Age at diagnosis 43

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A very rare condition named mastocytosis was the risk factor linked to Rose’s osteoporosis.

Rose’s consultant told her that mastocytosis was the main contributory factor in her osteoporosis.

Age at interview 76

Gender Female

Age at diagnosis 57

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Anorexia nervosa, over exercising, secondary amenorrhoea and other gynaecological problems are some of the other factors that are putting men and pre-menopausal women at risk of developing osteoporosis.

Medication for osteoporosis

The current medicines licensed for osteoporosis aim to prevent further bone loss and to reduce the risk of fractures. Osteoporosis is classified as a 'chronic...