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INTRODUCTION

Like bones which, broke in sunder, and well set, knit the more strongly . . but old bones are brittle.

JOHN WEBSTER (1580–1625)

Osteoporosis, which literally means porous bone, is reduced bone mass per unit volume (see FIG. 81.1), thus predisposing the person with it to an increased risk of fracture. It also refers to the increased bone fragility that accompanies ageing and many illnesses. Following menopause, women begin to lose calcium from their bone at a much faster rate than men, presumably in response to low levels of oestrogen. By the age of 65 the rate of fractures in women has increased to 3–5 times that of men.1 However, a third of all hip fractures in the community occur in men.

FIGURE 81.1

Osteoporosis is reduced bone mass per unit volume

In recent decades osteoporosis was largely prevented by correction of oestrogen deficiency through the use of hormone replacement therapy but the balance has changed since the controversial association of HRT with breast cancer was reported.

Key facts and checkpoints

  • Osteoporosis is silent, common, measurable, treatable and potentially lethal.2

  • Osteoporosis is commonest in postmenopausal women.

  • An estimated 2 in 5 women and 1 in 4 men will develop fragility fractures in their lifetime and 30% of all women reaching 90 years of age will suffer a hip fracture.1,3

  • Osteoporosis leads to reduced bone strength and susceptibility to fracture, even with minor trauma.

  • Osteoporosis usually causes pain when complicated by fracture.

  • First presentation is usually a fracture (Colles, femoral neck and vertebra) or height shrinkage.

  • Vertebral collapse is the hallmark of osteoporosis.

  • For osteoporosis in a vertebra including a pathological fracture, multiple myeloma needs exclusion.

  • The first step in prevention is regular exercise, an adequate dietary intake of calcium (1500 mg per day) and maintenance of adequate serum vitamin D levels.

CLASSIFICATION

Primary

4Type 1: Postmenopausal (typically vertebral or distal forearm fractures between the ages of 51 and 75). Due to increased osteoclast activity. It is six times more common in women than men.

Type 2: Involutional or senile osteoporosis (typically fracture of proximal femur and other bones). It affects those over 60 years and is twice as common in women as in men.

Idiopathic osteoporosis: Occurs in children and young adults of both sexes with normal gonadal function.

Secondary

Secondary to endocrine disorders, malabsorption and malignancies. Various causes and risk factors are presented in TABLE 81.1.

Table 81.1Osteoporosis: risk factors and/or causes3

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