Which bones are affected by osteoporosis

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Although the hipbones and the vertebrae (bones of the spine) provide the best measurements of bone loss, osteoporosis occurs in all bones. The osteoblasts and osteoclasts are most active in the bones of the body's central region, that is, bones of the hip and vertebrae, and the long bones of the arms and legs. The skull bone is very rarely affected by osteoporosis.

Fractures of the hip and vertebrae are also the most common fractures. Because all bones can be affected by osteoporosis, clinicians usually recommend that individuals with weakened bones, like those caused by osteoporosis and osteopenia, avoid playing certain sports or engaging in certain activities that will increase the likelihood of falls, which, of course, increases the risk of fractures of any bones, but particularly the hip (see Question 45).

Every bone has a soft inner portion known as the bone marrow as well as an outer portion made up of trabecular bone (connective spongy bone tissue) and cortical bone (the hard outer shell). Trabecular bone makes up the softer inner shell of all bones and is present in higher amounts in the hip, vertebrae, wrists, and ends of the long bones. The central and long bones have more trabecular bone than the other smaller bones in the body. Trabecular bone, which comprises about 20% of the body's bone, provides strength and integrity, produces blood products, and provides the surface used for mineral exchange, such as phosphorus and calcium. Bone marrow is found in the spaces between trabecular bone. Cortical bone makes up the hard outer shell of bone and is critical for bone strength. Figure 5 shows trabecular and cortical bone.

Menopause hormone therapy (MHT)

Type of treatment used for the relief of menopause symptoms; also helps to prevent bone loss.

Vertebrae

Individual bones of the spine. Fractures of these bones are the most common fractures in people with osteoporosis.

Long bones

The larger bones of the legs (femur, tibia, fibula) and arms (humerus, ulna, radius).

Trabecular bone

Connective spongy tissue of bone, particularly of the central and long bones. Provides strength and integrity, houses bone marrow, produces blood products, and provides the surface used for the exchange of calcium and phosphorus.

Cortical bone

The hard outer shell of bone; critical for bone strength.

Cortical bone

Cortical bone

Bisphos Fracture
Figure 5 Cortical and trabecular bone. Courtesy of Eli Lilly and Company.

In primary osteoporosis, women lose 5% to 10% of cortical bone and 20% to 30% of trabecular bone during the rapid bone loss occurring in the four to eight years following menopause. In contrast, men and women (after the faster postmenopausal bone loss) experience a slower rate of bone loss as a result of aging. Occurring slowly over many years, this type of bone loss accounts for about a 20% to 25% loss of both cortical and trabecular bone. Thus, women are at risk for much greater bone loss than men.

PART TWO

Risk Factors and Testing

Who gets osteoporosis?

Could I be taking any medications that affect bone health?

Can my clinician tell if I have osteoporosis during my annual check-up?

How is osteoporosis diagnosed?

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