Preventing hip fractures

A computerised study of hip bones suggests that certain exercises could limit the steep increase in hip fracture risk that occurs as people grow old, British researchers report.

The exercises would be aimed at strengthening the upper portion of the femur, the leg bone that fits into the hip, said doctors at the University of Cambridge.

Dr Paul M. Mayhew and his colleagues collected the femurs of 81 adults who died suddenly; the researchers then performed computerised tomography to create three-dimensional images of the middle of the neck of the bones.

Thinning of cortex linked to type of exercise
The investigators found that the cortex, the outer layer of the femur, became progressively thinner with age. The thickness of the cortex in women decreased 6.4 percent every decade, and the reduction was only slightly less for men.

That thinning reduces the amount of energy the femur can absorb before buckling to cause a hip fracture, the researchers said. And the reason the thinning occurs is that older people tend to limit their exercise to walking, which does not strengthen the cortex of the femur, they suggested.

The same thinning does not occur in tree-dwelling apes - close relatives of humans - because climbing trees is an exercise that strengthens the femur, the researchers said.

"Several popular forms of exercise also involve extension of the flexed femur under load (cycling, sculling, gymnastics, weights)," they wrote. "Some should be investigated for their potential to protect, as part of our society's drive to increase physical activity for health."

The findings appear in the July 9 issue of the journal The Lancet.

Solution may not be that simple
But Charles H. Turner, a professor of biomedical engineering at Indiana University School of Medicine, said the solution may not be that simple.

"This new paper does great service to the field," said Turner, who wrote an accompanying editorial in the journal. "But we should be doing more work to learn how best to strengthen that part of the hip."

The problem, he said, is that "I don't think anybody who prescribes exercises knows how to make one that strengthens that part of the hip preferentially."

Researchers are "now giving thought about the best approach to make stronger hips," Turner said. "That might come in the future, as we focus our efforts on it."

Exercises would only be a partial solution
But even identifying such exercises would only be a partial solution to the problem of hip fractures in the elderly, said Dr Kenneth A. Egol, chief of the fracture service at New York University-Hospital for Joint Diseases.

"This looks at only one kind of hip fracture," Egol said. "Breakage of the femoral neck accounts for only half of all hip fractures."

Other risk factors - notably osteoporosis, the progressive thinning of all bones that occurs with aging - also are important, he said.

Still, Egol recommends exercises, specifically those "that counteract tension forces across the femoral neck, the side-lift kind of exercise that is best at improving muscle strength and secondarily improving the strength of the bone." – (HealthDayNews)

Read more:
Visit Health24's Osteoporosis Centre

We live in a world where facts and fiction get blurred
In times of uncertainty you need journalism you can trust. For 14 free days, you can have access to a world of in-depth analyses, investigative journalism, top opinions and a range of features. Journalism strengthens democracy. Invest in the future today. Thereafter you will be billed R75 per month. You can cancel anytime and if you cancel within 14 days you won't be billed. 
Subscribe to News24
Voting Booth
The ANC's leadership race is heating up. Who do you think will be elected party president at Nasrec in December?
Please select an option Oops! Something went wrong, please try again later.
Nkosazana Dlamini-Zuma has got it in the bag
6% - 208 votes
I foresee a second term for Cyril Ramaphosa
81% - 2705 votes
Don’t discount a Zweli Mkhize win
12% - 413 votes
Rand - Dollar
Rand - Pound
Rand - Euro
Rand - Aus dollar
Rand - Yen
Brent Crude
Top 40
All Share
Resource 10
Industrial 25
Financial 15
All JSE data delayed by at least 15 minutes Iress logo
Editorial feedback and complaints

Contact the public editor with feedback for our journalists, complaints, queries or suggestions about articles on News24.