No Major Differences in Improvement Seen with Progressive Resistance Training Versus Neuromuscular Exercise for Hip Osteoarthritis

Dead Heat Between PRT and NEMEX

The primary endpoint was the 30s-CST, which counted the number of times participants could stand from a seated position in 30 seconds. Participants in the PRT and NEMEX groups were able to do this maneuver a respective 11.3 and 11.6 times at baseline and 12.8 and 13.1 times after completion of the exercise programs. 

Other functional performance tests included a 40-m fast-paced walk, a nine-step timed stair climb, leg extensor power in the affected and unaffected limb, and a unilateral single repetition leg press. None of these showed a statistically significant benefit of PRT over NEMEX, or vice versa.

HOOS pain scores at baseline and 12 weeks for PRT were a respective 57.5 and 66.1, representing an overall 8.6-point increase, and for NEMEX they were 58.9 and 68.2, giving a 9.3-point increase, meaning there was only a -0.7 mean change when comparing the two groups.

Corresponding baseline and 12-week HOOS QOL scores for PRT were 43.7 and 51.7; for NEMEX, they were 47.1 and 52.8 thus giving 8.0- and 5.7-point increases and a 2.3 difference in change between the groups. Again, this wasn’t quite enough to show a clinically meaningful effect.
 

Future Steps

“The effect of exercise seems to be at its highest at 3-4 months when you implement exercise, so we compared the effects of the exercises at the time when they are probably going to be at their highest,” Mr. Kjeldsen explained. He said the research team also plans to look at what happens after 1 year of follow-up.

“The key take home message is that patients can be encouraged to pick the type of exercise that they find the most enjoyable, or the type that is available to them,” Mr. Kjeldsen suggested. 

Stephanie Chang, MD, MPH, who is the Deputy Editor of Annals of Internal Medicine and practices in Rockville, Maryland, commented on the paper to this news organization. “In this small study, we learned that exercises to strengthen lower extremity muscles did not improve pain or function any more than exercises for core stability and balance,” she said.

Dr. Chang pointed out that there was variance in the levels of activity that people already undertook at baseline: 40% of the PRT group and 41% of the NEMEX group already did 150 minutes or more of moderate intensity physical activity. 

“It’s possible that benefit or differences between interventions would be greater in people with different levels of baseline activity or even in those with different osteoarthritis severity,” she said. 

“In the meantime,” Dr. Chang added, “with the findings from this study, I would feel comfortable advising my patients with hip osteoarthritis to engage in whichever type of exercise they prefer — whether that exercise focuses on core strengthening and balance or on specific lower extremity muscle strengthening.”

The trial was funded by the Independent Research Fund Denmark, the Physiotherapy Practice Foundation, the Health Foundation, Aarhus University, Region Zealand, the Association of Danish Physiotherapists, Andelsfonden, and Hede Nielsens Family Foundation. Mr. Kjeldsen and Dr. Chang report no relevant financial relationships.

A version of this article appeared on Medscape.com.