Elevated BMI may not be a risk factor for dislocation, revision for instability after THA

ByCasey Tingle

Fact checked byGina Brockenbrough, MA

Key takeaways:

Compared with normal BMI, elevated BMI may not increase the rate of dislocation after total hip arthroplasty.
The normal and elevated BMI groups had a similar incidence of revision for instability.

GRAPEVINE, Texas — Elevated BMI in patients undergoing primary total hip arthroplasty may not be an independent risk factor for dislocation or revision for instability, according to results presented here.

“This study helped us see that there is no difference in dislocation rates or revision for instability when you compare control patients to elevated BMI patients,” E. Bailey Terhune, MD, said in her presentation at the American Association of Hip and Knee Surgeons Annual Meeting.

Terhune and colleagues retrospectively stratified data on patients who underwent primary THA for osteoarthritis into groups based on BMI and matched patients with an elevated BMI based on age, sex and Elixhauser Comorbidity Index to a control cohort of patients with a BMI of 20 kg/m² to 24.9 kg/m².

“Most importantly, our analysis controlled for a history of spinal fusion, alcohol abuse and neurodegenerative disorders ... that will lead to an increased risk of dislocation after primary hip,” Terhune said. “[We were] trying to isolate the effect of BMI in this cohort.”

Terhune said patients with an elevated BMI had no differences in the rate of dislocation at any time point compared with the control cohort. She added patients in the elevated BMI cohort did not have a higher rate of dislocation compared with patients in the lower BMI cohorts.

“There is something about these patients that is leading to an increased rate of dislocation, but it is not solely their elevated BMI,” Terhune said. “Here we looked at revision for instability at 1 year postoperatively and, again, the control cohort had the exact same incidence of revision for instability at 1 year compared to any cohort of elevated BMI patients.”

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Source:

Terhune EB, et al. Paper 13. Presented at: American Association of Hip and Knee Surgeons Annual Meeting; Nov. 2-5, 2023; Grapevine, Texas.

Disclosures: Terhune reports no relevant financial disclosures.

American Association of Hip and Knee Surgeons Annual Meeting

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Elevated BMI may not be a risk factor for dislocation, revision for instability after THA

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