This article is more than 5 years old. Information may no longer be current.

Modified straight stem’s curvature allows implantation in narrow femoral cavities

Add topic to email alerts

Receive an email when new articles are posted on

Please provide your email address to receive an email when new articles are posted on .

Subscribe

Added to email alerts

You've successfully added to your alerts. You will receive an email when new content is published.

Click Here to Manage Email Alerts

You've successfully added to your alerts. You will receive an email when new content is published.

Click Here to Manage Email Alerts

Back to Healio

We were unable to process your request. Please try again later. If you continue to have this issue please contact customerservice@slackinc.com.

Back to Healio

Researchers reported successful outcomes using a modified straight cementless hip stem with proximal-medial curvature for proximal fixation in total hip arthroplasty, according to a study presented at the SICOT XXV Triennial World Congress 2011.

“Most studies … say narrow femoral bone conditions can be challenging,” Steffen Kohler, said. “The small shape of stem designs may change outcomes dramatically.”

Kohler conducted a prospective study of 123 hips, of which 100 hips in 92 patients were available for follow-up, between February 1991 and November 1996. One patient died of pulmonary embolism on the second postoperative day. Mean follow-up was 148 months. One-third of the patients had a diagnosis of dysplasia, one-third of patients had primary osteoarthritis and one-sixth of patients suffered aseptic femoral head necrosis or other diagnosis, according to Kohler.

The Kaplan-Meier survival rate of the stem was 99%, with one loose stem. The baseline was low, with 28 points for the Harris Hip Score (HHS) which reached 93 points at the time of last follow-up. Kohler said HHS may have been lower preoperatively than postoperatively because it may depend on the modification performed on the hip stem and the wait time for patients with severe arthritis to undergo the operation due to the procedure’s popularity.

Kohler discovered radiolucency on the proximal end of the stem. However, the proximal sealing effect of the microporous titanium coating seemed to prevent trochanteric osteolysis with exceptions, he said.

“I think the change of the stem, the modification, could demonstrate convincing results,” Kohler said.

Reference:

• Kohler S. Results of cementless THA in indications for narrow femoral cavities. Presented at the SICOT XXV Triennial World Congress 2011. Sept. 6-9. Prague.
• Disclosure: Kohler is a paid consultant for Aesculap AG.

Follow OrthoSuperSite.com on Twitter