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

Mid-term results show good motion in patients with floating platform prosthesis

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

A mobile bearing knee prosthesis designed with high areal contact showed excellent function and range of motion at mid-term follow-up with nearly 75% of patients obtaining knee flexion of 120° or more, according to a recently presented study.

“The floating platform version of the e.motion knee system (B.Braun; Melsungen, Germany) is predominantly recommended for use in the more active younger patient who is muscularly able to control the kinematics of such an implant,” Rolf K. Miehlke, MD, said in a presentation at the SICOT XXV Triennial World Congress 2011 in Prague.

Two-radius design principle

Miehlke, of the Rhine-Main Centre for Joint Diseases, in Wiesbaden, Germany, and colleagues used the Knee Society Score (KSS) to study results in 130 patients with an average age 65 years who received the implant. The knee prosthesis is based on a two-radius design principle with an anterior radius for a long and deep patellar groove and a single radius for both condyles, according to the abstract.

Among patients included in the study, 70% had osteoarthritis and 30% had inflammatory joint diseases.

At a mean follow-up of 66 months, the KSS increased 85.7 points to 184.3 points total — 93.8 points clinical and 90.5 points functional. By comparison, preoperative KSS scores were about 98 points total — 48.6 points clinical and 49.9 points functional.

Alignment, motion

The average range of motion at follow-up was 121.3° (range 80° to 140°); 74.4% of patients had postoperative flexion greater than 120°.

Investigators deemed the mechanical axis excellent in 90% of cases and unacceptable in about 3% of cases. When surgeons used manual instrumentation, they found 71.2% of patients had excellent alignment, investigators reported.

Recent wear tests for the implant, as noted in the study, indicated a low rates of polyethylene wear despite signs of surface and multidirectional undersurface polyethelene wear.

Reference:

• Miehlke RK, Thiel B. Design rationale and mid-term results of the e.motion knee system. Paper #27503. Presented at the SICOT XXV Triennial World Congress 2011. Sept. 6-9. Prague.

Follow OrthoSuperSite.com on Twitter