High flexion knee replacement shows more flexion than standard prosthesis

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MANCHESTER – A rotating platform high flexion prosthesis showed increased flexion than the standard knee prosthesis in a comparison study presented at the British Orthopaedic Association Congress 2012, here.

“We did show a significant difference in all our measurements in flexion between the standard and high flexion knee replacement, but no significant differences in any of the other measures,” Birgit C. Hanusch, said in the presentation.

Hanusch said high flexion knee replacements increase range of flexion up to 155° and she and her colleagues wanted to test the ability of the PFC RP-F (Depuy Orthopedics Inc., Warsaw, Ind.) in the “real world.”

Birgit C. Hanusch

The researchers randomized 84 patients into a high flexion or a standard knee replacement group, excluding patients with a body mass index higher than 35. They assessed patients for range of motion, Oxford Knee Score (OKS) and Knee Society Score (KSS) at 3 months and 12 months after surgery, wih follow up at 1 year.

The high flexion group had 8° more flexion in range of motion than the standard knee replacement group, but no significant differences were found in OKS or KSS measurements. Hanusch said the differences in range of motion were not reflected in the functional outcomes. Although there was not a large number of complications in either group, a few patients in the flexion group needed secondary patellar resurfacing, Hanusch said. She was not certain if the complications were a problem with the design, but said the problems are being addressed and future designs may change as a result.

Reference:

Hanusch BC, Gregg PJ, Hui AC. Functional outcome of PFC Sigma and PFC Sigma RP-F total knee arthroplasty: a randomized controlled trial. Paper #69. Presented at the British Orthopaedic Association Congress 2012. Sept. 11-14. Manchester.

Disclosure: Orthopedics Today was unable to confirm relevant financial disclosures at press time.