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High flexion TKR device shows more flexion than standard TKR prosthesis
Investigators found that two patients in the study's high flexion group required a secondary patellar resurfacing.
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MANCHESTER — A rotating platform high flexion prosthesis showed increased knee flexion compared to a standard knee prosthesis design in a recently presented randomized controlled trial.
“We did show a significant difference in overall range of motion and flexion between the standard and high flexion knee replacement, but no significant differences in any of the other measures,” Birgit C. Hanusch, MSc, MRCS, of James Cook University Hospital, in Middlesborough, United Kingdom, said during a presentation at the British Orthopaedic Association Congress.
High flexion knee replacements are designed to achieve flexion up to 155°, and Hanusch and colleagues wanted to test the ability of the PFC RP-F (DePuy Orthopaedics Inc.; Warsaw, Ind., USA) in the “real world,” she said.
“This study was the first one I am aware of to show the difference in range of motion between the two implants, with the high flexion group achieving up to 9° more on average in overall range of movement,” Hanusch said.
The researchers randomized 84 patients into a high flexion total knee replacement (TKR) or a standard TKR group and excluded patients with a body mass index greater than 35. They assessed patients for range of motion, Oxford Knee Score (OKS), Knee Society Score (KSS) and general health with the SF-12v2 at 3 months and 12 months postoperatively.
On average, the high flexion TKR group had 8° more flexion and 9° more overall range of motion than the standard TKR group, but there were no significant differences seen in the OKS, KSS and SF-12v2 scores. Any differences in range of motion were not reflected in the subjective functional outcomes, Hanusch said.
Although there were a few complications in both groups, two patients in the high flexion group required secondary patellar resurfacing, she said and noted she was uncertain if the complications were a problem related to the implant design. However, the senior investigator recommended carrying out primary patella resurfacing when using the high flexion design, Hanusch said. – by Renee Blisard Buddle
- Reference:
- Hanusch BC. Paper #69. Presented at: British Orthopaedic Association Congress; Sept. 11-14, 2012; Manchester.
- For more information:
- Birgit C. Hanusch, MSc, MRCS, can be reached at Orthopaedic Research Office, Academic Centre, James Cook University Hospital, Marton Road, Middlesborough, TS4 3BW, United Kingdom; email: bhanusch@doctors.org.uk.
Disclosure: Hanusch has no relevant financial disclosures.