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In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
Published on: May 5, 2023
Effect of implant design on knee flexion
Douglas A Dennis1, R David Heekin, Charles R Clark
1Colorado Joint Replacement, Denver, CO 80210, USA.
The Journal of Arthroplasty
|December 11, 2012
Summary
This study found that posterior stabilized high flexion knee devices offer slight motion benefits over standard devices after total knee arthroplasty. Patients with less pre-operative knee flexion may benefit most from the high flexion device.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Knee Biomechanics
Background:
- Total knee arthroplasty (TKA) aims to restore knee function and alleviate pain.
- Posterior stabilized (PS) knee implants are commonly used in TKA.
- High flexion (HF) devices are designed to potentially improve range of motion post-TKA.
Purpose of the Study:
- To compare the efficacy of posterior stabilized high flexion (PSHF) devices versus posterior stabilized standard (PSS) devices in TKA.
- To evaluate non-weight-bearing passive flexion and weight-bearing single leg active flexion as outcome measures.
- To identify patient subgroups that may benefit more from PSHF devices.
Main Methods:
- A randomized controlled trial involving 93 subjects (186 knees) undergoing simultaneous bilateral TKA.
- Comparison of PSHF device in one knee versus PSS device in the contralateral knee.
- Assessment of knee motion metrics at 12 months post-surgery with 92.5% follow-up compliance.
Main Results:
- Small but statistically significant superiority in motion metrics for the PSHF device compared to the PSS device at 12 months.
- Enhanced benefits observed in patients with pre-operative flexion less than 120°.
- Non-weight-bearing passive flexion demonstrated superiority for the PSHF group.
Conclusions:
- The PSHF device demonstrates a modest advantage in knee motion post-TKA compared to the PSS device.
- Patients with limited pre-operative knee flexion are potential ideal candidates for PSHF implants.
- Further research may refine patient selection for advanced knee arthroplasty devices.
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