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Updated: Apr 22, 2026
07:33
In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
Published on: May 5, 2023
1.3K
Patients achieved greater range of movement when using high-flexion implants
Canfeng Li1, Yi Zeng, Bin Shen
1The Orthopedic Department, West China Hospital, Sichuan University, Chengdu, China.
Summary
The NexGen LPS-Flex prosthesis offers greater range of motion after total knee arthroplasty compared to the standard LPS prosthesis. However, functional outcomes and complication rates were similar between the two implant types.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Clinical Trials
Background:
- NexGen Legacy Posterior Stabilized high-flexion prostheses (LPS-Flex) are increasingly used in total knee arthroplasty (TKA).
- Advocates suggest LPS-Flex prostheses improve postoperative knee flexion compared to standard NexGen Legacy Posterior Stabilized (LPS) prostheses.
- Evidence comparing range of motion and functional outcomes is crucial for clinical decision-making.
Purpose of the Study:
- To systematically review and summarize the best available evidence comparing range of motion (ROM) and functional outcomes.
- To evaluate the efficacy of LPS-Flex prostheses versus LPS prostheses in total knee arthroplasty (TKA).
Main Methods:
- Systematic search of electronic databases for randomized controlled trials (RCTs) up to July 2014.
- Methodological quality assessment and independent data extraction by two authors.
- Inclusion of nine studies with a total of 978 knees.
Main Results:
- LPS-Flex group demonstrated significantly greater postoperative ROM (1.62 degrees) compared to the LPS group.
- No statistically significant differences were found in total Knee Society Score (KSS), functional KSS, Hospital for Special Surgery (HSS) scores, complications, or radiolucent lines.
- Pooled mean differences: total KSS -0.64, functional KSS -0.53, HSS 0.23, complications 0.49, radiolucent lines 1.56.
Conclusions:
- NexGen LPS-Flex prosthesis offers increased range of motion without significant increases in complications or radiographic issues.
- Clinical advantages were not demonstrated in KSS or HSS scores.
- Patient selection for high-flexion prostheses should consider individual factors like motivation and preoperative ROM; further large-scale RCTs are needed.
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