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Related Experiment Video

Updated: Jul 15, 2026

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
07:33

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

Published on: May 5, 2023

A randomized, prospective study of primary total knee components designed for increased flexion.

Steven H Weeden1, Robert Schmidt

  • 1Texas Hip and Knee Center, Texas Hip and Knee Center Adult Reconstruction Fellowship Program, Fort Worth, Texas, USA.

The Journal of Arthroplasty
|April 3, 2007
PubMed
Summary

New posterior-stabilized (PS) knee implants designed for increased flexion significantly improved range of motion (ROM) after total knee arthroplasty compared to standard PS implants.

Related Concept Videos

Knee Joint01:23

Knee Joint

The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Total knee arthroplasty (TKA) aims to restore function and alleviate pain.
  • Achieving optimal range of motion (ROM) post-TKA is crucial for patient satisfaction.
  • Standard posterior-stabilized (PS) implants are widely used, but limitations in flexion may exist.

Purpose of the Study:

  • To compare early range of motion (ROM) outcomes between standard PS implants and PS implants designed for increased flexion after primary total knee arthroplasty.

Main Methods:

  • Prospective, randomized study design.
  • Two groups of patients undergoing primary TKA: Group A (standard PS implants), Group B (PS implants for increased flexion).
  • Preoperative and 12-month postoperative ROM measurements were recorded.

Related Experiment Videos

Last Updated: Jul 15, 2026

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
07:33

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

Published on: May 5, 2023

Main Results:

  • Group B demonstrated significantly greater average ROM (0.6° to 133°) compared to Group A (0.6° to 120°) at 12 months (P < .05).
  • A significantly higher proportion of patients in Group B achieved flexion greater than 135° (P < .05).
  • Fewer patients in Group B (8%) failed to regain preoperative ROM compared to Group A (48%) (P < .05).

Conclusions:

  • Early results suggest PS implants designed for increased flexion enhance postoperative ROM after TKA.
  • These specialized implants may help more patients achieve or exceed their preoperative range of motion.
  • Further long-term follow-up is warranted to confirm sustained benefits.