Can Adding EMS Speed Up Recovery After Knee Replacement? A Turkish Randomized Study Published in a Japanese Physical Therapy Journal

person Savannah Martin
calendar_today Jan 26, 2026
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Welcome to another entry in the ORIEMS FIT RESEARCH DIGEST series.

In this series, we share interesting and sometimes surprising research about electrical muscle stimulation—in simple language.
Our goal is to spark curiosity, encourage self-learning, and help everyday readers enjoy real science.

This article is a simplified explanation of a real research paper.

At the end of this post, you’ll find a link to the original PDF so you can read, collect, or fact-check it yourself.

How to Read This Blog

This article is a simplified educational summary of a scientific research paper.
It is written to help everyday readers understand what researchers studied and observed.

This blog post is NOT a substitute for reading the original research paper.
Important details, limitations, and full scientific context can only be found in the original publication.

Readers who want full accuracy or technical detail should read the original study directly.

Research Details (Q&A Format)

What type of electrical stimulation is this?

This study is about NMES (Neuromuscular Electrical Stimulation).
NMES is a type of electrical stimulation used to activate muscles.

Who did this research, and when?

The study was done by a team led by Demet Tekdos Demircioglu with colleagues Nurdan Paker, Elif Erbil, Derya Bugdayci, and Tuluhan Yunus Emre.
It was submitted in March 2015 and accepted in May 2015.

Which country and hospitals did it come from?

This was a Turkish clinical study based in Istanbul, Turkey, involving:

Memorial Hizmet Hospital (Physical Medicine & Rehabilitation)
Istanbul Physical Medicine and Rehabilitation Educational and Research Hospital
Memorial Hizmet Hospital (Orthopaedia & Traumatology)

Who was studied?

The paper reports 60 patients with knee osteoarthritis who were scheduled for total knee arthroplasty (knee replacement).
They were recruited in Istanbul between September 2006 and April 2007.

What was done in the study?

Patients were randomized into two groups (by coin flip):

Control group: home exercise program after surgery
NMES group: the same rehab + NMES added

The NMES protocol was:

30 minutes per session
5 days per week
for 4 to 6 weeks
stimulation applied to the vastus medialis (a key quadriceps muscle)

The device details included:

current intensity adjusted roughly 28 mA to 90 mA (tolerance-based)
frequency varied 30 to 100 Hz

What did they measure?

They measured outcomes before surgery, then at Month 1 and Month 3 after surgery, using:

WOMAC (knee pain/stiffness/function questionnaire)
SF-36 (quality-of-life questionnaire)
Timed Up and Go test (mobility test)
VAS pain scale

Why This Study Is Different

Unique angle: this study did not ask, “Does NMES help eventually?”
It asked something more specific:

Can adding NMES help people feel and function better faster—as early as the first month after knee replacement?

That “speed of early improvement” focus is what makes it stand out.

What Was Observed (Simple, With Real Numbers)

1) WOMAC scores shifted more at Month 1 in the NMES group

From the paper’s main comparison table (Table 3):

WOMAC pain (NMES): 78.8 → 61.8 → 42.8
WOMAC pain (exercise only): 90.7 → 83.5 → 48.5
WOMAC stiffness (NMES): 85.8 → 70.4 → 42.9
WOMAC stiffness (exercise only): 92.1 → 76.7 → 47.9
WOMAC total (NMES): 78.5 → 53.4 → 42.3
WOMAC total (exercise only): 84.7 → 77.3 → 47.2

The authors reported the Month 1 WOMAC differences between groups as statistically significant (they list p-values such as p=0.00 at Month 1 for several WOMAC comparisons).

2) Quality-of-life scores (SF-36) rose faster at Month 1 with NMES

From the same table:

SF-36 physical score (NMES): 36.1 → 59.6 → 68.5
SF-36 physical score (exercise only): 35.9 → 44.4 → 67.8
SF-36 mental score (NMES): 44.8 → 71.9 → 65.1
SF-36 mental score (exercise only): 48.5 → 58.6 → 60.9
SF-36 total (NMES): 39.9 → 66.6 → 68.0
SF-36 total (exercise only): 39.8 → 50.7 → 67.8

The abstract also summarizes that the NMES group showed better early improvements in functional status and quality of life after surgery.

Practical Interpretation (Non-Medical)

This study helps us understand something practical about movement recovery:

When a muscle is “hard to wake up” after major surgery, researchers test tools like NMES to see if it may support earlier muscle engagement alongside normal rehab.

This is not a promise of outcomes.
It is one study’s observation under a specific program and follow-up window.

Study Information

Original research paper title:
The effect of neuromuscular electrical stimulation on functional status and quality of life after knee arthroplasty: a randomized controlled study

Simplified paper title:
Can Adding NMES Help People Improve Faster After Knee Replacement?

Journal / Publisher:
Journal of Physical Therapy Science (published by The Society of Physical Therapy Science; Japan-based journal platform).

DOI:
DOI not publicly available at time of writing.

Why the source is trustworthy:
This is a peer-reviewed journal article with clearly described methods, outcomes, and a controlled comparison design.

Link to the full study PDF:
https://www.jstage.jst.go.jp/article/jpts/27/8/27_jpts-2015-228/_pdf/-char/en

Summary Table

Item	Details
Study focus	NMES added to rehab after total knee arthroplasty
Participants	60 knee osteoarthritis patients in Istanbul (2006–2007)
Intervention	30 min NMES, 5 days/week, 4–6 weeks + standard rehab
Key observations	Larger Month 1 shifts in WOMAC and SF-36 scores in NMES group
Unique angle	Focus on speed of early improvement (Month 1 outcomes)
Interpretation note	Observational summary of a controlled study, not a guarantee
Required note	This table summarizes selected observations only. Full context is available in the original research paper.

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