ClinicalTrials.gg
RecruitingNCT06925880CREARUpdated Mar 30, 2026

Effect of Micronized Creatine Monohydrate on Muscle Mass, Strength and Performance in Older Adults Submitted to Total Knee Arthroplasty

An interventional study of Creatine Monohydrate and Placebo in Sarcopenia in Elderly, Frailty at Older Adults and Functional Capacity, sponsored by Consorci Sanitari del Maresme. Recruiting at 1 site in Spain. Open to participants aged 65 Years and older. Per ClinicalTrials.gov, last updated 2026-03-30.

Sponsored by Consorci Sanitari del Maresme · Not applicable, Interventional, and Treatment

From the registry’s dates

  • Started Jun 2025; still recruiting 1 year 5 months later.
Phase
Not applicable
Study type
Interventional
Enrollment
262
Allocation
Randomized
Ages
65 Years and older
Sex
All
01

Where this study stands

Counted across the records on this site · 2026-11-13

Among 132 studies in Frailty with a site in Spain — 46 open to participants now, 54 under way, none of them phase 3. Frailty · Spain.

Planned enrollment
13th of 96
262 · median 90
Started
2025
with 15 others
No phase
93 of 132
34 open now
Primary completion
2027-05
later than 38 of 53 live
Registered
84th of 132
by date
Lead sponsor
3 of 132
Consorci Sanitari del Maresme

Among the 132 studies in Frailty with a site in Spain, this one is the 13th largest by planned enrollment of the 96 interventional ones that give a count, is one of 16 that started in 2025, is one of 93 with no phase, reaches primary completion later than 38 of the 53 other live ones, and was the 84th registered.

Frailty

1,284 studies on the registry are indexed under Frailty; 451 are open to participants now.

Browse Frailty studies →

Open to participants now

46 of the 132 studies in Frailty with a site in Spain are open now. Recruiting first, the newest first:

40 more — sign in →

All 46 open studies →

A study can be open while its sites in Spain have not opened yet or have stopped. Only those recruiting at a site in Spain →

Who these studies take

Of the 299 Frailty studies recruiting now, 235 (79%) set no upper age limit and 9 (3%) stop at 75 or younger; 7 take children under 18; 66 take healthy volunteers.

This study: 65 Years and older · all sexes · no healthy volunteers.

The full table on the hub →

This tab as a report to print or save as PDF → With an account.

Was this useful?
Watch this landscapeDownload CSVNarrow it in search →With an account: a weekly mail of what changed among 132 studies in Frailty with a site in Spain, or all of them as a file.
02

Study summary

Double-blind randomized placebo-controlled clinical trial with two parallel arms. The main objective is to evaluate the efficacy and safety of creatine supplementation in older adults who have been operated on for total knee arthroplasty and undergoing a usual rehabilitation program. The intervention will consist of daily creatine monohydrate supplementation for 12 weeks. The intervention will start after surgery with a loading dose of 20g/day for 1 week and then continue with a maintenance dose of 5g/day for 11 weeks.

Main outcome mesures included muscle mass, muscle strenght, sarcopenia, frailty, functional capacity and physical performance and will be assessed at baseline, 3 and 6 months follow-up.

03

Conditions studied

  • Sarcopenia in Elderly
  • Frailty at Older Adults
  • Functional Capacity
  • Creatine Supplementation
  • Arthroplasties, Knee Replacement
  • Physical Performance
04

Who can participate

Ages eligible
65 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Persons 65 years of age or older who have been operated on for the first time for total knee arthroplasty,
  • who are undergoing an outpatient rehabilitation program according to standard clinical practice,
  • who sign the form.

Exclusion criteria

Exclusion Criteria:

  • Chronic renal disease at stage G3b or higher or \<30 ml/min/1.73m2.
  • Hepatic insufficiency, cirrhosis.
  • Neuromuscular and neurodegenerative diseases (amyotrophic lateral sclerosis, multiple sclerosis, muscular dystrophy, myasthenia gravis, Parkinson's disease, etc.).
  • Severe or very severe (COPD) (GOLD III-IV).
  • Moderate or severe chronic heart failure ( 3-4).
  • Central sensitivity syndrome (fibromyalgia and chronic fatigue syndrome).
  • Moderate or severe cognitive impairment (GDS≥4).
  • Moderate-severe dependence for basic activities of daily living (preintervention Barthel index \<60 points).
  • Hemiparesis, amputation or malformation of any limb.
  • Consumption of creatine monohydrate supplements in the last 6 months.
Terms in these criteria, in plain language(4)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

GFR and eGFR (kidney filtering)

GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².

Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.

COPD

Chronic obstructive pulmonary disease: long-term lung disease that makes it hard to breathe out, including emphysema and chronic bronchitis.

NYHA class (heart failure)

The New York Heart Association’s four classes of how much heart failure limits physical activity.

I
No limits: ordinary activity causes no undue tiredness or breathlessness.
II
Slight limits: comfortable at rest, ordinary activity causes symptoms.
III
Marked limits: comfortable at rest, less than ordinary activity causes symptoms.
IV
Symptoms even at rest; any activity makes them worse.

Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.

05

Study design

Phase
Not applicable
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Double (Participant, Investigator)
Enrollment
262 participants (estimated)

Study arms

  • Experimental
    CREATINE

    The intervention will consist of daily supplementation with micronized creatine monohydrate for 12 weeks. The intervention will start at the time of hospital discharge with a loading dose of 20g/day for 1 week. Subsequently, a maintenance dose of 5g/day will be continued for 11 weeks.

    Dietary Supplement: Creatine Monohydrate

  • Placebo comparator
    PLACEBO

    The control group will follow the same rehabilitation regimen as the intervention group and will receive a placebo. It will start at the time of hospital discharge with a loading dose of 20g/day for 1 week. Subsequently, a maintenance dose of 5g/day will be continued for 11 weeks.

    Other: Placebo

Interventions

  • Dietary supplementCreatine Monohydrate

    The intervention will consist of daily supplementation with micronized creatine monohydrate (FullGas Sport Creatine 200 mesh) for 12 weeks. The intervention will start at the time of hospital discharge with a loading dose of 20g/day for 1 week, divided into 4 intakes of 5g to favor digestive tolerance (breakfast, lunch, snack and dinner). Subsequently, a maintenance dose of 5g/day will be continued for 11 weeks (breakfast). Creatine should be consumed with food to improve its absorption.

  • OtherPlacebo

    The control group will follow the same rehabilitation regimen as the intervention group and will receive a placebo with FullGas Sport microcrystalline cellulose. Its physical and organoleptic characteristics are the same as micronized creatine monohydrate. The dosage will be the same as that indicated for the study intervention: it will start at the time of hospital discharge with a loading dose of 20g/day for 1 week, divided into 4 intakes of 5g to favor digestive tolerance (breakfast, lunch, snack and dinner). Subsequently, a maintenance dose of 5g/day will be continued for 11 weeks (breakfast).

06

What researchers measure

Primary outcomes

  1. Change in muscle mass

    Mesured by Bioimpedance Analysis

    Time frame: Baseline, 3 and 6 months follow-up

  2. Change in Muscle Strenght

    Handgrip mesured by Jamar Dynamometer

    Time frame: Baseline, 3 and 6 months follow-up

  3. Change in the prevalence of Sarcopenia

    Mesured by EWGSOP2 criteria

    Time frame: Baseline, 3 and 6 months follow-up

  4. Change in Functional Capacity

    Mesured by Barthel score

    Time frame: Baseline, 3 and 6 months follow-up

  5. Changes in Performance

    Mesured by Timed Up and Go Test (seconds)

    Time frame: Baseline, 3 and 6 months follow-up

  6. Changes in Physical Performance

    Mesured by Short Physical Performance Batery (SPPB)

    Time frame: Baseline, 3 and 6 months follow-up

  7. Changes in aerobic capacity

    Mesured by 6 minutes Walking Test (meters)

    Time frame: Baseline, 3 and 6 months follow-up

  8. Changes in Walking Speed

    Mesured by Gaid Speed

    Time frame: Baseline, 3 and 6 months follow-up

  9. Number of Advers Health Events

    Register of advers health events

    Time frame: Baseline, 3 and 6 months follow-up

Secondary outcomes

  1. Change in Frailty status

    Mesured by Linda Fried criteria (0 positive criteria: robust, 1-2: pre-frail positive criteria, 3 or more positive criteria: frail)

    Time frame: Baseline, 3 and 6 months follow-up

  2. Arthroscopy complications

    Time frame: Baseline, 3 and 6 months follow-up

07

Study locations

1 of 1 sites recruiting
  • Elisabet Palomera
    Mataró, Barcelona 08304, Spain
    Recruiting
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Started Jun 2025 (actual). Primary completion is estimated for May 2027, 23 months after the start.

Of 513 non-industry interventional studies with no phase under Frailty, half reached primary completion within 22 months of starting (the median), counting those still running; a quarter within 11 and three quarters within 39. This study's planned 23 months is close to that.

Counting every sponsor, half of 517 studies reached it within 22 months; a quarter within 10 and three quarters within 39.

How these figures are worked out, and which studies are left out of them.

Registered
Mar 27, 2025
First posted
Apr 13, 2025
StartActual
Jun 10, 2025
Primary completionEst.
May 31, 2027
CompletionEst.
Oct 31, 2027
Last update
Mar 30, 2026
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Mar 30, 2026, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT06925880
Lead sponsor
Consorci Sanitari del Maresme
Collaborators
Fundació Privada Salut del Consorci Sanitari del Maresme
Responsible party
Sponsor
First posted
Apr 13, 2025
Start date
Jun 10, 2025
Primary completion
May 31, 2027 (estimated)
Completion
Oct 31, 2027 (estimated)
Last update
Mar 30, 2026

Study contacts

Jéssica Martínez Rodríguez
Contact
jmartinezro@csdm.cat
0034 937417700 ext. 2282
Jéssica Martínez Rodríguez
principal investigator · Consorci Sanitari del Maresme
Mateu Serra-Prat, PhD
study director · Consorci Sanitari del Maresme

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Interested in this study?

Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.

Contact study team

Follow this study

Get an email when the registry record changes — status, dates, results — or when someone posts here.

Sign in to follow

Discussion

Questions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.

Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.

Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.

Studies of the drug tested here: Creatine monohydrate

Start the discussion