Knee Osteoarthritis
Conditions
Brief summary
Dysbiosis of the gut microbiota is believed to contribute to the development and progression of osteoarthritis (OA), suggesting a role for probiotics in the treatment of OA. Animal studies have shown that certain probiotic strains decrease the inflammatory responses, pain sensitization and OA progression. There are, however, few clinical studies in humans to support this. In this double-blinded randomized controlled trial we will investigate the effect of 6-months probiotic supplements compared to placebo on OA related outcomes in females with diagnosed knee OA.
Detailed description
Aim: To investigate the effect of 6-months probiotic supplements compared to placebo on OA related outcomes in females with diagnosed knee OA. Design: Double-blinded randomized placebo controlled trial Study arms: One treatment arm will receive probiotic supplement in opaque white capsules and the other treatment arm will receive identical opaque placebo capsules. The placebo product will contain maize starch powder. Study participants will take one capsule daily for six months. Statistical analysis Main outcome: The independent T-test will be used to evaluate group differences in change in KOOS-12 scores between baseline and 6-months follow-up, given that all assumptions for parametric tests are satisfied. If assumptions are not met or if there are differences in baseline characteristics due to imbalanced randomization the Mann-Whitney U-test or regression analysis will be used as appropriate. Secondary and explorative outcomes: The independent T-test (continuous, normal distributed data), the Mann-Whitney U-test (ordinal, non-normally distributed data) and cross-tabulations with Chi2 test (nominal data) will be used to evaluate differences in secondary and explorative outcomes between the two groups. Estimated enrollment: 86 participants. Based on the ability to detect a 10-point difference in KOOS-12 with 80% power and α 0.05, 70 participants (35 per arm) will be needed. With an approximate drop-out rate of 20% from baseline to follow-up, 86 participants will be recruited. Investigators: Eva Ageberg, PT, PhD, Professor in physical therapy, Lund University, Sweden (Principal investigator), Anna Cronström, physical therapist, PhD, Lund University, Sweden and Jessica Neilands, PhD, Associate Professor, Science manager, Probi AB, Lund, Sweden.
Interventions
DIETARY_SUPPLEMENTProbiotic supplements
See arm/group description
DIETARY_SUPPLEMENTPlacebo supplements
See arm/group description
Sponsors
Lund University
Probi AB
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
OTHER
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
FEMALE
Age
45 Years to 70 Years
Healthy volunteers
No
Inclusion criteria
1. Females aged 45-70 years 2. Clinical diagnosis of knee OA 3. Mild to moderate knee joint pain (Visual Analog Scale (VAS) 3-7)) during the last 3 months 4. Able to perform walking and stair tests 5. No use of other supplements/food products containing probiotics and/or supplements targeting OA symptoms (e.g., glucosamine, turmeric) 6. Able to write and understand Swedish.
Exclusion criteria
1. Rheumatoid arthritis or other active generalised inflammatory comorbidities affecting the gastrointestinal tract (IBD, celiac disease) 2. Performed a total knee replacement on the affected knee or on waiting list for joint replacement 3. Other concomitant injuries or surgeries overriding the OA knee symptoms 4. Other concomitant injuries or diseases where physical activity is a contra indication 5. Malabsorption disorders, presence of renal and/or hepatic failure 6. Use of corticosteroids with doses above 10 mg/day and/or Intra-articular injections during the previous 6 months 7. Heavy use of alcohol (\>10 standard units a week), or recreational drug use 8. BMI ≥30 Kg/m2 9. Antibiotic treatment during the previous 2 months 10. clinical depression diagnosis 11. Pregnancy/breast feeding 12. Smoking or other nicotine containing products during the previous 6months 13. Performed a gastric bypass 14. Immunosuppressive treatment or impaired immune system 15. Chronic or acute diarrhoea 16. Blood/plasma donation/transfusion during the 3months or during the study 17. Non-controlled diabetes 18. Allergy with regards to any of the study product ingredients.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Knee injury and Osteoarthritis Outcome Score (KOOS)-12 | 6 months | Change in the KOOS-12 (total score) from baseline to 6 months in the probiotic group compared with the placebo group. The KOOS-12 is scored from 1-100 (worst-best) scale. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Molecular biomarkers for cartilage degeneration and inflammation. | 6 months | Comparison of the probiotic group with the placebo group in terms of changes from baseline and 6-month follow-up in molecular biomarkers for cartilage degeneration and inflammation. |
| Knee injury and Osteoarthritis Outcome Score (separate subscale score) | 3 to 6 months | Comparison of the probiotic group with the placebo group in terms of changes from baseline to 3-month and 6-month follow-up in Scores on the separate subscales (pain, symptoms, activity of daily living, sport/recreation and knee-related quality of life) from the full KOOS questionnaire. The KOOS is scored from 1-100 (worst-best) scale. |
| Visual Analogue Scale (VAS) | 3 to 6 months | Comparison of the probiotic group with the placebo group in terms of changes from baseline to 3-month and 6-month follow-up in VAS scores (pain severity), assessed on an ordinal scale from 0 to 10 where 0 indicates no pain and 10 worst possible pain the last week |
| Work Productivity and Activity Impairment questionnaire (WPAI) | 3 to 6 months | Comparison of the probiotic group with the placebo group in terms of changes from baseline to 3-month and 6-month follow-up in WPAI. The WPAI questionnaire includes 6 questions regarding employee's absenteeism, reduced job performance, work productivity loss, and activity impairment. WPAI outcomes are expressed as impairment percentages, with higher numbers indicating greater impairment and less productivity, i.e., worse outcomes. |
| Patient Acceptable Symptom State (PASS) | 3 to 6 months | Comparison of the probiotic group with the placebo group in terms of changes from baseline to 3-month and 6-month follow-up in PASS. The PASS involves a question regarding if the patient is satisfied with their current knee function with to response options (yes/no) |
| Pain-relieving medication intake | 3 to 6 months | Comparison of the probiotic group with the placebo group in terms of changes from baseline to 3-month and 6-month follow-up in pain-relieving medication intake. Here the patients reports the type and dosage of any medication |
| Wish for surgery | 3 to 6 months | Comparison of the probiotic group with the placebo group in terms of changes from baseline to 3-month and 6-month follow-up in wish for surgery. The patients are asked if they wish to undergo surgery due to their knee problems (yes/no). |
| 40m fast paced walk test | 6 months | Comparison of the probiotic group with the placebo group in terms of changes from baseline and 6-month follow-up in 40m fast paced walk test, assessed as time taken to walk 4x10 meter as fast as possible |
| 30 seconds sit to stand test | 6 months | Comparison of the probiotic group with the placebo group in terms of changes from baseline and 6-month follow-up in the 30 seconds sit to stand test, assessed by the number of repetitions of sitting to standing from a chair during a period of 30 second. |
| 3 minute walk test | 6 months | Comparison of the probiotic group with the placebo group in terms of changes from baseline and 6-month follow-up in the 3 minute walk test, assessed as distance walked during 3 minutes on a treadmill. |
| Stair climb test | 6 months | Comparison of the probiotic group with the placebo group in terms of changes from baseline and 6-month follow-up in the stair climb test, assessed as time taken to ascend and descend a flight of 5 stairs. |
Countries
Sweden
Contacts
PRINCIPAL_INVESTIGATOREva Ageberg
Lund University
Outcome results
None listed