Probiotics for Modic Changes in Low Back Pain Patients
Condition: Low Back Pain
MeSH terms: Back Pain; Low Back Pain
Study type: Interventional

Summary: 
      Probiotics for spinal inflammatory end-plate changes, so-called Modic changes, a randomised
      controlled study

      Modic changes are inflammatory end-plate changes primarily affecting the lower lumbar levels.
      They are associated with disc degeneration, disc herniation and age, and are only seen on
      magnetic resonance imaging of the lumbar spine, not on X-ray. Three different types of Modic
      changes have been described, type 1, 2 and 3, the latter being rare [5]. It has been shown
      that type 1, but not type 2, is associated with more intense low back pain (LBP) and worse
      LBP outcome including a lower rate of return to work [7]. In addition, more inflammatory
      cells have been identified in this type of structural abnormality [25]. Modic changes may
      affect up to 20% of the general population and more than the double proportion in clinical
      populations, type 1 and 2 being about equally represented [6]. The investigators have
      estimated that at least 5,000 of the patients, who are referred to secondary health care in
      Denmark for LBP per year, will suffer from type 1 Modic changes.

      Based on a hypothesis of infection as the cause of Modic changes, a randomised clinical trial
      with one year follow-up has been performed [16]. This trial documented significant effect of
      long-term (100 days) broad-spectrum antibiotic treatment (amoxicillin/ clavulanic acid) in
      patients with type 1 Modic changes. However, infection in Modic changes has not been
      documented convincingly in this or in other studies, and almost all of the treatment effect
      occurred after the antibiotic treatment was stopped. As yet, the study has not been
      replicated. The investigators hypothesize that the treatment effect may have been caused by
      an effect on the gut microbiom possibly explaining the delay of the effect.

      Probiotics have been shown to influence interleukins in patients with inflammatory conditions
      and in healthy volunteers [32, 36, 37].

      The investigators are therefore performing a randomised trial to study the clinical effect of
      probiotics on type 1 Modic changes as well as the effect on interleukin levels. The trial is
      designed as a randomised, clinical, double blind, placebo-controlled trial taking place at
      the Spine Center, Silkeborg Regional Hospital. Power calculation was based on a smaller
      treatment effect than the effect found in the study above and resulted in the requirement of
      including 94 patients. One-year follow-up is planned.

      The investigators use lactobacillus rhamnosus GG (Dicoflor®) for the trial, as this strain
      has been used in several clinical studies. The dietary supplement has been shown to influence
      relevant interleukins significantly, and it has been proven to be stable in action and safe,
      also in pregnancy.

      A positive result of such a trial may have significant consequences. The perspective of using
      probiotics instead of antibiotics in this common disorder is very attractive. At the time
      being, many type 1 Modic patients in Denmark and other western countries are treated with
      antibiotics. This is of great concern because of side effects and possible drug resistance
      development of bacteria.

      The Technology Transfer Office of Aarhus University is involved.
    

Detailed description: 
      Background information on trial preparation The bacteria Lactobacillus rhamnosus GG is an
      anaerobic gram-positive rod that among other areas exists as a part of the body's normal
      intestinal flora. In the intestine the bacteria breaks down carbohydrates to form lactic
      acid. The bacteria is tolerant to low pH conditions.

      Lactobacillus rhamnosus are used in industrial processing of milk products, and medically as
      a probiotic in order to balance the natural intestinal flora.

      Lactobacillus rhamnosus is considered to be very safe and has been used during pregnancy in
      several studies [1, 2]. However, two cases of sepsis have been reported when using this
      probiotic [1, 2], one case in a patient with diabetes and one case in a heart-surgery
      patient.

      Purpose In a placebo-controlled randomized study

        -  To examine whether there are effects of prolonged treatment with probiotics in patients
           with prolonged back pain and type 1 Modic changes in the lumbar spine.

        -  To examine whether there can be measured a change in immunological activity in relation
           to treatment, and whether this change is related to the treatment with probiotics.

        -  To examine whether type 1 Modic changes transform differently on magnetic resonance
           imaging (MRI) during the first year in participants receiving probiotics as compared to
           participants who did not receive probiotics.

      Hypotheses

        1. This study will be able to show the effect of 100 days of continuous treatment with
           Lactobacillus rhamnosus GG in participants with back pain of more than 3 months duration
           and type 1 Modic changes.

        2. It can be shown that there is a difference in the activity of the immune system measured
           by Interleukin 6 (IL-6), interleukin 10 (IL-10) and TNF-alpha dependent on whether
           participants where treated with placebo or Lactobacillus rhamnosus GG.

        3. On MRI, Modic changes in the probiotic group more often will change from type 1 to type
           2 as compared to the control group during the first year.

      Background Modic changes (MC) are inflammatory changes in the end plates of the vertebrae,
      also known as end plate edema [3]. MC occur at a median of 6% in the general population and a
      median of 43% in clinical populations in the secondary sector [4]. In patients on sick leave
      do to lumbar back pain MC is detected in 60% [5]. The changes can be seen on MR imaging, but
      not on X-ray [3].

      MC occur more frequently in patients who have had a herniated disc and rarely occur when
      there are no degenerative changes in the discs [6, 7]. They usually occur at the level of
      L4-5 and L5-S1 and more frequently with age like degenerative changes [6].

      MC are divided into types 1, 2 and 3, the latter being rare. The classification is based on
      histology and configuration on MR imaging [3, 7]. Histologically, fissures and granulation in
      the end plate characterize type 1. In type 2 the destruction of the end plate is more
      pronounced and there is a fatty degeneration extending into the bone marrow. In type 3 there
      is a sclerosing of the bone tissue, which is also visible in x-rays, but can also have
      another cause. On MRI, type 1 changes are low signalling on T1-weighted sequences and high
      signalling on T2-weighted sequences, whereas type 2 changes are high signalling in both
      sequences. Type 3 changes appear as low signalling on both T1 and T2-weighted sequences [8].
      In addition, there are a so-called mixed type Modic changes with both type 1 and 2 in the
      same lesion. Finally, Type 1 and Type 2 may occur in different vertebrae in the same patient
      [9]. Type 2 are usually seen more often, but may also occur less frequent in some patient
      populations. According to the literature, about 40% of MC type 1 change into type 2, up to
      20% may disappear again, and 40-50% remained stable or increase in size during 1-2 years.
      Type 2 and 3 may remain unchanged, disappear or change to a different type. Major changes
      remain more stable than small change [9]. It has been shown that type 1, including the mixed
      type, can result in severe degenerative changes [10].

      In cross-sectional studies MC are more closely associated with pain than other degenerative
      changes in the spine, particularly type 1 [11, 12]. Patients with type 1 MC more often wake
      up at night because of pain and are often bothered by more than one hour of morning stiffness
      (inflammatory back pain). They also often experience pain in extension [13]. There have
      published three studies including patients with type 1 MC clearly showing that type 1 MC is
      associated with a poor one-year prognosis in regard to disability and pain [7, 11, 16], and
      Modic changes have been shown to be an independent risk factor for a severe episode of back
      pain [17]. Other degenerative manifestations hardly seem to adversely affect the prognosis
      [14]. Finally, the investigators have shown that type 1 MC is associated with increased risk
      of unsuccessful return to work also when adjusted for other established risk factors [5].
      Another cohort study showed no prognostic significance of MC probably due to a low prevalence
      of MC in that study (14%) [15].

      Previous treatment of MC Since MC represent areas of inflammation, it has been recommended
      that patients with MC should be less physically active and avoid weight load [16]. However, a
      controlled, prospective study did not show differences in pain and function after a program
      focusing on rest, compared with the usual active training program for lower back pain, which
      is why this advice is no longer relevant [17].

      There are casuistic reports on temporary effect of treatment with corticosteroids, either as
      tablets or injection into the disc, but no controlled studies [13]. Some retrospective cohort
      studies [18, 19] have suggested a better effect of the back surgery in patients with type 1
      compared with other patients, but other studies have suggested a lower rate of healing [9,
      23]. There are no randomized prospective studies on this subject.

      Infection hypothesis There is no evidence of bacteria in MC [20], but there is evidence of an
      increased number of TNF-immunoreactive cells in type 1 changes as compared to type 2 changes
      [25].

      Some studies have identified bacteriae in disc tissue in up to 50% of patients underwenting
      surgery for herniated disc, most frequently Proprionibacterium acnes, which is usually a
      benign skin bacteria [21]. These findings have led to the hypotheses of a low-grade infection
      as a possible cause of MC, since disc herniation has been shown to be a risk factor for
      subsequent occurrence of MC.

      An uncontrolled study suggested effect of Bioclavid treatment [22], a commonly used drug
      amoxicillin and clavulanic acid, which is commonly used for exacerbation of chronic
      obstructive pulmonary disease. January 2013, the results of a double-blind, randomized
      clinical trial with 1 year follow-up was published comprising of 160 patients with type 1 MC
      showing efficacy of treatment with Bioclavid, 1 tablet twice daily for 100 days. There were
      only moderate differences in pain and function during the treatment period with antibiotics,
      but increasing difference between intervention and control group during the follow-up period
      the following 9 months [16]. The treatment duration was chosen pragmatically from current
      practice in patients with spondylodiscitis. However, Modic patients do not have fever or
      elevated sedimentation rate. Included were only patients with verified herniated disc ½ - 2
      years previously, patients with pain of more than 6 months duration and back pain intensity
      the previous 2 weeks ≥ 6 of 10. More than half of the patients had gastrointestinal side
      effects, but there were no serious adverse effects.

      The very modest impact of antibiotics during the first 100 days, but subsequently pronounced
      effect during the follow-up period, gave the present investigators reason to assume that the
      treatment effect was not caused by the antibiotic treatment itself, but rather by the
      consequent changes of the intestinal flora. Usually, the effect antibiotic treatment in
      infections occur more more rapidly.

      Activation of the immune system IL-6 is a marker of inflammation, and plasma IL-6 can be
      increased both by infections and by autoimmune activation [23]. Recent studies suggest that
      the IL-6 by disc degeneration plays a role in the interaction with other cytokines,
      particularly IL-1 and TNF-alpha [24], and in particular for the activation of macrophages
      [25]. A cross-sectional study in patients with low back pain has shown an association between
      IL-6 concentration, pain and poor sleep quality [26]. By measuring changes in IL-6 levels in
      relation to treatment with probiotics or placebo, the investigators will be able to see
      whether probiotics can reduce the overall IL-6 and TNF-alpha production in the body and
      increase the production of IL-10. The investigators suspect that IL-6 and TNF-alpha will
      decrease after the start of probiotic treatment, and that it will increase again after ending
      treatment with probiotics, in contrast to IL-10.

      Conclusion The investigators consider it important to clarify whether probiotic therapy has
      clinically relevant effect on disability and pain in patients with type 1 Modic changes, and
      whether this will result in detectable changes in inflammation markers and modifications to
      Modic changes over time. A positive result may open up for an alternative effective, low-risk
      and low-cost treatment.

      Selection of the probiotic The probiotic product Dicoflor ® (Pharma Force Aps) is used, as it
      contains Lactobacillus rhamnosus GG, the most commonly used bacterial strain in clinical
      trials. Each capsule contains 6 billion lactic acid bacteriae. The recommended dose is 1
      capsule twice daily. The effect of this dietary supplement has been studied in patients with
      rheumatoid arthritis [32] and demonstrated as an effect on TNF-α and IL-8 [27-29]. The
      bacterial strain has been used for children with atopic dermatitis, with a demonstrated
      effect on IL-10 [30]. Furthermore, the effect on the immune system has been studied in
      healthy adults [31].

      Methods Design

      Randomized double-blind clinically controlled study with 3, 6 and 12 month follow-up and 2
      arms:

        1. Group 1: Probiotic Dicoflor ® twice daily for 100 days

        2. Group 2: Placebo twice daily for 100 days

      Randomization Web-based automated bloc randomization was established by the Data Manager
      Jakob Hjort and created in the database RedCap, belonging to the Department of Clinical
      Medicine, Aarhus University Department. Only one person, project assistant PhD Nanna Rolving,
      Diagnostic Center, Regional Hospital Silkeborg, knows the randomization code.

      Location Spine Center (The Research Unit), Diagnostic Center, Regional Hospital Silkeborg.

      Ole Kudsk Jensen, MD PhD is sponsor-investigator. A junior doctor (MHA) is in charge of the
      practical implementation of the project, which is planned as part of a PhD.

      Setting Study participants are recruited among the patients referred to the Spine Center,
      Silkeborg Regional Hospital, comprising the Surgical Unit (K-RYG), the Medical Unit (M-RYG)
      and the Research Unit (F-RYG). After having received the usual intervention in the Spine
      Center (surgical intervention not indicated), the patients are informed about the study and
      given written information with a telephone number allowing them to contact the Research Unit,
      if they are interested in participating in the study. Most participants are recruited from
      the Medical Unit taking care of the vast majority of the patients of the Spine Center.

      Usually, an MRI of the lumbar spine is available when a referral from a general practitioner
      is received. If MRI is not available, it usually will be ordered by a physician at the Spine
      Center to clarify the condition in relating to clinical findings.

      The usual interventions of M-RYG and F-RYG are very similar. The patients complete a
      questionnaire. A physician, chiropractor or physiotherapist, who subsequently conduct a
      clinical back examination, take a medical history. The clinical issues and MR images are
      discussed between physician, chiropractor and physiotherapist. If there is a need for further
      tests or imaging, this is ordered. In M-RYG and F-RYG patients receive general information
      about back pain, including both the general poor correlation between imaging and pain, the
      importance of exercising, general exercise or training, and finally that psychological
      factors can have an impact on back pain. Considerations are made whether medical pain
      treatment needs adjustment, and whether assessment by a surgeon should be considered.

      The MRI is assessed by the examining physician and discussed with an affiliated physician
      from the Department of Radiology at the Regional Hospital in Silkeborg [32].

      When the patient has received the usual intervention in M-RYG, F-RYG or in K-RYG, and Modic
      type 1 or mixed Modic changes have been identified on MRI of the lumbar spine, the patient is
      told that this structural change may be a contributing factor to pain and may cause the pain
      and disability to be prolonged. The patient is then informed about the present Modic project
      and offered an opportunity to participate. If the patient expresses interest in participating
      they are given written information on the study. The information includes the phone number of
      the secretary at F-Ryg. The patient is advised to contact if the secretary after reading the
      information if still interested.

      Baseline When the patient phones the secretary of F-RYG, a visit at F-RYG is planned to
      finally decide whether in- and exclusion criteriae are fulfilled. When meeting at F-RYG, the
      participant-information is discussed. If the patient is still interested and there are no
      exclusion criteriae, a medical record and a clinical back examination are performed.
      Subsequently, a blood sample is taken. Afterwards, the patient is examined and guided by the
      physiotherapist regarding plan for physical activity. If lab tests are normal and there are
      no exclusion criteria, and all inclusion criteria are met, a consent form is signed, and the
      participant is included in the study.

      The physician ensures that the participant is given proper information in regard to back pain
      in general and specifically in relation to the patient's situation. The medical pain
      management is adjusted if necessary.

      Level of function is recorded (self-assessed walking distance, maximum time sitting down,
      nocturnal pain). The mobility of the spine is measured (modified Schober, side bending,
      bending backwards), and it is registered whether there are signs of nerve root compression.

      The patient is informed about the possibility of an assessment by a surgeon during the study
      period , if there is any worsening or no improvement of the condition. Indications for
      referral to a surgeon adheres to guidelines.

      If the patient is on sick leave, the person is advised to resume work when possible. No case
      manager is assigned.

      The physiotherapist registers self-rated loss of functioning in percent, and evaluates the
      pain response during testing in order to ensure that the patient is appropriately informed
      about specific exercises, exercise in general and "pacing" principles.

      A follow-up appointment with the physiotherapist is arranged after 14 days. Clinical data are
      recorded in schedules.

      Dispensing of capsules with dietary supplements / placebo After randomization, the capsules
      are handed out to the participant in blister packs, and compliance is recorded in a diary.
      The participants are advised to take the capsules at 08 and 18 at meals, and are recommended
      to save emptied blister packs. The capsules are recommended to be stored in a refrigerator.
      They can also be stored at room temperature. The capsules are designed so that placebo
      capsules are indistinguishable from active capsules.

      The participant is advised against the use of other preparations containing other lactic acid
      bacteria, for example Paraghurt or Idoform.

      Baseline data in addition to clinical findings Questionnaire data: Before clinical
      examination by the doctor and physiotherapist a comprehensive questionnaire is completed
      including questions of back pain and leg pain during the preceding 14 days [33], limitations
      of function at the examination day [34], possibly previous surgery for herniated disc, fear
      avoidance, work, possibly sick leave and duration, questions about perceived cause of the
      pain, questions about exercise during leisure time, type of housing, psychological symptoms,
      tobacco and alcohol consumption and the use of pain medication. How these questions are
      answered, have previously been shown to be important for prognosis [35, 36].

      Follow-up Generally: If symptoms of nerve root irritation occur during the study, the
      participant may contact the Research Unit for an additional clinical evaluation.

      After 14 days: The physiotherapist makes adjustments to the exercise program. In addition,
      blood samples are taken.

      After 102 Days: The participant meets with project nurse and returns the emptied blister
      packs, complete a questionnaire (pain, function, possibly other treatment), and blood samples
      are taken.

      6 months after initiation of the treatment the project nurse records the level of pain and
      function by phone or mail.

      12 months after initiation of the treatment the participant attends for a new consultation
      including a questionnaire, blood tests and a new standardized clinical assessment. A new MRI
      scan is ordered of the lumbar spine to assess the extent to which the previously diagnosed
      Modic type 1 change is unchanged or has changed.

      After the project is ended, the MRI changes will be described standardized [38] at baseline
      and 1 year without knowledge of clinical information and intervention group (blinded
      description).

      Status with regards to sick leave is determined based on the DREAM database [37].

      Blood tests:

      Blood samples are taken before starting treatment, partly as routine tests with regards to
      inclusion, partly as project samples, which are then frozen. Routine tests include: CRP,
      hemoglobin, white blood cells, platelets, creatinine, ALAT, alkaline phosphatase, albumin.

      Blood samples for the biobank: IL-6, IL-1 0 and TNF-alpha and an extra sample for future
      reference and possible additional analyzes.

      Similarly, additional blood samples are taken after 14 days, 102 days and 1 year.

      In total 4 x 7 ml of blood is taken for routine tests and 4 x 6 ml for project samples.
      Project samples are stored in the biobank and destroyed at the end of the full study
      including the research period.

      Registration of possible adverse effects Unwanted side effects or possible side effects are
      recorded as an adverse event in RedCap and reported to the Ethics Committee.

      There is no available product summary, since the product is registered as dietary supplement.
      There are no known side effects when using the product in people with a normally functioning
      immune system. Therefore, any potential side effect will be an unexpected side effect.

      Infections during the study are assessed and treated by the general practiioner as usual. If
      the participant is admitted at hospital for infection, the Research Unit should be contacted
      with regard to evaluating possibly precautions. If there is an infection and bacteraemia with
      intestinal bacteria or lactic acid bacteria, the medication will be discontinued and the
      randomization code broken. The case will be reported to the Ethics Committee. Possible
      causality should be assessed before unblinding.

      Side effects and possible discontinuation of the preparation is recorded in the journal and
      in RedCap, which is used as 'Case Report Form'.

      Data analysis Data are made anonymous, so that each patient can only be identified by a
      serial number.

      Calculation of power Power calculation is based on the findings of the placebo-controlled
      study [16] and on the assumption that treatment with probiotics will be less effective than
      treatment with antibiotics.

      Changing of the median values of function in the intervention group and the control group at
      1 year were 8 and 1, respectively, in the previously mentioned study. It was assumed, that
      the mean values were not different from the median values. The standard deviations were not
      specified in the article [16], only the interquartiles that were comparable with data from a
      previous study made by the investigators [5]. The standard deviation was 6.3 in that study.
      Using a standard deviation of 6.5, a clinically relevant change was estimated to be 5 instead
      of 8.

      Strength calculation was made by STATA [38] (β = 0.8, α = 0.05): Requiring 42 patients in
      each group, to be able to detect a difference of '5' in functioning after 1 year compared to
      '1' in the control group. Assuming a drop-out rate at 10% will result in the need for a group
      size of 47.

      Statistical analysis

      Primary outcome:

      1) The difference between 1-year function and baseline is analyzed by unpaired t-test, if the
      data are normally distributed, and with Wilcoxon's test for unpaired data, if the data are
      not normally distributed.

      Secondary outcome:

        1. Proportion with minimal loss of function is compared with Chi 2 test.

        2. And 3) are analyzed by unpaired t-test or Wilcoxon's test for unpaired data, depending
           on whether the data are normally distributed.

      4) To be analyzed with Wilcoxon's test for unpaired data. 5) Compared by Chi 2 test. 6)
      Difference in number of operated is tested with Fishers exact test, the figures are assumed
      to be small.

      7) Most significant change is the decrease or increase in IL-6 levels respectively after
      starting treatment and after treatment discontinuation, which is tested with paired t-test
      within the groups and unpaired t-test between groups, possibly with a Wilcoxon's test, if the
      data are not normally distributed.

      8) And 9, 10) Compared by Chi 2 test.

      An 'Intention to treat' principle will be used, which means all randomized patients are
      included in the analysis, independent of their compliance with treatment or if operation was
      necessary. In the case of lacking follow-up data, baseline data will be entered (last
      observation carried forward).

      A significance level of 5% will be used.

      Ethical considerations It is considered consistent with good ethical standard to offer
      participation in a randomized trial, which deals with a preparation that is usually well
      tolerated and may have efficacy, and as an alternative to prolonged antibiotic therapy, which
      is used in some places and is not without risk.

      There is good evidence that patients with type 1 Modic changes are at higher risk than other
      back pain patients for persistent pain and disability and even problems with return to work.
      The latter is of special importance, not only for the quality of life but also economically,
      both for the individual patient and for society. It can be estimated that about 20% of
      patients referred to secondary health care have type 1 Modic changes, and it is estimated
      that at least 20,000 patients are referred to the hospitals in Denmark, due to low back pain.
      This may imply that a therapy with clinically relevant effect may be offered to about 4,000
      patients annually in Denmark.

      Review and Approvals Application for approval by the Research Ethics Committee, Central
      Jutland, and the experiment reported to www.ClinicalTrials.gov and the Data Protection
      Agency. The Department of Health has announced that the trial should not be run as drug
      trials, and therefore there is no need for supervision from GCP unit.

      Time schedule Inclusion of the participants has started January 2016, and by now (end of
      March 2017) 91 participants have been included. One-year follow-up of all participants will
      end at April 2018. Data analysis and article writing are planned in 2018-19.
    

Intervention name(s): Probiotic; Inactive capsules
Intervention type(s): Dietary Supplement; Other
Intervention description(s): Lactobacillus rhamonosus GG; Placebo
Allocation: Randomized
Intervention model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary purpose: Treatment