The Effects of Extracorporeal Shock Wave Therapy in Patients With Coccydynia: A Randomized Controlled Trial

Study Overview
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Brief Summary
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The purpose of this study is to evaluate the effects of extracorporeal shock wave therapy (ESWT) on the outcomes of coccydynia.

Detailed Description
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Coccydynia is pain in the coccygeal region, and usually treated conservatively. Extracorporeal shock wave therapy (ESWT) was incorporated as non-invasive treatment of many musculoskeletal conditions. However, the effects of ESWT on coccydynia are less discussed. The purpose of this study is to evaluate the effects of ESWT on the outcomes of coccydynia. Patients were allocated to ESWT (n=20) or physical modality (SIT) group (n=21) randomly, and received total treatment duration of 4 weeks. The visual analog scale (VAS), Oswestry disability index (ODI), and self-reported satisfaction score were used to assess treatment effects. The VAS and ODI scores were significantly decreased after treatment in both groups, and the decrease in the VAS score was significantly greater in the ESWT group. The mean proportional changes in the ODI scores were greater in the ESWT group than in the SIT group, but the between-group difference was not statistically significant. The patients in the ESWT group had significantly higher subjective satisfaction scores than SIT group. The investigators concluded that ESWT is more effective and satisfactory in improving discomfort and disability caused by coccydynia than the use of physical modalities. Thus, ESWT is recommended as an optimal treatment option for patients with coccydynia.

Official Title
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The Effects of Extracorporeal Shock Wave Therapy in Patients With Coccydynia: A Randomized Controlled Trial

Conditions
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Coccydynia

Intervention / Treatment
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* Device: Extracorporeal shock wave therapy (ESWT)
* Device: SWD combined IFC


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: First-time diagnosed with coccydynia History of direct traumatic events to the buttocks, such as falls or slipping Exclusion Criteria: Tumors of the cauda equina Pelvic surgery Herniation of the lumbosacral disc Internal procidentia Genitourinary or gastrointestinal complaints Psychogenic factors

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 83 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: ESWT group<br>The patients were randomly assigned to the extracorporeal shock wave therapy (ESWT) group. | Device: Extracorporeal shock wave therapy (ESWT)<br>* The patients received 2000 shots of extracorporeal shock wave therapy in the coccyx area per session for four sessions (one session a week for 4 consecutive weeks). The frequency used was 5 Hz and the pressure was 3-4 bar.<br>|
| Active Comparator: SWD combined IFC group<br>The patients were randomly assigned to the SIT group. The patients received combined therapy with shortwave diathermy (SWD) and interferential current (IFC) performed by the same physiotherapist at each treatment session. | Device: SWD combined IFC<br>* The shortwave diathermy (SWD) was the inductive mode with a coil at a frequency of approximately 27.12 MHz. The shortwave diathermy applicator was placed over the sacrococcygeal area. The treatment duration was 20 minutes. After completing the SWD treatments, the patients received the interferential current (IFC) treatment. IFC provides deeper electrical stimulation. The electrical current was applied to the gluteal area using four electrodes from 2 channels of the stimulator. The four electrodes were set on the gluteal area. The carrier frequency, typically 4000 Hz and 4100 Hz and designed to interfere with each other, resulted in a beat frequency of 100 Hz within the treated area. The treatment duration was 20 minutes. The protocol was set as 3 times per week for a period of 4 weeks.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change from pre-enrollment in Visual analog scale (VAS) at 5th and 8th week after first intervention | a scale from 0 through 100 (0 for no pain and 100 for the worst pain) | pre-enrollment, 5th and 8th week after first intervention | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change from pre-enrollment in The Oswestry disability index (ODI, in Chinese) at 5th and 8th week after first intervention | There are six statements to be ranked on a scale of 0 to 5 in each of the 10 sections of the questionnaire. The contents relate to impairments such as pain intensity and abilities in personal care, lifting, walking, sitting, standing, sleeping, sex life, social life and traveling. The patients were asked to identify the corresponding level of disability in each section. The total score ranges from 0 to 50; 0 represents the highest level of function, and 50 indicates completely disabled. | pre-enrollment, 5th and 8th week after first intervention | 
| Change from pre-enrollment in Self-reported satisfaction scales at 8th week after first intervention | A 5-level scale was used for evaluation at the 8th week after treatment. The excellent and good scores were categorized into one group, and the acceptable and poor scores were categorized into another group for comparison. | 8th week after first intervention | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Coccydynia, Extracorporeal shock wave therapy, Disability