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Blood Flow Restriction Training (BFR) in an Adolescent Population

Primary Purpose

Blood Flow Restriction, ACL Tear, ACL Injury

Status
Active
Phase
Not Applicable
Locations
United States
Study Type
Interventional
Intervention
Blood Flow Restriction using Delfi Personalized Tourniquet System
Sponsored by
Connecticut Children's Medical Center
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional treatment trial for Blood Flow Restriction focused on measuring physical therapy, rehabilitation

Eligibility Criteria

12 Years - 18 Years (Child, Adult)All SexesDoes not accept healthy volunteers

Inclusion Criteria:

  • Patients between the age of 12 and 18 years at the time of surgery.
  • Post-primary ACL reconstruction
  • Orthopaedic surgical intervention (including all additional procedures at the knee) completed by one of the Elite Sports Medicine physicians.
  • Patient completed postoperative rehabilitation following standard protocols
  • No contraindications to performing BFR, as outlined in the Owens Recovery[18] Science 2018 Personal Blood Flow Restriction manual.

Exclusion Criteria:

  • Patients older than 18 and younger than 12 at the time of surgery
  • Any additional diagnoses or deformity not related to knee injury that could affect knee strength
  • Additional lower extremity injury at time of knee injury (e.g., ankle injury) requiring treatment
  • Previous surgical intervention on the knee (ipsilateral and contralateral)
  • Patients with weight bearing restrictions for greater than two weeks after surgery due to concomitant pathology such as meniscal root/radial repair, chondral pathology, or multi-ligament pathology. . Generic exclusion: "Subjects not meeting all inclusion criteria."

Sites / Locations

  • Connecticut Children's Sports Physical Therapy

Arms of the Study

Arm 1

Arm 2

Arm Type

Experimental

No Intervention

Arm Label

BFR Exercise Group

Non-BFR exercise group

Arm Description

In addition to the standard ACL protocol, patients in this study will utilize the Owen Recovery Science exercise protocol for BFR [18]. The following guidelines will be followed concerning exercise progression, occlusion pressure and difficulties with volume achievement. A total of 20 youth and adolescent patients undergoing a surgical procedure for ACL reconstruction at Connecticut Children's Elite Sports Medicine and completing physical therapy at Connecticut Children's Sports Physical Therapy will be recruited for this study.

As part of this pilot study, the investigators will additionally collect prospective controls. This population will be patients not participating in physical therapy at Connecticut Children's but underwent ACL reconstruction by Elite Sports Medicine

Outcomes

Primary Outcome Measures

Isometric Quad strength Peak Torque
Isometric strength testing to measure peak torque quadriceps strength (unit: ft-lbs) as reported by isokinetic dynamometer on involved and uninvolved limb.
Isometric Quad Strength limb symmetry index
Quadriceps limb symmetry index is calculated by taking the values from outcome 1. [ ( peak torque quadriceps involved limb (ft/lbs)/ peak torque quadriceps uninvolved limb (ft-lbs))*100] as reported by isokinetic dynamometer. This value is expressed as a percentage. 100% would equal perfect symmetry.
Isometric hamstring Strength Peak Torque
Isometric strength testing to measure peak torque hamstsring strength (unit: ft-lbs) as reported by isokinetic dynamometer on involved and uninvolved limb.
Isometric Hamstring Strength Limb Symmetry Index
Hamstring limb symmetry index is calculated by taking the values from outcome 3 [ ( peak torque hamstring involved limb (ft/lbs) / peak torque hamstring uninvolved limb (ft-lbs))*100] as reported by isokinetic dynamometer. This value is expressed as a percentage.100% would equal perfect symmetry.
Isometric Hip Extension Strength Peak Torque
Isometric strength testing to measure peak torque hip extension in foot pounds as reported by isokinetic dynamometer
Isometric hip extension Strength Limb Symmetry Index
Hip Extension limb symmetry index is calculated by taking the values from outcome 5 [ ( peak torque hip extension involved limb peak torque (ft/lbs) /hip extension uninvolved limb peak torque (ft-lbs))*100] as reported by isokinetic dynamometer. This value is expressed as a percentage.100% would equal perfect symmetry.
Anterior step down test
Anterior step down test measured in number of repetitions comparing involved to uninvolved lower extremity
Y balance test
Y balance test measuring distance of excursion in cm compared comparing involved to uninvolved lower extremity
Lower Extremity Strength
Single leg Bridge test measured in number of repetitions side to side
Single Leg Hop Test Distance
Single Leg Hop Test measured in cm for involved and uninvolved limb.
Single Leg Hop Test Distance Symmetry
Single Leg Hop Test measured in cm for involved and uninvolved limbs. Limb symmetry index is calculated by using the distance for involved and uninvolved [ ( involved limb distance / uninvolved limb distance)*100]. this value is expressed as a percentage. 100% would equal perfect symmetry.
6 meter timed single leg hop
Timed 6 meter single leg hop for involved and uninvolved limb measured in seconds.
6meter timed hop symmetry
Timed 6m single leg hop calculating limb symmetry index [ ( involved limb single leg hop time/ uninvolved single leg hop time)*100]. This value is expressed as a percentage. 100% would equal perfect symmetry.
Single Leg Triple hop for distance
Triple Hop Test measured in cm for involved and uninvolved limb,
Single Leg Triple Hop Symmetry
Single Leg Triple hop calculating limb symmetry index [ ( involved limb triple hop distance/ uninvolved triple hop distance)*100]. This value is expressed as a percentage. 100% would equal perfect symmetry.
Single Leg Crossover hop for distance
Single leg Crossover hop Test measured in cm for involved and uninvolved limb.
Single Leg Crossover Hop Symmetry
Single Leg Crossover Hop calculating limb symmetry index [ ( involved limb crossover hop distance/ crossover triple hop distance)*100]. This value is expressed as a percentage. 100% would equal perfect symmetry.

Secondary Outcome Measures

Quad Hypertrophy
Thigh Circumference measured at location 10cm superior to patella and measured in cm comparing involved to uninvolved lower extremity
Pedi-IKDC (International Knee Documentation Committee)
Patient Reported Outcome Measure- Scores range from 0 points (lowest level of function or highest level of symptoms) to 100 points (highest level of function and lowest level of symptoms).
KOOS (Knee Outcomes and Osteoarthritis Scale)
Patient Reported Outcome Measure- The score is a percentage score from 0 to 100, with 0 representing extreme problems and 100 representing no problems. This scoring direction, 100 indicating no problems
ACL- RSI (Anterior Cruciate Ligament- Return to Sport after Injury)
Patient Reported Outcome Measure- ACL-RSI scores range from 0 to 100, with higher scores representing patients who are more ready to return to sport
Marx Activity Rating Scale
Patient Reported Outcome Measure- This determines a patient's activity level as it pertains to running, cutting, deceleration and pivoting. A higher score indicates a higher activity level (0-16 max)

Full Information

First Posted
February 20, 2020
Last Updated
February 14, 2023
Sponsor
Connecticut Children's Medical Center
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1. Study Identification

Unique Protocol Identification Number
NCT04285879
Brief Title
Blood Flow Restriction Training (BFR) in an Adolescent Population
Official Title
A Determination of Efficacy and Therapeutic Benefits of Blood Flow Restriction Training in an Adolescent Population
Study Type
Interventional

2. Study Status

Record Verification Date
February 2023
Overall Recruitment Status
Active, not recruiting
Study Start Date
January 15, 2020 (Actual)
Primary Completion Date
January 15, 2024 (Anticipated)
Study Completion Date
February 1, 2024 (Anticipated)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Principal Investigator
Name of the Sponsor
Connecticut Children's Medical Center

4. Oversight

Studies a U.S. FDA-regulated Drug Product
No
Studies a U.S. FDA-regulated Device Product
Yes
Product Manufactured in and Exported from the U.S.
No
Data Monitoring Committee
No

5. Study Description

Brief Summary
While there are a number studies that have reported on the use of BFR in the adult population, there is limited information about the use of BFR in the adolescent population. This study aims to evaluate the use of BFR training in conjunction with traditional ACL (anterior cruciate ligament) reconstruction rehabilitation in adolescents. The purpose of this study is to evaluate the addition of BFR-based exercise to traditional methods of physical therapy. Does the use of BFR-based exercise improve strength, hypertrophy, functional and patient reported outcomes after ACL Reconstruction in the adolescent population?
Detailed Description
The planned pilot study is a prospective case control study utilizing retrospective controls. The investigators will compare the use of exercises augmented with BFR with quantitative measurements of strength and patient reported outcomes. A total of 20 youth and adolescent patients undergoing a surgical procedure for ACL reconstruction at Connecticut Children's Elite Sports Medicine and completing physical therapy at Connecticut Children's Sports Physical Therapy will be recruited for this study. A review of data from 20 previous patients, matched for age, sex, BMI and surgical procedure that completed physical therapy at Connecticut Children's Sports Physical Therapy will be used as a comparison. As part of this pilot study, the investigators will additionally collect prospective controls. This population will be patients not participating in physical therapy at Connecticut Children's, but underwent ACL reconstruction by Elite Sports Medicine. The investigators are unsure of the ability for us to collect prospective controls in a timely manner, hence the investigators will use the above described retrospective cohort as controls if the prospective controls prove difficult to recruit. Identification and Recruitment: All potential patients undergoing ACL reconstruction at Elite Sports Medicine will be approached for participation for this study. Eligible patients will be identified at their initial pre-operative appointment with the Sports Medicine Physician, Athletic Trainer, and Sports Physical Therapy Physical Therapist. Subject selection will be completed by those patients meeting the above outlined inclusion and exclusion criteria. At this time, the study purpose and protocol will be explained and a brief summary of the study will be provided. Consent: Consent will take place at the pre-operative visit. The patient/parent will be given a detailed description of the purpose and methodology for this study. The participants will have the opportunity to read the consent forms and ask any questions they may have about the research. If the patients agree to participate, they will be asked to sign the consent form and a copy will be provided. Retention: Eligible patients will be required to be seen for a minimum of 90% of patient visits to be included in this study. In addition to the standard ACL protocol, patients in this study will utilize the Owen Recovery Science exercise protocol for BFR [18]. The following guidelines will be followed concerning exercise progression, occlusion pressure and difficulties with volume achievement. To determine the appropriate resistance for each exercise, the patient's 1 repetition maximum (1RM) will be attained using a repetition test [19]. This test will use a previously validated algorithm to determine the 1RM based on the weight used to perform a 7-10 repetition test [20]. Patient will perform the exercise with a weight they can comfortably lift for several repetitions. Based on the weight or resistance used, and the patient's perceived exertion a 1RM will be estimated using the modified OMNI-RES (OMNI perceived exertion scale for resistance). The starting load for each exercise will be 20-30% of their 1RM , or bodyweight resistance will be used when loading is not feasible. Proposed Protocol Phase 1- Weeks 1 to 2 Quad Set: 10 second on, 10 second rest at 100% occlusion x10' o progress to isometrics at the edge of the table 60 degrees as clinically appropriate Side Lying Hip Abduction, 30/15/15/15, at 80% occlusion Hip Extension from prone 30/15/15/15, at 80% occlusion Re-check load at the start of each Phase, to determine 1 RM (7-10 RM (repetition maximum) test on leg press) Total BFR time approximately 24 minutes per session, with 2 sessions per week Phase 2- Weeks 3 to 4 Replace Quad Set with Long Arc Quad (90-30deg), 30/15/15/15 at 80% occlusion Replace Hip Extension with Leg Press (shuttle), 30/15/15/15 at 80% occlusion Hip Abduction, 30/15/15/15 at 80% occlusion Total BFR time approximately 24 minutes per session with 2 sessions per week Phase 3- Weeks 5 to 6 Long Arc Quad (90-30deg), 30/15/15/15 at 80% occlusion Leg Press (shuttle), 30/15/15/15 at 80% occlusion Replace Hip Abduction with Bilateral Hip Bridge, 30/15/15/15 at 80% occlusion Total BFR time approximately 24 minutes per session, with 2 sessions per week Phase 4- Weeks 7 to 8 Leg Press (shuttle), 30/15/15/15 at 80% occlusion Replace Long Arc Quad with Step Up 30/15/15/15 at 80% occlusion Bilateral Hip Bridge, 30/15/15/15 at 80% occlusion Total BFR time approximately 24 minutes per session, with 2 sessions per week Phase 5- Weeks 9 to 12 Replace Bilateral Hip Bridge with Medial Step Down, 30/15/15/15 at 80% occlusion Replace Step up with Split Squat, 30/15/15/15 at 80% occlusion Leg Press (shuttle), 30/15/15/15 at 80% occlusion Total BFR time approximately 24 minutes per session, with 2 sessions per week Phase 6- Weeks 11 to 12 Progressively load exercises from phase 5 Total BFR time approximately 24 minutes per session, with 2 sessions per week

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Blood Flow Restriction, ACL Tear, ACL Injury
Keywords
physical therapy, rehabilitation

7. Study Design

Primary Purpose
Treatment
Study Phase
Not Applicable
Interventional Study Model
Parallel Assignment
Model Description
The investigators will compare the use of exercises augmented with BFR with quantitative measurements of strength and patient reported outcomes. A total of 20 youth and adolescent patients undergoing a surgical procedure for ACL reconstruction at Connecticut Children's Elite Sports Medicine and completing physical therapy at Connecticut Children's Sports Physical Therapy will be recruited for this study. A review of data from 20 previous patients, matched for age, sex, BMI and surgical procedure that completed physical therapy at Connecticut Children's Sports Physical Therapy will be used as a comparison. As part of this pilot study, the investigators will additionally collect prospective controls. This population will be patients not participating in physical therapy at Connecticut Children's but underwent ACL reconstruction by Elite Sports Medicine.
Masking
None (Open Label)
Allocation
Non-Randomized
Enrollment
49 (Actual)

8. Arms, Groups, and Interventions

Arm Title
BFR Exercise Group
Arm Type
Experimental
Arm Description
In addition to the standard ACL protocol, patients in this study will utilize the Owen Recovery Science exercise protocol for BFR [18]. The following guidelines will be followed concerning exercise progression, occlusion pressure and difficulties with volume achievement. A total of 20 youth and adolescent patients undergoing a surgical procedure for ACL reconstruction at Connecticut Children's Elite Sports Medicine and completing physical therapy at Connecticut Children's Sports Physical Therapy will be recruited for this study.
Arm Title
Non-BFR exercise group
Arm Type
No Intervention
Arm Description
As part of this pilot study, the investigators will additionally collect prospective controls. This population will be patients not participating in physical therapy at Connecticut Children's but underwent ACL reconstruction by Elite Sports Medicine
Intervention Type
Device
Intervention Name(s)
Blood Flow Restriction using Delfi Personalized Tourniquet System
Other Intervention Name(s)
FDA Establishment Registration Number 9681444. Device Listing Number E127474. Classification Number 878.5910. Product Code KCY. 510(k) Exempt. MID: XCDELMED1099VAN
Intervention Description
The Delfi Tourniquet System is designed to be used in conjunction with exercise. The system automatically determines the degree of occlusion and allows for safe regulation of pressure. Patients will then complete exercises with the use of this device following the Owens Recovery Science Protocol
Primary Outcome Measure Information:
Title
Isometric Quad strength Peak Torque
Description
Isometric strength testing to measure peak torque quadriceps strength (unit: ft-lbs) as reported by isokinetic dynamometer on involved and uninvolved limb.
Time Frame
Change in strength at Pre-op, 3months post-op, 6-9 months post-op
Title
Isometric Quad Strength limb symmetry index
Description
Quadriceps limb symmetry index is calculated by taking the values from outcome 1. [ ( peak torque quadriceps involved limb (ft/lbs)/ peak torque quadriceps uninvolved limb (ft-lbs))*100] as reported by isokinetic dynamometer. This value is expressed as a percentage. 100% would equal perfect symmetry.
Time Frame
Change in strength at Pre-op, 3months post-op, 6-9 months post-op
Title
Isometric hamstring Strength Peak Torque
Description
Isometric strength testing to measure peak torque hamstsring strength (unit: ft-lbs) as reported by isokinetic dynamometer on involved and uninvolved limb.
Time Frame
Change in strength at Pre-op, 3months post-op, 6-9 months post-op
Title
Isometric Hamstring Strength Limb Symmetry Index
Description
Hamstring limb symmetry index is calculated by taking the values from outcome 3 [ ( peak torque hamstring involved limb (ft/lbs) / peak torque hamstring uninvolved limb (ft-lbs))*100] as reported by isokinetic dynamometer. This value is expressed as a percentage.100% would equal perfect symmetry.
Time Frame
Change in strength at Pre-op, 3months post-op, 6-9 months post-op
Title
Isometric Hip Extension Strength Peak Torque
Description
Isometric strength testing to measure peak torque hip extension in foot pounds as reported by isokinetic dynamometer
Time Frame
Change in strength at Pre-op, 3months post-op, 6-9 months post-op
Title
Isometric hip extension Strength Limb Symmetry Index
Description
Hip Extension limb symmetry index is calculated by taking the values from outcome 5 [ ( peak torque hip extension involved limb peak torque (ft/lbs) /hip extension uninvolved limb peak torque (ft-lbs))*100] as reported by isokinetic dynamometer. This value is expressed as a percentage.100% would equal perfect symmetry.
Time Frame
Change in strength at Pre-op, 3months post-op, 6-9 months post-op
Title
Anterior step down test
Description
Anterior step down test measured in number of repetitions comparing involved to uninvolved lower extremity
Time Frame
Change in strength from 3months post-op, 6-9 months post-op
Title
Y balance test
Description
Y balance test measuring distance of excursion in cm compared comparing involved to uninvolved lower extremity
Time Frame
Change in strength from 3months post-op, 6-9 months post-op
Title
Lower Extremity Strength
Description
Single leg Bridge test measured in number of repetitions side to side
Time Frame
Change in strength from 3months post-op, 6-9 months post-op
Title
Single Leg Hop Test Distance
Description
Single Leg Hop Test measured in cm for involved and uninvolved limb.
Time Frame
6-9 months post-op
Title
Single Leg Hop Test Distance Symmetry
Description
Single Leg Hop Test measured in cm for involved and uninvolved limbs. Limb symmetry index is calculated by using the distance for involved and uninvolved [ ( involved limb distance / uninvolved limb distance)*100]. this value is expressed as a percentage. 100% would equal perfect symmetry.
Time Frame
6-9 months post-op
Title
6 meter timed single leg hop
Description
Timed 6 meter single leg hop for involved and uninvolved limb measured in seconds.
Time Frame
6-9 months post-op
Title
6meter timed hop symmetry
Description
Timed 6m single leg hop calculating limb symmetry index [ ( involved limb single leg hop time/ uninvolved single leg hop time)*100]. This value is expressed as a percentage. 100% would equal perfect symmetry.
Time Frame
6-9 months post-op
Title
Single Leg Triple hop for distance
Description
Triple Hop Test measured in cm for involved and uninvolved limb,
Time Frame
6-9 months post-op
Title
Single Leg Triple Hop Symmetry
Description
Single Leg Triple hop calculating limb symmetry index [ ( involved limb triple hop distance/ uninvolved triple hop distance)*100]. This value is expressed as a percentage. 100% would equal perfect symmetry.
Time Frame
6-9 months post-op
Title
Single Leg Crossover hop for distance
Description
Single leg Crossover hop Test measured in cm for involved and uninvolved limb.
Time Frame
6-9 months post-op
Title
Single Leg Crossover Hop Symmetry
Description
Single Leg Crossover Hop calculating limb symmetry index [ ( involved limb crossover hop distance/ crossover triple hop distance)*100]. This value is expressed as a percentage. 100% would equal perfect symmetry.
Time Frame
6-9 months post-op
Secondary Outcome Measure Information:
Title
Quad Hypertrophy
Description
Thigh Circumference measured at location 10cm superior to patella and measured in cm comparing involved to uninvolved lower extremity
Time Frame
Tracking change at Pre-op, 3months post-op, 6-9 months post-op
Title
Pedi-IKDC (International Knee Documentation Committee)
Description
Patient Reported Outcome Measure- Scores range from 0 points (lowest level of function or highest level of symptoms) to 100 points (highest level of function and lowest level of symptoms).
Time Frame
And tracking change at Pre-op, 3months post-op, 6-9 months post-op
Title
KOOS (Knee Outcomes and Osteoarthritis Scale)
Description
Patient Reported Outcome Measure- The score is a percentage score from 0 to 100, with 0 representing extreme problems and 100 representing no problems. This scoring direction, 100 indicating no problems
Time Frame
Tracking change at Pre-op, 3months post-op, 6-9 months post-op
Title
ACL- RSI (Anterior Cruciate Ligament- Return to Sport after Injury)
Description
Patient Reported Outcome Measure- ACL-RSI scores range from 0 to 100, with higher scores representing patients who are more ready to return to sport
Time Frame
Tracking change at Pre-op, 3months post-op, 6-9 months post-op
Title
Marx Activity Rating Scale
Description
Patient Reported Outcome Measure- This determines a patient's activity level as it pertains to running, cutting, deceleration and pivoting. A higher score indicates a higher activity level (0-16 max)
Time Frame
Tracking change at Pre-op, 3months post-op, 6-9 months post-op

10. Eligibility

Sex
All
Minimum Age & Unit of Time
12 Years
Maximum Age & Unit of Time
18 Years
Accepts Healthy Volunteers
No
Eligibility Criteria
Inclusion Criteria: Patients between the age of 12 and 18 years at the time of surgery. Post-primary ACL reconstruction Orthopaedic surgical intervention (including all additional procedures at the knee) completed by one of the Elite Sports Medicine physicians. Patient completed postoperative rehabilitation following standard protocols No contraindications to performing BFR, as outlined in the Owens Recovery[18] Science 2018 Personal Blood Flow Restriction manual. Exclusion Criteria: Patients older than 18 and younger than 12 at the time of surgery Any additional diagnoses or deformity not related to knee injury that could affect knee strength Additional lower extremity injury at time of knee injury (e.g., ankle injury) requiring treatment Previous surgical intervention on the knee (ipsilateral and contralateral) Patients with weight bearing restrictions for greater than two weeks after surgery due to concomitant pathology such as meniscal root/radial repair, chondral pathology, or multi-ligament pathology. . Generic exclusion: "Subjects not meeting all inclusion criteria."
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Adam Weaver, PT, DPT
Organizational Affiliation
Physical Therapist
Official's Role
Principal Investigator
Facility Information:
Facility Name
Connecticut Children's Sports Physical Therapy
City
Farmington
State/Province
Connecticut
ZIP/Postal Code
06032
Country
United States

12. IPD Sharing Statement

Plan to Share IPD
No

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Blood Flow Restriction Training (BFR) in an Adolescent Population

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