Skip to content

Werewolf Flow 50 During ACL Reconstruction

Werewolf Flow 50 During ACL Reconstruction: A Randomized Control Trial

Status
Completed
Phases
Unknown
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT04998656
Enrollment
182
Registered
2021-08-10
Start date
2021-07-12
Completion date
2024-11-02
Last updated
2026-09-14

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Anterior Cruciate Ligament Injuries, Anterior Cruciate Ligament Rupture, Anterior Cruciate Ligament Tear, Arthrofibrosis of Knee

Keywords

ACL, Anterior Cruciate Ligament, Arthrofibrosis, Knee

Brief summary

The aim of this study is to compare the outcomes, ease of use, and cost of the Werewolf FLOW50 device to the institutional standard of care which is does not include the use of electrocautery devices during anterior cruciate ligament reconstruction (ACLR) surgery in patients 12-18 years of age using a randomized control trial design. The investigators hypothesize that a lower proportion of participants who undergo ACLR and are randomized to the Werewolf FLOW50 procedure will experience post-operative arthrofibrosis compared to those randomized to standard of care (control group).

Detailed description

The investigators foresee minimal risks to participants. The Werewolf FLOW50 is an FDA approved medical device to be used in the knee joint. he surgeon performing each surgery has used both the Werewolf FLOW50 device (according to FDA-approved indications for use) and no electrocautery device as standard of care during ACL reconstruction surgery. There is minimal risk associated with the subsequent MRI. Participants may experience slight discomfort from the confined space, flashing lights in their eyes, or temporary warmth/reddening of the skin following MRI. Participants will be informed of these risks and discomforts and pregnant participants or those with any metal and/or electronic devices inside their bodies will not receive the MRI. There is the risk of unintended disclosure of protected health information (PHI) to individuals outside the research team. To mitigate this risk, data points are entered into a password-protected, HIPAA compliant REDCap database accessible to only the PIs and study personnel. Children's Colorado affiliated and approved study personal will have access to all study information collected at all involved study sites. However, other study sites will only have access to the information collected on patients enrolled at their site. We believe this system will contribute to the protection of PHI. The only PHI collected will be visit dates; all participants will be linked to their information via a unique study identifier. The PI will periodically review the status of this protocol. Any unanticipated problems will be disclosed to COMIRB \[Colorado Multiple Institutional Review Board\] within five days with a cover letter detailing the assessment and actions to be taken.

Interventions

DEVICEWerewolf FLOW 50

Use of Werewolf FLOW 50 electrocautery device during surgical treatment for ACL injury. This device is often used as standard of care when our other standard of care approach (use of no electrocautery device) is not used.

OTHERControl

Use of no electrocautery device during surgical treatment for ACL injury. This approach is often used as standard of care when our other standard of care approach (use of Werewolf FLOW 50 electrocautery device) is not used.

Sponsors

University of Colorado, Denver
Lead SponsorOTHER
Smith & Nephew, Inc.
CollaboratorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
SINGLE (Subject)

Masking description

Participants will not be told whether the Werewolf Flow 50 device was used during their surgery or not.

Eligibility

Sex/Gender
ALL
Age
12 Years to 18 Years
Healthy volunteers
No

Inclusion criteria

* Ages 12-18 (inclusive) at time of surgery * Scheduled to undergo ACL reconstruction performed at Children's Hospital Colorado or associated network of care site.

Exclusion criteria

* Underlying congenital or musculoskeletal disorders * Pregnant females, prisoners, and wards of the state * Persons deemed incompetent and those who have limited decision-making capacity

Design outcomes

Primary

MeasureTime frameDescription
Rates of Post-Operative Arthrofibrosis1 year post-operativeNumber of participants with post-operative arthrofibrosis

Secondary

MeasureTime frameDescription
Range of Motion - Knee1 year post-operativeKnee range of motion measured by knee extension and knee flexion, measured in degrees.
Patient-Reported Outcomes Measurement Information System (PROMIS)Data reported below were collected approximately 6-months post-operatively.Based on patient reported outcomes (patient surveys) completed pre-operatively and post-operatively, we will compare levels of pain, functionality, and quality of life between the Werewolf FLOW 50 Group and the Control Group. PROMIS questionnaires are represented as t-scores, where a mean score of 50 with a standard deviation of 10 represents the general population. PROMIS Pediatric Short Form v2.0 - Mobility measures an individual's self-perceived mobility capabilities, such as getting up from a chair or running. Higher numbers indicate better outcomes. PROMIS Pediatric Short Form v2.0 - Pain Interference measures how much pain affects daily physical, mental and social activities. Higher numbers indicate worse outcomes. PROMIS Quality of Life in Neurological Disorders Short Form v1.0 - Lower Extremity Function measures walking, leg mobility and physical tasks for individuals with neurological conditions. Higher numbers indicate better outcomes.
Complications1 year post-operativeNumber of participants with post-operative complications (including arthrofibrosis and injury) between the Werewolf FLOW 50 Group and the Control Group.

Countries

United States

Contacts

PRINCIPAL_INVESTIGATORJay C Albright, MD

Children's Hospital Colorado

Participant flow

Pre-assignment details

This value includes 4 participants that consented and enrolled in the study, but then withdrew before randomization.

Baseline characteristics

Characteristic
Age, Continuous15.4 Years
STANDARD_DEVIATION 1.4
Ethnicity (NIH/OMB)
Hispanic or Latino
19 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
37 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
0 Participants
Race/Ethnicity, Customized
Asian
Asian
1 Participants
Race/Ethnicity, Customized
Asian
Black or African-American
5 Participants
Race/Ethnicity, Customized
Asian
More than one race
7 Participants
Race/Ethnicity, Customized
Asian
Other
8 Participants
Race/Ethnicity, Customized
Asian
Unkown or not reported
5 Participants
Race/Ethnicity, Customized
Asian
White
71 Participants
Sex: Female, Male
Female
47 Participants
Sex: Female, Male
Male
34 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
deaths
Total, all-cause mortality
0 / 560 / 56
other
Total, other adverse events
0 / 560 / 56
serious
Total, serious adverse events
0 / 560 / 56

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Sep 15, 2026