Tourniquet on Total Knee Arthroplasty

Not Applicable

Completed

Conditions: Arthritis Knee

Interventions: Device: No tourniquet
Device: tourniquet

Registration Number: NCT04923724

Lead Sponsor: Washington University School of Medicine

Brief Summary: The purpose of this study is determine the effect on novel pressure-regulating tourniquet use on pain, functional recovery, sleep and total blood loss following total knee arthroplasty.

Detailed Description: Functional recovery after total knee arthroplasty (TKA) has seen dramatic improvement over the past 20 years through advances in surgical technique, implant design, perioperative pain management strategies, and physical therapy protocols. Tourniquet use during TKA, however, remains controversial due to conflicting reports in the literature on these benefits and risks of its use. Reported advantages of tourniquet use include improved visualization of the surgical field and decreased intraoperative blood loss. Reported disadvantages of tourniquet use include increased postoperative pain and slower functional recovery as a direct result of the pressure of the tourniquet on the thigh during the procedure.

Traditionally with tourniquet use during TKA, the limb is exsanguinated and the tourniquet is raised to a fixed, pressure at the beginning of the case, typically 250mmHg to 350mmHg, and let down after closure. A novel tourniquet design that adjusts the tourniquet pressure in real-time based on intraoperative patient blood pressure measurements. This design may allow for the tourniquet to be inflated at a lower mean pressure while still maintaining efficacy.

A prospective study comparing total blood loss, pain and functional recovery after TKA using this novel tourniquet design, design (Zimmer A.T.S.® 4000TS Automatic Tourniquet System, with disposable contour cuffs) and TKA without tourniquet would further the current literature. Total blood loss will be calculated by previously validated methods. Pain and functional recovery will be closely monitored throughout the postoperative period using a patient wearable activity tracker (FitBit Inspire HR) and a smartphone-based patient engagement platform with integrated digital surveys paired with smart-brace based home PT assessments (FocusMotion).Pain and functional recovery will be closely monitored throughout the postoperative period using a patient wearable activity tracker (FitBit Inspire HR) and a smartphone-based patient engagement platform with integrated digital surveys paired with smart-brace based home PT assessments (FocusMotion). Applying this technology to the proposed study can help identify problematic pain that is not appreciable during admission; given the fact that markers of inflammation and myocyte damage increase over time until at least post-operative day 3, it is possible that TKAs performed under tourniquet may have pain and narcotic requirements not appreciated with short-stay admissions . The proposed study will further the literature on pain and narcotic use in the early time period after TKA, and will help identify if tourniquet has an effect on these variables.

Furthermore, sleep quality is a component of functional recovery and is correlated with pain. Knee osteoarthritis affects general quality of life by increasing sleep disturbance and nighttime wakening, and this is correlated with the pre-operative radiographic severity of disease. Sleep quality is affected in the immediate post-operative period after TKA as well, but improves by 3-6 months post-operatively . The proposed study would be the largest prospective study investigating the effect of TKA on pain and sleep quality, as well as being the first to investigate tourniquet use as a factor affecting sleep quality and pain. The proposed study would be the first to collect both subjective and objective data on the subject, using validated survey measurements as well as the data collected by the Fitbit Inspire HR device.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 165

Inclusion Criteria

Age 18 and up
Primary unilateral TKA
BMI<45
Primary diagnosis of osteoarthritis
Patient has a iOS or Android smartphone capable of running FitBit and FocusMotion applications

Exclusion Criteria

Revision TKA
Bilateral TKA
Pregnancy
Prisoners
Pre-existing functionally-limiting neurologic disorder
Narcotic dependence, defined as oxycodone/hydrocodone use >5days/week
History of unprovoked VTE/PE
Inability to complete baseline functional testing

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
No Tourniquet during surgery	No tourniquet	Patients in this group do not get a tourniquet during surgery.
Tourniquet during surgery	tourniquet	Patients in this group get a tourniquet during surgery.

Primary Outcome Measures

Name	Time	Method
Pain After TKA Measured by VAS Pain Survey on Focusmotion App	1 year	Effect of tourniquet use on pain after TKA, 0-10 scale with 10 being higher pain, VAS pain survey

Secondary Outcome Measures

Name	Time	Method
Functional Recovery Measured by Oxford Knee Score Scale	1 year	Effect of tourniquet use on functional recovery after TKA. Score each question (item) from 0 to 4 with 0 being the worst outcome and 4 being the best outcome. The scores are then summed to produce an overall score running from 0 (worst possible) to 48 (best outcome).
Functional Recovery Measured by Forgotten Joint Score	1 year	Effect of tourniquet use on functional recovery after TKA. Scale measures how much patient is aware of their joint after surgery. a total of 12 questions are answered asking about awareness of the knee joint. Every question is scored 1 (never) to 5 (mostly) according to the selected response categories. Thus, the raw score ranges from 12 to 60. The raw score is linearly transformed to a 0-100 scale and then reversed to obtain the final score. Final score = 100 - ((sum(item01 to item12) - 12)/48\*100) 0:Represents the worst possible score, indicating the highest level of joint awareness and the least ability to forget. 100:Represents the best possible score, indicating the lowest level of joint awareness and the greatest ability to forget
Functional Recovery Measured by Normal Knee Survey	1 year	Effect of tourniquet use on functional recovery after TKA measured by a score of 0-100, 100 being knee feels normal, 0 means knee does not feel normal