The Sacral Erector Spinae Plane Block in Total Knee Arthroplasty

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

RECRUITING

Total Enrollment

126 participants

Study Classification

OBSERVATIONAL

Study Start Date

2025-07-16

Study Completion Date

2027-12-31

Brief Summary

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The goal of this observational study is to learn about the analgesic efficacy and postoperative recovery of two locoregional anesthesia combinations in patients \> 18 years (ASA I-III), scheduled for unilateral TKA under spinal anesthesia with expected hospitalization \> 24 hours:

* ACB + sacral ESP block
* ACB + iPACK block

The main question it aims to answer is: Does the ACB + sacral ESP block combination produce effective postoperative recovery and analgesic effect?

Participants already taking ACB + sacral ESP block as part of their regular peri-operative care for TKA will be followed in the postoperative period for 48 hours.

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Detailed Description

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Total Knee Arthroplasty (TKA) is a common orthopedic surgery in elderly patients, often requiring effective postoperative pain control to enhance recovery. Conventional locoregional techniques include adductor canal block (ACB) and the iPACK block (infiltration between the Popliteal Artery and Capsule of the Knee). While effective, iPACK may carry infection risks due to its proximity to the surgical field.

The sacral ESP block is a more recent ultrasound-guided technique targeting posterior sacral nerve branches from a remote site, potentially avoiding motor weakness and surgical site complications. Early literature and local clinical experience suggest that combining sacral ESP with ACB may provide comparable analgesia to ACB+iPACK while offering practical and safety advantages.

Study Design:

* Type: Single-center, prospective, observational study
* Setting: Ospedale di Crotone, Italy
* Duration: Maximum of 30 months
* Sample size: 63 patients per group (based on QoR-15 score, with 80% power and α = 0.05)

Population:

* Adults \>18 years (ASA I-III), scheduled for unilateral TKA with expected hospitalization \>24 hours
* Exclusion: refusal of consent, contraindications to spinal or regional anesthesia, coagulation disorders, severe dementia, ongoing infection, or emergency surgeries

Primary Endpoint:

* Quality of Recovery (QoR-15) score at 24 hours post-surgery (score range 0-150; higher scores indicate better recovery)

Secondary Endpoints:

* Postoperative pain scores (NRS, score range 0-10, higher scores indicate more pain) at rest and movement (0-48 hours)
* Time to first mobilization
* Patient satisfaction (Likert scale)
* Analgesic consumption and time to first request
* Incidence of nausea, vomiting, antiemetic use
* Block-related complications or adverse events

Procedure:

All patients receive spinal anesthesia and multimodal postoperative analgesia (paracetamol, rescue tramadol). Regional blocks are performed under ultrasound guidance in aseptic conditions. ESP is performed at the S2 level with 20 mL ropivacaine 0.375%. ACB and iPACK are also administered per standard protocols.

Data Analysis:

Statistical comparisons between groups will be made using appropriate parametric or non-parametric tests based on variable distribution. Repeated measures will be analyzed using linear mixed-effects models.

Ethics:

The study follows Good Clinical Practice (GCP) and the Declaration of Helsinki. Patients provide written informed consent. Privacy and data confidentiality are ensured.

Conditions

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Total Knee Anthroplasty Regional Anesthesia

Study Design

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Observational Model Type

CASE_CONTROL

Study Time Perspective

PROSPECTIVE

Study Groups

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ACB/iPACK

combination of adductor canal block (saphenous) and infiltration between the Popliteal Artery and Capsule of the Knee (iPACK) block

Local Anesthetic Injection

Intervention Type PROCEDURE

combination of regional blocks for TKA postoperative analgesia

ACB/sacral ESP

combination of adductor canal block (saphenous) and sacral erector spinae plane (ESP) block

Local Anesthetic Injection

Intervention Type PROCEDURE

combination of regional blocks for TKA postoperative analgesia

Interventions

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Local Anesthetic Injection

combination of regional blocks for TKA postoperative analgesia

Intervention Type PROCEDURE

Eligibility Criteria

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Inclusion Criteria

* Adults \>18 years
* ASA I-III
* scheduled for unilateral TKA with expected hospitalization \> 24 hours

Exclusion Criteria

* Refusal of consent
* Local anesthetics allergies
* contraindications to spinal or regional anesthesia
* coagulation disorders
* anticoagulation/antiaggregation medications
* dementia
* ASA-PS \> III
* ongoing infection
* emergency surgeries

Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No