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Knee Positioning After Total Knee Replacement

30 luglio 2026 aggiornato da: Brett Hayden, Icahn School of Medicine at Mount Sinai

The Effects of Postoperative Positioning in Knee Flexion Versus Usual Care After Total Knee Arthroplasty: A Randomized Controlled Trial

Many total knee replacements are performed each year, but there is no clear recommendation regarding knee positioning following this surgery. While the surgical knee is usually positioned in a straight position immediately after surgery, there may be benefits of positioning it in a partially bent position. A trial will compare the outcomes of two groups of patients: a) those whose knees are positioned in a partially bent position for a few hours after surgery and b) those who receive usual care where the knee is most likely positioned in a straight position. The investigators are looking to see whether knee motion and pain differ for patients in the two groups.

Panoramica dello studio

Stato

Non ancora reclutamento

Condizioni

Intervento / Trattamento

Descrizione dettagliata

This parallel two-arm randomized controlled trial will compare outcomes for knee flexion versus usual care in the immediate postoperative period after total knee arthroplasty. Patients who are scheduled for elective primary unilateral total knee arthroplasty will be recruited from an academic health system, screened for inclusion/exclusion criteria, and enrolled. The experimental group will have their surgical knee positioned in approximately 60° of flexion for 2-4 hours after surgery. The control group will receive usual care, where the knee will generally be positioned in extension. Other than the study intervention, both groups will receive standard perioperative, intraoperative, and postoperative care as determined by their treating clinical team. The co-primary endpoints are 6-week knee passive total arc of motion and 7-day maximum pain intensity. Secondary outcomes will be assessed throughout the 12 months after surgery and will include knee motion and pain intensity at other time points; oral opioid consumption; patient-reported questionnaires of knee health, quality of life, and satisfaction; healthcare utilization; and complications. Adverse events will also be monitored for the 12 months after surgery. Outcomes will be assessed via phone or electronic surveys; routine care visits at 2.5 weeks, 6 weeks, 3 months, 6 months, and 12 months after surgery; and chart review.

Tipo di studio

Interventistico

Iscrizione (Stimato)

150

Fase

  • Non applicabile

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Contatto studio

Luoghi di studio

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

  • Adulto
  • Adulto più anziano

Accetta volontari sani

No

Descrizione

Inclusion Criteria:

  • Provision of signed and dated informed consent form
  • Stated willingness to comply with all study procedures and availability for the duration of the study
  • Males and females; Age >18 years
  • Scheduled for elective primary unilateral total knee arthroplasty
  • The planned arthroplasty is secondary to physician-confirmed diagnosis of knee osteoarthritis
  • English- or Spanish-speaking

Exclusion Criteria:

  • Patients with a history of chronic opioid use or chronic pain disorders
  • Patients with a history of bleeding disorders/coagulopathy
  • Patients receiving a total knee replacement secondary to trauma, avascular necrosis, tumor, or Charcot arthropathy
  • Patients scheduled to undergo multiple procedures simultaneously
  • Patients with cognitive impairment or inability to consent independently

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Trattamento
  • Assegnazione: Randomizzato
  • Modello interventistico: Assegnazione parallela
  • Mascheramento: Separare

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Sperimentale: Knee Flexion
Participants in this arm will receive the knee flexion intervention.
Participants will receive knee flexion postoperatively following primary total knee arthroplasty. The surgical knee will positioned at approximately 60° flexion using an abduction pillow as a jig underneath the knee during the immediate postoperative recovery period. Positioning will occur following surgery while the participant is still in the operating room. This is a soft construct and a noninvasive intervention. A goniometer will be used to approximate 60° of flexion as closely as possible. It is expected that the knee will be positioned for 2-4 postoperative hours until a physical therapist comes to mobilize the patient. However, the duration may vary because of the pragmatic context. There is no minimum or maximum positioning time that would make the intervention duration ineligible.
Comparatore attivo: Usual Care
Participants in this arm will receive usual care. No specific attention will be placed to knee positioning in the immediate period after surgery. However, the current usual practice in the health system is that the knee is positioned in extension.
Participants in this arm will receive usual care. No specific attention will be placed to knee positioning in the immediate period after surgery. However, the current usual practice in the health system is that the knee is positioned in extension.

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Knee Passive Total Arc of Motion
Lasso di tempo: At 6 weeks after surgery
Passive total arc of motion will be evaluated through goniometric assessment of maximal passive knee flexion and passive knee extension. Both measures will be recorded, but a single endpoint will be derived by subtracting available extension from available flexion.
At 6 weeks after surgery
Maximum Pain Intensity
Lasso di tempo: At 7 days after surgery
Pain intensity will be evaluated via the patient-reported Numeric Rating Scale (NRS) for pain. The rating is from 0 to 10, with a higher score indicating worse pain. The worst (i.e., maximum) pain intensity will be used.
At 7 days after surgery

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Knee Passive Total Arc of Motion
Lasso di tempo: At 2.5 weeks, 3 months, 6 months, and 12 months after surgery
Passive total arc of motion will be evaluated through goniometric assessment of maximal passive knee flexion and passive knee extension. Both measures will be recorded, but a single endpoint will be derived by subtracting available extension from available flexion.
At 2.5 weeks, 3 months, 6 months, and 12 months after surgery
Maximum Pain Intensity
Lasso di tempo: At 0 days, 1 day, 2 days, 3 days, 10 days, 14 days, 2.5 weeks, 6 weeks, 3 months, 6 months, and 12 months after surgery
Pain intensity will be evaluated via the patient-reported Numeric Rating Scale (NRS) for pain. The rating is from 0 to 10, with a higher score indicating worse pain. The worst (i.e., maximum) pain intensity will be used.
At 0 days, 1 day, 2 days, 3 days, 10 days, 14 days, 2.5 weeks, 6 weeks, 3 months, 6 months, and 12 months after surgery
Total Opioid Consumption
Lasso di tempo: Postoperative days 0 through 14
Consumption of opioids standardized in oral morphine milligram equivalents based on medical records for in-hospital administration, prescriptions, and patient report for at-home consumption. Consumption will be summed across days, with higher numbers indicating greater opioid consumption.
Postoperative days 0 through 14
Knee Injury and Osteoarthritis Outcome Score for Joint Replacement
Lasso di tempo: At 6 weeks, 3 months, 6 months, and 12 months after surgery
The Knee Injury and Osteoarthritis Outcome Score for Joint Replacement (KOOS, JR) is a patient-reported measure of knee health (i.e., pain and function). Scores range from 0 to 100, with higher scores indicating better health.
At 6 weeks, 3 months, 6 months, and 12 months after surgery
Veterans RAND 12-item Health Survey
Lasso di tempo: At 6 weeks, 3 months, 6 months, and 12 months after surgery
The Veterans RAND 12-item Health Survey (VR-12) is a patient-reported measure of global physical and mental health. It provides a physical component summary score and a mental component summary score. These are T-scores with a mean of 50, and higher scores indicate better health.
At 6 weeks, 3 months, 6 months, and 12 months after surgery
Goodman Satisfaction Score
Lasso di tempo: 12 months after surgery
The Goodman Satisfaction Score assesses patient satisfaction with total hip or knee arthroplasty outcomes. Scores range from 0 to 100, with higher scores indicating greater satisfaction.
12 months after surgery
Length of Hospital Stay
Lasso di tempo: Through hospital discharge, average of 1 day, up to 30 days after surgery
Number of days the patient stays in the hospital after the index surgery. This information will be extracted from the medical record.
Through hospital discharge, average of 1 day, up to 30 days after surgery
Percentage of Participants with an Emergency Department Visit
Lasso di tempo: Within 7 days, 30 days, and 90 days after surgery
Percentage of participants with an all-cause emergency department visit after surgery. This information will be extracted from the medical record, with supplementation by participant queries during the postoperative visit after the respective timepoint.
Within 7 days, 30 days, and 90 days after surgery
Percentage of Participants with a Hospital Readmission
Lasso di tempo: Within 30 days and 90 days after surgery
Percentage of participants with an all-cause hospital readmission after surgery. This information will be extracted from the medical record, with supplementation by participant queries during the postoperative visit after the respective timepoint.
Within 30 days and 90 days after surgery
Percentage of Participants with Deep Vein Thrombosis
Lasso di tempo: Within 30 days and 90 days after surgery
Percentage of participants who have deep vein thrombosis after surgery.
Within 30 days and 90 days after surgery
Percentage of Participants with a Pulmonary Embolism
Lasso di tempo: Within 30 days and 90 days after surgery
Percentage of participants who have a pulmonary embolism after surgery. This information will be extracted from the medical record, with supplementation by participant queries during the postoperative visit after the respective timepoint.
Within 30 days and 90 days after surgery
Percentage of Participants with a Venous Thromboembolism
Lasso di tempo: Within 30 days and 90 days after surgery
Percentage of participants who have a venous thromboembolism after surgery. This information will be extracted from the medical record, with supplementation by participant queries during the postoperative visit after the respective timepoint.
Within 30 days and 90 days after surgery
Percentage of Participants with a Coronary Event
Lasso di tempo: Within 30 days and 90 days after surgery
Percentage of participants who have a myocardial infarction or other coronary event after surgery. This information will be extracted from the medical record, with supplementation by participant queries during the postoperative visit after the respective timepoint.
Within 30 days and 90 days after surgery
Percentage of Participants with a Stroke
Lasso di tempo: Within 30 days and 90 days after surgery
Percentage of participants who have a stroke after surgery. This information will be extracted from the medical record, with supplementation by participant queries during the postoperative visit after the respective timepoint.
Within 30 days and 90 days after surgery
Percentage of Participants with a Blood Transfusion
Lasso di tempo: Within 30 days after surgery
Percentage of participants who receive a blood transfusion after surgery. This information will be extracted from the medical record, with supplementation by participant queries during the postoperative visit after the respective timepoint.
Within 30 days after surgery
Percentage of Participants with a Wound Dehiscence
Lasso di tempo: Within 30 days and 90 days after surgery
Percentage of participants who have a wound dehiscence after surgery. This information will be extracted from the medical record, with supplementation by participant queries during the postoperative visit after the respective timepoint.
Within 30 days and 90 days after surgery
Percentage of Participants with a Mechanical Complication
Lasso di tempo: Within 30 days and 90 days after surgery
Percentage of participants who have a mechanical complication after surgery. This information will be extracted from the medical record, with supplementation by participant queries during the postoperative visit after the respective timepoint.
Within 30 days and 90 days after surgery
Percentage of Participants with a Manipulation under Anesthesia
Lasso di tempo: Within 12 months after surgery
Percentage of participants who undergo a manipulation under anesthesia after surgery. This information will be extracted from the medical record, with supplementation by participant queries during the postoperative visit after the respective timepoint.
Within 12 months after surgery
Percentage of Participants with a Knee Revision Surgery
Lasso di tempo: Within 12 months after surgery
Percentage of participants who undergo a knee revision surgery after the index surgery. This information will be extracted from the medical record, with supplementation by participant queries during the postoperative visit after the respective timepoint.
Within 12 months after surgery

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Sponsor

Investigatori

  • Investigatore principale: Brett Hayden, MD, Icahn School of Medicine at Mount Sinai

Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Stimato)

1 settembre 2026

Completamento primario (Stimato)

1 febbraio 2028

Completamento dello studio (Stimato)

1 febbraio 2029

Date di iscrizione allo studio

Primo inviato

30 luglio 2026

Primo inviato che soddisfa i criteri di controllo qualità

30 luglio 2026

Primo Inserito (Effettivo)

5 agosto 2026

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

5 agosto 2026

Ultimo aggiornamento inviato che soddisfa i criteri QC

30 luglio 2026

Ultimo verificato

1 luglio 2026

Maggiori informazioni

Termini relativi a questo studio

Parole chiave

Altri numeri di identificazione dello studio

  • Study 26-00680

Piano per i dati dei singoli partecipanti (IPD)

Hai intenzione di condividere i dati dei singoli partecipanti (IPD)?

NO

Descrizione del piano IPD

No individual participant data is planned to be shared with other researchers.

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

No

prodotto fabbricato ed esportato dagli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .