Medacta NextAR TKA Pivotal Trial

Last updated: September 22, 2025
Sponsor: Medacta International SA
Overall Status: Completed

Phase

N/A

Condition

Musculoskeletal Diseases

Treatment

NextAR TKA system

Clinical Study ID

NCT04844879
P02.022.02
  • Ages > 18
  • All Genders

Study Summary

The goal of this study is to assess the efficacy and safety of a navigation system providing personalized soft tissue balance data in medially-stabilized total knee arthroplasty (TKA).

Eligibility Criteria

Inclusion

Inclusion Criteria:

  1. Males and females aged over 18 years at time of surgery.

  2. Patients who are scheduled to receive Medacta GMK® Sphere system for primary TKA (class III, CE-marked).

  3. Patients with functional contralateral knee (i.e. without the need to use walkingaids).

  4. Patients willing and able to provide written informed consent for participation.

  5. Patients willing to comply with the pre and post-operative evaluation schedule.

Exclusion

Exclusion Criteria:

  1. Patients with one or more medical conditions identified as a contraindicationdefined by the labelling on any Medacta implants used in this study:

  • Patients presenting with progressive local or systemic infection

  • Muscular loss, neuromuscular disease or vascular deficiency of the affectedlimb, making the operation unjustifiable.

  • Severe instability secondary to advanced destruction of condralar structures orloss of integrity of the medial or lateral ligament

  1. Patients whose prospects for a recovery to independent mobility would be compromisedby known coexistent, medical problems.

  2. Patients affected by concomitant spine, hip, ankle or contralateral knee pathologiesthat can affect walking capacity.

  3. Patients unable to understand and take action.

  4. Patients with known allergy to the materials used.

  5. Patients in which Medacta GMK® Sphere system is used in emergency interventions.

Study Design

Total Participants: 40
Treatment Group(s): 1
Primary Treatment: NextAR TKA system
Phase:
Study Start date:
May 17, 2021
Estimated Completion Date:
June 18, 2024

Study Description

This is a prospective, multicentre, single-arm, open, confirmatory clinical investigation to assess the efficacy and safety of a navigation system providing personalized soft tissue balance data in medially-stabilized total knee arthroplasty (TKA).

Participants will be informed about the study, both orally and in writing, during a preoperative visit. The investigator will answer any questions that may arise and will collect the informed consent. During the study, enrolled participants will be able to withdraw at any time and for any reason.

The study is conducted according to the following schedule:

  • V1 : Inclusion during a preoperative visit

  • V2: Surgery

  • V3: Follow-up visit at 2 month post-surgery

  • V4: Follow-up visit at 6 months post-surgery

  • V5: Follow-up visit at 12 months post-surgery

The following data will be collected:

  • Oxford Knee Score (OKS), Knee Society Score (KSS), Forgotten Joint Score (FJS) and patient satisfaction at 6 months and 12 months of follow-up;

  • Radiological analysis at 2 and 12 months of follow-up;

  • Surgical time (min);

  • Necessity of soft tissue release to obtain ligament or patellar balance;

  • Time to discharge (days);

  • Device deficiencies and peri- and postoperative adverse events.

A web-based data collection tool will be used as Electronic Data Capture (EDC). All the information required by the protocol will be collected in electronic case report forms (eCRF).

The statistical analysis will be performed according to a pre-established statistical analysis plan. Missing values will not be replaced by estimated values but will be considered as missing in the statistical analysis.

Connect with a study center

  • Privatklinik Belair

    Schaffhausen, 8200
    Switzerland

    Site Not Available

  • Privatklinik Belair

    Schaffhausen 2658761, 8200
    Switzerland

    Site Not Available

  • Kantonsspital Winterthur

    Winterthur, 8401
    Switzerland

    Site Not Available

  • Privatklinik Lindberg

    Winterthur, 8400
    Switzerland

    Site Not Available

  • Kantonsspital Winterthur

    Winterthur 2657970, 8401
    Switzerland

    Site Not Available

  • Privatklinik Lindberg

    Winterthur 2657970, 8400
    Switzerland

    Site Not Available

  • Uniklinik Balgrist

    Zurich, 8008
    Switzerland

    Site Not Available

  • Uniklinik Balgrist

    Zurich 2657896, 8008
    Switzerland

    Site Not Available

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