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Knee implant study halted early: what we know

NCT ID NCT00734110

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early This study
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looked at how well the P.F.C. Sigma knee replacement implant works in people with severe knee arthritis. Researchers planned to follow 723 patients for at least 5 years after surgery, tracking pain, function, and any complications. However, the study was terminated early, so the full long-term data is not available.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
P.F.C. Sigma Total Knee System (a knee replacement implant)
What this could lead to
If successful, this could confirm that the P.F.C. Sigma knee implant provides lasting pain relief and improved function for people with severe knee arthritis.
What could go wrong
The study was terminated early, so results may be incomplete. As a device study, individual outcomes vary and risks include implant failure, infection, or need for revision surgery.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 4

Runs after approval, following long-term safety and how well the treatment works in everyday use.

Participants

723 people

The number who actually took part.

Started

Jul 2000

Finished

Jun 2010

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

Children (under 18), adults (18 to 64) and older adults (65 and over)

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Patients who have given voluntary written informed consent to participate in this study. * Patients for whom primary Total Knee Replacement is indicated due to degenerative joint disease, including rheumatoid arthritis, osteoarthritis, avascular necrosis, and post-traumatic arthritis, which is causing pain, deformity, or limitation of function uncontrolled by medical treatment. * Patients who, in the opinion of the Investigator, are able to understand this study, co-operate with the investigational procedures and are willing to return to the hospital for all the scheduled post-operative follow-ups. * Male or female patients who are skeletally mature and for whom an appropriate size of device is available. Exclusion Criteria: * Patients scheduled for Revision Total Knee Arthroplasty, or who have had previous surgery to their knee except menisectomy, arthroscopy or synovectomy. * Patients experiencing any condition that may, in the opinion of the Investigator, interfere with the Total Knee Replacement's survival or outcome (e.g. Paget's disease, Charcot's disease, severe osteoporosis, etc.) * Patients who have evidence of active infections which may spread to other areas of the body (e.g. osteomyelitis, pyrogenic infection of the knee joint, overt infection, etc.). * Patients who are currently participating in any other clinical investigation of a device or pharmaceutical. * Patients having non-contained defects in the tibia or femur necessitating bone graft. * Patients with psychosocial disorders that would limit rehabilitation or follow-up. * Subjects with a known history of poor compliance to medical treatment. * Subjects who are known drug or alcohol abusers. * Other contraindications for the use of the P.F.C. ® S Knee System as listed in the package insert.

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Conditions

The condition(s) this trial relates to.

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Contacts and locations

Locations

  • Princess Alexandra Hospital NHS Trust

    Harlow, Essex, CM20 1QX, United Kingdom

More trials for these conditions

Other studies related to the condition(s) this trial covers.