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New registry aims to uncover why some osteoporosis patients get rare fractures

NCT ID NCT01747291

Knowledge-focused Sponsor: University Health Network, Toronto Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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 Results may not be published yet.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
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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study is building a registry of 300 people in Ontario who have had a rare type of thigh bone fracture called an atypical femur fracture. Researchers want to learn more about what causes these fractures, which have been linked to long-term use of osteoporosis drugs called bisphosphonates. By collecting detailed information from patients, they hope to identify risk factors and improve prevention.

What this could mean

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

What this could lead to
If successful, this study could identify risk factors and predictors for atypical femur fractures, helping doctors prevent them in the future.
What could go wrong
This is an observational registry, not a treatment trial. It may not find clear causes or lead to immediate changes in care.

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.

Participants

About 300 people

The number the study aims to enrol. It can still change while the study runs.

Start date

Jun 2009

Expected to finish

Dec 2028

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

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

Who is studied

primary or tertiary care clinic patients who have experienced an atypical fracture at any point in the past will be eligible for this observational study. Low trauma fractures are defined as fractures sustained with minimal force, such as a fall from standing height.

Ages

20 to 100 years

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 over the age of 20; * Patients who have experienced an incomplete AFF that satisfies the diagnostic criteria as set forth by the American Society of Bone and mineral Research (ASBMR) International Task Force on AFFs or a low (or no) trauma fracture that mimics the features described above at other sites. Exclusion Criteria: * Peri-prosthetic fractures; * High trauma fractures; * Pathological fractures secondary to metastases or metabolic bone diseases other than osteoporosis.

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Conditions

The condition(s) this trial relates to.

osteoporosis

As listed by the trial registrant

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

Atypical femur fracture Atypical subtrochanteric fracture Osteoporosis with aff

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    3 sites. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • McMaster University

    ENROLLING_BY_INVITATION

    Hamilton, Ontario, Canada

  • St Michael's Hospital

    ENROLLING_BY_INVITATION

    Toronto, Ontario, Canada

  • University Health Network

    RECRUITING

    Toronto, Ontario, M5G 2C4, Canada

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