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Can a computer guide hip surgeons to even out leg length?

NCT ID NCT07134036

Symptom relief Sponsor: China Medical University Hospital Source: ClinicalTrials.gov ↗

What the study statuses mean

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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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Oct 05, 2026 · Last updated Oct 06, 2026 · Updated 1 time

Summary

Researchers compare two ways of doing total hip replacement through a small front incision on a traction table. One group uses a computer navigation system to measure leg length during surgery, and the other uses standard techniques. The study includes 72 people with advanced hip arthritis, a dead hip bone, or a hip that formed abnormally. It measures how well the final leg length matches what patients felt before surgery and tracks pain and function scores.

What this could mean

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

Active substance
a computer navigation system used during hip replacement surgery
What this could lead to
If navigation helps, surgeons could use it to make leg lengths after hip replacement match what patients feel, reducing the need for further correction.
What could go wrong
This is a small, retrospective study of 72 patients, so it cannot prove cause and effect. Results may not apply to other surgeons, hospitals, or implant types.

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

72 people

The number who actually took part.

Started

Mar 2021

Finished

Sep 2021

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

Participants with a diagnosis of advanced hip osteoarthritis (OA), avascular necrosis (AVN), or developmental dysplasia of the hip (DDH) warranting THA were consecutively enrolled. The exclusion criteria included a documented history of prior hip joint infection, severe limb length discrepancy, significant spinal pathologies, and radiographs in which the lesser trochanters and teardrops were difficult to define. Severe limb length discrepancy was defined as a preoperative limb length discrepancy ≥ 5 cm, as such cases typically require additional lengthening procedures beyond standard total hip arthroplasty20, 21. Significant spinal pathologies were defined as concomitant spine and hip disorders associated with persistent neurological signs and/or spinal instability that could not be adequately managed with conservative treatment and were considered likely to affect spinopelvic balance or functional limb length perception.

Ages

20 years and older

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: * Clinical diagnosis of advanced hip osteoarthritis (OA) warranting total hip arthroplasty (THA) * Clinical diagnosis of avascular necrosis (AVN) of the femoral head warranting total hip arthroplasty (THA) * Clinical diagnosis of developmental dysplasia of the hip (DDH) warranting total hip arthroplasty (THA) Exclusion Criteria: * Documented history of prior hip joint infection * Severe limb length discrepancy requiring supplementary surgical interventions * Significant spinal pathology affecting spinopelvic balance * Radiographs in which the lesser trochanters and teardrops cannot be clearly defined

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Conditions

The condition(s) this trial relates to.

avascular necrosis avascular necrosis of femoral head, primary, 1 developmental dysplasia of the hip familial avascular necrosis of femoral head osteoarthritis, hip

As listed by the trial registrant

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

Developmental dysplasia of the hip Femur head necrosis Osteoarthritis, hip

Contacts and locations

Locations

  • China Medical University Hospital

    Taichung, 台中市, 404, Taiwan

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