Real-Time Instrument for Acetabular Shell Positioning

Study Overview
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Brief Summary
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The proposed study is a double-blinded randomized controlled trial comparing Real-time instruments with solely standardized instruments for the placement of the acetabular cup prosthesis used in total hip arthroplasty. The investigators will enroll 44 patients who have consented to total hip arthroplasty for treatment of hip pathology. This treatment is a standard of care. Patients will receive standard of care pre- and post-operative care and placement of standard of care implants all of which are commercially available and FDA approved for general use for the clinical indications used in these patients. All patients will receive a pre-operative CT scan for surgical planning and comparison with post-operative CT scan. The difference in intervention between the groups will be the creation and use of real-time instrument from the pre-operative planning session. These instruments will be used for placement of an indexing peripheral guide wire to direct acetabular preparation and placement of the shell assisting standard surgical instruments. The post-operative scan will be performed within two weeks of the surgery for both the treatment and control groups. The investigators will analyze the difference in acetabular shell placement (acetabular version and abduction angle) from the pre-operatively planned CT scan. These differences will be compared between the control and experimental groups.

Official Title
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Comparison of Acetabular Shell Position Using Real-Time Instruments vs. Standard Surgical Instruments: A Randomized Clinical Trial

Conditions
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Total Hip Arthroplasty

Intervention / Treatment
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* Device: Real-time Instrumentation
* Procedure: Standard Total Hip Arthroplasty


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Subjects to be included in this protocol will be adult males and females of all races and socioeconomic status meeting the following criteria: Primary, unilateral anterior or posterior total hip arthroplasty 18 to 85 years old at time of surgery Able to get a pre- and post-operative CT scan at the Cleveland Clinic Exclusion Criteria: Significant metal in the joint that results in metal artifact on the pre--operative CT scan, thereby compromising the ability to visualize the acetabulum on the pre-operative simulator. Pregnancy Incarceration Condition deemed by physician or medical staff to be non-conducive to patient's ability to complete the study, or a potential risk to the patient's health and well-being.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 85 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Standard Total Hip Arthroplasty<br>Each surgeon will use their standard methods of pre-operative planning using pre-operative x-rays, and complete the procedure using standard surgical instruments for total hip arthroplasty. | Procedure: Standard Total Hip Arthroplasty<br>* Total hip arthroplasty performed according to standard of care<br>|
| Experimental: Real-time Instrumentation<br>Pre-operative planning through 3D software with design of real-time instrument intraoperatively using bone cement and surrogate bone model for placement of a guide pin to be used to aid in bone preparation for insertion of an acetabular cup in total hip arthroplasty | Device: Real-time Instrumentation<br>* To prepare the acetabulum and place the implants on the day of surgery, surgeons will receive either parts necessary to create the real-time with a surrogate model of the acetabular surface or standard surgical alignment instruments provided by the manufacturer of the implant. For the experimental group, the surgeon will be provided with 3 parts necessary to create the real-time instrument: (1) a patient-specific surrogate bone model with a built-in guide pin trajectory which was planned in the 3D planning software, (2) a non-specific plastic arm available in different sizes, and (3) bone cement. The real-time instrument is created to position a peripheral guide wire on the acetabular rim to serve as a visual aid for reaming and impacting the acetabular shell using standard reaming tools supplied by the manufacturer. Once the acetabular shell is placed, the procedure is performed in the same manner for both groups, using the standard manufacturer instruments.<br>* Other names: RTI;Procedure: Standard Total Hip Arthroplasty<br>* Total hip arthroplasty performed according to standard of care<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Difference Between Planned and Actual Values of Abduction | The overall difference in component placement between standard of care instrumentation and real-time instrumentation will be compared. | Through 2 weeks after surgery. | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Difference Between Planned and Actual Values of Version | The overall difference in component placement between standard of care instrumentation and real-time instrumentation will be compared. | Through 2 weeks after surgery | 
| Difference in the Time for Acetabular Preparation and Shell Placement Between the Two Groups | Difference in the time for acetabular preparation and shell placement between the two groups were not collected | Intraoperatively (during surgery) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Total Hip Arthroplasty, Acetabular positioning, Patient specific instrumentation, Preoperative planning