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Compass Hinge Stabilization of Knee Dislocations: A Randomized Trial (CKH)

This study has been completed.
Smith & Nephew, Inc.
Information provided by (Responsible Party):
University of Alabama at Birmingham Identifier:
First received: December 18, 2007
Last updated: September 18, 2013
Last verified: September 2013
The purpose of this project is to evaluate the effect of the Compass™ Universal Hinge external fixator on the outcome of patients following acute dislocation of the knee

Condition Intervention
Knee Dislocation
Device: Compass Universal Hinge External Fixator
Procedure: Non-invasive External Knee Brace

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Compass Hinge Stabilization of Knee Dislocations: A Randomized Trial

Resource links provided by NLM:

Further study details as provided by University of Alabama at Birmingham:

Primary Outcome Measures:
  • Knee Stability [ Time Frame: 12 months ]
    The hypothesis of this study was that there would be equivalent final knee range of motion with fewer failures for ligament reconstructions following knee dislocations that were supplemented with the Compass Knee Hinge as compared to a control group.

Enrollment: 100
Study Start Date: August 2000
Study Completion Date: December 2008
Primary Completion Date: December 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Group A External Brace
Group A will have a non-invasive range of motion external brace placed following surgery
Procedure: Non-invasive External Knee Brace
For Group A patients, an external knee brace (several brands available and no one brace specified for this study) will be placed on the leg following surgical repair of the knee dislocation.
Experimental: Group B Compass Knee Hinge
Group B will have a Compass Knee Hinge placed
Device: Compass Universal Hinge External Fixator
Application of the Compass Knee Hinge adds approximately 30 minutes to the surgical time. After the apparatus has been in place for the appropriate amount of time (6-8 weeks), it is removed either in the clinical setting, or in the one-day surgery area of UAB Highlands.
Other Name: Compass Knee Hinge

Detailed Description:

Prospective randomized outcome study. Patients will be randomized either into the control group (Group A) or the study group (Group B) based on a computer generated randomization table. Both groups will undergo an identical surgical protocol, as outlined below. The only difference is that patients in Group A will have a range of motion external brace placed following surgery, while patients in Group B will have a CKH placed. The rehabilitation protocol for the two groups will be identical, as outlined below. Both groups will undergo an Anterior Cruciate Ligament (ACL) reconstruction on a delayed basis two months following surgery, if the ACL was torn during the knee dislocation. The ACL reconstruction will be delayed in both groups if a minimum range of motion of 10-90 degrees has not been attained.

Surgical Protocol : Approximately 10 - 21 days following the injury, patients will undergo the first surgical procedure on their knee dislocation. During the first procedure, they will have a Posterior Cruciate Ligament (PCL) reconstruction using an achilles tendon allograft, with the direct onlay, two bundle technique. Additionally, any damage to either the posterior medial or posterior lateral corner will be repaired (not reconstructed), and any meniscus pathology will be addressed. The final step of this first procedure will be applying the CKH to patients randomized to the compass group (the alignment pins will be placed prior to repair of the corner). Patients will undergo an ACL reconstruction (if necessary) approximately 8 weeks following the initial surgery, when the CKH will be removed. Additional surgeries will be performed on patients to treat motion problems/arthrofibrosis as well as recurrent instability on an "as-needed basis."

Rehabilitation Protocol - aggressive rehabilitation will be started on the day following surgery. Patients will be placed in Continuous Passive Motion (CPM) machines with an initial range of motion of 0 - 30 degrees. The hinge will be locked into full extension for at least 4 hours per day. We will continue CPM for two weeks, with a goal of increasing by at least 10 degrees per day to 90 degrees of flexion. Weightbearing will be allowed as tolerated with the hinge locked in extension.


Ages Eligible for Study:   19 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Trauma patient with a knee dislocation that requires surgical repair
  • Adult patient (19 years and older)

Exclusion Criteria:

  • Patients unable or unwilling to comply with follow-up gait, radiographic and clinical evaluations necessary to complete the study
  • Patients unable or unwilling to give informed consent and/or who have no responsible family member willing to give consent
  • Pregnant women
  • Prisoners
  Contacts and Locations
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Please refer to this study by its identifier: NCT00582517

United States, Alabama
The University of Alabama at Birmingham, Orthopaedic Trauma
Birmingham, Alabama, United States, 35294
Sponsors and Collaborators
University of Alabama at Birmingham
Smith & Nephew, Inc.
Principal Investigator: David A Volgas, MD The University of Alabama at Birmingham
  More Information

Responsible Party: University of Alabama at Birmingham Identifier: NCT00582517     History of Changes
Other Study ID Numbers: F000330008
OGCA Contract #200497 ( Other Identifier: UAB Link Number )
Study First Received: December 18, 2007
Results First Received: September 18, 2013
Last Updated: September 18, 2013

Keywords provided by University of Alabama at Birmingham:
Orthopaedic Trauma
Knee Dislocation
Compass Hinge External Fixator
External Brace

Additional relevant MeSH terms:
Knee Dislocation
Wounds and Injuries
Knee Injuries
Leg Injuries processed this record on May 25, 2017