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Hinge vs CCK Implants

Recruiting

A Randomized Controlled Trial Comparing Reoperation Rates and Clinical Outcomes of Rotating Hinge Versus Condylar Constrained Knee Implants in Revision Total Knee Arthroplasty

Who can join

Ages 18 to 80 · All sexes

Full eligibility criteria

Inclusion:

* Undergoing a revision total knee arthroplasty for any etiology
* Requires revision of both tibial and femoral components

Exclusion:

* Undergoing primary total knee arthroplasty
* Candidate for only rotating hinge knee implant
* Diagnosed with active infection
* Does not meet age criteria of \>18 or \<80
* Pregnant or breastfeeding
* Unable to consent
* Non-independent dweller (prisoner)

About the study

The primary purpose of this study is to compare reoperation rates for rotating hinge knee implants versus condylar constrained knee implants when used in revision total knee arthroplasty. The secondary purposes are to compare patient satisfaction, loosening rates and clinical outcomes for RHK implants compared to CCK implants in rTKA. Additionally, knee range of motion and stability will be assessed and compared at all follow-up time points. We hypothesize that RHK implants provide patients undergoing rTKA with similar reoperation rates to those of patients who receive a CCK implant. The investigators hypothesize that patients who receive an RHK implant will have similar loosening rates and clinical outcomes compared to patients who receive a CCK implant. Lastly, knee stability and patient satisfaction may improve with the use of a rotating hinge device.

What is being tested

Condylar Constrained knee system. ( NexGen Legacy Condylar Constrained Knee by Zimmer Biomet) (device)
Rotating Hinge Knee ( NexGen Rotating Hinge Knee by Zimmer Biomet) (device)

Sponsor: Medstar Health Research Institute · Participants: 186 · Started: Feb 1, 2026

Contact the study team

Miles Hollimon, B.S. · Phone: (202) 444-8766

Official record on ClinicalTrials.gov — NCT07818343

Locations in the U.S.

District of Columbia	Medstar Georgetown University Hospital, Washington D.C.
Maryland	Medstar Montgomery Medical Center, Olney

From ClinicalTrials.gov, data retrieved Oct 2, 2026. Each study sets its own eligibility; the study team decides who can join.