Bio-Integrative, Fiber-Reinforced Kneebar for Treating Subchondral Insufficiency of the Knee

The OSSIOfiber® Trimmable Fixation Nails are indicated for maintenance of alignment and fixation of bone fractures, osteotomies, arthrodesis and bone grafts in the presence of appropriate additional immobilization (e.g., rigid fixation implants, cast, brace). Our hypothesis is that the use of OSSIOfiber® Trimmable Fixation Nails for treating subchondral insufficiency of the knee will result in improvement of patient-reported outcomes and imaging findings. The primary objective of this study is to evaluate the effectiveness of implanting bio-integrative OSSIOfiber® Trimmable Fixation Nails, organized in a bi-cortical rafter formation within the tibia or femur for the management of subchondral insufficiency. The OSSIOfiber® Trimmable Fixation Nails used in this study will be considered on-label.

Study Overview

• Status: Enrolling by invitation
• Conditions: Subchondral Insufficiency Fracture
• Intervention / Treatment: Device: OSSIOfiber® Trimmable Fixation Nails

• Study Type: Interventional
• Enrollment (Estimated): 10
• Phase: Phase 2

Contacts and Locations

Study Locations

• United States
  • Tennessee
    • Nashville, Tennessee, United States, 37232
      • Vanderbilt University Medical Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Agree to study participation and consent obtained.
• Able to attend all postoperative clinical visits, undergo imaging procedures, and complete relevant questionnaires.
• Subjects between the ages of 18 to 75 years.
• Body Mass Index < 40.
• Has knee pain in the study knee lasting at least 3 months and has had at least moderate pain recorded on a standard of care (SOC) preoperative Knee Injury and Osteoarthritis Outcome Score (KOOS) and/or Numeric Pain Reported Scale (0-10) questionnaire. The study team may utilize these verbal pain scores collected during the clinic intake process for screening purposes. If the patient was not administered the verbal pain score, the patient will be consented, administered the pain survey, and withdrawn if moderate pain score was not recorded.
• At least 3-months without steroid injection or any other non-surgical intervention administered to study knee.
• Candidate for knee arthroscopy due to meniscal tear, loose body, unstable articular cartilage or mechanical symptoms.
• Uni-compartmental Kellgren-Lawrence grade 2-3 osteoarthritis in the study tibia or femur.
• Bone Marrow Lesion (BML) confirmed on magnetic resonance imaging in the femur, tibia or both.
• Cartilage lesion on the tibial or femoral condyle(s) of a grading ≤4 by either the International Cartilage Repair Society or Outerbridge classifications verified at the time of arthroscopy.

Exclusion Criteria:

• Imaging evidence of the study knee that includes any of the following:

  1. Kellgren-Lawrence grade 4 osteoarthritis.
  2. Collapse of subchondral bone.
  3. Avascular Necrosis (AVN).
  4. Osteochondral defect overlying the BML
  5. BML located at ACL or PCL insertions

• Clinical evidence of the study knee that includes any of the following:

  1. History of rheumatoid arthritis, septic arthritis, reactive arthritis, gout or pseudogout, secondary arthropathy (e.g., hemochromatosis, hemophilia, or psoriasis).
  2. Osteochondritis dissecans.
  3. Frank ligamentous instability.
  4. Neuromuscular deficiency or other that would limit the ability to do a functional assessment.
• Bi-cortical nail implantation cannot be achieved, including where the required nail length is not yet available.
• Current tobacco use or has quit within 3 months of study enrolment.
• Substance abuse history.
• Diabetes mellitus, HbA1c>8
• High surgical risk due to pre-existing conditions.
• Currently pregnant or has plans to become pregnant prior to surgery.
• Active infection or history of chronic infection in study knee.
• Will require concomitant procedures within study knee, including but not limited to ligament reconstruction, tendon repair, meniscus repair, microfracture, osteotomy, or osteochondral transplantation (Meniscal tears, including chronic, are acceptable if no repair is required)
• Significant malalignment (varus or valgus) of the knee (>8°)
• Use of augmentation or concomitant biologic therapy during surgery.
• Contraindications to magnetic resonance imaging.
• Any condition which in the view of the treating physician makes it inadvisable for the subject to participate in the study.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Knee injury and Osteoarthritis Outcome Score (KOOS)	The overall KOOS score combines pain and function domains. KOOS is out 100, where 0 equates to extreme pain and 100 equates to no pain.	3 months post-operatively
Knee injury and Osteoarthritis Outcome Scale Score (KOOS)	The overall KOOS score combines pain and function domains. KOOS is out 100, where 0 equates to extreme pain and 100 equates to no pain.	6 months post-operatively

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Knee injury and Osteoarthritis Outcome Score for Joint Replacement (KOOS, JR.)	Measures the knee health of individuals following surgery	6 months post-operatively
International Knee Documentation Committee (IKDC) Subjective Knee Evaluation Form	IKDC measures: symptoms, athletic activity, and knee function.	6 months post-operatively
Veterans Rand-12 (VR-12) Health Survey Scale Score	VR-12 combines measures of general health perceptions, physical functioning, role limitations due to physical and emotional problems, bodily pain, fatigue , social functioning, and mental health	6 months post-operatively
Numeric Pain Reported Scale Score	Measures a subject's perceived pain level. This score is usually on a scale of 0-10 with 0 equating to no pain and 10 equating to the worst pain imaginable.	6 months post-operatively
PROMIS Pain Interference Score	Measures what level pain hinders a patient's engagement in several activities including social, cognitive, physical, and recreational activities. There are 7 sub items and each are rated from a scale of 0-10 where 0 means it does not interfere and 10 means it completely interferes. These contribute to a final score ranging anywhere from 0-70.	6 months post-operatively
PROMIS Depression Score	Measures self-reported negative mood (sadness, guilt), views of self (self- criticism, worthlessness), and social cognition (loneliness, interpersonal alienation), as well as decreased positive affect and engagement (loss of interest, meaning, and purpose). Each item on the measure is rated on a 5-point scale (1=never; 2=rarely; 3=sometimes; 4=often; and 5=always) with a range in score from 8 to 40. Higher scores indicate greater severity of depression.	6 months post-operatively
PROMIS Physical Function Score	Measures the level of physical function for patients with a wide variety of impairments that may limit the patient's physical capability. This score is on a scale from 0-100 with 0 equating to no physical function and 100 equating to optimal physical function.	6 months post-operatively
Incidence Assessments	Assessment of the incidence of re-operations, revision surgeries, or additional management of the study knee outside of postoperative rehabilitation.	Up to 6 month post-operatively
Degree of knee ligament healing	To see how the knee ligament is healing by MRI assessment.	Baseline and 6 months post-operatively
Adverse Events	Rate of postoperative adverse events and complications	Up to 6 month post-operatively

Collaborators and Investigators

• Sponsor: Vanderbilt University Medical Center

Study record dates

Study Major Dates

• Study Start (Actual): March 5, 2025
• Primary Completion (Estimated): March 5, 2027
• Study Completion (Estimated): December 5, 2027

Study Registration Dates

• First Submitted: May 7, 2024
• First Submitted That Met QC Criteria: May 15, 2024
• First Posted (Actual): May 21, 2024

Study Record Updates

• Last Update Posted (Actual): May 29, 2026
• Last Update Submitted That Met QC Criteria: May 26, 2026
• Last Verified: May 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Wounds and Injuries; Fractures, Bone; Fractures, Stress
• Other Study ID Numbers: OSSIOfiber Kneebar

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: Yes
• product manufactured in and exported from the U.S.: No