Sports medicine guide | Cortical suspensory fixation
Cortical button fixation is a suspensory fixation method used in selected ligament and tendon reconstruction procedures. A button rests against cortical bone and works with a fixed or adjustable suture loop to maintain the planned graft or soft-tissue construct. The device provides mechanical fixation while biological healing develops, but it does not independently guarantee faster healing, fewer complications or an earlier return to sport.
What Is Cortical Button Fixation?
Cortical button fixation, also called cortical suspensory fixation, uses a small button positioned against the hard outer cortex of bone. A loop or suture construct connects the button to a tendon graft, ligament graft or repaired soft tissue. Once deployed in the intended position, the button provides a cortical support point for the suspended construct.
In ACL reconstruction, for example, a femoral cortical button may support a graft within a prepared femoral socket or tunnel. Other button systems are designed for different anatomical regions and procedures. These products are not interchangeable merely because they share a similar shape.
Main Components of a Cortical Button Construct
Cortical Button vs Cortical Screw
A cortical button is not the same as a conventional cortical bone screw. A standard cortical screw uses threads to engage bone and is commonly associated with fracture fixation or plate constructs. A cortical button generally provides suspensory fixation through a button-and-loop or button-and-suture construct.
Do not confuse the products: a 2.7, 3.5 or 4.5 mm cortical bone screw should not be described as a required component of routine ACL cortical button fixation unless the exact authorized system and surgical technique specifically include it.
Fixed-Loop vs Adjustable-Loop Cortical Buttons
Femoral cortical suspension devices used in ligament reconstruction are often discussed as fixed-loop or adjustable-loop systems. The distinction affects graft preparation, tunnel or socket planning, deployment and tensioning workflow.
The loop has a predetermined length. Tunnel depth, graft length and button passage must be planned around that fixed dimension.
The loop length can be adjusted during the procedure within the limits and technique of the specific system, allowing the graft to be advanced or tensioned after button deployment.
What Laboratory Testing Measures
Biomechanical evaluation may report cyclic displacement, loop elongation, stiffness, yield load and load to failure. These tests help characterize device behavior under a defined laboratory protocol, but the results depend on the test fixture, specimen, loading direction, preload, cycling protocol and endpoint.
A higher load-to-failure value in one laboratory study does not prove faster tendon-to-bone healing or a lower clinical failure rate. Laboratory results should be considered alongside clinical evidence and the complete surgical construct.
What Clinical Evidence Shows
A systematic review of adjustable-loop femoral cortical suspension devices found a difference between laboratory and clinical findings: several laboratory studies reported loop elongation under cyclic loading, while the clinical studies reviewed did not demonstrate clear differences between adjustable- and fixed-loop groups in stability, knee scores or graft failure. The authors called for more robust randomized clinical trials.
Accordingly, neither loop category should be described as universally superior. Selection should account for the graft plan, tunnel strategy, device instructions, surgeon familiarity and relevant clinical evidence.
Common Surgical Applications of Cortical Button Fixation
Cortical button designs are used in several orthopedic procedures, but the indication depends on the exact device labeling. A button cleared or registered for one procedure should not be assumed to be authorized for every tendon, ligament or joint.
ACL and PCL Reconstruction
Cortical suspensory fixation is commonly used on the femoral side of selected ACL reconstruction techniques and may also be incorporated into selected PCL or all-inside constructs. The button supports the graft through a loop while the graft occupies the prepared tunnel or socket.
Clinical outcome depends on more than the button. Tunnel position, graft type and preparation, fixation on both sides, tensioning, associated injuries, rehabilitation and patient factors all contribute. Readers can review the broader role of ACL backup fixation systems and the related guide explaining how backup fixation supports ACL reconstruction.
Distal Biceps Tendon Repair
Procedure-specific cortical button systems may be used to secure a distal biceps tendon to the radius. Evidence from this operation cannot be transferred directly to ACL reconstruction because the anatomy, loading, surgical exposure and complication profile are different.
Published reviews report generally favorable functional outcomes but also describe nerve injury, button malposition or disengagement, heterotopic ossification, rerupture and wound complications. These risks should remain visible whenever distal biceps evidence is discussed.
Ankle Syndesmosis and Other Soft-Tissue Fixation
Selected suture-button systems may be labeled for syndesmosis stabilization or other soft-tissue fixation procedures. These constructs often use two buttons connected by high-strength suture, but their surgical objective and mechanics differ from femoral ACL suspension.
Other procedure-specific applications may include selected ligament or tendon reconstructions in the shoulder, elbow, foot or ankle. The applicable indications, contraindications and instruments must be checked for the exact product and destination market.
Latarjet and Other Specialized Techniques
Suture-button fixation has also been investigated for coracoid graft fixation in the Latarjet procedure. Comparative evidence indicates tradeoffs rather than universal superiority: screw fixation may show lower recurrent instability in some pooled analyses, whereas button fixation may show fewer reoperations related to hardware. Total complications and other outcomes may not differ clearly.
For that reason, Latarjet data should not be used as proof that cortical buttons are always safer, more stable or better for healing across unrelated procedures.
How Cortical Buttons Support Tendon-to-Bone Healing
A cortical button provides mechanical fixation intended to maintain the planned position of a graft or tendon while biological healing develops. It does not create healing by itself. Tendon-to-bone integration is influenced by graft contact, motion at the interface, bone and tissue quality, tunnel preparation, construct stability, rehabilitation and patient biology.
Mechanics and biology are different: strong initial fixation is an important engineering objective, but it does not guarantee graft incorporation, pain relief, joint stability, return to sport or freedom from revision surgery.
General Surgical Workflow
The surgical workflow varies by procedure and system. The following is a high-level explanation of cortical suspensory graft fixation, not a surgical technique or patient instruction.
Incorrect button position or soft-tissue interposition between the button and cortex may compromise fixation. Intraoperative visualization, imaging or other confirmation methods depend on the technique. The button should not be assumed to have deployed correctly based only on tactile feedback.
Cortical Button vs Other Fixation Methods
Fixation comparisons are meaningful only when they involve the same procedure, graft, anatomical site and outcome. It is misleading to compare a femoral ACL cortical button with a distal biceps suture anchor or a Latarjet screw and present the result as a universal ranking.
| Fixation category | General mechanism | Procedure-specific considerations |
|---|---|---|
| Cortical button | Suspends the graft or soft tissue from a button supported by cortical bone | Button seating, loop behavior, cortical integrity, tunnel geometry and soft-tissue interposition |
| Interference screw | Provides aperture fixation by compressing a graft within a tunnel | Screw material and size, graft damage, tunnel fit, bone quality and removal or revision considerations |
| Suture anchor | Connects soft tissue to bone through an anchor-and-suture construct | Anchor material, insertion angle, bone quality, knotless or knotted design and tissue pattern |
| Staple or backup fixation | Provides supplementary or surface fixation according to the implant design | Local anatomy, graft position, prominence, fixation sequence and whether it is primary or backup fixation |
Cortical Button vs Interference Screw in ACL Reconstruction
These methods fix a graft in different ways and may be used on different sides of the same reconstruction. A cortical button provides suspensory fixation, while an interference screw provides fixation near the tunnel aperture. Clinical comparisons depend on the entire ACL technique rather than the isolated implant.
Cortical Button vs Suture Anchor in Tendon Repair
Biomechanical studies may compare load to failure or displacement, but clinical selection also depends on surgical exposure, anatomical footprint, bone stock, risk to nearby nerves, rehabilitation and the available device indication. XC Medico groups separate suture anchor systems because an anchor is not simply another name for a cortical button.
Primary vs Backup Fixation
A cortical button may be the primary suspensory fixation in one procedure, while a staple, screw or other implant may serve as backup fixation in another. The ligament fixation staple system is therefore a distinct product category rather than a cortical button component.
Risks and Technical Limitations
No cortical button system is free from risk. The relevant complications depend on anatomy and procedure, but the following issues may need consideration:
- Button malposition: the implant may not seat against the intended cortical surface.
- Soft-tissue interposition: tissue can become trapped between the button and bone.
- Migration or disengagement: loss of the intended button position can compromise the construct.
- Loop elongation or graft motion: displacement under cyclic loading may affect the fixation environment.
- Tunnel widening: tunnel changes are multifactorial and may be associated with graft motion, biology and technique.
- Cortical compromise: an inadequate tunnel exit, cortical blowout or poor bone quality may affect support.
- Neurovascular injury: the risk depends on surgical approach, drilling direction, anatomy and procedure.
- Infection, stiffness or tissue failure: general and procedure-specific surgical complications remain possible.
Evidence must stay procedure-specific: complication rates from distal biceps repair should not be presented as ACL complication rates, and Latarjet recurrence or reoperation data should not be used to predict tendon-to-bone healing in the knee or elbow.
How Do Surgeons Select a Cortical Button?
Selection is based on the complete reconstruction plan rather than a marketing claim about strength. Important considerations include:
- authorized anatomical indication and destination-market registration;
- fixed-loop or adjustable-loop workflow;
- button dimensions and cortical footprint;
- loop material, length range and adjustment method;
- graft type, diameter and prepared length;
- tunnel or socket diameter, depth and cortical integrity;
- bone quality and revision status;
- compatible drills, guides, passing sutures and tensioning instruments;
- fixation planned on the opposite side of the reconstruction;
- surgeon training and procedure-specific technique.
FDA device documentation for a cortical fixation system lists insufficient cortical bone quality or quantity as a potential contraindication. Product-specific contraindications must therefore be reviewed rather than assuming that cortical fixation is appropriate for every patient.
Cortical Fixation Systems for Hospitals and Distributors
Hospitals, distributors and OEM/ODM partners should evaluate the complete ligament fixation portfolio, not only the visible titanium button. XC Medico's orthopedic and sports medicine systems include multiple fixation categories for professional use.
The ligament fixation titanium plate and button categories should be assessed by catalogue number, intended use, material, loop specification and compatible instruments. Procurement teams should request current documentation for the exact configuration and market.
| Procurement checkpoint | What to verify |
|---|---|
| Indication | Exact ligament, tendon, joint and fixation use stated in current product labeling |
| Device configuration | Button dimensions, loop type, loop range, suture material and available variants |
| Instrumentation | Compatible drills, tunnel guides, depth gauges, passers and tensioning tools |
| Mechanical evidence | Applicable cyclic loading, displacement and failure testing for the final device configuration |
| Documentation | Certificates, instructions for use, traceability, sterile status and shelf-life information |
| Market access | Registration and permitted claims for the destination country or region |
For professional procurement: request the current ligament fixation catalogue, device specifications, compatible instrument list and market-specific regulatory documents before selecting a cortical fixation system.
Frequently Asked Questions About Cortical Button Fixation
What is cortical button fixation?
It is a suspensory fixation method in which a button rests against cortical bone and connects through a loop or suture construct to a tendon graft, ligament graft or repaired soft tissue.
Is a cortical button the same as a cortical screw?
No. A cortical button usually works as part of a suspensory button-and-loop construct. A cortical screw uses threads to engage bone and belongs to a different fixation category.
What is the difference between fixed-loop and adjustable-loop buttons?
A fixed-loop device has a predetermined loop length. An adjustable-loop device allows loop length to be changed according to its specific deployment and tensioning technique.
Does cortical button fixation make an ACL graft heal faster?
It provides mechanical fixation while biological healing develops, but it does not guarantee faster graft incorporation. Healing depends on the complete reconstruction, tissue biology, tunnel preparation, stability, rehabilitation and patient factors.
Is an adjustable-loop button better than a fixed-loop button?
Not universally. Laboratory studies have identified biomechanical differences, while clinical studies have not consistently shown clear superiority in stability, knee scores or graft failure. Selection should be procedure- and system-specific.
What complications can occur?
Possible issues include malposition, soft-tissue interposition, migration, loop elongation, tunnel widening, fixation failure and procedure-specific nerve, vascular, infection or stiffness complications.
Medical and Regulatory References
- Adjustable Loop Femoral Cortical Suspension Devices for ACL Reconstruction: A Systematic Review.
- All-Inside ACL Reconstruction with Suspensory Cortical Button Fixation: Systematic Review and Meta-Analysis.
- Clinical Outcomes and Complications of Cortical Button Distal Biceps Repair: A Systematic Review.
- Screw Fixation versus Suture-Button Fixation for the Latarjet Procedure: Systematic Review and Meta-Analysis.
- U.S. FDA 510(k) Documentation: Cortical Fixation System Intended Use and Contraindications.
