Description:

ORTHOSEAT WASHER
A Next-Generation Upgrade to the Washered Anchor Extracapsular Repair Technique

The Problem with Traditional Washers

• Traditional ECS washers are overly large and domed, crowding the surgical field.
• They restrict the ability to tension and crimp effectively.
• Increase suture abrasion and soft-tissue retraction.
• Create variability in stabilization quality.

The OrthoSeat Solution

• Engineered to match the OD (Outer Diameter) of AO cortical screw heads.
• Produces a compact, flat-seat profile that maintains the working corridor between anchors.
• Improves suture alignment and enhances construct reproducibility.

Key Features

• Flat-seat engineering for stable, uniform load distribution.
• Ultra-low-profile footprint for a clean, unobstructed surgical field.
• Preserves crimping corridor for easier, repeatable tensioning.
• Reduces soft-tissue trauma and closure complications.
• Integrates seamlessly into existing extracapsular workflows.

The Washered-Anchor Technique

• A modern refinement of the lateral extracapsular stabilization method.
• Uses a washered screw at the tibial quasi-isometric point and either a fabellar or femoral anchor to reproduce isometric tensioning and predictable stabilization across flexion-extension.

Technical Specifications

Screw Size	Screw Head OD	OrthoSeat Target OD
2.0 mm	4.0 mm	4.1 mm
2.4 mm	4.0 mm	4.1 mm
2.7 mm	5.0 mm	5.1 mm
3.5 mm	6.0 mm	6.1 mm

Distributor Advantages

• High-demand implant for both GP and orthopedic surgeons.
• Clean add-on product to sutures, crimps, and ECS kits.
• No learning curve with instant adoption.
• Strong repeat-purchase pattern.
• Complements TPLO and TTA product lines without competing.

Material & Durability:

• Crafted from medical-grade 316L Stainless Steel
• Bio-inert and corrosion-resistant
• Engineered for permanent internal fixation

ORTHOSEAT WASHER (WASHERED-ANCHOR TECHNIQUE)

SIMPLER. CLEANER. MORE REPRODUCIBLE RESULTS

Design Features

• Designed to match the cortical screw head OD for a clean, ultra-low-profile footprint.

• Flat-seat geometry provides a stable, uniform load-bearing surface—no dome, no rocking.

• More room for tensioning and crimping between femoral and tibial anchors.

• Reduced soft-tissue trauma and smoother closure due to compact design.

• Maintains ideal suture glide path for consistent, repeatable stabilization.

Compatibility

Compatible with all standard AO cortical screws:

Compatibility Table

Screw Size	Washer OD
2.0 mm	4.1 mm
2.4 mm	4.1 mm
2.7 mm	5.1 mm
3.5 mm	6.1 mm

Clinical Benefits

• Enhances construct stability by preventing suture cut-through.

• Provides a more ergonomic tensioning angle, improving repeatability.

• Supports cleaner, faster extracapsular procedures with fewer workflow frustrations.

• Preserves the crimping corridor, improving suture alignment and tension control.

• Delivers a simple, elegant improvement to a familiar technique—no learning curve.

Technique Title: Washered-Anchor Technique (ORTHOSEAT WASHER)

Step 1—Approach:

• A routine lateral parapatellar incision is made.

• The lateral fascia is reflected caudally to expose the lateral fabella and the caudolateral femoral condyle.

• Meniscal inspection and any necessary debridement or release are performed prior to stabilization.

Step 2—Identify Isometric Points:

• Experimental work confirms true isometric points do not exist, but quasi-isometric pairs provide minimal distance change during flexion and extension.

• Femoral Isometric Point: Identified on the caudal edge of the femoral condyle adjacent to the cranial pole of the lateral fabella.

• Tibial Isometric Point: Located just distal and caudal to the insertion of the patellar ligament, immediately caudal to Gerdy’s tubercle along the caudal edge of the tibial extensor groove.

Step 3—Implant Placement:

• A washered cortical screw is placed at the tibial isometric point to prevent suture cut-through and distribute load evenly.

• The suture line (monofilament nylon or UHMWPE like LigaFiba® or FiberWire®) is passed to the proximal anchor.

• Proximal anchor options: The lateral fabella or a second washered screw at the femoral isometric point.

Step 4—Tensioning and Closure:

• Tension is applied until the cranial drawer test is negative and tibial thrust is neutralized.

• The suture is secured under the washers, maintaining consistent load without suture deformation.

Anchor Configurations:

Configuration Type	Description
Unilateral Anchors	Femoral – Lateral Fabella / Tibial – Washered Anchor
Bilateral Anchors	Femoral – Washered Anchor / Tibial – Washered Anchor