TAR Design Platform | AI-Powered Tibial Analysis

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Step 1: Patient Information

Enter patient demographics and activity level

cake Patient Demographics

Age

yrs

Body Weight *

directions_walk UCLA Activity Level (1-10)

Select the level that best describes the patient's activity

Reference: Amstutz HC, Thomas BJ, Jinnah R, et al. Treatment of primary osteoarthritis of the hip. J Bone Joint Surg Am. 1984;66(2):228-241. | Zahiri CA, Schmalzried TP, Szuszczewicz ES, Amstutz HC. Assessing activity in joint replacement patients. J Arthroplasty. 1998;13(8):890-895.

warning High-Impact Activities (Check if applicable)

Running/Jogging Soccer/Football Basketball Heavy Labor Hiking (uneven terrain) Jumping Sports

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Activity assessment helps evaluate TAA candidacy – it does not affect implant sizing. High-activity patients may have increased wear rates.

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Step 2: Fibula Measurements

Enter geometry from imaging data

view_in_ar Fibula Geometry

info 📏 Reference Guide: Asian Population (X-ray Based)

Based on radiographic studies of Asian populations:

Fibula Width (dx)
45–52 mm
Mean: ~48.5 mm ± 3.2 mm

Fibula Depth (dz)
38–45 mm
Mean: ~41.0 mm ± 2.8 mm

📖 References: Morphometric studies on Malaysian/Southeast Asian tibial plafond dimensions. Values are approximate and should be verified with patient-specific imaging.

Width (dx) Asian range: 45-52mm

Depth (dz) Asian range: 38-45mm

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Step 3: Generate Prediction

Review calculated loading and generate results

bolt Estimated Loading (Auto-calculated)

auto_fix_high Forces calculated from patient weight × activity multiplier

Peak Axial Force (Y)

--- N

Activity Multiplier

---×

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Prediction Results & 3D Model

Suggested dimensions and interactive visualization

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Estimation Only: Fibula-based sizing is for inventory/quick reference. Always confirm with CT templating and intraoperative tibial plafond measurement.

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26×28

29×31

32×35

35×38

38×42

width Suggested Width

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height Suggested Depth

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speed Predicted Equivalent Stress

---

straighten Width: --- mm

height Depth: --- mm

touch_app Drag to rotate • Scroll to zoom

check_circle --- TAA Candidacy Assessment

Clinical Note: This assessment is based on the UCLA Activity Scale and patient demographics. Final surgical decision should consider complete clinical evaluation, imaging, and patient preferences.

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AI Assistant

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smart_toy AI Response

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Reference: Baseline Analysis

ANSYS simulation reference values & methodology

straighten Max Deformation

compress Max Stress

swap_vert Max Normal Strain

science Prediction Methodology

This tool uses a Design of Experiments (DOE) model from ANSYS for accurate biomechanical predictions of tibial component performance.

verified κ = 0.85 — Almost Perfect Agreement

school Understanding This Prediction Tool

🔬 What is Finite Element Analysis (FEA)?

FEA is a computational method that divides complex structures (like a tibial implant) into thousands of small elements to calculate stress, strain, and deformation under applied loads. This tool uses FEA results from ANSYS Workbench — industry-standard engineering simulation software used in medical device design.

⚙️ How Does the Prediction Work?

Using Design of Experiments (DOE), we ran multiple FEA simulations with varying dimensions and forces. The results create a predictive model that estimates biomechanical outcomes for new input values — without running a full simulation each time. This allows real-time, chairside predictions.

📊 What Does κ = 0.85 (Kappa) Mean?

Cohen's Kappa (κ) measures the agreement between predicted values and actual FEA simulation results — accounting for chance agreement. It is a statistical measure of prediction reliability.

Kappa Range	Agreement Level
0.00 – 0.20	Slight
0.21 – 0.40	Fair
0.41 – 0.60	Moderate
0.61 – 0.80	Substantial
0.81 – 1.00	✓ Almost Perfect

κ = 0.85 means our predictions agree with actual FEA results at an "Almost Perfect" level — providing high confidence in the suggested tibial component dimensions and stress predictions.

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IMPLANT PLACEMENT ZONE

The tibial component is placed at the distal tibia, forming the upper articular surface of the ankle joint replacement.

It interfaces with the talar component to restore natural ankle motion and weight distribution.

location_on Distal Tibia — Ankle Joint