How It Works

Precision TPLO Planning in 6 Simple Steps

From image upload to surgical plan in under 60 seconds, with measurements to 0.1 mm

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A completed osAlign TPLO plan showing landmarks, the tibial plateau angle, the planned osteotomy, an aligned plate, and millimeter measurements on a lateral stifle radiograph

A finished plan: calibrated image, four landmarks, calculated TPA, osteotomy, and an aligned plate.

Upload Your Images

Start by uploading radiographs or importing DICOM files directly

Drag and drop X-ray images

Import DICOM files directly

Automatic image calibration from DICOM metadata

Support for multiple image formats

Radiographs panel with an upload-or-drop zone and an uploaded X-ray thumbnail — Drag and drop X-rays or import a DICOM study straight into the case.

Calibrate & Set Scale

Ensure accurate measurements by setting the image scale

Set known distance for calibration

Automatic DICOM pixel spacing detection

Manual calibration with reference objects

Save calibration settings for future use

Calibration panel with a measured line drawn across a scale marker in the radiograph — Draw a line over a known distance, set the value, and every downstream measurement is accurate.

Place Landmarks

Mark anatomical landmarks or let AI detect them automatically

AI-powered landmark detection (Pro+)

Manual landmark placement and adjustment

4 key anatomical points for TPA calculation

Real-time guidance for proper placement

Landmarks panel guiding placement of the four tibial points, highlighting which point comes next — osAlign walks you through each of the four tibial landmarks in order.

Calculate TPA

Automatically calculate the Tibial Plateau Angle

One-click TPA calculation

Automatic perpendicular line generation

Visual angle arc display

Accurate measurements with saved annotations

All four landmarks placed with the tibial plateau angle of 33.1 degrees calculated and displayed — With all four points set, the TPA is calculated and drawn on the image in one click.

Plan Your Osteotomy

Use advanced tools to plan the surgical approach

Blade-radius-aware saw cut circle

Curved-edge bulge control to match real blade geometry

Direct-manipulation rotation of the cut segment

Rotated segment renders live with the new plateau angle

Saw cut tool with a blade-radius circle overlaid on the proximal tibia, ready to cut — Dial in blade radius, arc, and rotation, then preview the new plateau angle before you commit.

Overlay the Plate

Drop a real plate onto the radiograph and align it like you would on paper

Plate catalog organized by manufacturer

Choose plate type, size, side, and view

Real SVG plate renderings, not generic rectangles

Export to PDF and share the finished plan with your team

Plate overlay tool with a manufacturer plate SVG aligned on the proximal tibia — Pick the manufacturer and size, then drag and rotate a true-to-geometry plate into place.

Why Veterinarians Choose osAlign

Transform your TPLO surgical planning workflow

Save Time

Reduce planning time from around 30 minutes to under 60 seconds with AI assistance

Plan to 0.1 mm

Lengths to 0.1 mm and angles to 0.1° on a calibrated radiograph, with every line shown for you to verify

Streamline Workflow

Integrated DICOM connection and automatic preplanning eliminate manual steps

Collaborate Easily

Share cases, templates, and reports with your entire surgical team

AI-Powered Planning

AI places the four tibial landmarks for you to confirm and the TPA is calculated instantly. AI features are rolling out across Q4 2026 into 2027, building toward the full agentic release.

AI landmark detection you review and confirm

More AI planning features rolling out Q4 2026 into 2027

Continuous learning from veterinary expert feedback

The osAlign planning workspace tool panel showing Calibrate, Landmarks, Saw Cut, Implant Overlay, and the AI Planning Tools

Seamless Integration

Works with your existing systems

DICOM Integration

Connect directly to your hospital systems for seamless image import and workflow automation (Pro & Enterprise)

DICOM Support

Full DICOM file support with automatic metadata extraction and pixel spacing calibration

Cloud Storage

Secure cloud storage with automatic backups and access from any device

The Result

From Plan to Surgery

The plan you build in osAlign carries straight into the operating room

The osAlign pre-operative TPLO plan with landmarks, calculated TPA, planned osteotomy, and an aligned plate on a lateral stifle radiograph

Before: the osAlign plan

Post-operative radiograph showing the TPLO plate and screws fixed to the tibia after surgery

After: the post-op radiograph

New to TPLO Planning?

Our guides explain the surgery, the measurements, and the math behind every step

How to plan a TPLO

Step-by-step TPLO preoperative planning: radiograph, calibration, TPA landmarks, saw blade and osteotomy, rotation distance, plate templating, and export.

What is TPLO surgery?

How TPLO surgery works: cranial cruciate ligament disease, tibial thrust, the tibial plateau angle, the osteotomy and plate, recovery, and complications.

Tibial plateau angle (TPA)

What the tibial plateau angle is, the four landmarks used to measure it, typical TPA values in dogs, target post-op TPA, and sources of measurement error.

Planning to 0.1 mm precision

How to plan a TPLO to 0.1 mm: calibration, landmark geometry, true-size saw cuts, live rotation with arc length, plate templates, and what limits accuracy.

AI in TPLO planning

Can AI plan a TPLO? What automated landmark detection and TPA measurement achieve today, what the research shows, and why surgeon verification still matters.

TPLO rotation and saw blade selection

How to choose a TPLO saw blade radius, position the osteotomy, and calculate rotation distance, with the formula, a worked example, and a rotation table.

Ready to Transform Your TPLO Planning?

Join veterinary surgeons who are already saving time and improving outcomes with osAlign

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