Overview

Posterior Shelf applies a posterior shelf shape to the socket, initially aligned to the Mid-Patellar Tendon (MPT). Use control points and shelf controls to adjust the shelf shape, depth, and contour to match the patient’s anatomy and design preference.

Video Tutorial

Tool Structure

Advanced Properties

Individual Curve Options

Posterior Shelf Utility Bar

Reset

Reset the Posterior Shelf.

Apply

Apply general posterior shelf template on the model

Tool Body

Position from Centerline

Use the slider bar to adjust the adjust the medial-lateral fit of the shelf to the limb.

Depth

Use the slider bar to adjust the depth of the shelf.

Corner Radius (Advanced Properties)

Use the slider bar to adjust the radius of the corners of the shelf.

Shelf Angle Adjustment (Advanced Properties)

Use the slider bar to adjust the angle the shelf is applied to the limb.

All Curve Height

Use the slider bar to adjust the curve between the posterior shelf and the limb.

Individual Curve Options

Use the slider bar to adjust the curve for each individual control point.

How to Use

Open the Posterior Shelf tool to apply a generic shelf shape aligned to the MPT.

(Optional) Confirm alignment to the MPT:

In Toggle Models, make the model opaque.

In Anatomical Landmarks, hover over the MPT to highlight the landmark on the model.

Click and drag the control points to shape the shelf as needed.

Use Shelf Controls to refine the shelf:

Position from Centerline: adjust the medial-lateral fit of the shelf.

Depth: switch to a medial view as needed, then adjust shelf depth (mm).

For advanced refinements, open Advanced Properties:

Corner Radius: adjust the radius at the shelf corners (proximal view can help).

Shelf Angle: adjust how much the sides angle in/out.

Adjust the curve between the control points and the limb:

All Curve Height: adjust all control points at once.

Individual Curve Options: adjust curve height per control point (e.g., to create a walnut shape to distribute pressure in the popliteal area).

(Optional) Save the shelf as a template:

In Templates, select Save as New to reuse the shelf shape and settings on other sockets.