Envelope Implant Studio

Functional-alignment-first: components are moved inside the published boundaries to balance the patient's own envelope (reference = the patient's own constitutional target, with a population laxity reference as fallback); only the residual drives femoral, tibial and patellofemoral geometry. The soft-tissue envelope is read per structure and a pre-op surgeon rating predicts the tier: force-minus-forceless opening per compartment across flexion, the correction vector of US 2009/0254002, used here to shape the implant rather than only to place it (US 8,172,775). Mapping constants are design hypotheses to validate, not cleared device rules.

Input

Kinematic envelope

Opening under a 147 N varus/valgus stress at the ankle minus the forceless pose, mm, at each flexion angle. The 2008 BrainLAB measurement taken in extension, sampled across the arc, with the tracked spreader of US 8,945,132 as the applicator.

mediallateral

Deformity anatomy

Pre-op surgeon rating

Rate in clinic from the stress exam and lateral X-ray. The rating predicts the envelope and the implant tier before the skin is open; the intra-op measurement then scores the prediction.

tier —

valgus · laxenvelope

Flexion30°

Output

Design sheet

Patellofemoral

Soft-tissue envelope