Segmental System - Testing and Analysis

Torsional Fatigue Test

  • Testing representing 10 years of stair-climb activity was completed.   All segment pairs completed testing without fracture, deformation or relative rotation between segments.¹ 

Combined Load Test

  • The distal femur was tested to simulate increased hyperextension forces typical of salvage knee cases.  After 5 million cycles no fracture or hinge component loosening had occurred.¹

Rotating Hinge Contact Area Analysis

  • The condylar geometry for the Segmental Distal Femur matches that of the NexGen® Rotating Hinge Knee.¹

Segmental System Stem Test

  • Segmental stems and cemented Trabecular Metal™ Material collars were paired with a MOST Options® proximal femur and cyclically tested at 7.5 times body-weight.  The components survived testing without fracture and with no evidence of loosening at the stem/collar interface.¹

Rotary Overhang Fatigue Test

  • Testing was performed to ensure that the tapered articular surfaces display adequate strength and durability.  Simulating approximately 20 years of squatting activity, all components survived the testing without fracture, delamination or excessive deformation.¹

Related Article

Overview

References:

  1. Data on file at Zimmer. The results of this testing have not been shown to correlate with clinical mechanisms.