Stabilized Knee


The Stabilized Knee is the perfect choice for less active transfemoral amputees.

This weight-activated stance control knee features a stainless steel wave spring extension assist allowing for a smoother gait, while aiding in noise reduction. Its strong, lightweight titanium design incorporates this weight-activated stance control feature and both distal and proximal connectors.

Product Highlights:
  • U.S. Activity Levels 1 & 2
  • Available in Titanium or Stainless Steel
  • Extension Assist Design Featuring Stainless Steel Spring Extension Aid
  • Weight Activated Stance Control Feature
  • Proximal and Distal Pyramid Connections
Weight Titanium: Knee 357 g + Extension Assist 90 g = 447 g
Stainless Steel: Knee 525 g + Extension Assist 90 g = 619 g
Patient Weight Limit* 250 lbs/115 kg*
U.S. L-Code Suggestions Knee: L5812; Extension Assist: L5850
U.S. Warranty  12 months from date of patient fitting

* Body weight plus any loads normally and routinely carried cannot exceed this weight limit. 

Product No. Description
STK-221 Titanium Stabilized Knee (Modular)
STK-222 Titanium Stabilized Knee (Modular), with extension assist
STK-224 Stainless Steel Stabilized Knee (Modular), with extension assist

Stabilized Knee Instructions 

Fasteners & Torque
 M6 x 25 mm Socket Head Capscrew  5 ft-lbs/7 Nm
Related products:
STK-003 Spring Adjustment Clamp
STK-004 Protective Cover
STK-100 Extension Assist Assembly

Find Your Liner Part Number

Enter an Alpha® Liner serial number and the corresponding part number will display.


Thank you for choosing Alpha Liners!