Another option is the weight-activated stance-control knee


Case Study 3
The knee will not buckle under wight force, it will be kept in full knee extension
Very stable knee
Can eliminate gait deviations associated with stiff legged gait
Missteps can be corrected
Simple design
Low cost
Most durable
Lightest option available
Knee flexion only occurs if weight is fully removed from the prosthesis
Delayed initiation of swing phase
Walking at a faster pace disrupts/ changes the break stability and can interfere with knee flexion during pre-swing
Requires good muscular power for voluntary stability control
Appropriate for elderly clients
Clients with slow walking pace
Less active clients
Children
Can and is commonly used for a first transfemoral prosthesis
Amputee Coalition of America.

A stance control knee joint design was created in the ..

Mobility function of a prosthetic knee joint with an automatic stance phase lock.

OTTO-BOCK-3R49-PROSTHETIC-STANCE-CONTROL-TITAN-KNEE …

The following are the only HCPCS codes billable for Ossür Power Knee or any similar swing and stance phase microprocessor controlled knee system with powered and programmable flexion/extension assist:

Stance Control Knee by Mel Khalil on Prezi

The following HCPCS codes are the only codes billable for the above-listed products or any similar swing and stance phase microprocessor controlled knee system:

Energy Expenditure and Activity of Transfemoral Amputees Using Mechanical and Microprocessor-Controlled Prosthetic Knees.
The stance control knee remains extended through stance phase all the way through to terminal stance : pre swing , were it then flexes.

of above-knee prostheses: Knee control versus SACH ..

The following are the only HCPCS codes billable for Otto Bock C-Leg Compact or any similar stance phase only microprocessor controlled knee system:

The stance control knee is speed dependent- false6- There are 5 knee units which exhibit stance control.

knee with weight activated stance control ..

Recent claim reviews note that suppliers are billing miscellaneous code L5999 (lower extremity prosthesis, not otherwise classified) for various elements of microprocessor-controlled knee systems such as the Otto Bock C-Leg®, C-Leg Compact™, or Genium™. This use of miscellaneous codes is not correct. For example, functions performed by the on-board microprocessors and/or sensors (e.g., "real-time gait assessment," "electronically controlled static stance regulator, adjustable"), or programming necessary for use, must not be billed using L5999. Use of additional codes is limited to those specified below. There is no separate billing and reimbursement for any other features or functions since the allowance for all functions and features is included in the payment for codes listed below.

This knee is very stable and is often prescribed for a first prosthesis

Control of Powered Knee Joint Prosthesis Based on …

1997.)
Alignment
Alignment stability;

Can be achieved through placing TKA line posterior to the Knee axis (6-10mm - Ottobock 5-15mm)
Exceeding extension moment will decrease voluntary control and vice versa
If Fast knee flexion seen, it is due to late change of GRF moving posterior to knee

Voluntary Stability

Keep GRF anterior to knee to give muscles best position for control without causing fatigue and strain i.e hip extensors
Alignment requires both stability and voluntary control to work simultaneously;

Phases of the Gait Cycle with a Weight Activated Stance Control Knee
Stance Phase;



Swing Phase;

5 knee units fall into one of the three basic categories depending on the fundamental physical principle of its operation:
Mechanical Friction
Changing Locus of Rotation
Fluid Resistance
Mechanical Friction
Works through friction between two surfaces increasing during stance phase

Depends highly on body weight being applied during stance to compress a spring and bring bearing surfaces in contact or tighten a belt about a drum

Increased mechanical friction is independent of speed

eg.
Manual Locking Knee
Polycentric Knee
Weight Activated Stance Control Knee
Mechanical Device
Consists of Three knees - Manual Locking knee, Polycentric Knee & Weight Activated Stance Control Knee

Manual Locking knee requires client to unlock knee to allow flexion/extension.