Novel Locking Total Knee Replacement Design for Treatment of Knee Extensor Weakness


Reference #:  01007

The University of South Carolina is offering licensing opportunities for novel knee implants that allow the user to flex the implant using manual and magnetic features, thereby increasing mobility and reducing fatigue.

Invention Description:

The subject invention is a lockable knee implant. It allows for knee flexion when desired by the user and also locks into a fixed or semi-rigid configuration for structurally stable stance or walking, similar to an arthrodesis or still gait. The device is a variation of a stabilized total knee replacement used for reconstructive surgery based on hinged knee designs but incorporates fully novel features.

Potential Applications:

Knee replacement or implants; alternative to knee arthrodesis.

Advantages and Benefits:

1.    Knee implants can be selectively locked and unlocked by the user

2.    Can be self-locked by applying a defined force or load

3.    Can be magnetically and/or manually operated

4.    Robust enough to resist bending at physiologically relevant loads while able to be flexed as desired or necessary

5.    Reduces moment arm of leg when sitting or lying, increases mobility, and eliminates pain secondary to knee fusion


Knee arthrodesis is a typical procedure that results in an extended lower limb that cannot be flexed or reduced in length. This extended position requires great muscular strength and endurance, both moving and not moving, which can lead to secondary joint pain and muscular fatigue. It can also inhibit normal daily activities such as bathing, tying shoes, or sitting in close quarters. Total knee replacement, while a more drastic procedure, is also common. However, if the primary treatment fails, a revision procedure is required. With each new surgery more native anatomy is lost and the risk of secondary damage to musculature, nerves, and bone increases. Multiple surgical interventions can compound these risks and complications and lead to terminal knee dysfunction.

Patent Information:
For Information, Contact:
Technology Commercialization
University of South Carolina
Frank Voss
Eric Lucas
John DesJardins
Kim Chillag
© 2024. All Rights Reserved. Powered by Inteum