Product Overview
Model 2009 is a non-protrusion knee joint that combines the simplicity and security of a standard drop lock with automatic locking. When the joints reach full extension the rings are automatically engaged by springs that are internally housed with the midsections. This feature gives the user the convenience of automatic locking.
(https://www.beckerorthopedic.com/Product/KneeJoints/2000KneeSeries/2009)
