Features: The 626N limited position drop ring knee joint adjustable hinge adopts a stainless steel protective plate drop ring locking structure, which also has the function of drop ring locking. After unlocking, the joint can be bent and adjusted in units of 21 degrees, with an adjustment range of 0-105 degrees, allowing for free flexion and extension within the bending limit range. The upper and lower support bars are made of stainless steel material. Purpose: Used for assembling lower limb orthotics for cerebral palsy patients, controlling abnormal movement of knee joint inversion and eversion, and controlling flexion deformities; Control the range of flexion and extension of the knee joint. Improve the support stability of the knee joint.