Device for assisting knee joint recovery

A device for assisting knee joint recovery comprises a supporting piece and a hollow shell, the two ends of the supporting piece are each provided with an annular first connecting piece, the upper end of the shell is provided with a hook, the lower end of the shell is provided with a through hole, a spring is arranged in the shell, and the through hole is communicated with the hook. The upper end of the spring is connected with the inner wall of the upper end of the shell, the lower end of the spring is connected with the upper end of a second connecting piece, the lower end of the second connecting piece extends out of the shell through the through hole and is connected with the first connecting piece, a marker post is arranged on the second connecting piece, and an observation window is arranged on the shell in the length direction. Scales are arranged on the shell along the long edge of one side of the observation window. The knee joint flexion device has the advantages that knee joint flexion can be condu