Stewie had minor surgery

[Geew1992]

 

[Ironman23]

The meniscus is a C-shaped cartilage that acts as a shock absorber and stabilizer within the knee joint, situated between the femur (thigh bone) and tibia (shinbone). Each knee has two menisci: the medial meniscus (inside) and the lateral meniscus (outside).

 

[MilfordHusky]

Best wishes to Stewie!