What surgery is most difficult total knee replacement or shoulder?

Total knee replacement is generally considered more complex than shoulder surgery due to the intricacies of knee anatomy, the need for precise alignment, and the weight-bearing nature of the knee joint. The procedure involves extensive soft tissue manipulation and can have a longer recovery period. In contrast, shoulder surgeries, while also challenging, often involve less bone and soft tissue disruption. Ultimately, the difficulty can vary based on the surgeon's experience and the specific case at hand.