What is the typical range for extension at the glenohumeral joint?

The typical range for extension at the glenohumeral joint is indeed around 50 to 70 degrees. This range is crucial for various activities and movements that involve the arm and shoulder, such as reaching backward or performing certain athletic actions.

Understanding that the glenohumeral joint, which is a ball-and-socket joint, allows for a wide range of motion is key. The degrees of extension reflect the anatomical limits of this joint, influenced by factors such as the structure of the joint, the surrounding muscles, and the capsule and ligaments.

Extension occurs when the arm moves backward relative to the body, and reaching the upper limit of this range can involve balancing flexibility with stability to prevent injury. By recognizing the normal range, practitioners can better assess joint function and design appropriate rehabilitation or training programs.

Other ranges provided do not align with the typical anatomical parameters established in human physiology literature; thus, they wouldn't accurately represent the normal anatomical movement at this joint.