What type of joint is affected by a dislocated humeral head?

The shoulder joint is the correct answer because it is the specific joint that involves the humeral head, which is the rounded end of the humerus bone that fits into the shallow cavity of the shoulder blade (scapula) known as the glenoid. A dislocation of the humeral head occurs when it is forced out of the glenoid cavity, resulting in injury to the shoulder joint. This type of dislocation is most commonly an anterior dislocation, often caused by trauma or extreme arm movements.

Understanding the structure of the shoulder helps clarify why other joints are not involved. The knee, elbow, and ankle joints do not incorporate the humerus in their structure. The knee is primarily composed of the femur and tibia, the elbow joint consists of the humerus, radius, and ulna, but it deals with dislocations related to the forearm rather than the shoulder, and the ankle joint is related to the bones of the leg and foot. Therefore, only the shoulder joint is directly affected by a dislocated humeral head.