**Question:** Stability of ankle joint is maintained by the following except

A. Ankle joint cartilage
B. Ankle joint ligaments
C. Ankle joint muscles
D. Ankle joint capsule

**Core Concept:** Ankle joint is a synovial joint that plays a crucial role in maintaining our ability to walk and perform various activities of daily living. The stability of an ankle joint is essential for its proper function and prevention of injury. The primary structures responsible for maintaining joint stability include joint cartilage, ligaments, muscles, and the joint capsule.

**Why the Correct Answer is Right:** Ankle joint cartilage (option A) is present on the articulating surfaces of the bones but not involved in providing stability directly. Although it reduces friction and absorbs shock, its primary function is to facilitate smooth movement of the bones within the joint.

**Why Each Wrong Option is Incorrect:** Ligaments (option B) are the key structures responsible for maintaining joint stability by connecting the bones and restricting excessive movement. Muscles (option C) provide dynamic stability by contracting around the joint and stabilizing it during movement. The joint capsule (option D) is a thin layer of fibrous tissue surrounding the joint, providing a protective barrier while contributing to joint stability through its structure and tension.

**Clinical Pearl / High-Yield Fact:** The correct answer (option A) indicates that cartilage is essential for smooth joint movement but not for stability. This is crucial for students to understand the specific roles of each joint structure, which can help them identify potential complications when these structures are damaged or diseased, such as in osteoarthritis or ligament injuries.

**Correct Answer:** D. Ankle joint capsule