The hand navicular bone, also known as the scaphoid bone, is one of the eight small carpal bones located in the human hand. It is situated on the inner side of the wrist, between the radius bone of the forearm and the other carpal bones. The term "navicular" is derived from the Latin word "navicula," which means "little ship," describing the bone's resemblance to a boat.
The hand navicular bone is a critical component of the wrist joint, contributing to its stability and flexibility. It plays a crucial role in facilitating movements such as wrist extension, flexion, abduction, and adduction. This small bone is uniquely shaped, with a concave surface on the inner side for articulation with the radius bone and a large, somewhat rounded surface facing the palm to connect with the other carpal bones.
Due to its location and shape, the hand navicular bone is particularly susceptible to fractures, often resulting from a fall on an outstretched hand or due to direct impact in sports activities. These fractures can range from minor cracks to complete breaks, and if left untreated, they can lead to long-term complications such as wrist instability, impaired joint function, and the development of degenerative conditions like osteoarthritis.
Diagnosis of injuries to the hand navicular bone usually involves physical examination, X-rays, and sometimes additional imaging tests like CT scans or MRIs. Treatment options may include immobilization using a cast or a splint, surgery for more severe fractures, and rehabilitation exercises to restore strength, flexibility, and mobility.