What Is the Radiocarpal Joint?

Elbow joint, consisting of the distal humerus and the proximal ulnar articular surface. It consists of three joints in structure, which are enclosed in a joint capsule.

Elbow joint, consisting of the distal humerus and the proximal ulnar articular surface. It consists of three joints in structure, which are enclosed in a joint capsule.

Chinese name

Elbow joint

Foreign name

elbow joint

Number

Three joints

Function

Forward flexion and extension

Definition

Bone-to-bone indirect connection

The main structure

Articular cartilage

Elbow joint composition

1. Humeroulnar joint: A pulley joint composed of the humerus pulley and the ulna pulley cut.

2. Humeroradial joint: The ball-and-socket joint composed of the small head of the humerus and the concavity of the radial head joint should have three azimuth movements, but due to the limitation of the ulna, it cannot do adduction and abduction.

3. Proximal radioulnar joint: A cylindrical joint composed of the circular articular surface of the radius and the radial notch of the ulna.

Elbow joint structure and exercise method

The elbow joint is a typical compound joint. The joint capsule is thin and loose before and after, and the sides are tense. Strengthen the ligaments of the joint:

1. Radial collateral ligament (radial collatera llig.): Located on the outside of the elbow joint capsule, starting from the lateral epicondyle of the humerus, divided into two bundles, wrapping the radial head from front to back, and ending at the anterior and posterior edges of the ulnar radial cut.

2. Ulnar collatera llig .: From the inside of the elbow capsule, it starts from the inner epicondyle of the humerus, and the fibers are distributed in a fan shape, ending at the anterior and posterior edges of the ulnar pulley notch.

3. Radial annular ligament (annular lig of raelius): It is annular, surrounded by the anterior and posterior and lateral sides of the radial head, and attached to the anterior and posterior edges of the ulnar radial notch.

All elbow ligaments do not rest on the radius, thereby ensuring that the radius can perform internal and external rotation around the vertical axis. In terms of the overall movement of the elbow joint, there are two movement axes, that is, flexion and extension movements around the frontal axis. This movement axis is shared by the humerus-ulnar joint and the humerus-radio joint. It can be used for internal and external rotation around the vertical axis. A motion axis is common to the humerus-radio joint and the ulnar proximal joint.

Elbow- related diseases and treatment

1. The elbow joint is one of the most prone to dislocations in the human body, with an annual incidence of about 0.006% to 0.008%, of which 49% can be associated with fractures. Dislocation of elbow joint with radial head fracture and coronoid fracture is a special type of elbow joint anatomy and difficult to treat. Even with timely and effective treatment by an experienced orthopaedic clinician, the prognosis of the patient is still not ideal, so Hotchkis will This particular type of fracture injury is named "terribletriadinjury (TTI)

2. Elbow stiffness is a general term for the loss of elbow movement function for various reasons. These patients will have significant life problems. There is no standard treatment for this, but most orthopaedic surgeons recommend open elbow decompression, which is performed by releasing the contracted joint capsule, removing the heterotopic ossification, and proliferating coronary processes and osteophyte osteophytes. To restore elbow mobility.

Rehabilitation methods: The postoperative extension brace was fixed for 3 days, and drainage was removed on the 2nd day after the operation. Passive activities began on the 4th day after the operation. Only 2 days of passive flexion and extension activities were performed within 2 weeks. Usually 10 to 15 times, completed in 2 to 3 groups, each time as far as possible to achieve the maximum arc of flexion and extension of the patient, but contraindications to increase the patient's pain and fear. At night, passively move to the maximum extended position, and then fix it with the extended brace; during the day, suspend the upper limbs at 90 ° of elbow flexion. Active exercise training started after 2 weeks, but the straight brace was still used at night until 4 weeks after surgery. After 4 weeks, do daily training without resistance or gravity.