What does the ulna bone look like?

What does ulna look like?

The body of the ulna at its upper part is prismatic in form, and curved so as to be convex behind and lateralward, its central part is straight, its lower part is rounded, smooth, and bent a little lateralward. It tapers gradually from above downward, and has three borders and three surfaces.

What does the ulna bone do?

The main function of the ulna, along with the radius, is to assist with rotation. This rotation allows for the maximal function of the wrist and hand due to the increased range of motion. The sole motion of the elbow joint is flexion and extension, otherwise known as bending and straightening the arm.

How long does a broken ulna take to heal?

A stable, simple and isolated fracture of the ulna (secondary to a direct blow) can be treated with a cast for about four to six weeks.

What is the ulna bone located?

The ulna is one of two bones that make up the forearm, the other being the radius. It forms the elbow joint with the humerus and also articulates with the radius both proximally and distally. It is located in the medial forearm when the arm is in the anatomical position.

Where is the distal ulna located?

The distal ulna has a cylindrical cross-sectional contour that articulates with a concave depression in the distal radius, the sigmoid notch, this is exactly the reverse of the arrangement at the elbow between the smaller, cylindrical radial head and the concave articular surface of the proximal ulna.

Where is the distal forearm?

The radius is one of two forearm bones and is located on the thumb side. The part of the radius connected to the wrist joint is called the distal radius. When the radius breaks near the wrist, it is called a distal radius fracture. The break usually happens due to falling on an outstretched or flexed hand.

Is it easy to break your ulna?

Because of the strong force required to break the radius or ulna in the middle of the bone, it is more common for adults to break both bones during a forearm injury.

Can you dislocate your ulna?

Elbow dislocation occurs when the humerus, ulna and radius (the elbow bones) move out of place where they meet at the elbow joint. This usually occurs when an individual breaks a fall with an outstretched hand while the arm is held straight.

Is the ulna a weight bearing bone?

The fore limb has two bones between the wrist (carpus) and the elbow joint called the radius and ulna bones. The radius is the main weight-bearing bone, the ulna bone is a minor weight-bearing bone.

What do they do for a fractured ulna?

Surgical treatment of open fractures commonly involves urgent bone realignment, wound irrigation, and the use of antibiotics to prevent infection. After surgery, the forearm is commonly put into a splint or cast for comfort and protection, and individuals will need to avoid weight bearing for six weeks.

Can a broken ulna heal on its own?

In rare cases, fractures to the forearm may heal on their own, but only if the bone has stayed in precisely the correct position for healing, and the patient does not move that arm even one millimeter during the healing process, which can take up to several months depending on the severity of the fracture.

How do you know if you broke your ulna?


  1. Severe pain, which might increase with movement.
  2. Swelling.
  3. Bruising.
  4. Deformity, such as a bent arm or wrist.
  5. Inability to turn your arm from palm up to palm down or vice versa.

How can you tell the difference between left and right ulna?

The Upper Limb, Right vs Left – YouTube

Is the ulna anterior or posterior?

From a posterior aspect, the ulna is rounded and smooth and can be palpated subcutaneously for the entire length of the antebrachial region. Just below the coronoid process at the highest point of the shaft, the ulnar tuberosity forms the muscular attachment of the brachialis muscle.

What is distal ulna?

Introduction. The distal ulna represents the fixed point around which the radius and the hand acts in daily living. The significance of distal ulnar fractures is often not appreciated and often results in inadequate treatment in comparison to its larger counterpart, the radius.

Which bone is bigger radius or ulna?

The radius is often thought of as the larger of the two long bones in the forearm because it is thicker than the ulna at the wrist, but it is thinner at the elbow. The ulna is longer than the radius by about an inch in most people, but lengths vary considerably.

What is a proximal ulna fracture?

Proximal ulna fractures is an umbrella term for a wide spectrum of injuries, ranging from simple fragility fractures to high energy complex trauma. This term includes fractures involving the ulno-trochlear joint (olecranon &amp, coronoid) and the proximal radioulnar joint (monteggia fracture-dislocation and its variants).

What is Forarm?

Introduction. The forearm of the upper extremity runs from the elbow to the wrist. Two bones, the radius laterally and the ulna medially, form the forearm. It has two compartments, the anterior (flexor) and posterior (extensor).

Why does my ulna hurt when I broke my radius?

Over time, this increased load can lead to a condition called ulnar impaction syndrome. This is one of the more common reasons patients have chronic ulnar sided wrist pain following a distal radius fracture. This occurs when the distal end of the ulna with its increased weightbearing load, wear through the TFCC.

What is the most commonly broken carpal bone?

Scaphoid fractures are by far the most common of the carpal fractures, and account for 10 percent of all hand fractures and about 55 percent of all carpal fractures [1,4-8].

What does a broken scaphoid feel like?

Symptoms. Scaphoid fractures usually cause pain and swelling in the anatomic snuffbox and on the thumb side of the wrist. The pain may be severe when you move your thumb or wrist, or when you try to pinch or grasp something. Unless your wrist is deformed, it might not be obvious that your scaphoid bone is broken.

How do I know if my elbow injury is serious?

When to Contact a Doctor for an Elbow Injury

  1. The pain is severe or continues to occur even when you aren’t using your arm.
  2. You have swelling around the elbow joint.
  3. There is redness or bruising around the elbow that doesn’t go away.
  4. You have limited mobility in the elbow or forearm.

How do you know if your arm is out of socket?


  1. A visibly deformed or out-of-place shoulder.
  2. Swelling or bruising.
  3. Intense pain.
  4. Inability to move the joint.

How do you tell if elbow is fractured or sprained?

6 Signs of an Elbow Fracture

  1. Swelling and bruising of the elbow.
  2. Extreme pain.
  3. Stiffness in and around the elbow.
  4. Snap or pop at the time of the injury.
  5. Visible deformity.
  6. Numbness or weakness in the arm, wrist and hand.

How long does a broken ulna and radius take to heal?

They take an average of 3-6 months to completely heal. By six weeks, patients are extremely comfortable and usually are released to full activities such as manual labor, skiing and motocross by three to four months.

What does it mean when your ulna hurts?

Some causes of ulnar wrist pain include: Wrist fractures. Arthritis of the joint(s) between bones. Ulnar impaction syndrome (when the ulna is longer than the radius, which can cause it to “bump into” the smaller wrist bones (Figure 2)

Why does my ulna bone hurt?

Overuse. Damaged tendons and ligaments due to repeated hand and arm motions or injuries. Triangular fibrocartilage complex (TFCC) injury. Tears or fraying in the tissues that connect the ulna to other parts of the wrist, often from a fall onto the wrist, or multiple repetitive twisting injuries.

How do you break the ulna?

How does a fracture of the radius and ulna happen? It is most commonly caused by a fall where you land on an outstretched hand. Radius and ulna can also be broken by a direct blow to the forearm.

Where is the most likely point of fracture on the ulna?

Ulnar fractures commonly occur along the proximal third of the ulna, often in association with radial injuries, as in the Monteggia pattern described later in this chapter. The coronoid process of the ulna can be fractured during a forceful landing on an outstretched arm (Figures 14-48 and 14-49).

How do I find the right ulna?


Which forearm bone is located laterally?

Anatomical terms of bone

The radius or radial bone is one of the two large bones of the forearm, the other being the ulna. It extends from the lateral side of the elbow to the thumb side of the wrist and runs parallel to the ulna.

Is this bone left or right?

Place bone superior side facing up and the medial end facing you. If the conoid turbercle ponts to the right it is a right side bone. Place rib superior side facing up with the head placed towards you. If the rib bows to the right it is a right side bone.

What is the bone that sticks out on the wrist called?

Your wrist is made up of eight small bones (carpal bones) plus two long bones in your forearm — the radius and the ulna. The most commonly injured carpal bone is the scaphoid bone, located near the base of your thumb.