Ulnar bone fracture overview

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Mohammadmain Rezazadehsaatlou[2] ;

Overview

The forearm comprises of 2 long bones: radius and the ulna; ulna forms joints with the humerus. The ulnar fracture is caused by the break in the ulna due to form trauma. An ulna as one of the long bones of the forearm is located in in human upper limb and its fracture is a relatively common condition. Forearm bones can fracture in different ways: they can fracture into multiple fragments or may just develop a hairline fracture. These broken pieces my line up straight or be in a different location.

Type

• Nightstick fracture: fracture of the middle portion of the ulna without other fractures.
• Hume fracture: fracture of the olecranon with an associated anterior dislocation of the radial head
• Distal ulna fractures: fracture occur along with distal radius fractures.
• Monteggia fracture: fracture of the proximal third of the ulna with the dislocation of the head of the radius

Epidemiology and demographics

According to data from the 2010 National Electronic Injury Surveillance System (NEISS) database and the 2010 US Census, the forearm fractures accounted for 17.8% of all fractures and were the most common type of fracture in the pediatric population (With the range of 0-19 years). National Hospital Ambulatory Medical Care Survey showed that fractures of the radius, the ulna, or both accounted for 44% of all forearm and hand fractures in the United States. The fracture of ulna usually occurs in combination with other injuries such as a sprained or dislocated wrist or elbow, a fractured radius, or other fractures of the hand, wrist or forearm. Based on the affected area during the trauma the severity and type of injuries varies from avulsion fracture, stress fracture, medial epicondyle fracture, olecranon fracture, displaced fracture, un-displaced fracture to the greenstick, comminuted.

Cause

• Direct blow
• road / traffic accidents
• contact sports
• Falling

Sign and Symptoms

• Pain
• Swelling
• Bruising
• Inability to rotate arm
• Numbness in the fingers or wrist
• weakness in the fingers or wrist

Diagnosis

• Physical Exam Main step
• X-ray is required to confirm diagnosis
• MRI, CT scan or bone scan for further investigations

Treatment

• Nonsurgical Treatment
  • Cast
  • Brace

• Surgical Treatment
  • Open reduction and internal fixation with plates and screws.
  • Open reduction and internal fixation with rods
  • External fixation

Prognosis

Using appropriate management such as surgical or conservative treatments for the fractured ulna usually make a full recovery. One of the most important components for recovery is that the patient rests sufficiently. Evaluation of the fracture with follow up X-rays is important to ensure the fracture is healing in an ideal position. Getting back to activity or sport can be found in weeks to months but in patients with severe injuries involving other bones, soft tissue, nerves or blood vessels, recovery time may be somehow prolonged; meanwhile it should be guided by the orthopedic surgeon and treating physiotherapist.

Physiotherapy involving ulna bone<ref name="pmid27707565">Casagrande DJ, Morris RP, Carayannopoulos NL, Buford WL (December 2016). "Relationship Between Ulnar Variance, Cortical Bone Density, and Load to Failure in the Distal Radius at the Typical Site of Fracture Initiation". J Hand Surg Am. 41 (12): e461–e468. doi:10.1016/j.jhsa.2016.08.021. PMID 27707565.</ref:

• Soft tissue massage
• Joint mobilization
• Electrotherapy (e.g. ultrasound)
• Taping or bracing
• Exercises to improve strength and flexibility
• Activity modification

Based on the orthopedic surgeons opinion many types of medicines are available to help manage pain, including opioids, non-steroidal anti-inflammatory drugs (NSAIDs), and local anesthetics.

External link

The American Orthopaedic Association

American Academy of Orthopedic Surgeons