Elbow instability and dislocation (Terrible triad)
What is Elbow instability and dislocation (Terrible triad)?
Elbow instability occurs when the ligaments, capsule or bony stabilisers of the elbow no longer keep the joint reliably centred. It may follow a simple elbow dislocation, repeated subluxation, ligament injury, fracture-dislocation or a complex terrible triad injury involving elbow dislocation, radial head fracture and coronoid fracture.
Common symptoms
Symptoms include pain, swelling, stiffness, apprehension, a sense of giving way, clicking, recurrent subluxation and reduced confidence when pushing, lifting, throwing or weight-bearing through the arm. Terrible triad injuries are usually more severe and may present with deformity, bruising, marked swelling and early loss of motion after trauma.
Diagnosis and imaging
Assessment includes a detailed history of the dislocation or instability episode, examination of range of motion, neurovascular status and ligament stability, and careful review for associated fractures. X-rays are essential. CT is often used after dislocation or suspected terrible triad injury to define radial head, coronoid and joint alignment. MRI may help assess ligament injury once the elbow is reduced and the bony pattern is understood.
Non-surgical treatment
Stable simple dislocations and selected ligament injuries can be treated without surgery using a short period of protection, early controlled motion and physiotherapy. The balance is important: the elbow must be protected from recurrent instability while avoiding prolonged immobilisation, which can lead to stiffness.
Surgical treatment
Surgery is considered when the elbow remains unstable, when there are displaced fractures, loose bodies, blocked motion, recurrent instability or a terrible triad pattern. Treatment may include radial head fixation or replacement, coronoid fixation, ligament repair or reconstruction and restoration of joint congruity. The aim is to create a stable elbow that can move early and heal in the correct position.
Recovery and follow-up
Recovery after elbow dislocation or instability is highly structured. Early swelling control and protected movement are followed by progressive strengthening and functional loading. Terrible triad injuries require close follow-up because stiffness, recurrent instability, nerve irritation and post-traumatic arthritis can occur even with well-planned treatment.
Elbow instability and dislocation (Terrible triad) FAQs
What is a terrible triad elbow injury?
A terrible triad injury combines elbow dislocation with fracture of the radial head and fracture of the coronoid. It is called terrible because the combination can make the elbow unstable and prone to stiffness if not managed carefully.
How is elbow instability and dislocation (terrible triad) diagnosed?
Diagnosis starts with examination and X-rays after the elbow is reduced. CT is commonly used for fracture-dislocations and terrible triad injuries because it shows the radial head, coronoid and joint alignment in detail.
Can an elbow dislocation heal without surgery?
Yes, many simple elbow dislocations can heal without surgery if the joint is stable after reduction and there are no major associated fractures. Complex dislocations and terrible triad patterns often need surgical assessment.
Will I need surgery for elbow instability and dislocation (terrible triad)?
Surgery is considered when the elbow is unstable, when fractures compromise stability or motion, or when the injury pattern is unlikely to remain reduced with bracing and therapy alone.
When can I return to throwing, contact sport or heavy loading?
Return depends on the injury pattern, stability, fracture healing, motion and strength. Simple dislocations recover faster than terrible triad injuries, but unrestricted loading should wait until the elbow is stable, mobile and strong.
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