Wrist Ligament Injuries: Diagnosis and Management

Wrist ligament injuries are common, often resulting from falls, sports injuries, or repetitive strain. These injuries can range from minor sprains to complete ligament tears, leading to pain, instability, and impaired wrist function. This article provides a comprehensive overview of the diagnosis and management of wrist ligament injuries, with a focus on two specific conditions: scapholunate dissociation and lunotriquetral instability.

Anatomy and Function

The wrist is a complex joint comprising eight small carpal bones, two long forearm bones (radius and ulna), and an intricate network of ligaments¹. Ligaments are strong, fibrous tissues that connect bones and provide stability to the joint. The ligaments of the wrist are crucial for coordinated movement and force transmission, enabling activities such as gripping, lifting, and rotating the hand.

Types of Wrist Ligament Injuries

Wrist injuries can involve various structures, including ligaments, bones, and tendons². Ligament injuries, commonly known as sprains, are classified into three grades based on the severity of the damage: ³

1. Grade 1: Mild sprain with stretching of the ligaments and microscopic tears.
2. Grade 2: Moderate sprain with partial tearing of the ligaments.
3. Grade 3: Severe sprain with complete tear of the ligament or avulsion fracture (where the ligament tears away from the bone, taking a small bone fragment with it)⁴.
4. Dislocation: This occurs when a bone slips out of its normal position in the joint, potentially damaging muscles, ligaments, and the joint capsule².
5. Bone fracture: Several bones in the wrist can break, including the radius, ulna, carpal bones (e.g., scaphoid and lunate), or metacarpal bones. Fractures can also damage ligaments, nerves, and other joint structures².

Causes

The most common cause of wrist ligament injuries is a fall onto an outstretched hand, which can overstretch or tear the ligaments³. This mechanism is often responsible for scapholunate dissociation and lunotriquetral instability, as discussed later in this article. Other causes of wrist ligament injuries include:

1. Sudden twists or bends of the wrist ³
2. Extreme pressure on the wrist ³
3. Sports injuries, particularly those involving high-impact or repetitive motions ⁵
4. Certain medical conditions, such as infections and rheumatoid arthritis, which can weaken ligaments and increase the risk of injury ⁵

Symptoms

Symptoms of wrist ligament injuries vary depending on the severity of the injury. Common symptoms include: ⁶

1. Pain and swelling in the wrist
2. Limited range of motion
3. Tenderness to the touch
4. A feeling of popping or tearing inside the wrist
5. Warmth around the wrist
6. Bruising
7. Instability of the wrist

Diagnosis

Diagnosing a wrist ligament injury involves a thorough physical examination, medical history, and imaging tests.

Physical Examination

The doctor will examine the wrist for tenderness, swelling, and range of motion. They may also perform specific tests to assess ligament stability, such as: ⁷

1. Scaphoid shift test: This test involves the doctor grasping and firmly pushing the scaphoid bone to check its stability.
2. Ballottement test: This test checks for the stability of the lunotriquetral ligament by stabilizing the lunate bone and assessing for pain, grinding sounds, and/or excessive mobility of the lunotriquetral joint.
3. Grip strength measurement: The patient’s grip strength is measured using a device called a Jamar dynamometer.

Medical History

The doctor will inquire about the mechanism of injury, previous wrist injuries, and any other symptoms. This information helps to guide the diagnostic process and determine the appropriate treatment plan.

Imaging Tests

Several imaging techniques are used to diagnose wrist ligament injuries. The choice of imaging modality depends on the suspected injury and the need for specific information⁷.

| Imaging Technique | Description |

Works cited

1. Wrist Injuries and Conditions – Tamara John, MD, accessed February 17, 2025, https://www.tjohnhand.com/wrist-injuries-and-conditions-hand-upper-extremity-surgery-tamarac-fort-lauderdale-fl/

2. Overview: Wrist injuries – InformedHealth.org – NCBI Bookshelf, accessed February 17, 2025, https://www.ncbi.nlm.nih.gov/books/NBK563103/

3. Wrist Ligament Tear Madison, WI | Wrist Ligament instability …, accessed February 17, 2025, https://www.orthowisconsin.com/wrist-ligament-tear-instability-orthopaedic-surgeon-wisconsin.html

4. Wrist Ligament Injuries: Symptoms, Diagnosis & Treatment | Portland Urgent Care, accessed February 17, 2025, https://www.portlandurgentcare.com/blog/wrist-ligament-injuries

5. Wrist Sprains: Symptoms, Causes & Treatment – Cleveland Clinic, accessed February 17, 2025, https://my.clevelandclinic.org/health/diseases/24558-sprained-wrist

6. Wrist Sprains – OrthoInfo – AAOS, accessed February 17, 2025, https://orthoinfo.aaos.org/en/diseases–conditions/wrist-sprains/

7. Diagnosis of Wrist Sprain | Sports-health, accessed February 17, 2025, https://www.sports-health.com/sports-injuries/hand-and-wrist-injuries/diagnosis-wrist-sprain