What is wrist instability and ligament injuries?
The wrist is a complex and highly mobile joint composed of eight small carpal bones arranged in two rows, connecting the hand to the forearm. Stability of this joint is maintained by a network of strong ligaments that link the carpal bones to each other and to the radius and ulna. These ligaments ensure that the bones move in a coordinated manner, allowing smooth, controlled motion while maintaining structural integrity.
Wrist instability occurs when one or more of these ligaments are stretched, partially torn, or completely ruptured. This can lead to abnormal movement between the carpal bones, disrupting normal wrist mechanics. Over time, untreated instability may result in progressive cartilage wear, altered joint loading, and the development of degenerative arthritis. Certain ligament injuries—such as those involving the scapholunate or lunotriquetral ligaments—are particularly important because they play a central role in maintaining carpal alignment.
Causes
Ligament injuries of the wrist most commonly occur as a result of trauma. A frequent mechanism is a fall onto an outstretched hand, which places excessive force through the wrist and can overstretch or tear the supporting ligaments. These injuries are also commonly seen in sporting activities, especially those involving high impact, repetitive loading, or sudden twisting motions of the wrist, such as gymnastics, contact sports, and racquet sports.
In addition to acute trauma, ligament injuries may develop gradually due to repetitive strain or chronic overuse. In some cases, a seemingly minor sprain may mask a more significant ligament injury, which, if left untreated, can lead to persistent instability and long-term complications.
Symptoms
Symptoms can vary depending on the severity and specific ligaments involved, but commonly include:
- Pain in the wrist, often localised to a specific area and aggravated by movement or weight-bearing
- A sensation of weakness or reduced grip strength
- Clicking, clunking, or popping sensations during wrist motion
- A feeling of instability or that the wrist may “give way” during use
- Swelling or tenderness over the affected ligaments
- Reduced range of motion or discomfort at the extremes of movement
In some cases, symptoms may initially be mild and mistaken for a simple sprain, but can persist or worsen over time if instability is present.
Diagnosis
Diagnosis requires a careful and systematic clinical assessment. A detailed history is taken to understand the mechanism of injury, symptom progression, and any prior wrist problems.
On physical examination, the clinician will assess for tenderness, swelling, range of motion, and grip strength. Specialised tests are often performed to evaluate the integrity of specific ligaments, such as stress manoeuvres designed to detect abnormal movement between carpal bones. These tests may reproduce pain or reveal mechanical instability. Because some ligament injuries can be subtle or difficult to detect, particularly in the early stages, a high level of clinical suspicion is often required.
Imaging
Imaging studies are important in confirming the diagnosis and assessing the extent of injury. X-rays are typically the first-line investigation and may reveal abnormal spacing or alignment of the carpal bones. Stress views can sometimes highlight dynamic instability not seen on standard images. MRI scans provide detailed evaluation of soft tissues, including ligaments, cartilage, and surrounding structures, and can help identify partial or complete tears. CT scans may be used in certain cases to better assess bone alignment or associated fractures. Diagnostic wrist arthroscopy is considered the gold standard for evaluating many ligament injuries, as it allows direct visualisation of the internal structures of the wrist and can also be used for treatment.
Treatment
Conservative (Non-operative)
Treatment depends on the severity of the injury, the degree of instability, and the patient’s functional requirements. For mild to moderate injuries, initial management is usually non-surgical and may include splinting or bracing to immobilise the wrist, promote ligament healing, and reduce pain. Activity modification is often recommended to avoid movements or tasks that exacerbate symptoms, while physiotherapy plays an important role through a structured rehabilitation program aimed at restoring strength, flexibility, and joint stability. Nonsteroidal anti-inflammatory drugs (NSAIDs) may also be used to help relieve pain and inflammation. Early treatment is important to prevent progression to chronic instability.
Surgical treatment
Surgical intervention may be required in more severe cases, particularly when there is a complete ligament rupture, persistent symptoms despite conservative management, or evidence of ongoing instability. The choice of procedure depends on the type and chronicity of the injury. Surgical options may include ligament repair, which involves reattaching the torn ligament and is typically performed in acute injuries, or ligament reconstruction using tendon grafts to recreate the damaged ligament in chronic cases. Temporary stabilisation with pins or fixation devices may also be used to maintain proper alignment of the carpal bones during healing. In advanced cases associated with secondary arthritis, salvage procedures such as partial wrist fusion may be considered.
Recovery
Following surgery, patients usually require a period of immobilisation followed by a guided rehabilitation program to restore motion, strength, and function. Outcomes are generally favourable when instability is recognised early and managed appropriately.