Introduction

Tenosynovitis is an inflammatory condition affecting the synovial sheath that surrounds your tendons, which are the fibrous cords connecting muscles to bones. This inflammation can lead to pain, swelling, and difficulty moving the affected joint. Commonly impacted areas include the hands, wrists, and feet. The condition can be caused by repetitive movements, overuse, injury, or underlying health issues such as diabetes or rheumatoid arthritis. Infectious tenosynovitis occurs when the sheath becomes infected, often due to a puncture wound introducing bacteria. Treatment typically involves rest, immobilisation, anti-inflammatory medications, and in cases of infection, appropriate antibiotics.¹

Types of tenosynovitis

Infectious (Septic) tenosynovitis

Infectious (septic) tenosynovitis is a serious infection that affects the protective covering around a tendon, most commonly in the fingers, hand, or wrist. It usually happens when bacteria enter through a cut, puncture wound, bite (from an animal or human), or from intravenous drug use. The most common bacteria causing this infection are  Streptococcus species (Staphylococcus aureus), and in the case of animal bites, Pasteurella multocida. People with this condition may have four key symptoms, known as Kanavel's signs: pain along the affected tendon, swelling that makes the finger look sausage-shaped, difficulty straightening the finger, and holding the finger slightly bent because of discomfort. Doctors diagnose it through a physical examination and sometimes imaging tests. Treatment must begin quickly, usually with intravenous antibiotics and often surgery to drain the infection. If left untreated, it can lead to serious problems like tendon damage, permanent stiffness, or even amputation.⁴

Non-infectious (aseptic) tenosynovitis

Non-infectious (aseptic) tenosynovitis refers to inflammation of the tendon sheath without bacterial or fungal infection. It is usually caused by repetitive strain, overuse, trauma, autoimmune conditions, or metabolic disorders. ⁵

Non-Infectious (Aseptic) Tenosynovitis are of different types:

•  De quervain’s tenosynovitis

 De Quervain's tenosynovitis is a painful condition affecting the tendons on the thumb side of the wrist. It occurs when the two tendons around the base of your thumb become swollen, causing the sheaths (casings) covering the tendons to become inflamed. This swelling can lead to pain and tenderness along the thumb side of the wrist, especially when forming a fist, grasping, or turning the wrist. The exact cause is often linked to repetitive hand or wrist movements, and is more common in women. Treatment typically involves immobilising the thumb and wrist, administering medications to reduce pain and swelling, and in so cases, corticosteroid injections or surgery. ⁶

•  Stenosing tenosynovitis (Trigger Finger)

Stenosing tenosynovitis, commonly known as trigger finger, is a condition where the tendons that control finger movement become irritated and inflamed, leading to difficulty in moving the finger. This condition is characterised by pain, swelling, and a catching or locking sensation when trying to straighten the affected finger. It occurs due to the thickening of the tendon sheath, which restricts the smooth movement of the tendon through the sheath, causing the finger to become stuck in a bent position. The condition is often seen in individuals who perform repetitive hand movements or have certain health conditions like diabetes or rheumatoid arthritis. Treatment options include rest, anti-inflammatory medications, steroid injections, or, in severe cases, surgery.⁷

•  Flexor and extensor tenosynovitis 

This tenosynovitis is the inflammation of the synovial sheath surrounding tendons, particularly affecting the flexor and extensor tendons responsible for bending and straightening joints. This condition arises from repetitive use injuries or chronic systemic diseases such as rheumatoid arthritis, diabetes, or gout. Symptoms include pain along the tendon, swelling, and difficulty moving the affected area. Management typically involves rest, immobilisation, nonsteroidal anti-inflammatory drugs (NSAIDs), and corticosteroid injections. In cases where conservative treatments are ineffective, surgical intervention might be considered.⁸

•  Chronic Tenosynovitis

Chronic non-infectious (aseptic) tenosynovitis is a persistent inflammation of a tendon and its surrounding synovial sheath, commonly resulting from repetitive use injuries or chronic inflammatory conditions such as rheumatoid arthritis or gout. This condition often manifests as pain, swelling, and difficulty moving the affected tendon, with the hands and wrists being particularly susceptible. Over time, if left untreated, it can lead to complications like stenosing tenosynovitis, where the tendon sheath narrows, causing restricted movement and potential deformities. Management typically involves rest, immobilisation, nonsteroidal anti-inflammatory drugs (NSAIDs), and physical therapy to reduce inflammation and restore function. In cases where conservative treatments are ineffective, corticosteroid injections or surgical intervention may be considered to alleviate symptoms and prevent further complications.⁵

Prevention and lifestyle modifications

Tenosynovitis, the inflammation of the sheath surrounding a tendon, can be effectively prevented and managed through specific lifestyle modifications:

Proper ergonomics and avoiding repetitive stress 

Implementing ergonomic principles in daily activities is crucial to prevent tenosynovitis. Ensuring that work stations are designed to promote natural body alignments can significantly reduce repetitive stress on muscles and tendons. For instance, adjusting the height of your chair and desk to maintain neutral wrist positions while typing can minimise strain. Additionally, using ergonomic tools like adjustable laptop stands and desk edge cushions can help maintain proper posture and reduce pressure on the wrists and forearms. Taking regular breaks to stretch and relax muscles during repetitive tasks further aids in preventing overuse injuries. ⁹

Strengthening and stretching exercises

Regularly performing strengthening and stretching exercises enhances the flexibility and resilience of tendons, thereby reducing the risk of tenosynovitis. Exercises such as wrist flexion and extension can improve the stability and function of the affected tendons and muscles. Incorporating low-impact activities like walking, swimming, or cycling can also be beneficial, as they promote overall joint health without placing excessive strain on specific tendons. It's important to perform these exercises correctly and consistently to achieve optimal results.¹⁰

Managing underlying conditions (diabetes, arthritis)

Effectively managing underlying health conditions is essential in preventing tenosynovitis. For individuals with diabetes, maintaining blood sugar levels through a balanced diet, regular exercise, and appropriate medication can prevent tendon damage associated with the condition. Similarly, managing arthritis through prescribed treatments and lifestyle modifications can reduce joint inflammation and the subsequent risk of tendon sheath inflammation. Engaging in regular physical activity, maintaining a healthy weight, and following medical advice are critical components of managing these conditions and preventing complications like tenosynovitis.¹¹

Summary

Tenosynovitis is an inflammatory condition affecting the synovial sheath around tendons, leading to pain, swelling, and restricted movement. It can be classified as infectious (septic) or non-infectious (aseptic), with subtypes such as de Quervain’s tenosynovitis, trigger finger, flexor and extensor tenosynovitis, and chronic tenosynovitis. Understanding these types is essential for accurate diagnosis and effective treatment, which may involve rest, anti-inflammatory medications, corticosteroid injections, or surgery in severe cases. Early intervention can prevent complications like chronic pain and joint stiffness. Preventive measures, including ergonomic adjustments, strengthening exercises, and managing conditions like diabetes or arthritis, play a key role in reducing the risk of tenosynovitis and maintaining overall tendon health.