Acromioclavicular Joint Injury Treatment In Singapore

Shoulder pain from an acromioclavicular (AC) joint injury can significantly impact your daily activities, from reaching overhead to carrying groceries or participating in sports. Whether you’ve experienced a recent fall, sports collision, or are dealing with persistent shoulder discomfort, understanding your AC joint injury is the first step toward recovery. Our Senior Consultant Orthopaedic Surgeon specialises in diagnosing and treating AC joint injuries, offering comprehensive care tailored to your specific needs and activity level. With proper assessment and treatment, most patients can return to their normal activities and regain full shoulder function.

Dr Zackary Chua

Senior Consultant Orthopaedic Surgeon (Adult & Paeds)

MBBS (Aus)MMed (SG)MRCS (Glasgow)FRCSEd (Orth)

Types Causes & Risks Symptoms When to see a Doctor Diagnosis Treatment Complications Prevention FAQ Conclusion

What is an Acromioclavicular (AC) Joint Injury?

An AC joint injury involves damage to the joint where your collarbone (clavicle) meets the highest point of your shoulder blade (acromion). This small but crucial joint is stabilised by ligaments and plays an essential role in overhead arm movements and shoulder stability. AC joint injuries range from minor sprains to complete ligament tears with joint separation. In Singapore, these injuries commonly occur in contact sports like rugby and football, as well as from falls during cycling or other activities. The severity of injury determines both the symptoms experienced and the treatment approach required.

Types of AC Joint Injuries

AC joint injuries are classified into six grades based on the extent of ligament damage and joint displacement:

Grade I – Mild Sprain

Grade I injuries involve minor stretching or partial tearing of the AC ligaments without any visible deformity. The joint remains stable, though patients experience pain and tenderness directly over the AC joint.

Grade II – Moderate Sprain

Grade II injuries feature partial tearing of the AC ligaments with slight widening of the joint space. There may be minimal elevation of the clavicle, but the joint remains relatively stable.

Grade III – Complete AC Ligament Tear

Grade III injuries involve complete tearing of the AC ligaments with noticeable elevation of the clavicle. The shoulder appears visibly deformed with a prominent bump where the collarbone sits higher than usual.

Grade IV-VI – Severe Separations

These higher-grade injuries involve additional damage to surrounding structures. Grade IV injuries show posterior displacement of the clavicle, Grade V demonstrates severe superior displacement, and Grade VI involves inferior displacement beneath the coracoid process. These severe injuries are less common but require specialised treatment.

Causes

The most common causes of AC joint injuries include:

Direct trauma from falling onto the shoulder
Sports collisions, particularly in rugby, football, and hockey
Motor vehicle accidents with side impact
Falls from bicycles or motorcycles
Work-related accidents involving falls from height

Risk Factors

Several factors increase the likelihood of sustaining an AC joint injury:

Participation in contact sports or high-impact activities
Previous shoulder injuries or instability
Poor shoulder muscle strength and conditioning
Inadequate protective equipment during sports
Age-related degenerative changes in the joint
Occupations involving overhead work or risk of falls

Signs & Symptoms

Acute Injury Symptoms

Immediate pain at the top of the shoulder
Visible deformity or bump above the shoulder
Swelling and bruising around the AC joint
Difficulty lifting the arm overhead
Pain when lying on the affected side
Grinding or popping sensation with movement

Chronic Symptoms (Untreated Injuries)

Persistent shoulder pain during activities
Weakness with overhead movements
Clicking or catching sensation in the shoulder
Development of arthritis in the AC joint
Muscle fatigue from compensatory movements
Limited range of motion

Associated Symptoms

Pain radiating into the neck or upper arm
Muscle spasms around the shoulder blade
Difficulty with cross-body movements
Discomfort when wearing backpacks or shoulder bags

The severity of symptoms typically correlates with the grade of injury, with higher-grade separations causing more pronounced pain and dysfunction. Some patients may experience increased symptoms with weather changes or after prolonged activity.

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When to See a Doctor

Seek immediate medical attention if you experience sudden shoulder pain after a fall or collision, especially if accompanied by visible deformity or inability to move your arm. Even seemingly minor shoulder injuries warrant professional evaluation, as early treatment often leads to positive outcomes. You should also consult a shoulder specialist in Singapore if you have persistent shoulder pain lasting more than a few days, difficulty with daily activities like dressing or reaching, or if conservative measures haven’t provided relief.

During your consultation, our specialist will perform a thorough examination, review your injury mechanism, and determine the appropriate imaging studies needed. Early intervention can prevent chronic problems and help you return to activities sooner. For high-grade injuries, prompt surgical evaluation may be necessary to achieve good results.

Diagnosis & Testing Methods

Accurate diagnosis begins with a detailed history and physical examination. Our orthopaedic surgeon will assess the mechanism of injury, examine your shoulder for deformity, and perform specific tests to evaluate AC joint stability. The cross-body adduction test, where your arm is moved across your body, often reproduces pain in AC joint injuries.

Standard X-rays remain the primary imaging tool, including anteroposterior, lateral, and specialised views to assess joint separation. Weighted stress views, where you hold weights during X-rays, can help differentiate between grade II and III injuries. MRI scanning may be recommended for complex cases to evaluate associated soft tissue injuries, including rotator cuff tears or labral damage. Ultrasound examination can provide a dynamic assessment of joint stability and is useful for comparing the injured and uninjured sides.

Treatment Options Overview

Conservative Management

Most Grade I and II injuries respond well to non-surgical treatment. This includes rest, ice application, and activity modification during the acute phase. A supportive sling provides comfort and protects the joint during initial healing.

Physiotherapy

Structured rehabilitation forms the cornerstone of treatment for most AC joint injuries. Early range-of-motion exercises prevent stiffness while protecting healing tissues. Progressive strengthening focuses on the deltoid, trapezius, and rotator cuff muscles to provide dynamic stability.

Injection Therapies

Corticosteroid injections into the AC joint can provide significant pain relief for persistent symptoms. These injections reduce inflammation and may be helpful for patients with post-traumatic arthritis. Platelet-rich plasma (PRP) injections offer an alternative for promoting tissue healing.

Surgical Stabilisation

Surgery is typically reserved for high-grade injuries (IV-VI) or failed conservative treatment of grade III separations in active individuals. Current techniques include anatomic ligament reconstruction using grafts to restore normal joint relationships. Arthroscopic-assisted procedures allow minimally invasive stabilisation with smaller incisions.

Surgical Techniques

Various surgical options exist depending on injury chronicity and patient factors. Acute injuries may be treated with direct ligament repair and temporary fixation. Chronic cases often require ligament reconstruction using tendon grafts to recreate the damaged structures. Some techniques utilise synthetic materials or suture devices for stabilisation.

Post-Surgical Rehabilitation

Following surgery, a structured rehabilitation programme is essential. Initial immobilisation protects the repair while early passive motion prevents stiffness. Progressive strengthening begins around 6-8 weeks, with return to sports typically occurring at 4-6 months, depending on the procedure performed.

Every patient’s condition is unique.

Our Senior Consultant Orthopaedic Surgeon will assess your specific situation and recommend the most suitable treatment approach for you.

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Complications if Left Untreated

Untreated AC joint injuries can lead to chronic shoulder dysfunction and persistent pain. The altered shoulder mechanics from an unstable AC joint place increased stress on surrounding structures, potentially causing secondary problems like rotator cuff tendinitis or impingement syndrome. Many patients develop compensatory movement patterns that lead to neck pain and muscle imbalances.

Post-traumatic arthritis commonly develops in the AC joint following injury, causing progressive pain and stiffness. This degenerative process can significantly impact quality of life, limiting work capacity and recreational activities. High-grade separations left untreated may result in permanent deformity and weakness, particularly affecting overhead activities and heavy lifting. Some patients experience ongoing discomfort from the prominent clavicle rubbing against clothing or backpack straps.

Prevention

While not all AC joint injuries can be prevented, several strategies can reduce your risk. Proper conditioning and strength training of the shoulder muscles provide dynamic stability and protection during falls. Athletes should use appropriate protective equipment and practise proper falling techniques to minimise direct shoulder impact.

For cyclists and motorcyclists in Singapore, wearing properly fitted protective gear and maintaining awareness of road conditions helps prevent falls. Workplace safety measures, including proper ladder use and fall protection equipment, are essential for those in high-risk occupations. Regular shoulder strengthening exercises, focusing on the rotator cuff and scapular stabilisers, enhance joint protection. Maintaining flexibility through stretching prevents muscle imbalances that could increase injury susceptibility.

Acromioclavicular Joint Injury

Frequently Asked Questions

How long does it take for an AC joint injury to heal?

Healing time varies by injury grade. Grade I injuries typically heal within 2-3 weeks with conservative treatment. Grade II injuries may require 4-6 weeks of recovery. Grade III injuries can take 8-12 weeks for full healing, while surgical cases require 4-6 months before returning to full activities. Individual factors like age, overall health, and adherence to rehabilitation affect recovery timelines.

Can I return to sports after an AC joint injury?

Most patients successfully return to sports following appropriate treatment. Grade I-II injuries often allow return to play within 2-6 weeks. Grade III injuries may require 2-3 months before sports resumption. After surgery, return to contact sports typically occurs at 4-6 months. Our orthopaedic surgeon will guide your return based on healing progress and functional recovery.

Will I need surgery for my AC joint separation?

Surgery is not required for most AC joint injuries. Grade I-II injuries almost always heal with conservative treatment. Grade III injuries may be treated non-surgically in many cases, though active individuals or manual labourers might benefit from surgical stabilisation. Grade IV-VI injuries typically require surgery for good outcomes. The decision depends on injury severity, activity level, and response to initial treatment.

What activities should I avoid with an AC joint injury?

During acute healing, avoid overhead activities, heavy lifting, and movements that stress the shoulder. Sleeping on the affected side should be avoided initially. Cross-body reaching and pushing/pulling movements may aggravate symptoms. As healing progresses, activities are gradually reintroduced based on pain levels and functional improvement. Your physiotherapist will provide specific guidance on activity progression.

Can AC joint injuries cause long-term problems?

With appropriate treatment, most patients will be able to regain their mobility with little or no pain at all. Some individuals develop post-traumatic arthritis years after injury, particularly with high-grade separations. Persistent symptoms may occur if initial treatment is inadequate or rehabilitation is incomplete. Regular follow-up and maintenance exercises help minimise long-term complications.

How do I know if my AC joint injury is severe?

Severe injuries typically present with obvious deformity, significant pain, and inability to lift the arm. A visible step-off or bump at the shoulder, extensive swelling, and complete loss of overhead function suggest a high-grade separation. Any injury with these features requires immediate medical evaluation. Our orthopaedic surgeon can accurately assess severity through examination and imaging.

Conclusion

Acromioclavicular joint injuries, while painful and limiting, can be effectively treated with appropriate medical care. Understanding your injury grade and following a structured treatment plan are essential for recovery. Whether your injury requires conservative management or surgical intervention, our Senior Consultant Orthopaedic Surgeon provides comprehensive care tailored to your specific needs and goals. With proper treatment and rehabilitation, most patients return to their desired activities without long-term limitations.

Start Your Journey to Recovery

AC joint injuries can make everyday activities difficult. Our Senior Consultant Orthopaedic Surgeon offers guideline-based diagnosis and treatment to support your recovery and help you get back to what you enjoy.

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Dr Zackary Chua (蔡克祥医生)

Senior Consultant Orthopaedic Surgeon (Adult & Paeds)

MBBS (AUS)|MMed (Singapore)|MRCS (Glasgow)|FRCSEd (Orth)

A senior consultant orthopaedic surgeon with dual specialisations in Foot & Ankle Surgery and Paediatric Orthopaedics. Backed by his extensive years of training and experience, Dr Chua brings the necessary knowledge and skills to ensure a smooth recovery journey.

Rooted firmly by two fundamental philosophies: “When one’s feet hurt, one hurts all over” and “Children are not little adults”, Dr Chua’s approach to patient care reflects his compassionate care for adults and children.

Singhealth Quality Excellence Award – Silver (2011)
Service From the Heart Award (2021)
Singapore Health Quality Service Award – Gold (2023)
NUS Medicine Dean’s Award for Teaching Excellence (2023)

His active participation in the medical community extends to mentoring, research supervision, and contributions to key professional forums and symposiums, both locally and internationally.