A 28-year-old rugby player presents to the Emergency Department following a direct tackle to the right shoulder. He is holding his arm in adduction. Clinical examination reveals a prominent distal clavicle and significant tenderness at the AC joint. You are presented with the following radiograph.
Describe your findings and classify the injury according to the Rockwood system.
Candidate: The radiograph shows a superior displacement of the distal clavicle relative to the acromion. The coracoclavicular (CC) interval is significantly increased compared to the contralateral side. This represents a complete disruption of both the AC and CC ligaments. Based on the Rockwood classification, this is a Type III injury.
Candidates often stop at "Type III." A high-scoring candidate must differentiate between Type III and Type V. Failing to comment on the degree of displacement relative to the clavicular shaft diameter or failing to assess the soft tissue envelope (deltoid/trapezius) often leads to a lower score.
Start with a systematic description: "The radiograph demonstrates a superior dislocation of the distal clavicle. The CC interval is increased by [X]%. This indicates a complete tear of both the AC and CC ligaments. To classify, I would measure the displacement; if it is 25-100%, it is a Rockwood Type III. If it exceeds 100% of the normal CC interval, or the clavicle is displaced by more than one shaft diameter, it represents a Type V injury, which implies extensive stripping of the deltoid and trapezius origin."
The patient in the previous scenario is a professional athlete. He wants to know your management plan. What are the key decision-making factors for surgical versus non-operative treatment in high-grade AC joint injuries?
Candidate: For Type III injuries, non-operative management is often successful for the general population. However, for a professional athlete, I would consider operative stabilization due to their high functional demands, overhead requirements, and desire to return to sport without pain or deformity.
Suggesting surgery for every Type III injury is incorrect. Candidates must demonstrate an understanding of the literature showing that long-term functional outcomes for non-operative management are often equal to operative management, thereby framing surgery as a decision based on "patient-specific demands" rather than a blanket rule.
Structure the answer by categories: 1. Injury Type: Types IV, V, and VI are absolute indications for surgery due to mechanical instability or soft tissue incarceration. 2. Functional Demand: In an overhead athlete or heavy laborer, the persistent weakness and scapular dyskinesis associated with Type III can be debilitating; therefore, anatomical reconstruction is often preferred. 3. Evidence Base: Acknowledge that while radiographic reduction is better with surgery, meta-analyses show no significant difference in long-term functional scores between non-operative and operative cohorts for Type III. The decision for the athlete is therefore a risk/benefit discussion regarding return-to-play speed vs. surgical morbidity (e.g., hardware failure, infection).
You decide to proceed with a surgical repair using a suture-button construct. What are the main risks associated with this technique, and how do you minimize the risk of neurovascular injury?
Candidate: Suture-button risks include tunnel widening, infection, or hardware breakage. To protect neurovascular structures, I ensure careful dissection around the coracoid and use fluoroscopy to guide the drill, keeping the trajectory away from the brachial plexus and subclavian vessels.
Being vague about the anatomy. An examiner expects you to know exactly where the danger lies: the brachial plexus and subclavian vessels lie medial and posterior to the coracoid. A "perfect" candidate will explicitly mention the use of a protective retractor or a "finger-palpation" technique under the coracoid base.
Start with the technical risks: Suture-button constructs carry risks of tunnel osteolysis, hardware failure, and loss of reduction. Neurovascular Safety: 1. Anatomy: The brachial plexus and subclavian vessels are at risk, specifically medial and posterior to the coracoid. 2. Technique: I would utilize a blunt dissection to expose the base of the coracoid. 3. Protection: I would place a small, malleable retractor or a Freer elevator between the inferior surface of the coracoid and the underlying neurovascular structures to act as a 'backstop' during drilling and suture passage. 4. Fluoroscopy: Intraoperative imaging is mandatory to confirm drill trajectory through the base of the coracoid and the midpoint of the clavicle.
Detailed Chapters & Topics
Dive deeper into specialized chapters regarding ac-joint-injuries