Performance Advisory Board – Euroleague Players Association (Authors: Baris Kocaoglu, Igor Jukic, Julio Calleja-González, Francesco Cuzzolin, Mar Rovira, Jaime Sampaio, Antonio Santo)
INTRODUCTION
One of the most common shoulder problems encountered by basketball players are acromioclavicular (AC) joint injuries. Although often perceived as minor injuries, they can significantly affect performance, availability, and confidence – particularly in a sport that demands frequent overhead activity, contact, and falls (1).
For team physicians and sports medicine practitioners, AC joint injuries represent a condition where early decisions on load management, protection, and treatment strategy can make the difference between a short interruption and a prolonged, frustrating season (2).
WHY AC JOINT INJURIES MATTER IN BASKETBALL
Basketball players are exposed to repetitive contact, high-speed direction changes, and frequent falls onto the shoulder. Defensive plays, rebounding, taking charges, and mid-air collisions all create situations in which the lateral shoulder directly absorbs impact (3). Guards and forwards, in particular, are prone to AC joint trauma due to aggressive drives and contested rebounds, while centers are often exposed during post play and physical screens. What makes AC joint injuries challenging is not only pain, but also the loss of trust in the shoulder, especially during shooting, passing, and overhead defensive actions.
MECHANISM OF INJURY AND BIOMECHANICS
The classic mechanism is a direct fall onto the lateral aspect of the shoulder with the arm adducted. This produces a downward force on the acromion relative to the clavicle, stressing the AC and coracoclavicular ligaments (4). Less commonly, indirect mechanisms, such as falling onto an outstretched arm, can also transmit force to the AC joint. From a biomechanical perspective, even low-grade injuries can disrupt the finely balanced scapulothoracic rhythm, leading to pain with cross-body movements, shooting follow-through, and overhead reach.
CLINICAL SPECTRUM: BEYOND SIMPLE SEVERITY LABELS
AC joint injuries in basketball players should be understood as part of a clinical continuum rather than being reduced to simplistic severity labels. These injuries may range from low-grade ligamentous sprains associated with minimal structural disruption to complete joint dislocations with obvious deformity; however, the true clinical relevance often lies elsewhere (5). In practice, evaluating the athlete’s pain characteristics, the presence of horizontal or vertical instability, and most importantly the impact on basketball-specific function provides far greater insight than classification alone. Activities such as shooting, passing, rebounding, and tolerating contact frequently expose subtle deficits that may not be apparent on imaging. For this reason, in basketball players, clinical symptoms and functional performance commonly outweigh radiographic findings when determining treatment strategy and return-to-play timing.
DIAGNOSIS AND ON-COURT DECISION MAKING
Clinical examination remains central. Localized tenderness over the AC joint, pain with cross-body adduction, and discomfort during overhead motion are typical findings. Imaging, primarily radiographs, helps confirm the diagnosis and exclude associated injuries, but should complement, not replace, clinical judgment.
One of the most critical questions for the team physician is: “Can the player continue safely?” In many cases, early protection with taping or bracing, combined with pain control and activity modification, allows short-term continuation without increasing long-term risk.
TREATMENT APPROACH: BALANCING SIMPLICITY AND STRATEGY
The majority of AC joint injuries in basketball players can be managed successfully with non-operative treatment, particularly when early and structured care is implemented (6). Initial pain control, short-term activity modification or brief immobilization when necessary, followed by a progressive program of range-of-motion and strengthening exercises constitute the foundation of management. Rather than prolonged local rest of the AC joint, rehabilitation should emphasize scapular mechanics and rotator cuff endurance to restore functional shoulder stability. Surgical intervention, while not routinely required, has a selective yet important role in specific situations, including high-grade instability associated with persistent functional limitation, failure of well-conducted conservative treatment, or clinically significant horizontal instability that provokes pain during basketball-specific activities (7). Treatment timing remains a critical consideration; during the competitive season, non-operative strategies are often favored whenever safe and feasible, whereas definitive surgical reconstruction may be more appropriately planned in the off-season for carefully selected athletes.
REHABILITATION AND RETURN TO PLAY
Successful return to basketball following an AC joint injury depends far less on radiographic healing than on the athlete’s functional confidence and shoulder control. Players should be able to perform overhead activities without pain, demonstrate symmetrical strength, and tolerate contact situations without apprehension before being cleared for full participation (8).
A return driven solely by the absence of pain at rest, in the presence of inadequate dynamic stability or poor neuromuscular control, often leads to recurrent symptoms and prolonged discomfort. For this reason, return-to-play decisions should prioritize sport-specific function and psychological readiness, ensuring that the athlete can both perform and compete with confidence.
MOBILITY WHERE NEEDED
Optimizing mobility in the appropriate segments is essential to reduce excessive loading on the AC joint during basketball-specific movements. Adequate thoracic extension and rotational mobility allow the shoulder to elevate more efficiently, thereby offloading stress from the AC joint during shooting, overhead passing, and rebounding. At the same time, building isometric and eccentric capacity in the deltoid, rotator cuff, and upper trapezius is critical for tolerating contact and controlling deceleration forces. This balanced approach—restoring mobility where restriction exists while strengthening tissues responsible for force absorption—supports both injury prevention and resilient return to play.
SCAPULAR CONTROL BEFORE SHOULDER STRENGTH
In both prevention and rehabilitation of AC joint injuries, restoring scapular control should precede isolated shoulder strengthening. Emphasis on posterior tilt and retraction strength—particularly targeting the lower trapezius and serratus anterior—is essential for maintaining optimal scapulothoracic mechanics. Inadequate scapular control increases shear stress across the AC joint, a problem that becomes especially evident during repetitive shooting and overhead passing. By prioritizing scapular stability, athletes can achieve more efficient force transfer through the shoulder girdle, reducing joint overload while enhancing performance and durability on the court.
MASTERING FALL AND CONTACT MECHANICS
Given the high frequency of falls and physical contact in basketball, mastering safe fall and contact mechanics plays a critical role in reducing the risk of AC joint injuries. Rather than instinctively landing on the lateral aspect of the shoulder, players should be trained to dissipate energy through controlled rolling strategies that distribute impact forces across larger body segments. Incorporating perturbation drills and progressively controlled contact scenarios into training allows athletes to better tolerate unexpected collisions during rebounds, charges, and screens. This proactive approach not only enhances injury prevention but also improves on-court confidence, enabling players to engage physically without excessive protective behavior that may compromise performance.
FINAL MESSAGE
AC joint injuries in basketball players are common, sometimes underestimated, and highly relevant to performance. A balanced, athlete-centered approach combining accurate diagnosis, thoughtful non-operative care, selective surgical indication, and sport-specific rehabilitation offers the best outcomes. For team doctors, sports physicians, and players alike, understanding the functional implications of these injuries is key to keeping athletes both competitive and confident on the court.
References
1. Kiel J, Taqi M, Kaiser K. Acromioclavicular Joint Injury. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 [cited 2026 Jan 15]. Available from: http://www.ncbi.nlm.nih.gov/books/NBK493188/
2. Gorgun B, Maman E, Marchi G, Milano G, Kocaoglu B, Hantes M. Shoulder Injuries in Basketball. In: Laver L, Kocaoglu B, Cole B, Arundale AJH, Bytomski J, Amendola A, editors. Basketball Sports Medicine and Science [Internet]. Berlin, Heidelberg: Springer; 2020 [cited 2026 Jan 16]. p. 251–63. Available from: https://doi.org/10.1007/978-3-662-61070-1_23
3. Borbas P, Warby S, Yalizis M, Smith M, Hoy G. Return to Play After Surgical Treatment of High-Grade Acromioclavicular Joint Injuries in the Australian Football League. Orthop J Sports Med. 2022 Apr;10(4):23259671221085602.
4. Moyal AJ, Burkhart RJ, Adelstein JM, Voos JE, Apostolakos JM, Calcei JG. Acromioclavicular and sternoclavicular joint injuries in contact sports: a narrative review of conservative and surgical treatments. Ann Jt. 2025;10:31.
5. Albishi W, AlShayhan F, Alfridy A, Alaseem A, Elmaraghy A. Acromioclavicular joint separation: Controversies and treatment algorithm. Orthop Rev (Pavia). 16:94037.
6. Niehaus R, Schleicher A, Ammann E, Kriechling P, Lenz CG, Masanneck M, et al. Operative vs. conservative treatment of AC-Joint Dislocations Rockwood grade ≥ III -An economical and clinical evaluation-. Cost Eff Resour Alloc. 2023 Sept 13;21:63.
7. Perraut G, Neubauer BE, Cherelstein RE, Chang ES. Acromioclavicular Joint Repair and Reconstruction With a Tensionable Cerclage System Using a Single Clavicular Drill Hole. Arthrosc Tech. 2025 June;14(6):103499.
8. Elliott WC, Olivo B, Abraham A, Hernandez EJ, Hanna T. Return to Sport After Acromioclavicular Injury: A Systematic Review of Modifiable Factors. J Clin Med. 2025 Oct 28;14(21):7656.
