Prevalence of shoulder instability after rotator cuff injury in professional cricket bowlers

INTRODUCTION

Cricket is one of the most transcendent and physically demanding sports in the world, requiring a complex, multifaceted combination of strength, endurance, coordination, and technical precision.^[1] Among the various on-field positions, bowling has particularly high biomechanical requirements for the shoulder due to repetitive overhead exercises with extensive motion, high angular velocities, and high eccentric loads during deceleration.^[2,3] Therefore, shoulder injuries are a topical cause of morbidity in cricket, with the percentage of time-loss injuries being significant with respect to bowlers and fielders who participate in frequently throwing activities.^[4]

The shoulder complex has been uniquely designed to enhance mobility optimization rather than natural stability.^[5] The condition of functional integrity depends on the interaction of both the dynamic and the static stabilizers, namely, the rotator cuff and the scapular musculature, respectively, and the capsulolabral structures.^[6] Repeated microtrauma can lead to rotator cuff tendinopathy or tear, cause capsular laxity, and alter neuromuscular control, thereby increasing the likelihood of glenohumeral instability in overhead athletes.^[7] Shoulder instability in athletes can manifest as recurrent subluxation, fear, pain, or functional limitation without frank dislocation.^[8,9]

Cricket bowling can be described as having sequential phases, i.e., run-up, pre-delivery stride, delivery, and follow-through, all of which are involved in the generation and transfer of some amount of force along the kinetic chain.^[10] During delivery, there is a significant external rotational torque on the shoulder, followed by rapid internal rotation and deceleration, and the rotator cuff (especially the supraspinatus and infraspinatus) is strained significantly.^[11] Insufficient stabilization of the humeral head by these structures can result in excessive translational motion and symptomatic instability. Constant stress may worsen the rotator cuff condition and undermine joint stability, thereby increasing the risk of recurrent instability.^[12]

Past studies have shown that bowlers have higher rates of shoulder injuries than batters; fast and spin bowlers have distinct injury patterns attributable to differences in bowling mechanics.^[13,14] Research in high-end cricketing countries documents prevalence rates of shoulder injuries between 17% and 23%, with a significantly high rate being attributed to overuse mechanisms.^[15] However, much of the available literature focuses on general shoulder pain or injury rates rather than the correlation between rotator cuff injury and subsequent instability. In addition, most epidemiological data are based in high-income nations, thereby limiting generalizability to low- and middle-income settings where the training burden, medical facilitation, and injury surveillance systems may vary significantly.^[16]

Rotator cuff tear has been previously cited as a risk factor for shoulder instability among overhead athletes.^[17] Any damage to the cuff structure reduces compressive forces needed to retain the humeral head in the glenoid fossa, especially in high-velocity movement.^[18] Furthermore, neuromuscular control might be further compromised by pain-mediated inhibition and scapulohumeral rhythm change, which further leads to instability and worsening of functioning.^[19] Despite these identified mechanisms, the incidence and pathophysiology of shoulder instability following rotator cuff injury among cricket bowlers remain poorly characterized. This relationship is clinically important to understand for several reasons. Shoulder instability not only limits athletic performance but also predisposes athletes to recurrent injury, prolonged rehabilitation, and early exit from competitive sport.^[20] Early detection of signs of instability could enable targeted rehabilitation to strengthen rotator cuff endurance, scapular control, and integration of the complex kinetic chain, thereby potentially halting progression to more severe pathology that may require surgical treatment.^[15,17] Moreover, measures of the functional load of instability can guide the coaching interventions, workflow strategies, and injury prevention interventions.^[21]

Cricket is a well-established component of the sporting culture of Pakistan; however, there is limited literature on musculoskeletal injuries associated with the sport. The majority of existing data are based on small, nonstandardized studies, leaving a substantial evidence gap for sports medicine practitioners working with cricketers. Filling this gap is urgent to develop context-specific preventive and rehabilitative strategies that align with local training settings and resource availability. The main objective of this study, therefore, was to determine the frequency of shoulder instability among bowlers with a history of rotator cuff injury, using a validated patient-reported outcome measure. The secondary objective was to measure the functional effects of instability on daily activities, pain, and sporting participation. The study aimed to provide substantive information to support clinical decision-making and injury prevention efforts in cricket by presenting epidemiological and functional data from a cohort of professional bowlers.

MATERIALS AND METHODS

RESULTS

The participants were 126 professional cricketers, with a mean age of 26.9 years (standard deviation = 4.2). The model age distribution was 26 years, accounting for 63.5% of the group. A history of previous rotator cuff injury was reported by all participants [Table 1].

DISCUSSION

This study evaluated the occurrence and functional effects of shoulder instability-related symptoms in cricket bowlers with a history of rotator cuff injury, using a validated patient-reported outcome measure. The key results were as follows: (1) Dysfunction caused by instability was prevalent: Most of the bowlers had fair shoulder functionality, with a good percentage of them reporting repeated subluxation or dislocation with moderate to severe pain; and (2) there was no significant difference between the instability in younger and older bowlers. All of the above evidence underscores shoulder instability as a clinically important complication of rotator cuff pathology in cricket bowlers and the urgent need to implement systematic prevention and rehabilitation interventions.

The reported functional profile, which indicates predominantly fair stability and persistent symptoms, suggests that many bowlers will train and compete with biomechanically compromised shoulders. This trend is similar to previous reports of overhead athletes with symptomatic instability often going unabated despite participation as a performance factor and the motivation of being on the field.^[9] According to Ranson and Gregory, approximately 20 percent of professional cricketers, particularly bowlers and fielders, report shoulder complaints, and most of these problems are attributable to repetitive overload rather than acute injury.^[27] The present results also suggest an overuse-dominant trend, in which repeated exposure of the rotator cuff to unfavorable functional states induced cycles of instability.

The frequent occurrence of recurrent subluxation- and dislocation-related symptoms in the current sample is consistent with theoretical approaches that underscore the stabilizing, dynamic nature of the rotator cuff.^[28] Degeneration and pain-induced inhibition resulting from microtrauma may reduce compressive stabilization, thereby allowing excessive humeral head translation.^[19] According to Ben Kibler et al., the phenomenon is a subset of a larger kinetic-chain dysfunction in which scapular positioning is altered, thereby impairing glenohumeral mechanics.^[29] This neuromechanical cascade aligns with functional implications of this cohort, i.e., avoidance of activities, training inhibition, and persistent symptom awareness.

Notably, the severity of instability symptoms did not correlate with age, indicating that accumulated mechanical load and a history of injuries may be more significant than chronological age per se. Compared with other sports, research on baseball and handball players has found them to be unstable in the largest age group under conditions of high-volume overhead exposure.^[30,31] The fact that we had an age-equalized result thus supports the idea that even relatively young bowlers can become clinically unstable when the rotator cuff is damaged. These findings have clinical implications, suggesting that screening and preventive programs need not be applied only to older or experienced players but should be implemented proactively at all phases of athlete development.

In the context of the existing literature, the current prevalence estimates appear higher than the reported generalized shoulder injury prevalence rates in cricket (17–23%), likely due to variations in definitions and populations. Previous studies mainly analyzed general shoulder pain or injury rates. However, here we targeted bowlers who had previously suffered a rotator cuff injury, a group with a biological predisposition to instability. Bush and colleagues emphasized that nonoperative treatment of rotator cuff tears can enhance functional outcomes, yet strength may be left behind, which may explain the ongoing instability in the existing cohort.^[28] In addition, Warby et al. noted that with repeated micro-instability, one can progress to symptomatic multidirectional instability unless properly rehabilitated- once again in agreement with our symptom-dominant findings.^[32]

The other applicable comparison is intervention-based research. Jaggi and Lambert showed that symptomatic instability can be significantly improved through nonfunctional rehabilitation that focuses on scapular control and rotator cuff endurance.^[33] Our findings indirectly justify such strategies. Although most bowlers performed at an average level, almost half reported that their daily and sporting lives had been disrupted, suggesting a high potential for meaningful improvement through targeted rehabilitation. On the contrary, the surgical literature warns that the outcome of instability repair is poorer in the face of severe soft-tissue destruction or recurrent overloading of the joint by sportsmen.^[34,35] This confirms the need to have conservative optimization preceding a surgical thought.

Mechanistically, multiple interacting factors may explain why instability symptoms persist in our population. Bowling creates very high external rotation torques and then demands high internal rotation at high speed and eccentric deceleration as a result.^[14] When the rotator cuff is weakened, even in subtle forms, capsulolabral tissues become exposed to repeated shear forces, which may result in laxity, labral fraying, and proprioceptive disruption. Pain also interferes with motor control, resulting in maladaptive movement patterns.^[19] Even prior restrictions under lower-resource cricket conditions might go undetected without access to more sophisticated conditioning methods or continuous clinical surveillance.^[32] Therefore, some of our results can be attributed to differences in contextual injury surveillance, monitoring of workload, and rehabilitation.

In clinical practice, several practical implications arise. To begin with, screening for instability symptoms should be added to the medical examination of Cricketing players, specifically bowlers, who have reported having had previous shoulder injury. Monitoring tools such as the OISS are cost-effective and highly efficient for patient-reported outcomes. Second, rather than focusing solely on isolated strengthening, rehabilitation programs should prioritize rotator cuff endurance, scapular neuromuscular control, and kinetic chain integration. Third, the recurrent threat of instability can be mitigated by workload management strategies, such as bowling volume tracking, prescribed rest intervals, and assessment of technique quality. These strategies need to be incorporated into training systems by collaborating among physiotherapists, coaches, and medical teams. Moreover, this research provides area-specific evidence. Much of the available literature is based on high-income cricketing contexts, where medical infrastructure differs significantly from that in Pakistan. The observation of the same or higher incidence of instability symptoms in our cohort underscores the need for comparable, locally specific injury-prevention models and rehabilitation protocols. This also leads to the assumption that the lack of publication in South Asia may be explained not by true rarity but by under-recognition.

There are a few limitations to consider. To begin with, the cross-sectional study design inherently precludes causal inference about the relationship between rotator cuff damage and future shoulder instability. Second, episodes of instability were measured by a 6-month recall measure, which presents a methodological bias as it could create recall bias and, possibly, affect prevalence estimates. Third, the rotator cuff history was based on clinical records rather than imaging confirmation. Moreover, the use of convenience sampling of three academies could limit the generalizability of the findings to other levels or regions of competition. Participants’ playing experience was recorded descriptively, but no inferential analyses were conducted to investigate the interaction between playing experience levels and the intensity of self-reported instability symptoms. Therefore, no possible exposure-response associations could be investigated between cumulative bowling experience and instability symptom severity. The research lacked the differentiation between the form or grade of rotator cuff pathology. As a result, the possible change in instability-related symptoms depending on the degree of rotator cuff involvement could not be investigated. Finally, even though the OISS is a validated and patient-reported outcome measure, the respondent’s score can be affected by personal experiences of pain and other psychological factors.

CONCLUSION

Overall, the evidence presented in this research indicates that shoulder instability symptoms were common among cricket bowlers with a history of rotator cuff injury and were accompanied by pain, mechanical impairment, and functional decline. The intensity of instability symptoms also did not appear to be age-dependent, suggesting that biomechanical strain and prior injury are major determinants. These results underscore the need to identify these issues early, implement contextually relevant rehabilitation, and manage workload rigorously to reduce recurrent instability and extend the sporting careers of bowlers in cricket.