Biomechanical insights into the aetiology of infraspinatus syndrome

Reeser, Jonathan C.; Fleisig, Glenn S.; Cools, Ann; Yount, Darcie L.; Magnes, Scott A.

doi:10.1136/bjsports-2011-090918

Cited by 32 publications

(27 citation statements)

References 22 publications

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“…If we assume that the amount of spiking is a risk factor for shoulder problems, 26 then the position-related difference in the number of spikes during a volleyball game 27 would suggest differently. This is particularly evident for setters, who perform considerably fewer attack jumps than other volleyball players.…”

Section: Discussionmentioning

confidence: 99%

Strength Asymmetry of the Shoulders in Elite Volleyball Players

Hadžić

Sattler

Veselko

et al. 2014

Journal of Athletic Training

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Context: Volleyball players are reported to have shoulder strength imbalances. Previous authors have primarily investigated small samples of male players at a single skill level, without considering playing position, and with inconsistent findings.Objective: To evaluate shoulder strength asymmetry and a history of shoulder injury in a large sample of professional volleyball players of both sexes across different playing positions and skill levels.Design: Descriptive laboratory study. Patients or Other Participants: A sample of 183 volleyball players (99 men, 84 women).Main Outcome Measure(s): We assessed shoulder internal-rotator and external-rotator concentric strength at 608/s using an isokinetic dynamometer and dominant-nondominant differences in shoulder strength and strength ratios using repeatedmeasures analyses of variance. Peak torque was normalized for body mass and external-rotation/internal-rotation concentric strength.Results: Internal-rotation strength was asymmetric in favor of the dominant side in both sexes, regardless of previous shoulder injury status. Male volleyball players had a lower shoulder strength ratio on the dominant side, regardless of previous shoulder injury status. However, this finding was valid only when hand dominance was taken into account. Female volleyball players playing at a higher level (ie, first versus second division) were 3.43 times more likely to have an abnormal strength ratio. Playing position was not associated with an abnormal shoulder strength ratio or strength asymmetry.Conclusions: In male volleyball players, the externalrotation/internal-rotation strength ratio of the dominant shoulder was lower, regardless of playing position, skill level, or a previous shoulder injury. In female players, the ratio was less only in those at a higher skill level. Although speculative, these findings generally suggest that female volleyball players could have a lower risk of developing shoulder-related problems than male volleyball players. Isokinetic shoulder testing may reveal important information about the possible risk factors for shoulder injuries, so we recommend including it in the functional screening of volleyball players.Key Words: isokinetic testing, muscle imbalances, injury prevention, muscle strength Key PointsMale volleyball players had a lower external-rotation/internal-rotation strength ratio of the dominant shoulder. Female volleyball players at a higher skill level were 2.5 times more likely to have abnormal strength ratios. When analyzing shoulder strength findings, we must consider hand dominance. Functional screening of volleyball players could include isokinetic testing.I sokinetic strength testing can play an important part in the comprehensive evaluation and rehabilitation of a patient with a shoulder injury. 1 Of all the muscle groups of the shoulder, evaluation of the shoulder external rotators (ERs) and internal rotators (IRs) is most informative because those muscle groups are responsible for dynamic stabilization of the glenohumeral joint. 2 One ...

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Section: Discussionmentioning

confidence: 99%

Strength Asymmetry of the Shoulders in Elite Volleyball Players

Hadžić

Sattler

Veselko

et al. 2014

Journal of Athletic Training

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“…25 Infraspinatus weakness is a possible factor associated with shoulder injury in overhead athletes. 26 We chose the supine position because of scapular stabilization from the participant's trunk on the bench.…”

Section: Measurement Proceduresmentioning

confidence: 99%

Age-Related, Sport-Specific Adaptions of the Shoulder Girdle in Elite Adolescent Tennis Players

Cools

Palmans

Johansson

2014

Journal of Athletic Training

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“…They are known to cause supra-scapular neuropathy, instability and rotator cuff pathologies such as impingement (Page, 2011). When spiking and serving, volleyball players place their arm in an extremely stressful position, abducting their glenohumeral joint to 1508, with the simultaneous eccentric contraction of the infraspinatus to decelerate the upper limb after ball contact (Ferretti, Cerullo, & Russo, 1987;Reeser, Fleisig, Cools, Yount, & Magnes, 2013;Rokito, Jobe, Pink, Perry, & Brault, 1998). This eccentric overload together with the repetitive stresses on the tendons of the shoulder rotator cuff muscles and capsule are believed to be the main causes of shoulder overuse injuries (Wang & Cochrane, 2001) and result in pain, weakness and a reduced range of motion.…”

Section: Introductionmentioning

confidence: 99%

Shoulder 3D range of motion and humerus rotation in two volleyball spike techniques: injury prevention and performance

Seminati

Marzari

Vacondio³

et al. 2015

Sports Biomechanics

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Repetitive stresses and movements on the shoulder in the volleyball spike expose this joint to overuse injuries, bringing athletes to a career threatening injury. Assuming that specific spike techniques play an important role in injury risk, we compared the kinematic of the traditional (TT) and the alternative (AT) techniques in 21 elite athletes, evaluating their safety with respect to performance. Glenohumeral joint was set as the centre of an imaginary sphere, intersected by the distal end of the humerus at different angles. Shoulder range of motion and angular velocities were calculated and compared to the joint limits. Ball speed and jump height were also assessed. Results indicated the trajectory of the humerus to be different for the TT, with maximal flexion of the shoulder reduced by 10 degrees, and horizontal abduction 15 degrees higher. No difference was found for external rotation angles, while axial rotation velocities were significantly higher in AT, with a 5% higher ball speed. Results suggest AT as a potential preventive solution to shoulder chronic pathologies, reducing shoulder flexion during spiking. The proposed method allows visualisation of risks associated with different overhead manoeuvres, by depicting humerus angles and velocities with respect to joint limits in the same 3D space.

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Biomechanical insights into the aetiology of infraspinatus syndrome

Cited by 32 publications

References 22 publications

Strength Asymmetry of the Shoulders in Elite Volleyball Players

Strength Asymmetry of the Shoulders in Elite Volleyball Players

Age-Related, Sport-Specific Adaptions of the Shoulder Girdle in Elite Adolescent Tennis Players

Shoulder 3D range of motion and humerus rotation in two volleyball spike techniques: injury prevention and performance

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