Shoulder Symptoms Were Reported by 22.4% of 660 Elite Youth Handball Players

A four-season study of elite youth handball found shoulder symptoms in nearly a quarter of players, with lack of strength the single most-reported complaint. The analysis also failed to find distinct symptom clusters, suggesting shoulder symptoms in these athletes vary by severity rather than by type.

Shoulder Symptoms were reported by 148 of 660 elite youth handball players, or 22.4 percent, in a prospective study published on 7 November 2026 in BMC Sports Science, Medicine and Rehabilitation. The affected athletes averaged 14.1 years of age, and the split between boys and girls was almost exactly even.

The work was carried out by a German group led from the Department of Orthopedics at the Koenig-Ludwig-Haus, Julius-Maximilians-University Wuerzburg, with collaborators at the Center for Clinical Studies and the Department of Trauma Surgery at University Medical Center Regensburg. Rather than recruiting a convenience sample, the authors included all elite youth players of the Southern German handball federations across the 2016 to 2020 seasons.

That gave them 660 players, 345 boys and 315 girls. Only one athlete was excluded, for previous shoulder surgery or shoulder-related hospitalization. No a priori sample size was calculated, because the study was designed to cover the whole population rather than to detect a pre-specified effect.

Handball is a useful place to study shoulder symptoms. The overhead throw is repeated thousands of times a season at high velocity, and the resulting overuse picture is familiar enough to have its own name in sports medicine. What has been less clear is how common the problem is before it reaches a clinic, and how severe the shoulder symptoms are when athletes are simply asked.

How the Shoulder Symptoms Were Measured

The instrument was the German translation of the Western Ontario Shoulder Instability Index, usually abbreviated to WOSI. It was distributed five times per season, which is what makes the design prospective rather than a one-off survey.

WOSI contains 21 items, each scored on a 100 millimeter visual analog scale. That produces a total range from 0 to 2100 points, where higher scores mean worse shoulder symptoms. Because the scale was built for shoulder instability rather than for overuse specifically, it captures a broad spread of complaints: strength, apprehension, mechanical noise and function all feed into the total.

Importantly, the headline prevalence figure is permissive. A player counted as reporting shoulder symptoms if a single item out of 21 came back positive. That is a deliberately low bar, and it is the right one for a prevalence question, but it means 22.4 percent should be read as the share of players with any complaint rather than the share with a clinical problem.

Severity Split the Group Roughly in Half

Among the 148 players who reported anything, the mean total was 457.8 points with a standard deviation of 352.0. The spread is the striking part. Scores ran from 4 points, which is effectively a rounding error, up to 1834 points out of 2100.

The authors applied a 420-point cut-off, corresponding to 20 percent of the scale, and 70 of the 148 symptomatic athletes reached it. That is 47.3 percent of the symptomatic group, or about 10.6 percent of the full cohort. So roughly one player in ten carried shoulder symptoms substantial enough to clear a meaningful severity threshold, while the rest sat below it.

That two-tier picture is more useful to a coach than the headline prevalence alone. A quarter of a squad reporting shoulder symptoms is close to background noise in an overhead sport. A tenth of a squad reporting substantial shoulder symptoms is a load-management question.

Lack of Strength Led the Individual Complaints

The item-level results point somewhere specific. Lack of strength scored highest at 31.3 points, with worry that the shoulder will get worse close behind at 29.5, and clicking or snapping at 29.3. Standard deviations on all three were large, between 27 and 31 points, so these are averages across very different individual experiences.

The ordering is worth sitting with. Two of the top three items are not pain. One is a strength deficit and one is apprehension about the future of the joint. That combination fits what is known about overhead overuse, where loss of rotational strength and fear of re-injury often outlast the soreness that first brought the athlete in. FLM has covered the strength side of this before in research on shoulder rotator torque in trained athletes.

Boys and Girls Reported the Same Burden

A multivariate analysis of variance across the four WOSI domains found no significant effect of sex. The reported statistics were a Wilks lambda of 0.987 and an F value of 0.355 on 4 and 107 degrees of freedom, with a p value of 0.840.

A p value that high is not a borderline null. On these data, boys and girls in elite youth handball reported shoulder symptoms at a similar rate and a similar severity, which argues against sex-specific screening thresholds in this population. The caveat is that a non-significant result in a sub-analysis of 148 athletes is not proof of equivalence, only an absence of detected difference.

Why the Search for Shoulder Symptoms Patterns Came Up Empty

The authors also ran a latent class analysis, a statistical method that looks for hidden subgroups in the response data. If some players had a mechanical pattern and others an apprehension pattern, this analysis is how you would find it. It found nothing.

Their conclusion is that the WOSI questionnaire is indicative of symptom severity rather than distinct symptom patterns. In plain terms: these shoulder symptoms appear to differ in how bad they are, not in what kind they are. For practitioners that is a simplifying result, because it suggests one severity scale may be more informative than an attempt to sort athletes into types.

Where This Sits Among Other Overuse Research

Prevalence studies in youth sport keep landing in the same neighborhood. Our report on injury burden across two seasons of artistic swimming described a comparable pattern of widespread low-grade complaints with a smaller group carrying most of the real load.

The training-side literature is more encouraging. Evidence summarized in our coverage of youth resistance training and muscle growth supports supervised strength work in adolescents, which is directly relevant when the top-scoring complaint is a lack of strength. Awareness also matters, as our write-up of a survey of knee ligament injury knowledge and prevention found gaps between what athletes know and what they practice.

What Coaches and Parents Can Reasonably Take From It

This is a prevalence and severity description, not a trial of any intervention. It does not show that any training program prevents shoulder symptoms, and it does not establish that the players who scored highly went on to be injured. Those are different studies.

What it does support is a low-tech habit: ask young overhead athletes about their shoulders regularly, and ask about more than pain. A few general, conservative points follow:

• Screen for strength and confidence, not only soreness, since both outscored other complaints here.
• Expect a minority to carry most of the burden, and track that group rather than the squad average.
• Treat a persistent strength deficit or mechanical clicking as a reason for professional assessment rather than something to train through.

None of this is individualized medical advice. A young athlete with ongoing shoulder symptoms should be assessed by a qualified clinician, who can examine the joint rather than infer from a questionnaire.