Relationship between bilateral humeral retroversion angle and starting baseball age in skeletally mature baseball players-existence of watershed age.
J Shoulder Elbow Surg
; 28(5): 847-853, 2019 May.
Article
em En
| MEDLINE
| ID: mdl-30685277
ABSTRACT
BACKGROUND:
Repetitive pitching in childhood was thought to restrict the physiological derotation process of the humeral head. Some studies reported that the side-to-side differences of humeral retroversion in baseball players occurred between the age of 9 and 11 years. The present study investigated the relationship between bilateral humeral retroversion angle and starting baseball age in skeletally mature baseball players.METHODS:
One hundred and seventeen male baseball players, who belonged to a college or amateur team, were investigated. Bilateral humeral retroversion was assessed using an ultrasound-assisted technique as described by previous studies. All players were divided into four groups players who had started playing baseball before the age of 6 years, between 7 and 8 years, between 9 and 10 years and after 11 years. Bilateral humeral retroversion angle was compared among the four starting age groups.RESULTS:
All players started playing baseball between 5 and 12 years. Comparing the throwing arm, humeral retroversion in starting age group 11-12 (72°) was significantly smaller than the other 3 groups (81°, 82°, and 80° for groups 5-6, 7-8, and 9-10, respectively). Comparing the non-throwing arm revealed no significant differences among the 4 starting age groups (71°, 72°, 70°, and 66° for groups 5-6, 7-8, 9-10, and 11-12, respectively).CONCLUSIONS:
Skeletally mature baseball players who started playing baseball after 11 years had significantly smaller humeral retroversion in the throwing arm than those who started baseball before 11 years.Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Articulação do Ombro
/
Beisebol
/
Amplitude de Movimento Articular
/
Cabeça do Úmero
Tipo de estudo:
Diagnostic_studies
Limite:
Adolescent
/
Adult
/
Child
/
Humans
/
Male
Idioma:
En
Revista:
J Shoulder Elbow Surg
Assunto da revista:
ORTOPEDIA
Ano de publicação:
2019
Tipo de documento:
Article