Exploring age-related differences in asymptomatic male shoulder kinematics using four-dimensional computed tomography
Notice bibliographique
Résumé
Background: Understanding age-related differences in shoulder glenohumeral and scapulothoracic motion has implications for the understanding, treatment, and management of shoulder injuries and diseases.Previous studies have investigated age-related differences, although statically and in single plane motion.The shoulder, however, is a complex joint capable of a wide range of motion and involves coordinated and synchronous movements from both the glenohumeral and scapulothoracic joints.Therefore, the objectives of this study were to measure age-related differences in kinematics of the glenohumeral and scapulothoracic joints during motion, as well as differences in the neutral positioning of the scapula and humerus.Methods: Thirty-one male participants comprised two cohorts based on age (<45 and 45 years).Participants performed two motions, forward elevation (FE) and internal rotation to the back (IR), with four-dimensional CT scanning to dynamically track the bones.The kinematics of the humerus and scapula were calculated with six degrees-of-freedom.The neutral position of the scapula and humerus was also calculated based on a static CT scan.Results: During the FE motion, internal rotation of the humerus was significantly greater (13, p=0.033) in the older cohort while the scapula had significantly more anterior translation (9mm, p=0.022) and medial rotation (9, p=0.021) in the younger cohort.Anterior translation of the humeral head during IR was significantly greater (1mm, p=0.05) in the younger cohort, while scapular superior translation was significantly greater (8mm, p=0.006) in the older cohort.When measuring humeral translation as a percentage of glenoid width rather than absolute translation, the older cohort exhibited significantly less translational ROM during FE (6%, p<0.001), (5%, p=0.036), (5%, p=0.009) and IR (6%, p<0.001), (6%, p<0.001), (4%, p<0.001) in the respective anterior, superior, and lateral directions.Furthermore, compared to the younger cohort, the older J o u r n a l P r e -p r o o f Age-Related Differences in Shoulder Kinematics cohort had a neutral pose with significantly more superior translation (17mm, p=0.05), lateral rotation (8, p=0.009) and posterior tilting (10, p<0.001) of the scapula, and a more anteriorly positioned humerus (2mm, p=0.007). Conclusions:Overall, this study found age-related differences in kinematics and neutral positioning of the scapula and humerus, which may help improve understanding of age-related differences in subluxation, diseases, injuries, and range of motion.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».