Effect of Posterior Capsule Tightness and Humeral Retroversion on 5 Glenohumeral Joint Range of Motion Measurements: A Cadaveric Study

Autor(es)

Rosa, Dayana P. ^{[1, 2]} ; Camargo, Paula R. ^{[1, 2, 3]} ; Borstad, John D. ^{[1, 3]}

Afiliação do(s) autor(es)

^[1] Ohio State Univ, Columbus, OH 43210 - USA

^[2] Univ Fed Sao Carlos, Sao Paulo - Brazil

^[3] Coll St Scholastica, Duluth, MN - USA

• Tipo de documento: Artigo Científico
• Fonte: AMERICAN JOURNAL OF SPORTS MEDICINE; v. 47, n. 6, p. 1434-1440, MAY 2019.
• Citações Web of Science: 0

Resumo

Background: Altered glenohumeral joint range of motion can be caused by increased humeral retroversion (HR) and/or posterior capsule tightness (PCT). To make informed clinical decisions, it is vital to understand how HR and PCT alterations, individually and in combination, affect joint range of motion measurements. Purpose: To evaluate the effect of experimental tissue alterations on clinical range of motion measures. Study Design: Controlled laboratory study. Methods: Five clinical measurements were quantified in 8 fresh-frozen cadavers under 4 experimentally created conditions: baseline (no alterations), HR condition (20 degrees increase in HR by transecting the bone), PCT condition (20% decrease in length via thermal energy), and PCT + HR combined. Clinical measurements included bicipital forearm angle, low flexion, glenohumeral internal and external rotation, and horizontal adduction. All measurements were taken by the same blinded tester. Separate 1-factor repeated measures analyses of variance were used to evaluate the effect of the alterations on each clinical measurement. Results: There was a significant main effect of condition for bicipital forearm angle (P = .02, F = 4.03), low flexion (P = .02, F = 3.86), internal rotation (P = .03, F = 3.65), and external rotation (P < .001, F = 15.15) but not for horizontal adduction (P = .29, F = 1.33). The HR condition resulted in a decreased bicipital forearm angle of 16.1 degrees and 15.8 degrees as compared with the PCT and PCT + HR conditions, respectively. When compared with baseline, the PCT + HR condition decreased the low flexion test by 13.5 degrees, and the HR condition decreased internal rotation range of motion by 14.2 degrees. All conditions increased external rotation when compared with baseline. Conclusion: Greater measurement changes were noted in both HR conditions, suggesting that bony alterations influence motion to a greater extent than posterior capsule alterations. (AU)

• Processo FAPESP: 15/14311-3 - Interação entre o encurtamento da cápsula posterior e a retroversão humeral: estudo em cadáveres e in vivo
• Beneficiário: Dayana Patricia Rosa
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado