Objective: To evaluate the integrity of the subscapularis tendon by strength, function and magnetic resonance imaging after deltopectoralis access for anterior shoulder instability. Methods: 20 patients with anterior shoulder instability have been evaluated. Minimum follow-up was 12 months, with a mean of 40 months. Only male patients were included, with a mean of age of 29 years (20 − 42 years). The patients have been submitted to physical examinations of mobility, muscular strength, Belly Test and Gerber Test. The isokinetic strength in internal and external rotation, in angular speeds of 600/s and 1800/s, for both shoulders was measured using a dynamometer. In 15 patients magnetic resonance imaging (MRI) was carried out on both shoulders for evaluating the thickness, cross-sectional area and atrophy of the subscapularis muscle. Results: A significant difference was found between torque peaks at the speed of 600/s for internal (p=0.036) and external (p=0.008) rotation. However, at 1800/s the opposite happens (internal rotation: p=0.133; external rotation: p=0.393). Subscapularis muscle thickness and area are significantly smaller than the normal side, with a deficit of 19% and 23%, respectively. According to Rowe and UCLA scores, we find excellent and good results for the majority of patients, with a mean of 88 and 31.6 points, respectively. Conclusion: Despite of the good functional results, open surgery can limit strength and reduce the thickness and the cross-sectional area of subscapularis muscle. However, the best results were found in the patients who had the dominant side operated.
rEsUMOObjetivo: Avaliar a integridade do músculo subescapular através da força, função e ressonância nuclear magnética após acesso deltopeitoral para tratamento da luxação glenoumeral anterior recidivante. Métodos: Foram avaliados 20 pacientes com luxação recidivante do ombro. Todos os casos possuíam seguimento mínimo de 12 meses, com média de 40 meses. Os pacientes eram todos do sexo masculino, com média de idade de 29 anos (20-42 anos). Os pacientes foram submetidos a exame físico para avaliar mobilidade, força muscular, "Belly" Teste e teste de Gerber. A força isocinética em rotação interna e externa, em velocidades angulares de 60 0 /s e 180 0 /s, em ambos os ombros, foi medida utilizando-se um dinamômetro. Em 15 pacientes foi realizada ressonância nuclear magnética (RNM) em ambos os ombros para avaliação da espessura, área e possível hipotrofia do músculo subescapular. Resultados: Houve diferença significativa entre os picos de torque para a velocidade de 60 0 /s para as rotações interna (p = 0,036) e externa (p = 0,008). Porém, para a velocidade de 180 0 /s a situação se inverte (rotação interna: p = 0,133; rotação externa: p = 0,393). A espessura e a área do subescapular são significativamente menores que as do lado normal, com déficit de 19% e 23%, respectivamente. De acordo com os escores de Rowe e da UCLA, observamos excelentes e bons resultados na maioria dos pacientes, com média de 88 e 31,6 pontos, respectivamente. Conclusão: Apesar dos bons resultados funcionais, a cirurgia aberta pode restringir a força, bem como reduzir a espessura e a área da seção transversal do músculo subescapular. Os melhores resultados ocorreram no lado dominante.
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