Kim JH, Kim GT, Yoon S, et al. - This study was attempted to assess the relationship between serum Vit B ₁₂ levels and degenerative rotator cuff (RC) tear. Researchers included a total of 87 consecutive patients with or without degenerative RC tear. They assessed possible risk factors (age, gender, medical history, bone mineral density, and serum chemistries including glucose, magnesium, calcium, phosphorus, zinc, homocysteine, Vitamin D, Vit B ₁₂, homocysteine, and folate). A significant association was found between low serum levels of Vit B ₁₂ and degenerative RC tear. Future studies are needed to evaluate whether Vit B ₁₂ supplementation can decrease the risk of this condition.