Introduction: Antegrade intramedullary locked nailing is a reliable method for the treatment of humeral shaft fractures. There is a still debate on the functional effect due to a possible damage during surgical approach of the rotator cuff, but in the Literature few paper deal with the analysis of tendons in these patients. Ultrasonography is still considered a reliable method in evaluating rotator cuff tendons. The aim of this study is to evaluate if antegrade intramedullary nailing may induce a possible damage on rotator cuff.

Methods: Between May 2002 to December 2005 42 patient suffering of humeral shaft fractures were surgically treated with Unreamed Humeral Nail. Of them 21 (13 males and 8 female) were followed (average follow-up 22,9 months). All the fractures were traumatic except 1 due to bone metastasis of carcinoma. Follow up was clinical with Constant Score, radiographic in 3 projection (neutral, internal and external), and ultrasonographic, evaluating tendon of m. Sovraspinosus.

Results: Healing of fractures was obtained after 2 month from surgery in all cases; Constant Score’s average was 77,0. Three cases of impingement syndrome due to excessive length of nail were observed, healed after the nail removal. Ultrasonography showed that in 13 cases rotator cuff was normal. In 5 cases we have found a signicative hyperecogen area, related to the scarf. We have never had a damage of tendon in all its tickness.

Conclusion: Our study confirms that antegrade intra-medullary nail is a reliable method for the treatment humeral shaft fractures, not adversely influenced shoulder tendons. Damage of rotator cuff observed in few cases is not related to surgical technique, but depends on surgical pitfall with an excessively long nail and then impingement syndrome.