Kanta Matsuzawa, Masaki Akeda, Jun Sakata, Tomoya Uchida, Noriyuki Kida, Tatsuhiro Suzuki, Tadahiro Sakai
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引用次数: 0
Abstract
Background: Dysfunctional features of distal ulnar collateral ligament (UCL) tears remain unclear. We aimed to clarify the characteristics of valgus and rotational alignment of the ulnohumeral joint at rest in distal UCL tears compared with those in proximal tears.
Methods: The participants were baseball and softball players diagnosed with UCL tears, classified as proximal, middle, or distal. Valgus and rotation alignment of ulnohumeral joint were measured using computed tomography (CT)-like images and a three-dimensional (3D) image analysis system. For valgus alignment, the medial joint space (MJS) was measured as the distance between the medial epicondyle and the ulnar coronoid processes. For rotational alignment, the medial distance (MD) and lateral distance (LD) of the ulnohumeral joint were measured in the reconstructed axial views at the medial epicondyle and trochlear levels. MD was measured as the distance between the medial edges of the olecranon fossa and trochlear notch, whereas LD was measured as the distance between the lateral edges of the olecranon fossa and trochlear notch.
Results: Of the 20 included cases, six (30%) were distal and 14 (70%) were proximal UCL tears. The MJS results showed no significant difference between the two groups. The MD was significantly higher in the distal tear than the proximal tear only at the trochlea level. The LD showed no significant difference at either level.
Conclusion: Distal tears did not show hypervalgus malalignment compared to proximal tears using conventional measurements. In contrast, distal tears showed hyperinternal rotation malalignment of the ulnohumeral joint only at the distal side of the joint compared to proximal tears.
期刊介绍：
The official publication for eight leading specialty organizations, this authoritative journal is the only publication to focus exclusively on medical, surgical, and physical techniques for treating injury/disease of the upper extremity, including the shoulder girdle, arm, and elbow. Clinically oriented and peer-reviewed, the Journal provides an international forum for the exchange of information on new techniques, instruments, and materials. Journal of Shoulder and Elbow Surgery features vivid photos, professional illustrations, and explicit diagrams that demonstrate surgical approaches and depict implant devices. Topics covered include fractures, dislocations, diseases and injuries of the rotator cuff, imaging techniques, arthritis, arthroscopy, arthroplasty, and rehabilitation.
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