Devon J Ryan

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BACKGROUND Adult spinal deformity is a prevalent cause of pain and disability. Established measures of sagittal spinopelvic alignment such as sagittal vertical axis and pelvic tilt can be modified by postural compensation, including pelvic retroversion, knee flexion, and the use of assistive devices for standing. We introduce the T1 pelvic angle, a novel(More)
STUDY DESIGN Retrospective review of a multicenter database of consecutive patients undergoing 3-column osteotomy for treatment of adult spinal deformity (ASD). OBJECTIVE To rigorously develop a T1 pelvic angle (TPA) categorization paradigm and use it to assess the surgical management of patients with ASD. SUMMARY OF BACKGROUND DATA TPA, the angle(More)
STUDY DESIGN Post hoc analysis of prospectively collected data. OBJECTIVE Development of methods to determine in vivo spinal cord dimensions and application to correlate preoperative alignment, myelopathy, and health-related quality-of-life scores in patients with cervical spondylotic myelopathy (CSM). SUMMARY OF BACKGROUND DATA CSM is the leading cause(More)
STUDY DESIGN Multicenter, prospective, consecutive, surgical case series from the International Spine Study Group. OBJECTIVES To evaluate the effectiveness of surgical treatment in restoring spinopelvic (SP) alignment. SUMMARY OF BACKGROUND DATA Pain and disability in the setting of adult spinal deformity have been correlated with global coronal(More)
STUDY DESIGN Retrospective. OBJECTIVE This study assessed the feasibility of combining Oswestry and Neck Disability Index (ODI and NDI) into 1 shorter "Total Disability Index" (TDI) from which reconstructed scores could be computed. SUMMARY OF BACKGROUND DATA ODI and NDI are not pure assessments of disability related to back and neck, respectively.(More)
Achilles tendon pathology is common and affects athletes and nonathletes alike. The cause is multifactorial and controversial, involving biological, anatomical, and mechanical factors. A variety of conditions characterized by Achilles tendon inflammation and/or degeneration can be clinically and histologically differentiated. These include insertional(More)
AIM To investigate the natural history of untreated small (<3 mm) and microscopic pulmonary arteriovenous malformations (PAVMs) in hereditary haemorrhagic telangiectasia (HHT) in order to discern the optimal frequency of follow-up thoracic computed tomography (CT). MATERIALS AND METHODS A retrospective analysis was performed on the follow-up data for(More)
BACKGROUND Total shoulder arthroplasty (TSA) may be associated with substantial blood loss, and some patients require perioperative blood transfusion. Possible blood transfusion methods include predonated autologous blood transfusion, perioperative autologous blood transfusion, and allogeneic blood transfusion (ALBT). The purposes of the present study were(More)
OBJECTIVES To empirically define a "delay" for hip fracture surgery based on clinical outcomes, and to identify patient demographics and hospital factors contributing to surgical delay. DESIGN Retrospective database analysis. SETTING Hospital discharge data. PATIENTS/PARTICIPANTS A total of 2,121,215 patients undergoing surgical repair of hip fracture(More)
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