Search Results

You are looking at 1 - 10 of 531 items for :

  • "sagittal alignment" x
  • All content x
Clear All
Restricted access

Ryan Snowden, Justin Miller, Tome Saidon, Joseph D. Smucker, K. Daniel Riew, and Rick Sasso

have shown that arthroplasty compares favorably to ACDF and shows superiority in a variety of outcome measures. 1 , 2 , 6 , 9 , 29 , 34 However, long-term improvements in patients with CASP and RASP have been varied. 8 , 12 , 19 , 23 , 25 , 31 , 32 The development of RASP is likely a combination of both natural history and changes in biomechanical factors. More recently, a greater emphasis has been placed on the maintenance of sagittal alignment following TDA and ACDF. Loss of this balance has been identified as a risk factor for both RASP and CASP, increasing neck

Full access

Ming-Qiao Fang, Chong Wang, Guang-Heng Xiang, Chao Lou, Nai-Feng Tian, and Hua-Zi Xu

coronal plane. However, the other 3D parameters are of primary importance, because it is mandatory to stabilize the coronal plane without creating adverse effects on sagittal alignment and transverse plane parameters. Many brace-related concepts have resulted in good correction but have had a deleterious effect on the sagittal profile, which may be related to the production of lumbar and thoracic flat back. The Chêneau system was designed with the principles of 3D correction in mind. The anterior pad pushes the lumbar and thoracic regions backward to fight posterior

Full access

Emmanuelle Ferrero, Barthelemy Liabaud, Jensen K. Henry, Christopher P. Ames, Khaled Kebaish, Gregory M. Mundis, Richard Hostin, Munish C. Gupta, Oheneba Boachie-Adjei, Justin S. Smith, Robert A. Hart, Ibrahim Obeid, Bassel G. Diebo, Frank J. Schwab, and Virginie Lafage

timing of revision surgery (up to 2 years postoperatively). Radiographic Measurement Radiographs were analyzed using validated software (Spineview, ENSAM Paris-Tech). 34 Sagittal spinopelvic radiographic parameters included cervical lordosis, T2–12 thoracic kyphosis (TK), LL, PI-LL mismatch, and pelvic parameters (PI, PT, and sacral slope). 46 Global sagittal alignment parameters included SVA and T-1 spinopelvic inclination (T1SPi) ( Fig. 1 ). The 3CO resection angle was defined as the change in the angle formed by the upper endplate of the vertebra below the 3CO and

Full access

Jae Hwan Cho, Chang Ju Hwang, Young Hyun Choi, Dong-Ho Lee, and Choon Sung Lee

surgery on cervical sagittal alignment (CSA) is not clearly defined. Cervical lordosis has been reported to decrease following corrective surgery in patients with Lenke type 1 AIS. 6 In addition, the cervical spine may tend to decompensate independent of the surgical technique. 14 However, there have been varied opinions on postoperative CSA. Reportedly, the effect of corrective surgery on CSA may be determined based on the preoperative thoracic sagittal profile, 18 that is, cervical lordosis improves postoperatively in patients with preoperative hypokyphosis

Restricted access

Chong-Suh Lee, Jin-Sung Park, Yunjin Nam, Youn-Taek Choi, and Se-Jun Park

potentially be related to mechanical failures such as rod fractures and proximal junctional kyphosis (PJK), although a solid consensus has not been yet reached. Some authors have suggested that failure to restore optimal sagittal alignment increases the risk of rod fracture and have concluded that appropriately corrected sagittal alignment is important to prevent pseudarthrosis and subsequent rod fractures. 14–16 Controversy also exists in regard to the relationship between optimal sagittal alignment and PJK development. Yagi et al. reported inappropriate global sagittal

Restricted access

Jee-Soo Jang, Sang-Ho Lee, Jun-Hong Min, and Dae Hyeon Maeng

generate adequate lumbar lordosis. 13 , 15 All patients in the present study underwent a combined anterior and posterior surgical approach to restore lumbar lordosis without the use of posterior wedge osteotomy. There were four operation-related complications in this study as follows: incision abdominal hernia (in two patients), screw malposition (in one patient), and radiculopathy that required revision surgery (one patient). Conclusions Lower lumbar lordosis plays an important role in sagittal alignment and balance. Surgical restoration of lower lumbar lordosis

Free access

Roland D. Donk, Michael G. Fehlings, Wim I. M. Verhagen, Hisse Arnts, Hans Groenewoud, André L. M. Verbeek, and Ronald H. M. A. Bartels

spine correctly. A comparison between a quantitative assessment of the sagittal alignment of the cervical spine with the actual angle measured by the posterior tangent method has never been performed. A clear definition of the shape of the cervical spine is of interest for clinical use, but also for research purposes. In this study we compared the quantification of the angle between C-2 and C-7 by using Harrison's posterior tangent method, with a quantitative assessment of the curve performed using the modified Toyama method. Methods The study was approved by the

Full access

Themistocles S. Protopsaltis, Justin K. Scheer, Jamie S. Terran, Justin S. Smith, D. Kojo Hamilton, Han Jo Kim, Greg M. Mundis Jr., Robert A. Hart, Ian M. McCarthy, Eric Klineberg, Virginie Lafage, Shay Bess, Frank Schwab, Christopher I. Shaffrey, Christopher P. Ames, and International Spine Study Group

A dult spinal deformity has been studied extensively in the literature with a majority of publications focusing on thoracolumbar deformity and its effect on health-related quality of life (HRQOL) measures. 1 , 3 , 6 , 7 , 10 , 11 , 13 , 14 , 16 , 17 Among patients with thoracolumbar deformities, positive sagittal alignment has been associated with pain and disability. 2 , 7 , 11 , 13 , 16 Few studies have correlated validated health measures and positive cervical sagittal alignment. 16 , 17 Tang et al. 16 demonstrated that a C2–7 sagittal vertical axis

Restricted access

Richard D. Ferch, Amjad Shad, Tom A. D. Cadoux-Hudson, and Peter J. Teddy

T he sagittal alignment of the spine can be altered by diseases affecting the spine or following spinal surgery. The loss of normal cervical lordosis associated with the development of a kyphotic deformity can be progressive. This may lead to adjacent-segment disease and the development of neurological deficit. 36 Biomechanical interactions facilitate this development of progressive deformity, resulting in a bowstring effect on the cord that may compromise its function despite the presence of an adequate canal diameter. 2, 4, 19 Anterior decompression of

Restricted access

Yong-Chan Kim, Ji Hao Cui, Ki-Tack Kim, Gyu-Taek Park, Keun-Ho Lee, Sung-Min Kim, and Lawrence G. Lenke

M any studies on sagittal balance in humans in the standing position have been published, 1 , 6 , 10 , 11 , 36 and sagittal imbalance is known to be a major cause of pain and disability in spine deformity patients. 7 However, most of these studies have focused primarily on the thoracolumbar spine and pelvis. 1 , 2 , 6 , 8 , 9 , 31 , 32 , 35 Recently, the importance of integrating the head and cervical spine in the evaluation of sagittal alignment has begun to be recognized. 18 , 34 Simplistically, the goal of spinal deformity correction is to keep the head