Search Results

You are looking at 1 - 10 of 40 items for :

  • By Author: Ames, Christopher P. x
Clear All
Restricted access

Christopher P. Ames, G. Bryan Cornwall, Neil R. Crawford, Eric Nottmeier, Robert H. Chamberlain and Volker K. H. Sonntag

rigidity of the plate (anterior tension band forces) and screw—plate interface (cantilever forces) was also further decreased with time. The design allowed for acute subsidence via screw toggling and chronic subsidence via resorption-induced material weakening. Although it is unlikely that the polyactide polymer plate will be as rigid as metallic plates in all loading modes, for one-level discectomies performed for degenerative disease, significant hardware rigidity may not be necessary or even desirable. A less rigid construct such as the resorbable plate, which still

Restricted access

Christopher P. Ames, Frank Acosta and Eric Nottmeier

been reported that a chronically untreated Jefferson-type fracture can result in basilar invagination. 2 Typically basilar invagination associated with C1–2 ligamentous instability has been treated with occipitocervical fusion, which results in significant loss of cervical motion. We present a second case of basilar invagination caused by an untreated C-1 fracture associated with transverse ligament rupture. In addition, we describe a new treatment for this type of sagittal and vertical instability, based on the biomechanical mechanism of the cranial settling, that

Restricted access

Kurtis I. Auguste, Cynthia Chin, Frank L. Acosta and Christopher P. Ames

the means ± standard deviations. Results Clinical Results Patients underwent follow up for a mean period of 22 months (range 18–34 months). Seven patients underwent one-level corpectomy, 13 underwent two-level corpectomy, and two underwent three-level corpectomy ( Table 1 ). Fourteen patients underwent combined anterior–posterior fusion. Twelve patients underwent additional posterior decompression. One patient with a chronic fixed-type kyphotic deformity underwent a same-day 540° fusion. The patient with spondylotic myelopathy, a kyphotic deformity, and a

Restricted access

Henry E. Aryan, C. Benjamin Newman, Eric W. Nottmeier, Frank L. Acosta Jr., Vincent Y. Wang and Christopher P. Ames

–2 joint. Clinical Material and Methods This study was retrospective and multicenter in nature. The 3 institutions that participated were the University of California, San Francisco Medical Center; the University of California, San Diego Medical Center; and the Mayo Clinic in Jacksonville, Florida. All patients were treated between 2001 and 2007 at 1 of the 3 institutions. Institutional review board approval was obtained. The indication for surgery was instability at the C1–2 level, and a chronic Type II odontoid fracture was the most frequent underlying cause

Restricted access

Vincent Y. Wang, Henry Aryan and Christopher P. Ames

tested in the upper and lower extremities. The patient had significant comorbidities including chronic obstructive pulmonary disease, prior stroke and myocardial infarction, and congestive heart failure. F ig . 1. Preoperative images. Anteroposterior (A) and lateral (B) radiographs show significant kyphotic and scoliotic deformity. Reconstructed coronal (C) and sagittal (D) computed tomography scans show osseus fusion of the lateral masses of multiple levels and C5–6 vertebral bodies along with instrumentation fusion of C3–4 (anterior) and C2–3 (posterior

Restricted access

Atul Goel

were instability at the C1–2 level, and a chronic Type II odontoid fracture was the most frequent underlying cause. All patients had evidence of instability on flexion and extension studies. All underwent posterior C-1 lateral mass to C-2 pedicle or pars screw fixation, according to the method of Harms. Thirty-nine patients also underwent distraction and placement of an allograft spacer into the C1–2 joint, the authors' modification of the Harms technique. None of the patients had supplemental sublaminar wiring. Results All but 2 patients with at least a 12

Restricted access

Matthew C. Tate, Anurahda Banerjee, Scott R. Vandenberg, Tarik Tihan, John H. Chi, Christopher P. Ames and Andrew T. Parsa

were not observed on a repeat CT scan of the chest ( Fig. 4D–F ), suggesting that the C-3 lesion was, in fact, a result of posttreatment reactive changes and that the C-3 and lung lesions were not metastases. The patient has undergone biannual follow-up MR imaging of her brain and spine, most recently at 2 years following her spine surgery for the C-3 lesion. At that time, there was no evidence of brain or spinal recurrence, and her vertebral bodies were notable only for postoperative changes. Her hypothyroidism (likely related to radiation therapy), chronic foot

Restricted access

Jordan M. Cloyd, Frank L. Acosta Jr., Colleen Cloyd and Christopher P. Ames

including principal diagnosis, previous spine surgeries (if any), medical comorbidities, and smoking status was obtained. Comorbidities were predefined and included hypertension, hyperlipidemia, coronary artery disease, congestive heart failure, chronic obstructive pulmonary disease, gastroesophageal reflux disease/peptic ulcer disease, diabetes mellitus, liver disease, renal disease, thyroid disease, arthritis, AIDS, and depression. Operative data that were recorded included proximal and distal levels fused, type of procedure, operative time, EBL, LOS, and ASA class

Restricted access

Kai-Ming G. Fu, Justin S. Smith, David W. Polly Jr., Christopher P. Ames, Sigurd H. Berven, Joseph H. Perra, Richard E. McCarthy, D. Raymond Knapp Jr. and Christopher I. Shaffrey

P atients seeking treatment from spine surgeons may present with complex medical comorbidities, which can complicate surgical decision making. 8 Often, surgeons approach with caution patients with significant medical comorbidities, but there are few reports that specifically evaluate risk stratification mechanisms for spine surgery. In other surgical disciplines, several different risk stratification schemes, such as APACHE II (Acute Physiology and Chronic Health Evaluation II) and POSSUM (Physiological and Operative Severity Score for the Enumeration of

Restricted access

Jon Park, Justin K. Scheer, T. Jesse Lim, Vedat Deviren and Christopher P. Ames

usually chronic instability. Screw distraction alone to reduce the deformity, in the albescence of graft placement, would create an empty gap at the joint space, which would be less stable. Moreover, in cases of acute traumatic disruption, the distraction inherent in the application of this technique would not be necessary and might be dangerous. Placement of these cages may require resection of the C-2 nerves, which is a controversial topic in the field. In routine cases, sacrifice of the C-2 nerves is not required, but in complex deformities of the C1–2 complex, C-2