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Biomedical subjects

Stephen L Ondra

Publications and source records attributed to Stephen L Ondra.

27 records · Page 2Linked to original sources
PubMed2003

Revision strategies for lumbar pseudarthrosis.

Management and avoidance of lumbar pseudarthrosis are among the most common and challenging tasks faced by reconstructive spine surgeons. The risks of pseudarthrosis can be broadly divided into two categories: those within a surgeon's control and those not within his/her control. These include biological factors, graft choices, site preparation, and surgical design. The authors review the biological factors that affect fusion and how they can be manipulated to avoid or manage lumbar pseudarthrosis. Surgical planning and construct design to prevent or treat pseudarthrosis will also be discussed. Additionally, the importance of restoring sagittal balance will be reviewed.

Adrenal Cortex Hormones↗
PubMed2003

Benign sacral tumors.

Primary tumors of the sacrum are rare. In adults, the most common sacral tumors are metastases. The most common primary sacral tumor is a chordoma. Chordomas along as well as tumors such as chondrosarcomas, osteosarcomas, myxopapillary ependymomas, myelomas, and Ewing sarcomas are considered malignant. In this article the authors focus on benign sacral tumors.

Adolescent↗
PubMed2003

Lumbosacropelvic junction reconstruction resulting in early ambulation for patients with lumbosacral neoplasms or osteomyelitis.

Lumbosacropelvic junction instability may result from a variety of disease processes including primary and metastatic sacral tumors and degenerative disease. Regardless of the origin of the disease, restoring or maintaining spinal stability at this junction is essential for normal translation of axial forces from the lumbar spine and sacrum to the pelvis. Spinal stability is also critical for maintaining structural integrity, preventing neurological function deterioration, and alleviating resultant mechanical or axial pain. In this report, the authors describe one option for safe and effective spinal pelvic stabilization by using a transiliac rod and iliac bolt construct, which results in early postoperative ambulation, preserved neurological function, and reduced axial pain in selected patients.

Adenocarcinoma↗
PubMed2003

Muscle flap salvage of spine wounds with soft tissue defects or infection.

STUDY DESIGN: This retrospective study was designed to analyze the results of 22 patients treated for postoperative soft tissue defects of the spine. OBJECTIVE: To demonstrate the utility of flaps in the salvage of spine wounds. SUMMARY OF BACKGROUND DATA: In the literature, the treatment of postoperative spine infections is with serial débridement, antibiotic irrigation catheters, drains, and occasional removal of spinal implants. Muscle flaps have received scant mention in the surgical literature for spine coverage. METHODS: Group 1 (n = 15) had postoperative wound infections or dehiscences. Group 2 (n = 7) had "prophylactic" flaps at the time of their initial spine surgery. The indications for "prophylactic" closure included multiple prior surgeries, prior infection, and previous radiation therapy. Group 1 was treated with drainage, dressing changes, and one-stage flap closure of their wounds. Sliding paraspinal muscle flaps were the flaps of choice. Group 2 was treated with a variety of closure techniques at the time of their initial surgery. RESULTS: The average defect size was 10 vertebral bodies long. Despite the large defect size, 19 of 20 surviving patients currently have healed wounds, and all the patients have maintained their instrumentation. Two patients died of causes unrelated to their wound problems. A Group 1 patient with complete loss of a superior gluteal artery flap was salvaged with a contralateral gluteus muscle flap. Another Group 1 patient has intermittent drainage from under a trapezius flap, which covers a cervical spine fusion. Four patients had minor wound complications. CONCLUSIONS: Flaps are a useful adjunct in the treatment of patients with complex spine wounds. Sliding paraspinal muscle flaps can effectively close wounds from the high cervical to the low lumbar area in one operative procedure. These patients can go on to successful spine fusion.

Adult↗
PubMed2003

Thoracic pedicle screw fixation for spinal deformity.

Techniques to improve segmental fixation have advanced the ability to correct complex spinal deformity. The purpose of instrumentation is to correct spinal deformity or to stabilize the spine to enhance the long-term biological fusion. The ultimate goal of spinal deformity surgery is the creation of a stable, balanced, pain-free spine centered over the pelvis in the coronal and sagittal planes. The minimum number of segments should be fused. These concepts remain challenging in the setting of deformity and instability. Successful results can be obtained if the surgeon understands the technology available, its capabilities, biological limitations, and the desired solution. The authors prefer to use thoracic pedicle screws when treating patients with spinal deformity because they provide greater corrective forces for realignment. This allows shorter-segment constructs and the possibility of true derotation in correction. In this article the authors focus on the use of thoracic transpedicular screw fixation in the management of complex spinal disorders and deformity.

Bone Screws↗
PubMed2002

Neural function preservation and early mobilization after resection of metastatic sacral tumors and lumbosacropelvic junction reconstruction. Report of three cases.

The management of tumors that metastasize to the sacrum remains controversial. Typically, resection of such tumors and reconstruction of the lumbopelvic junction requires sacrifice of neural elements resulting in neurological dysfunction and prolonged periods of bed rest. This severely affects the quality of life in patients in whom there is frequently a limited life expectancy. The authors describe three patients who underwent subtotal resection of metastatic sacral tumors. Postoperatively, good outcome was demonstrated in all patients. The authors present a technique for debulking and reconstruction that provides immediate spinopelvic junction stability and allows for early mobilization. Quality of life is significantly improved compared with that resulting from either medical treatment or traditional surgery.

Early Ambulation↗
PubMed2002

Is laparoscopic anterior lumbar interbody fusion a useful minimally invasive procedure?

OBJECTIVE: Laparoscopic anterior lumbar interbody fusion (LALIF) has been demonstrated to be safe and effective. Its use as a standard surgical technique has been recommended for arthrodesis in the lumbosacral region. We reviewed our experience with LALIF for safety, effectiveness, and usefulness. METHODS: Retrospective review of 14 patients who underwent LALIF was performed. All patients had a diagnosis of degenerative disc disease with medically retractable mechanical back pain. RESULTS: No intraoperative vascular or neurological injury was encountered. An average operating time of 300 minutes with blood loss of 60 ml was found. The average hospital stay was 3.4 days. At 3 to 6 months after surgery, 80% fusion rates were achieved. CONCLUSION: Although LALIF is a safe and effective procedure, it has many disadvantages, which make it a less than optimal procedure for routine use. Other minimally invasive approaches to the anterior lumbar spine result in similar beneficial results without the drawbacks associated with LALIF.

Adult↗