Abstract:
:Standard 5-mm AO Schanz pedicle screws were biomechanically compared with a new design, featuring 6-mm threads with a 5-mm core diameter continuous with the shaft. One each of the two screw designs was surgically inserted into the matching pedicles of 32 cadaveric vertebrae. The pull-out strengths of the screws were then determined by recording the peak force values during extraction under servohydraulic displacement control. The screws were also tested in three-point bending, varying the inner load point with respect to the shaft thread junction, within a clinically anticipated range. The mean pull-out strength for the 6-mm screw was 597 N, which was significantly greater than the mean strength of 405 N for the 5 mm screw (p = 0.002). The 6-mm screw was also stronger in three-point bending, and failed at the point of inner load application, with no evidence of a stress-raising effect at the shaft/thread junction. In contrast, the 5-mm screw withstood lower loads, and failed at the shaft/thread junction, regardless of the point of loading. Pedicle screw breakage and pull-out are the recognized modes of failure of spinal implants, which are dependent on pedicle screw fixation. The results suggest distinct biomechanical advantages for the 6-mm screw, which should be used whenever clinically feasible.
journal_name
J Orthop Traumajournal_title
Journal of orthopaedic traumaauthors
Willett K,Hearn TC,Cuncins AVdoi
10.1097/00005131-199308000-00015subject
Has Abstractpub_date
1993-01-01 00:00:00pages
375-80issue
4eissn
0890-5339issn
1531-2291journal_volume
7pub_type
杂志文章abstract::After completing an orthopaedic trauma fellowship, what challenges will you have as regard to maintaining balance and perspective in your new position in society? How will you view yourself, family, and your profession? These are simple suggestions on maintaining passion for your profession. ...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章,评审
doi:10.1097/BOT.0000000000000431
更新日期:2015-11-01 00:00:00
abstract:OBJECTIVE:To determine the effect of retrograde femoral reaming on the blood flow of the distal femur and the cruciate ligaments. DESIGN:Canine experimental study. SETTING:Tertiary referral and teaching hospital in Toronto, Canada. PARTICIPANTS:Thirteen skeletally mature, cross-bred dogs. MAIN OUTCOME MEASURE:Red c...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/00005131-199805000-00007
更新日期:1998-05-01 00:00:00
abstract::The 2-step closed reduction maneuver was developed to aid in the rarely encountered inferior shoulder dislocation. The maneuver converts the humeral head from an inferior dislocation to an anterior dislocation and then reduces the humeral head into the glenoid. The operator places one hand on the shaft of the humerus ...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/00005131-200605000-00010
更新日期:2006-05-01 00:00:00
abstract::We reviewed the treatment and results of 22 Bennett's fractures. Of these fractures, treated by closed reduction and plaster immobilization, 20 were available for follow-up. Eighteen patients had a subjectively satisfactory outcome, and seven had a radiographically confirmed arthrosis of the first carpometacarpal join...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/00005131-199502000-00004
更新日期:1995-02-01 00:00:00
abstract:OBJECTIVE:To study the activity and incidence of knee pain after sustaining an isolated tibia fracture treated with an infrapatellar intramedullary nail at 1 year. DESIGN:Retrospective review of prospective cohort. SETTING:Multicenter Academic and Community hospitals. PATIENTS:Four hundred thirty-seven patients with...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章,多中心研究
doi:10.1097/BOT.0000000000000475
更新日期:2016-03-01 00:00:00
abstract::Leg length discrepancies can occur despite successful union of femur fractures after intramedullary nailing (IMN). Often, the leg length discrepancy can result in significant disability to the patient, altered gait biomechanics, pelvic obliquity, and pain. Therefore, a successful clinical result for such deformities a...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/BOT.0b013e3181f92d6e
更新日期:2011-11-01 00:00:00
abstract:OBJECTIVES:We investigated the role of negative pressure therapy (NPT) in postoperative primary wound treatment and closure. To date, extensive evidence exists demonstrating the benefit of negative pressure dressings in the treatment of open wounds; our experiment tested the hypothesis that negative pressure dressings ...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/BOT.0b013e318211363a
更新日期:2011-12-01 00:00:00
abstract::A case of open scapulothoracic dissociation with intact neurovascular status in an 8-year-old girl is reported. Scapulothoracic dissociation is a rare injury. Most cases present with significant soft tissue disruption in the shoulder region secondary to separation of the scapula from the thorax, and involve major vasc...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/00005131-198802000-00009
更新日期:1988-01-01 00:00:00
abstract::In March 2016, North American academic leaders with an interest in and commitment to the field of global orthopaedics met in Orlando, Florida, to gauge each institution's clinical, research, and educational programs in developing countries, establish the main limitations to participating in global health efforts, and ...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/BOT.0000000000001288
更新日期:2018-10-01 00:00:00
abstract::Although opioids are widely used for the management of pain in patients with hip fracture, these medications are known to have a wide range of adverse effects that can result in suboptimal outcomes or serious life-threatening complications. Common opioid-related adverse events include gastrointestinal effects, central...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章,评审
doi:10.1097/BOT.0000000000000563
更新日期:2016-05-01 00:00:00
abstract:OBJECTIVES:To determine if distal femoral traction pins result in knee dysfunction in patients with femoral or pelvic fracture, and to determine if skeletal traction relieves pain more effectively than splinting for femoral shaft fractures. DESIGN:Prospective cohort trial. SETTING:Level I urban trauma center. PATIEN...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/BOT.0000000000000202
更新日期:2015-02-01 00:00:00
abstract:OBJECTIVES:To determine preoperative factors predictive of improvement in pain and function following elective implant removal. We hypothesized that patients undergoing orthopaedic implant removal to relieve pain would have significant improvements in both pain and function. DESIGN:Prospective Cohort Study SETTING:: L...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/BOT.0000000000001920
更新日期:2020-10-13 00:00:00
abstract:OBJECTIVES:To compare the accuracy of 5 commonly available fine wire tensioners used in hybrid and ring external fixation. DESIGN:A laboratory investigation. SETTING:The testing of 5 commonly available tensioners was performed with a servohydraulic test frame (MTS Bionix 858, Minneapolis, MN). MAIN OUTCOME MEASUREME...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/00005131-200403000-00006
更新日期:2004-03-01 00:00:00
abstract:OBJECTIVE:To determine the rate of pelvic vein thrombosis following acetabular or pelvic fracture identified by enhanced computed tomography venography or magnetic resonance venography. DESIGN:Prospective evaluation of computed tomography venography and magnetic resonance venography in patients with pelvic and acetabu...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/00005131-200210000-00001
更新日期:2002-10-01 00:00:00
abstract:OBJECTIVES:In the distal femur, locked plating is efficacious when coronal fractures preclude the use of a conventional fixed-angle device. However, minimal comparative data exist for supracondylar fracture patterns, which could be treated with other devices. The purpose of this study was to compare the 95-degree angle...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/BOT.0b013e318234d460
更新日期:2012-06-01 00:00:00
abstract::Over the last several decades, interest in global health across all fields of medicine, including orthopaedic surgery, has grown markedly. Cross-national collaborations are an effective means of conducting high-quality clinical research and offer many advantages over single-center investigations. Successful collaborat...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/BOT.0000000000000466
更新日期:2015-12-01 00:00:00
abstract:UNLABELLED:To determine which of 2 techniques for the treatment of periprosthetic femoral shaft fractures is of greater stiffness. DESIGN:A laboratory study using 8 pairs of matched, embalmed femurs. METHODS:Femurs implanted with a cemented total hip prosthesis had a simulated periprosthetic femur fracture created di...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/01.bot.0000199119.38359.96
更新日期:2006-02-01 00:00:00
abstract:OBJECTIVE:To observe the results and describe the technique of closed reduction and placement of a two-pin supra-acetabular external fixator, followed by immediate weight bearing, in the treatment of displaced vertically stable lateral compression pelvic fractures. DESIGN:Prospective, consecutive. SETTING:Regional tr...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:
更新日期:2006-01-01 00:00:00
abstract:OBJECTIVES:Tibia fractures are the most common long bone fracture. Criteria for closed and open reduction are based on the amount of fracture shortening, angulation, and rotation, with high success rates achieved if acceptable alignment is maintained. However, there exists limited data available regarding the long-term...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/BOT.0000000000000603
更新日期:2016-09-01 00:00:00
abstract:OBJECTIVE:This study tests the bone debridement efficacy and damage to cancellous bone produced by different wound irrigation methods. METHODS:Cancellous bone slices of bovine distal femurs (3 cm x 3 cm) were divided into eight test groups and scored with a saw in a latticed pattern. Four test groups were contaminated...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/BOT.0b013e31802b41e2
更新日期:2006-11-01 00:00:00
abstract:OBJECTIVE:To determine humeral diaphyseal fractures at risk for nonunion with functional brace treatment. DESIGN:Retrospective case series. SETTING:A single surgeon's practice. PATIENTS:Forty-nine of 52 consecutive patients treated nonoperatively for an isolated diaphyseal fracture of the humerus during a 6-year per...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/01.bot.0000249423.48074.82
更新日期:2006-10-01 00:00:00
abstract:OBJECTIVES:Noncompliance with postoperative follow-up visits remains a common problem in orthopaedic trauma. The aim of this study was to identify risk factors for loss of follow-up after orthopaedic trauma. DESIGN:Retrospective review. SETTING:Urban level 1 academic trauma center. PATIENTS:A total of 307 (226 men/8...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/BOT.0000000000000346
更新日期:2015-11-01 00:00:00
abstract::This technique article presents a small-incision, gluteal-splitting approach for the treatment of select fractures involving the posterior acetabulum. The approach essentially involves the proximal portion of the Kocher-Langenbeck incision, and it can be extended to a larger exposure if needed. It is ideally suited fo...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/01.bot.0000211143.70424.f7
更新日期:2006-09-01 00:00:00
abstract:BACKGROUND:Radiographic evaluation of the spine after an acute traumatic event is an integral part of the initial assessment of the patient. Despite this, an imaging protocol that includes detailed recommendations of the views, modalities, and techniques of radiographic work-up is lacking in the peer-reviewed literatur...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章,评审
doi:10.1097/01.bot.0000188036.69078.ef
更新日期:2005-10-01 00:00:00
abstract::The stability of patellar fracture fixation protected with a load-sharing cable was studied in cadavers. A transverse patellar osteotomy was produced and stabilized with standard patellar fixation with or without a figure-of-eight cable that extends from the proximal pole of the patella to the tibial tubercle. Standar...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/00005131-198802030-00010
更新日期:1988-01-01 00:00:00
abstract:OBJECTIVE:The objective of this study was to analyze the appropriateness of transfer of patients with orthopaedic injuries to a Level I trauma center from surrounding Level II to IV centers. DESIGN:A prospective study was conducted over a 5-month period by collecting data on all orthopaedic patients being transferred ...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/BOT.0b013e3181b18b89
更新日期:2010-06-01 00:00:00
abstract:OBJECTIVE:To determine whether the superior sensitivity of computed tomography (CT) results in changes in treatment plans for cervical spine fractures that have been diagnosed on plain films alone. DESIGN:Retrospective review of radiographic studies for cervical spine trauma. SETTING/PARTICIPANTS:An orthopaedic spine...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章
doi:10.1097/00005131-199906000-00003
更新日期:1999-06-01 00:00:00
abstract:OBJECTIVES:Prophylaxis against thromboembolic complications has become routine after major orthopedic surgery. In contrast, it remains an issue for debate whether prophylaxis after minor surgery and immobilization is necessary, even though these treatments are well-known risk factors for deep-vein thrombosis (DVT). The...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章,随机对照试验
doi:10.1097/01.bot.0000250741.65003.14
更新日期:2007-01-01 00:00:00
abstract::Rotational ankle fractures are incredibly common, resulting in a wide spectrum of bony and ligamentous injury patterns. After open reduction of an ankle fracture, the treating surgeon must always evaluate syndesmotic stability. If the syndesmosis is determined to be unstable, a reduction of the distal tibiofibular joi...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章,评审
doi:10.1097/BOT.0000000000000588
更新日期:2016-08-01 00:00:00
abstract::Femoral neck nonunions are a difficult complication in the treatment of femoral neck fractures and have traditionally been managed using an intertrochanteric valgus osteotomy and blade plate. We propose an alternative method, a proximal femoral valgus osteotomy using a sliding hip screw instead of a blade plate. This ...
journal_title:Journal of orthopaedic trauma
pub_type: 杂志文章,评审
doi:10.1097/00005131-200608000-00006
更新日期:2006-07-01 00:00:00