Abstract：
:The magnetic resonance (MR) signal behavior of freshly excised pig femoral heads undergoing ischemic necrosis in vitro was evaluated. Ten femoral heads removed from skeletally immature pigs were stored at 37 degrees in a sealed, sterile container during the observation period. Imaging was initially performed 40 minutes after excision (base-line) and repeated at six, 12, 24, 48, and 72 hours. Changes in MR signal intensity were measured, and the T1 and T2 relaxation times were calculated for selected epiphyseal and metaphyseal areas. Signal intensities decreased during the first 24 hours and returned to baseline by 72 hours. T1 relaxation time increased most significantly between baseline and 24 hours and then decreased to near baseline level between 48 and 72 hours. T2 changes over time were not statistically significant. The type of localized, distinctive decreases in MR signal intensity occurring in clinical cases of early nontraumatic femoral head osteonecrosis was not observed in pigs. Such changes appear to require the presence of an intact and vigorous repair response within adjacent viable bone. However, the transient decrease in signal intensity and prolongation of T1 relaxation time at 12, 24, and 48 hours after traumatic vascular insult may be indicators of early femoral head ischemia.
journal_name
Clin Orthop Relat Resjournal_title
Clinical orthopaedics and related researchauthors
Lang P,Jergesen HE,Genant HK,Moseley ME,Schulte-Mönting Jsubject
Has Abstractpub_date
1989-07-01 00:00:00pages
272-80issue
244eissn
0009-921Xissn
1528-1132pub_type
杂志文章abstract：:The treatment program after anterior cruciate ligament (ACL) injury or reconstruction at the United States Military Academy embraces the four cornerstones of rehabilitation--strength, aerobic fitness, coordination, and confidence. It is divided into six phases--presurgery, to prepare the patient for postoperative reha...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1983-01-01 00:00:00
abstract：:Three typical cases demonstrate the achievement of precision in the reconstruction of ununited fractures of the tibia by preliminary planning with the aid of tracings on roentgenograms, templates, and goniometer measurements. ...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1983-09-01 00:00:00
abstract：:Experience with a 9-year-old girl with Dysplasia Epiphysealis Hemimelica in the right lower extremity demonstrates that avoidance of confusion leading to medical--legal problems and promotion of effective management would have been possible by early recognition of the condition. ...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1976-05-01 00:00:00
abstract：:To investigate the role of blood supply in the pathogenesis of idiopathic osteonecrosis of the femoral head, superselective angiography of the medial circumflex artery was performed. Sixteen hips with early stage osteonecrosis diagnosed by bone scintigraphy were studied, as were 22 contralateral normal hips (from unil...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1992-04-01 00:00:00
abstract：:From July 1984 through October 1987, 63 consecutive primary Porous Coated Anatomic total hip arthroplasties were performed. Follow-up observation ranged from one to four years, with a mean of 2.4 years. The mean postoperative Harris hip score in 81 cases was 38% excellent results, 23% good results, 6% fair results, an...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1992-05-01 00:00:00
abstract：:A new spinal implant has been designed and biomechanical testing completed, intended for application to "short-segment" spinal defects such as disc degeneration, fracture, spondylolisthesis, or tumor. Major improvements over currently available devices include: only 2-3 vertebrae are spanned, not 5-7 as with Harringto...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1986-02-01 00:00:00
abstract：:Mini-incision total knee arthroplasty can be accomplished through versions of exposures used in standard total knee arthroplasty. Modifications of the medial parapatellar, subvastus, and midvastus approaches are presented, and potential advantages and disadvantages of each approach are reviewed. When making the transi...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章,评审
doi：10.1097/01.blo.0000148574.79874.d0
更新日期：2004-11-01 00:00:00
abstract：BACKGROUND:Most contemporary total disc replacements (TDRs) use conventional orthopaedic bearing couples such as ultrahigh-molecular-weight polyethylene (polyethylene) and cobalt-chromium (CoCr). Cervical total disc replacements incorporating polyetheretherketone (PEEK) bearings (specifically PEEK-on-PEEK bearings) hav...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-016-5041-7
更新日期：2016-11-01 00:00:00
abstract：:A series of 131 comminuted fractures of the femoral shaft in 123 patients were externally fixed by the ASIF plating method. Of the 126 fractures in 118 patients, that could be reviewed one to 3 years postoperatively, 115 of 92% presented a good functional result. The most common complication was a fatigue fracture of ...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1979-01-01 00:00:00
abstract：:Stress fracture of the patella can occur with significant frequency following patellar replacement with the duopatellar knee prosthesis. In the first 372 knees with patellar resurfacing, the incidence was 0.7% in rheumatoid arthritis (2 fractures in 286 knees) and 3.5% in osteoarthritis (3 fractures in 86 knees). The ...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1982-10-01 00:00:00
abstract：BACKGROUND:In clinical trials of THA, model-based radiostereometric analysis (RSA) techniques may be less precise than conventional marker-based RSA for measurement of femoral stem rotation. We verified the accuracy and clinical precision of RSA based on computer-aided design models of a cementless tapered wedge femora...
journal_title：Clinical orthopaedics and related research
pub_type： 临床试验,杂志文章
doi：10.1007/s11999-016-4930-0
更新日期：2016-10-01 00:00:00
abstract：:Since 1941, distal clavicle excision has been a reliable technique for alleviating pain caused by acromioclavicular joint arthritis. Disadvantages of the procedure include permanent shoulder weakness, a lengthy recovery time ranging from weeks to months before useful function of the extremity returns, and lack of cosm...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1994-04-01 00:00:00
abstract：:Of 84 fracture dislocations of the hip reviewed, 73 were posterior fracture dislocations, nine were central, and two were obturator. Fifty-five were followed from one to 30 years (average, 4 1/2 years). The patients' ages ranged from three to 83 years (average, 33.1 years). All had primary attempt at closed reduction,...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1987-01-01 00:00:00
abstract：:Subspecialty certification in hand surgery was instituted in 1989 by the collaborative efforts of the American Boards of General Surgery, Plastic Surgery, and Orthopaedic Surgery. Candidates must be certified by their parent board and have demonstrated qualifications in hand surgery beyond those expected of other Boar...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章,评审
doi：10.1097/01.blo.0000224041.77215.b6
更新日期：2006-08-01 00:00:00
abstract：:The treatment of osteonecrosis of the hip remains a dilemma. Contemporary basic science research focuses on establishing the molecular etiology of this disease with the hope of identifying targets for pharmacologic intervention. Researchers have identified specific genetic polymorphisms that may predispose its develop...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章,评审
doi：10.1097/BLO.0b013e3181591c92
更新日期：2007-12-01 00:00:00
abstract：:The reliability of a closed double helix electrode in the lower limbs was studied. This electrode is an implanted intramuscular electrode and is used for a totally implantable functional electrical stimulation system. Eighty electrodes were evaluated retrospectively with a mean period of 15 months. The total implant t...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1998-01-01 00:00:00
abstract：:Major vascular, nonthromboembolic complications of total hip arthroplasty are rare: only 23 have been reported over the last 20 years. This is a report of two additional cases. In an 84-year-old woman, the external iliac artery was lacerated following removal of the acetabular component. Two such injuries have been re...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1984-06-01 00:00:00
abstract：BACKGROUND:Patients with symptomatic residual Perthes-like deformities may present with a combination of structural abnormalities including a large aspheric femoral head, short and wide femoral neck, high greater trochanter, and acetabular dysplasia. Sometimes, the hip is further compromised by concurrent symptomatic f...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-014-4115-7
更新日期：2015-04-01 00:00:00
abstract：BACKGROUND:Total hip arthroplasty (THA) has been associated with high survival rates, but debate remains concerning the best fixation mode of THA. QUESTIONS/PURPOSES:We conducted a randomized controlled trial (RCT) with 250 patients with a mean age of 64 years between October 1987 and January 1992 to compare the resul...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章,随机对照试验
doi：10.1007/s11999-010-1459-5
更新日期：2011-01-01 00:00:00
abstract：:In view of the increasing incidence of stem-type femoral component loosening, a detailed retrospective radiographic zonal analysis of 389 total hip replacements indicated a 19.5% incidence (76 hips) of radiological evidences of mechanical looseness, i.e., fractured acrylic cement and/or a radiolucent gap at the stem-c...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1979-06-01 00:00:00
abstract：:A 7- to 9-month protocol of prophylactic transfusion was used to treat 33 joints in 19 children with severe hemophilia (< 1 U/dL Factors VIII or IX) and hypertrophic synovitis. The overall rate of hemarthrosis was reduced, but only 36% (12 of 33 joints) achieved a good result (defined as 0-0.5 bleeding episodes per mo...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1997-10-01 00:00:00
abstract：:Developing and maintaining outcomes for total hip arthroplasty, resulting in meaningful and usable data, presents many challenges for today's clinician. Outcomes data collected must show patients' clinical, functional, and overall quality of life status. Data also must be appropriate to illustrate efficiency, effectiv...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1997-11-01 00:00:00
abstract：:Hip arthroscopy has obvious advantages over arthrotomy in the pediatric population. Hip arthroscopy, used as a diagnostic or therapeutic tool, is significantly less invasive than arthrotomy and allows for quicker recovery and return to activities. In addition, arthroscopy avoids dislocation of the femoral head and the...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章,评审
doi：10.1097/01.blo.0000043044.84315.90
更新日期：2003-01-01 00:00:00
abstract：:We present two clinical cases and four museum specimens of a type of lateral clavicle fracture dislocation that has not been detailed in any of the commonly accepted classification systems. With this injury, the major clavicular element is displaced downward and backward into the supraspinatus outlet and may cause sym...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1097/01.blo.0000176555.05105.df
更新日期：2005-10-01 00:00:00
abstract：:Fifty-six adults (average age, 38 years) with active tuberculosis of the lumbar and lumbosacral spine were treated conservatively with triple chemotherapy for 12 to 18 months. The minimum followup was 3 years. Three methods of assessments of the chronologic changes of sagittal spinal deformity were used on lateral rad...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1097/00003086-200205000-00007
更新日期：2002-05-01 00:00:00
abstract：:Muscle transplantation in deltoid paralysis in poliomyelitis has been practiced only sporadically and considered ineffective. Trapezius transfer to humeral shaft with fascia lata extension was performed to restore abduction power of the shoulder in 24 patients between 4--10 years of age. It is recommended that the mus...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1978-09-01 00:00:00
abstract：:Soft tissue structures can be replaced by a filamentous carbon-polylactic acid polymer tissue scaffold. A successful replacement requires a secure bond between the synthetic material and living soft tissue. This attachment has been investigated in a rabbit model. In 23 male, white New Zealand rabbits, the proximal thi...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1981-10-01 00:00:00
abstract：:Forty patients were studied retrospectively to evaluate the effect of epidural steroid injections on low back pain and sciatica characteristic of spinal stenosis or a herniated lumbar disc. All but one of these patients had radicular symptoms. The average age was 55 years, and the average follow-up time was eight mont...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1988-03-01 00:00:00
abstract：:A human osteosarcoma cell line, HuO9, was established from a tumor that was heterotransplanted into athymic nude mice. Antiserum against nude mouse spleen cells was added to the early passage cultures to eliminate the host fibroblastic cells. The cell line retained a high activity of liver/bone/kidney-type alkaline ph...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1990-10-01 00:00:00
abstract：:Movement between screw threads and bone inhibits bone formation, revascularization and remodeling of dead bone. Movement causes the screw to become enveloped by fibrous tissue in response to necrosis and resorption of adjacent dead cortical bone. This results in a radiologically discernible radiolucent "halo" about th...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1097/00003086-197509000-00032
更新日期：1975-09-01 00:00:00
