Abstract：
:Degradation of yttria-stabilized zirconia femoral heads in vivo has been linked to increased roughening and even fracture of the femoral head. To determine whether magnesia-stabilized zirconia is better suited to resist degradation, we characterized the monoclinic phase concentration, surface topography, and microhardness of retrieved zirconia femoral heads. From previous work, we expected yttria-stabilized zirconia heads to undergo considerable tetragonal-to-monoclinic phase transformation in vivo, leading to considerably increased roughness and decreased microhardness, whereas magnesia-stabilized zirconia heads would not experience phase transformation and thus would not roughen or exhibit decreased microhardness. We studied seven yttria-stabilized zirconia and 12 magnesia-stabilized zirconia femoral heads. Yttria-stabilized zirconia heads explanted after 5 years exhibited a rough orange peel-like surface under light microscopy and were rougher than magnesia-stabilized zirconia heads (average roughness approximately 20 nm versus 7.5 nm, respectively), likely attributable to increased mono-clinic phase transformation (approximately 37% by weight) caused by low-temperature aging. The microhardness of yttria-stabilized zirconia heads decreased with age, but the relationship was not noteworthy. In contrast, magnesia-stabilized zirconia retrievals showed no change in monoclinic phase concentration, surface roughness, or microhardness with age. The properties of the yttria-stabilized zirconia evaluated in our study deteriorated in vivo, whereas magnesia-stabilized zirconia did not degrade and appears to be a superior biomaterial for bearing in total joint arthroplasty.
journal_name
Clin Orthop Relat Resjournal_title
Clinical orthopaedics and related researchauthors
Roy ME,Whiteside LA,Katerberg BJ,Steiger JA,Nayfeh Tdoi
10.1097/BLO.0b013e318158b4d3subject
Has Abstractpub_date
2007-12-01 00:00:00pages
220-6eissn
0009-921Xissn
1528-1132journal_volume
465pub_type
杂志文章abstract：:Joint injuries, especially intraarticular fractures, frequently lead to progressive joint degeneration that causes the clinical syndrome of posttraumatic osteoarthritis. Orthopaedists try to prevent this disease by attempting to restore joint congruity, alignment, and stability; however, many patients have crippling j...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章,评审
doi：
更新日期：2004-06-01 00:00:00
abstract：:Numerous studies document vibrations emanating from joints during active or passive motion. It has been proposed these vibrations, termed vibroarthrographic signals, are associated with changes in the shape or quality of tissues in and around the joint. Vibroarthrographic signals in articular joints have been tested t...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1097/BLO.0b013e31802c3423
更新日期：2007-03-01 00:00:00
abstract：:The case report presents a nine-year-old child with an osteoid osteoma of the femoral neck, simulating an inflammatory synovitis. Osteoid osteoma is a common benign bone tumor. However, when intracapsular lesions occur they may pose a diagnostic challenge. Nonspecific clinical signs and symptoms, such as inflammatory ...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1987-10-01 00:00:00
abstract：:From the time of Hippocrates to the beginning of the nineteenth century, fractures of the distal end of the radius were mistaken for dislocations of the wrist. Clinical observations, anatomic dissections, and experiments on cadavers dispelled this error. It was not, however, until after the discovery of roentgenograms...
journal_title：Clinical orthopaedics and related research
pub_type： 传,历史文章,杂志文章
doi：
更新日期：1984-07-01 00:00:00
abstract：:In 15 documented cases, subluxation or dislocation of the hip was discovered months or years after previous multiple normal physical examinations. The examiners were unique in that six were professors specializing in childrens' orthopedics, four were board-certified orthopedists, and five were pediatricians. An increa...
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：:Indwelling prosthetic joints may become colonized by microbial biofilms, although the biofilm structure, composition of the microbial community, and physiologic activity of the organisms in these devices are not well understood. New approaches that rely on the use of fluorescent stain technology can be used to charact...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章,评审
doi：10.1097/01.blo.0000175120.66051.29
更新日期：2005-08-01 00:00:00
abstract：:Primary total hip arthroplasties were performed in 108 patients (116 hips) using a porous coated anatomic (PCA) hip system. Nineteen (22 hips) of 108 patients (116 hips) who had a subsidence of a PCA femoral stem more than 3 mm were studied for the time onset, the amount of stem subsidence, and outcomes. A minimum fol...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1993-10-01 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：:Clonal cell lines of murine osteosarcomas were established and have been maintained in vitro for over a year. By implanting these cultured cells into mice, osteosarcomas, whose histological picutres were exactly the same as those of the original tumors, were easily reproduced. The cultured cells of murine osteosarcoma...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1097/00003086-197511000-00026
更新日期：1975-11-01 00:00:00
abstract：:This report presents an initial clinical experience with arterial embolization as adjuvent therapy in the surgical treatment of selected benign primary bone tumors in childhood. Embolization was dramatically effective in 4 children with spinal or pelvic vascular tumors. This technique facilitated local surgical resect...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1979-03-01 00:00:00
abstract：:The percentage of necrosis in a primary osteosarcoma after the patient has received preoperative chemotherapy is prognostic and is usually used to select subsequent chemotherapy. However, the percentage of necrosis that occurs spontaneously, without preoperative chemotherapy, has not been adequately studied. The exami...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1991-02-01 00:00:00
abstract：:The trauma pandemic disproportionately kills and maims citizens of low-income countries although the immediate cause of the trauma is often an industrial export of a high-income country, such as a motor vehicle. Addressing the trauma pandemic in low-income countries requires access to relevant research information reg...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章,评审
doi：10.1007/s11999-008-0397-y
更新日期：2008-10-01 00:00:00
abstract：:Thirty-two consecutive subtrochanteric fractures in 32 patients were stabilized using the Medoff sliding plate and were followed up prospectively for 1 year. Two patients died during the first postoperative year. Twenty-nine of the remaining 30 (97%) fractures united by 1-year followup. Two types of plate dynamization...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1998-03-01 00:00:00
abstract：:An unusual case of wringer injury in a 29-month-old child demonstrates extensive loss of the diaphysis of both the radius and ulna. Reconstruction consisted of cortico-cancellous autogenous tibial bone grafting of the radius and ulna in two stages. Follow-up of 24 years showed remodeling and good alignment of the enti...
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：BACKGROUND:Low-cost indigenous megaprostheses used in the developing world are prone to mechanical failure but the frequency and causes are not well established. QUESTIONS/PURPOSES:We retrospectively analyzed the causes of failure, particularly design, and suggest changes to reduce the breakage. We also report our exp...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-010-1409-2
更新日期：2010-11-01 00:00:00
abstract：:An improved method of closed irrigation-suction treatment of bone and joint infections is described. The method utilizes a crisscross flow-reversal system using a double tube which prevents obstruction of the tube. A series of 154 patients with acute and chronic bone and joint infections were treated with closed irrig...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1980-05-01 00:00:00
abstract：BACKGROUND:Wound closure accounts for a relatively constant portion of the time required to complete a surgical case. Both longer closure times and wound infections contribute to higher medical costs and patient morbidity. QUESTIONS/PURPOSES:We therefore determined whether (1) biologic and treatment factors greater in...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-012-2524-z
更新日期：2013-03-01 00:00:00
abstract：BACKGROUND:Local drug delivery has substantial potential to prevent infections compared with systemic delivery. Although calcium sulfate (CaSO(4)) has been studied for local drug delivery and two types are commercially available, it is unknown whether they differentially release antibiotics. QUESTIONS/PURPOSES:We dete...
journal_title：Clinical orthopaedics and related research
pub_type：
doi：10.1007/s11999-011-1911-1
更新日期：2011-11-01 00:00:00
abstract：:The authors introduce a new functional classification of rheumatoid arthritis of the wrist. Unlike the classifications used today, it includes the aspect of the natural course of rheumatoid arthritis. The goal of this paper is to identify radiologic indicators that will classify rheumatoid arthritis into stable forms ...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1999-09-01 00:00:00
abstract：:To investigate if an intensive rehabilitation program has a positive influence on the late course of an old, isolated anterior cruciate ligament rupture, patients were evaluated at an average of 8 years after injury. Seventy-five percent had acquired the injury during sporting activities. After diagnostic arthroscopy,...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1097/00003086-199607000-00025
更新日期：1996-07-01 00:00:00
abstract：:The accessory navicular, which is considered an anatomic variant, may be the source of pain in athletes. There are three types of accessory naviculars: Type I is an ossicle in the substance of the posterior tibial tendon; Type II forms a synchondrosis with the navicular; and Type III, "the cornuate navicular," represe...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1986-08-01 00:00:00
abstract：:Augmented reality is a display technique that combines supplemental information with the real world environment. Augmented reality systems are on the verge of being used everyday in medical training, preoperative planning, preoperative and intraoperative data visualization, and intraoperative tool guidance. The basic ...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1097/00003086-199809000-00014
更新日期：1998-09-01 00:00:00
abstract：:Pseudothrombophlebitis syndrome is the occurrence of calf pain and swelling caused by extrinsic compression of the popliteal vessels by an enlarging Baker's cyst or by calf inflammation that occurs as the result of a ruptured Baker's cyst. Few cases of pseudothrombophlebitis syndrome have been reported in patients les...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1994-11-01 00:00:00
abstract：:Thirty-two rabbits were used experimentally to study the effect of cortisone in bone, lungs, kidneys, and liver. Cortisone does induce abnormal increases in the serum cholesterol, fatty metamorphosis of the liver and the fatty emboli of the subchondral vessels of the femoral heads. Clofibrate therapy appeared to modif...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1978-01-01 00:00:00
abstract：:Partial rupture of the distal biceps tendon is a relatively rare event, and various degrees of partial tendon tears have been reported. In the current study four patients with partial atraumatic distal biceps tendon tears (mean age, 59 years; range, 40-82 years) are reported. In all four patients, a common clinical pa...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1097/00003086-200005000-00018
更新日期：2000-05-01 00:00:00
abstract：BACKGROUND:Open reduction and stabilization of dorsal pelvic ring injuries is accompanied by a high rate of soft tissue complications. Minimally invasive techniques have the potential to decrease soft tissue trauma, but the risk of iatrogenic nerve and vessel damage through the reduced surgical exposure should be consi...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-011-1922-y
更新日期：2011-11-01 00:00:00
abstract：BACKGROUND:Reconstruction of the extensor mechanism after resection of the proximal tibia is challenging, and several methods are available. A medial gastrocnemius flap commonly is used, although it may be associated with an extensor lag. This problem also is encountered, although perhaps to a lesser extent, with other...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：10.1007/s11999-013-2851-8
更新日期：2013-07-01 00:00:00
abstract：BACKGROUND:Surgical navigation in TKA facilitates better alignment; however, it is unclear whether improved alignment alters clinical evolution and midterm and long-term complication rates. QUESTIONS/PURPOSES:We determined the alignment differences between patients with standard, manual, jig-based TKAs and patients wi...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章,随机对照试验
doi：10.1007/s11999-011-2044-2
更新日期：2011-12-01 00:00:00
abstract：:Published reports of series of total knee replacements vary between 20% and 75% in the percentage of patients eventually having bilateral replacements. There are no data in the literature on the predicted course of the contralateral knee for patients presenting for total knee replacement. This study reviewed the histo...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1995-12-01 00:00:00
abstract：:Sixty-three complete acromioclavicular separations were treated by 2 operative methods. Acromioclavicular wiring gave 73% acceptable results while wire or Dacron coracoclavicular loop gave 94% acceptable results. Complications, especially broken, bent, or backed-out wires were common with acromioclavicular wiring. Of ...
journal_title：Clinical orthopaedics and related research
pub_type： 杂志文章
doi：
更新日期：1978-01-01 00:00:00
