The Journal of Bone & Joint Surgery最新文献

{"title":"Refractures in Patients at Least Forty-five Years Old: A Prospective Analysis of Twenty-two Thousand and Sixty Patients","authors":"C. Robinson, M. Royds, A. Abraham, M. McQueen, C. Court-Brown, J. Christie","doi":"10.2106/00004623-200209000-00004","DOIUrl":"https://doi.org/10.2106/00004623-200209000-00004","url":null,"abstract":"Background: Individuals who sustain a low-energy fracture are at increased risk of sustaining a subsequent low-energy fracture. The incidence of these refractures may be reduced by secondary preventative measures, although justifying such interventions and evaluating their impact is difficult without substantive evidence of the severity of the refracture risk. The aim of this study was to quantify the risk of sustaining another fracture following a low-energy fracture compared with the risk in an age and sex-matched reference population.Methods: During the twelve-year period between January 1988 and December 1999, all inpatient and outpatient fracture-treatment events were prospectively audited in a trauma unit that is the sole source of fracture treatment for a well-defined local catchment population. During this time, 22,060 patients at least forty-five years of age who had sustained a total of 22,494 low-energy fractures of the hip, wrist, proximal part of the humerus, or ankle were identified. All refracture events were linked to the index fracture in the database during the twelve-year period. The incidence of refracture in the cohort of patients who had sustained a previous fracture was divided by the \"background\" incidence of index fractures within the same local population to obtain the relative risk of refracture. Person-years at-risk methodology was used to control for the effect of the expected increase in mortality with advancing age.Results: Within the cohort, 2913 patients (13.2%) subsequently sustained a total of 3024 refractures during the twelve-year period. Patients with a previous low-energy fracture had a relative risk of 3.89 of sustaining a subsequent low-energy fracture. The relative risk was significantly increased for both sexes, but it was greater for men (relative risk = 5.55) than it was for women (relative risk = 2.94). The relative risk was 5.23 in the youngest age cohort (patients between forty-five and forty-nine years of age), and it decreased with increasing age to 1.20 in the oldest cohort (patients at least eighty-five years of age).Conclusions: Individuals who sustain a low-energy fracture between the ages of forty-five and eighty-four years have an increased relative risk of sustaining another low-energy fracture. This increased risk was greater when the index fracture occurred earlier in life; the risk decreased with advancing age. Secondary preventative measures designed to reduce the risk of refracture following a low-energy fracture are likely to have a greater impact on younger individuals.","PeriodicalId":22625,"journal":{"name":"The Journal of Bone & Joint Surgery","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82862716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Periprosthetic Humeral Fractures After Total Elbow Arthroplasty: Treatment with Implant Revision and Strut Allograft Augmentation","authors":"J. Sánchez-Sotelo, S. O’Driscoll, B. Morrey","doi":"10.2106/00004623-200209000-00019","DOIUrl":"https://doi.org/10.2106/00004623-200209000-00019","url":null,"abstract":"Background: Periprosthetic fractures are among the most challenging complications of elbow arthroplasty, and published information about the outcome of treatment is limited. The purpose of the present study was to determine the results of implant revision and strut allograft augmentation for the treatment of humeral periprosthetic fractures that occur around a loose humeral component.Methods: Between 1991 and 1999, eleven periprosthetic fractures that occurred around a loose humeral component were treated with cortical strut allograft augmentation and revision arthroplasty with use of a Coonrad-Morrey semiconstrained implant. Six fractures occurred after a primary arthroplasty, and five occurred after a revision arthroplasty. Two parallel strut grafts were used for fracture fixation in most cases. Patients were followed for an average of three years (range, nine months to 7.8 years) and were evaluated clinically and radiographically.Results: Clinical and radiographic fracture union was obtained in ten of the eleven patients. One patient required revision surgery because of aseptic loosening of the humeral component seven years and nine months after fracture union; there were no other implant failures. Complications included one additional nondisplaced humeral periprosthetic fracture after surgery that failed to heal with closed treatment, one olecranon fracture, one permanent ulnar nerve injury, and one case of triceps insufficiency. At the time of the most recent follow-up, seven of the eight patients with an intact reconstruction had a functional arc of motion and no or slight pain and one had limited motion and moderate pain.Conclusions: Periprosthetic humeral fractures that are associated with a loose humeral component can be effectively treated with revision elbow arthroplasty and strut allograft augmentation. The technique is associated with a high rate of fracture union, implant survival, and satisfactory clinical results. However, the complication rate is substantial.","PeriodicalId":22625,"journal":{"name":"The Journal of Bone & Joint Surgery","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88482742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ice Reduces Edema: A Study of Microvascular Permeability in Rats","authors":"D. Deal, J. Tipton, E. Rosencrance, W. Curl, Thomas L. Smith","doi":"10.2106/00004623-200209000-00009","DOIUrl":"https://doi.org/10.2106/00004623-200209000-00009","url":null,"abstract":"Background: Ice is applied following a soft-tissue injury on the basis of clinical information. This study investigates the relationship between ice therapy (cryotherapy) and edema by determining microvascular permeability before and after contusion with and without ice therapy and provides data supporting a reduction in edema following cryotherapy.Methods: A dorsal microvascular chamber was created in rats to allow the direct examination of microvascular parameters in intact, pre-established microvascular beds of the cutaneous maximus muscle in conscious rats. The rats received a contusion or sham contusion and were treated with cryotherapy or were not treated. Microvascular permeability (edema) was assessed by measuring fluorescent-labeled albumin in the interstitial fluid before and after contusion.Results: Microvascular permeability following contusion was significantly increased in the group that received the contusion without cryotherapy compared with that in the group that received the sham contusion without cryotherapy (control) (p < 0.001). When ice was applied fifteen minutes after the contusion for twenty minutes, microvascular permeability (edema) decreased significantly (p < 0.001) compared with that in the group that did not receive cryotherapy after contusion. Permeability was increased in the group that received cryotherapy following the contusion compared with that in the control group (p = 0.012), although the increase was not as great as that between the group that received the contusion without cryotherapy and the control group. Sham contusion with cryotherapy significantly reduced microvascular permeability compared with that in the control group (p = 0.004). Sham contusion without cryotherapy did not cause a significant change in the microvascular permeability of postcapillary venules after 300 minutes compared with baseline measurements.Conclusions: The application of ice significantly decreased microvascular permeability following striated muscle contusion. The results of this study demonstrated that microvascular permeability is increased following a contusion coincident with significant leukocyte-endothelial interactions. However, microvascular permeability was significantly reduced following cryotherapy, a treatment demonstrated to reduce the number of rolling and adherent leukocytes. This association suggests that the reduction in edema in injured skeletal muscle following cryotherapy may be due to a reduction in leukocyte-endothelial interactions.Clinical Relevance: This study provides scientific data to support the clinical observation that ice reduces edema.","PeriodicalId":22625,"journal":{"name":"The Journal of Bone & Joint Surgery","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82617989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prospective Reevaluation of the Association Between Thrombotic Diathesis and Legg-Perthes Disease","authors":"M. Hresko, P. McDougall, J. Gorlin, E. Vamvakas, J. Kasser, E. Neufeld","doi":"10.2106/00004623-200209000-00014","DOIUrl":"https://doi.org/10.2106/00004623-200209000-00014","url":null,"abstract":"Background: Legg-Perthes disease is associated with ischemia of the capital femoral epiphysis in children. Thrombophilia has been implicated as a potential cause of the condition, and screening of patients with Legg-Perthes disease for thrombophilia has been recommended. We analyzed the value of screening for inherited thrombophilia in patients with Legg-Perthes disease by examining the association between Legg-Perthes disease and abnormalities in the thrombotic pathway.Methods: A random series of consecutive patients with Legg-Perthes disease were prospectively enrolled in this study. Assays for the detection of factor-V Leiden mutation and the plasma concentrations of protein C, protein S, antithrombin III, and lipoprotein (a) were performed on plasma samples from children with Legg-Perthes disease, and the results were compared with those for pooled plasma from normal controls. Plasma concentrations below the 95% midrange of the control values were classified as protein deficiencies. The estimated population frequency of each coagulation abnormality was compared with the proportion of the study group with the corresponding abnormality.Results: The proportion of abnormalities observed in the study group did not differ from the estimated population frequency for protein C, protein S, antithrombin III, or factor-V Leiden mutation. A lipoprotein (a) level of >30 mg/dL (>1.07 &mgr;mol/L) was found in 16% of the study group.Conclusions: Our data do not suggest that thrombotic diatheses due to deficiency of protein C, protein S, or antithrombin III or due to factor-V Leiden mutation are major causes of Legg-Perthes disease. The elevated levels of lipoprotein (a) in children with Legg-Perthes disease suggest that they may be at risk for atherosclerosis as adults.","PeriodicalId":22625,"journal":{"name":"The Journal of Bone & Joint Surgery","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80619173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Biomechanical Analysis of Fixation of Intra-Articular Distal Radial Fractures with Calcium-Phosphate Bone Cement","authors":"T. Higgins, S. Dodds, S. Wolfe","doi":"10.2106/00004623-200209000-00010","DOIUrl":"https://doi.org/10.2106/00004623-200209000-00010","url":null,"abstract":"Background: Calcium phosphate cement has been used to treat unstable fractures of the distal end of the radius with the intent of avoiding the stiffness and morbidity associated with prolonged immobilization in a cast or external fixation. The purpose of this study was to compare the stability of the fracture fragments after fixation with augmented calcium phosphate cement with that after alternative methods of percutaneous fracture treatment.Methods: Both an osteotomy and osteoclasis were used to create a model of an intra-articular fracture of the distal part of the radius (AO type C2) with dorsal bone loss in seven pairs of fresh-frozen upper extremities. One wrist from each pair was fixed with an external fixator and three Kirschner wires, and the contralateral wrist was fixed with calcium phosphate cement (Norian SRS) and three Kirschner wires (augmented calcium phosphate cement). Sequentially increasing loads, up to a total of 100 N, were then applied to the major flexors and extensors of the wrist. Fracture fragment motion was measured by the Optotrak three-dimensional system.Results: Fixation with cement alone failed at the bone-cement interface at <80 N in all specimens. With use of an analysis of variance, augmented external fixation was found to provide significantly increased stability to the radial fragment compared with that provided by augmented calcium phosphate cement in four of the six axes tested (e.g., mean motion [and standard deviation] in flexion-extension was 3.0° ± 2.93° versus 11.1° ± 13.08°, respectively; p = 0.001). Augmented calcium phosphate cement was found to provide greater stability for the radial fragment than were Kirschner wires alone in three axes (e.g., mean motion in flexion-extension was 11.1° ± 13.08° versus 36.5° ± 13.03°, respectively; p = 0.001).Conclusions: Calcium phosphate cement alone is insufficient to withstand physiologic flexion-extension motion of the wrist without supplemental wire fixation. When supplemented with Kirschner wires, fixation with bone cement is more stable than are Kirschner wires alone, but it is significantly less stable than augmented external fixation.Clinical Relevance: When performing studies of fracture fixation strengths, it is essential to simulate the shear and rotational forces encountered during normal wrist motion. On the basis of the physiologic biomechanical testing in this study, we recommend supplemental fixation if calcium phosphate cement is chosen for fixation of unstable distal radial fractures.","PeriodicalId":22625,"journal":{"name":"The Journal of Bone & Joint Surgery","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89416517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anterior Cruciate Ligament Replacement: Comparison of Bone-Patellar Tendon-Bone Grafts with Two-Strand Hamstring Grafts A Prospective, Randomized Study","authors":"B. Beynnon, R. Johnson, B. Fleming, P. Kannus, M. Kaplan, J. Samani, P. Renström","doi":"10.2106/00004623-200209000-00001","DOIUrl":"https://doi.org/10.2106/00004623-200209000-00001","url":null,"abstract":"Background: The purpose of this investigation was to evaluate replacement of a torn anterior cruciate ligament with either a bone-patellar tendon-bone autograft or a two-strand semitendinosus-gracilis autograft to compare the results of clinical testing, patient satisfaction, activity level, functional status, and muscle strength.Methods: Fifty-six patients with a torn anterior cruciate ligament were enrolled in a prospective, randomized, controlled study. Twenty-eight underwent reconstruction with a bone-patellar tendon-bone autograft, and twenty-eight were treated with a two-strand semitendinosus-gracilis autograft. Patients were followed for an average of thirty-nine months (range, thirty-six to fifty-seven months). At the time of final follow-up, twenty-two patients in each group were evaluated in terms of clinical test findings, patient satisfaction, activity level, functional status, and isokinetic muscle strength.Results: The objective outcome of replacement of the torn anterior cruciate ligament with a bone-patellar tendon-bone graft was superior to that obtained with a two-strand semitendinosus-gracilis graft. At the three-year follow-up interval, the patients in whom a hamstring graft had been used had an average of 4.4 mm of increased anterior knee laxity compared with the laxity of the contralateral, normal knee, whereas the patients in whom a bone-patellar tendon-bone graft had been used had an average of 1.1 mm of increased knee laxity. Fourteen percent (three) of the twenty-two patients with a hamstring graft had a mild pivot shift, and 27% (six) had a moderate pivot shift. Only 14% (three) of the twenty-two patients with a bone-patellar tendon-bone graft had a mild pivot shift, and none had a moderate pivot shift. At the same follow-up interval, the patients in whom a hamstring graft had been used had significantly lower peak knee-flexion strength than those who had a bone-patellar tendon-bone graft (p = 0.039). In contrast, the two treatments produced similar outcomes in terms of patient satisfaction, activity level, and knee function (ability to perform a one-legged hop, bear weight, squat, climb stairs, run in place, and duckwalk).Conclusions: After three years of follow-up, the objective results of anterior cruciate ligament replacement with a bone-patellar tendon-bone autograft were superior to those of replacement with a two-strand semitendinosus-gracilis graft with regard to knee laxity, pivot-shift grade, and strength of the knee flexor muscles. However, the two groups had comparable results in terms of patient satisfaction, activity level, and knee function.","PeriodicalId":22625,"journal":{"name":"The Journal of Bone & Joint Surgery","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75485071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of Early and Delayed Fixation of Subcapital Hip Fractures in Patients Sixty Years of Age or Less","authors":"R. Jain, Manfred Koo, H. Kreder, Emil H. Schemitsch, J. Davey, N. N. Mahomed","doi":"10.2106/00004623-200209000-00013","DOIUrl":"https://doi.org/10.2106/00004623-200209000-00013","url":null,"abstract":"Background: Subcapital hip fractures in younger patients are generally treated with internal fixation rather than with primary hemiarthroplasty, which is generally reserved for older, low-demand patients. Avascular necrosis can occur following this injury because of disruption of the femoral head blood supply. Some believe that emergent fracture reduction is necessary to minimize the risk of avascular necrosis. The purposes of this study were (1) to investigate the functional outcomes of subcapital hip fractures in patients sixty years old or younger and (2) to compare the rates of avascular necrosis after early and delayed fracture fixation.Methods: This retrospective study included adults in whom a subcapital hip fracture had been treated with reduction and internal fixation when they were sixty years of age or less and who had been followed clinically for a minimum of two years. The patients were divided into two groups: those treated with early fixation (within twelve hours after the injury) and those treated with delayed fixation (more than twelve hours after the injury). Functional outcomes were assessed with use of the Short Form-36 and the Western Ontario and McMaster University (WOMAC) Osteoarthritis Index. The rates of avascular necrosis were compared between the two groups.Results: Thirty-eight patients (average age, 46.4 years) participated in the study. Twenty-nine patients had a displaced subcapital hip fracture. Fifteen patients underwent early fracture fixation, and the remainder underwent delayed fixation. No differences in the Short Form-36 (p = 0.68) or WOMAC (p = 0.69) scores were seen between the early and delayed fixation groups. Radiographic evidence of avascular necrosis developed in six patients treated with delayed fixation, one of whom had had an undisplaced fracture preoperatively, and in no patient treated with early fixation. The difference in the rates of avascular necrosis was significant (p = 0.03).Conclusions: Although delayed surgical treatment of subcapital hip fractures was associated with a higher rate of avascular necrosis, this complication did not significantly affect functional outcome. Longer follow-up is required to assess the effect of avascular necrosis on the development of arthritis and on long-term patient function. Although the results could be biased because patients were not randomly assigned to delayed or early fixation, the data suggest that urgent reduction and fracture fixation within twelve hours after a displaced subcapital hip fracture in high-demand patients may be associated with a reduced rate of radiographic signs of avascular necrosis.","PeriodicalId":22625,"journal":{"name":"The Journal of Bone & Joint Surgery","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73176191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-Energy Fractures of the Tibial Plateau: Knee Function After Longer Follow-up","authors":"Dennis P. Weigel, J. Marsh","doi":"10.2106/00004623-200209000-00006","DOIUrl":"https://doi.org/10.2106/00004623-200209000-00006","url":null,"abstract":"Background: Studies of the long-term outcomes of treatment of fractures of the tibial plateau have included wide mixtures of fracture types and mostly low-energy split and split-depression fractures. The long-term results of treatment of high-energy intra-articular proximal tibial fractures are unknown. The purpose of this study was to assess the function of the knee and the development of arthrosis at a minimum of five years after injury in a consecutive series of patients in whom a high-energy fracture of the tibial plateau had been treated with a uniform technique of external fixation.Methods: Between July 1988 and December 1994, thirty patients with a total of thirty-one fractures of the tibial plateau were treated with a monolateral external fixator and limited internal fixation of the articular surface. Follow-up data on twenty-four knees in twenty-three patients were obtained at a mean of ninety-eight months. Twenty patients (twenty knees) returned specifically for the study, at which time they completed an Iowa Knee Score questionnaire and a Short Form-36 (SF-36) general health survey, a physical examination was performed, and weight-bearing radiographs were made. The results of the SF-36 evaluations for fourteen patients and the Knee Scores for twelve were compared with those obtained five years previously, at two to four years after the injury.Results: After healing, no patient required a secondary reconstructive procedure. The range of motion of the knee averaged 3° of extension to 120° flexion, which was an average of 87% of the total arc of the contralateral knee. The average Iowa Knee Score was 90 points (range, 72 to 100 points). For twelve patients, the Iowa Knee Score previously recorded at two to four years averaged 92 points, as did the score at the time of the latest follow-up. Thirteen patients rated their outcome as excellent; six, as good; and three, as fair. Fifteen patients were working, and ten of them were performing strenuous labor. Radiographs showed no evidence of arthrosis in fourteen knees, grade-1 arthrosis in three, grade-2 in three, and grade-3 in two. Compared with the radiographic appearance two to four years after injury, there was no evidence of progression of arthrosis in eighteen knees and one grade of progression in four. The SF-36 subscale scores were similar to those of age-matched controls. The fourteen patients who had previous SF-36 scores had no deterioration of these scores.Conclusions: Patients with a high-energy fracture of the tibial plateau treated with external fixation have a good prognosis for satisfactory knee function in the second five years after injury. The knee joint cartilage appears to be tolerant of both the injury and mild-to-moderate residual articular displacement, which was associated with a low rate of severe arthrosis.","PeriodicalId":22625,"journal":{"name":"The Journal of Bone & Joint Surgery","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80610788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cementation of a Polyethylene Liner into a Metal Shell: Factors Related to Mechanical Stability","authors":"K. Bonner, R. Delanois, G. Harbach, M. Bushelow, Michael A. Mont","doi":"10.2106/00004623-200209000-00011","DOIUrl":"https://doi.org/10.2106/00004623-200209000-00011","url":null,"abstract":"Background: Various clinical situations may make polyethylene liner exchange desirable in the setting of a well-fixed metal shell. Options have included a simple polyethylene liner exchange or revision of the entire acetabular shell. A recently introduced technique involves cementation of a new liner into a well-fixed metal shell. The purposes of this study were to quantify the mechanical integrity of this method of liner fixation, to evaluate the factors that may influence immediate liner fixation, and to compare this construct with a standard locking mechanism.Methods: One modular acetabular cup design was evaluated. Variables that may contribute to the mechanical integrity of the construct were evaluated via lever-out and multiaxis dislocation testing methods. The variables included the size of the liner (undersized versus oversized), type of liner (all-polyethylene versus modular design), modification of the modular liner (unmodified versus grooved), and groove configuration (cruciform versus circumferential). Metal shells with and without screw-holes were also tested. The modular locking mechanism was used as the control.Results: None of the constructs failed at the cement-metal interface. All undersized liners required significantly higher loads to failure than either the controls (p < 0.001) or the oversized liners (p < 0.001). Oversized unmodified liners failed at significantly lower loads than the controls did (p < 0.01). The creation of circumferential grooves in the oversized liners significantly improved the strength of the constructs (p < 0.01), making them comparable with the controls. No significant differences were found among the four undersized groups (p > 0.3). The standard locking construct (control) and the oversized unmodified construct failed at a force of 2000 N in the multiaxis dislocation test. No other construct failed with use of this test mode.Conclusions: Cementation of a polyethylene liner into a metal shell can be stronger than a conventional locking mechanism if the liner is undersized. Cementation of an oversized liner into a shell should be performed with caution. The long-term durability of this fixation remains unknown.Clinical Relevance: Cementation of a polyethylene liner in a well-fixed metal shell may provide an alternative option in acetabular revision surgery.","PeriodicalId":22625,"journal":{"name":"The Journal of Bone & Joint Surgery","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90746299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-Term Results of Use of a Collared Matte-Finished Femoral Component Fixed with Second-Generation Cementing Techniques: A Fifteen-Year-Median Follow-up Study","authors":"J. Sánchez-Sotelo, D. Berry, S. Harmsen","doi":"10.2106/00004623-200209000-00018","DOIUrl":"https://doi.org/10.2106/00004623-200209000-00018","url":null,"abstract":"Background: So-called second-generation cementing techniques in total hip arthroplasty have been shown to provide better survival of the femoral component than first-generation methods do; however, surface finish and other features of the component design also influence the durability of the reconstruction. The purpose of this study was to determine the results of primary total hip replacement with use of a collared femoral component with a matte-finished surface fixed with second-generation cementing techniques and followed for ten to twenty years.Methods: The study group consisted of 256 consecutive hips in 236 patients who had had a primary total hip arthroplasty with fixation of a Harris Design-2 femoral component with second-generation cementing techniques (use of an intramedullary plug and a cement gun). The mean age of the patients at the time of the operation was sixty-six years. One hundred and twelve patients were male, and 124 were female. Seven patients were lost to follow-up less than ten years after the operation. The median duration of follow-up of the living patients who had not had a revision was 15.4 years.Results: At the time of the most recent follow-up, nineteen femoral components (7%) had been revised because of aseptic loosening, five (2%) had been removed because of deep infection, and one (0.4%) had been revised because of recurrent dislocation. The mean Harris hip score for the surviving patients who had not had a revision improved from 51 points preoperatively to 91 points at the most recent evaluation. At fifteen years, the estimated survival rate of the femoral components was 92.2% with revision due to aseptic loosening as the end point and 90.1% with mechanical failure (radiographic loosening or revision due to aseptic loosening) as the end point. Patients who were younger than fifty years old at the time of the operation had a lower fifteen-year rate of survival of the femoral implant, in terms of both revision due to aseptic loosening (72.3% compared with 95.7%, p = 0.0001) and mechanical failure (72.3% compared with 93.1%, p = 0.005), than did patients who were fifty years or older.Conclusions: Fixation of this collared matte-finished femoral component with use of second-generation cementing techniques for primary total hip replacement provided satisfactory results at ten to twenty years in older patients but less satisfactory results in younger patients.","PeriodicalId":22625,"journal":{"name":"The Journal of Bone & Joint Surgery","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87299265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}