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1.
Orthopedics ; 38(6): e529-35, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-26091228

RESUMO

The prevalence of infections caused by methicillin-resistant organisms has increased, causing difficulty in the treatment of prosthetic joint infection. A multicenter study was performed to review 50 patients with deep infections with or without a resistant organism, such as methicillin-resistant Staphylococcus aureus, at the site of total knee arthroplasty. A group of 13 patients with early deep infections and 4 patients with acute hematogenous infections underwent treatment with debridement, antibiotic therapy, and retention of the prosthesis with revision of the polyethylene insert. Thirty-three patients with late chronic infections were treated with challenging prosthesis retention for prostheses that had not loosened or 2-stage exchange arthroplasty for prostheses that had loosened. Mean duration of follow-up was 4.7±1.8 years. No significant differences in resultant functional knees and mean number of operations were observed between 7 patients with resistant early deep infections and 6 patients with nonresistant early deep infections. However, 24 patients with nonresistant chronic infections showed significant improvement in resultant functional knees (24 of 24; 100%) and fewer mean operations (2.8 times) compared with 9 patients with resistant chronic infections (1 of 9, 11%, and 4.3 times, respectively). The remaining 8 patients with resistant chronic infections (89%) had arthrodesis (3 patients) or underwent above-the-knee amputation (1 patient) or spacer arthroplasty (4 patients). Although patients with resistant early postoperative deep infections showed good results that were similar to those in patients with nonresistant early infections, those with resistant late chronic infections had a significantly inferior success rate compared with those who had nonresistant late chronic infections.


Assuntos
Antibacterianos/uso terapêutico , Artroplastia do Joelho/efeitos adversos , Prótese do Joelho/efeitos adversos , Infecções Relacionadas à Prótese/terapia , Infecções Estafilocócicas/terapia , Idoso , Desbridamento , Feminino , Humanos , Masculino , Staphylococcus aureus Resistente à Meticilina , Pessoa de Meia-Idade , Infecções Relacionadas à Prótese/tratamento farmacológico , Infecções Relacionadas à Prótese/cirurgia , Reoperação , Estudos Retrospectivos , Infecções Estafilocócicas/tratamento farmacológico , Infecções Estafilocócicas/cirurgia , Resultado do Tratamento
2.
Knee ; 22(4): 328-32, 2015 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-25937092

RESUMO

BACKGROUND: Whereas clinical studies have revealed a number of important risk factors for postoperative infection following total knee arthroplasty (TKA), it is unclear which factor influences clinical results. A multicenter study was therefore performed by reviewing 51 patients with deep infection after TKA and seeking for the factors related to clinical outcomes. METHODS: Fifty-one deep infections after TKA were treated from 2000 to 2011 at the multicenter including a university or three arthroplasty centers. Among them, two clinical outcome measures including retention of prosthesis at initial treatment and functional prosthetic knee were assessed for several factors such as age, sex, primary diagnosis, onset time after primary TKA, type of hospital where the primary TKA was performed and the organism's resistance to methicillin using the logistic regression analysis model. RESULTS: Among the factors, type of hospital where the primary TKA was performed and onset time after primary TKA had higher multivariable-adjusted odds ratios (ORs) for retention of primary prosthesis (ORs 35.21 and 11.69, respectively.). The cases which primary surgery were performed in arthroplasty centers had higher multivariable-adjusted ORs for functional prosthetic knee (OR 4.9). Thirty-one infection cases with non-methicillin-resistant organisms were all able to keep functional prosthetic knee after the operation, whereas 13 out of 20 infection cases with methicillin-resistant organisms lost their knee function after the operation. CONCLUSIONS: Onset time after primary TKA, type of hospital where the primary surgery was performed and the organism's resistance to methicillin are important factors influencing the clinical outcomes after infected TKA. LEVEL OF EVIDENCE: Level 3. Retrospective comparative study.


Assuntos
Artroplastia do Joelho/efeitos adversos , Prótese do Joelho/efeitos adversos , Osteoartrite do Joelho/cirurgia , Infecções Relacionadas à Prótese/etiologia , Medição de Risco , Idoso , Feminino , Seguimentos , Humanos , Incidência , Japão/epidemiologia , Masculino , Infecções Relacionadas à Prótese/epidemiologia , Estudos Retrospectivos , Fatores de Risco
3.
Knee Surg Sports Traumatol Arthrosc ; 23(11): 3362-7, 2015 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-25079132

RESUMO

PURPOSE: The sagittal fibular axis serves as an intra-operative landmark during conventional total knee arthroplasty (TKA); however, only a few relevant anatomical studies have been published regarding its use as an extramedullary guide. Furthermore, the correlation between the coronal fibular and tibial mechanical axes in osteoarthritic knees has been only reported once. Here, the hypothesis of this study is that the fibula can be a reliable intra-operative landmark, in the sagittal and coronal planes, among patients with osteoarthritis who have undergone TKA. METHODS: Osteoarthritic knees (n = 62) after TKA were evaluated using three-dimensional image-matching software. The angles between the tibial mechanical axis and the fibular shaft axis were measured in the sagittal and coronal planes. Moreover, correlations between the angles and patient-specific factors were evaluated. RESULTS: The mean angle between the tibial mechanical and fibular shaft axes was 2.6° ± 2.3° for posterior inclination in the sagittal plane and 0.9° ± 2.0° for varus inclination in the coronal plane. The percentage of subjects with the fibular shaft axis within 2° of the tibial mechanical axis was 17.7 and 69.3 % in the sagittal and coronal planes, respectively. No patient-specific factors were correlated with the angle between the tibial mechanical and fibular shaft axes. CONCLUSIONS: The angle between the tibial mechanical and fibular shaft axes differed among patients, independent of patient-specific factors, and did not appear to be a reliable intra-operative landmark. Surgeons should use values from individual pre-operative evaluations of the axis as reference for conventional TKA. LEVEL OF EVIDENCE: Case series with no comparison group, Level IV.


Assuntos
Pontos de Referência Anatômicos , Artroplastia do Joelho/métodos , Fíbula/patologia , Articulação do Joelho/cirurgia , Osteoartrite do Joelho/cirurgia , Tíbia/patologia , Idoso , Feminino , Fíbula/diagnóstico por imagem , Fíbula/cirurgia , Humanos , Imageamento Tridimensional , Articulação do Joelho/diagnóstico por imagem , Masculino , Radiografia , Software , Tíbia/diagnóstico por imagem , Tíbia/cirurgia
4.
Orthopedics ; 37(4): e367-73, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24762842

RESUMO

This study investigated the efficacy of tibial tubercle osteotomy (TTO) with screw fixation as part of the surgical treatment of primary complicated total knee arthroplasty (TKA) and revision TKA. From January 2000 to April 2011, 15 patients (15 knees) underwent revision TKA and 20 patients (21 knees) underwent primary TKA. The average patient age was 68.7±8.7 years. Patients underwent follow-up at the authors' institution for an average of 60.6±32.9 months. Comparison of preoperative and postoperative Knee Society Scores and Knee Society Functional Scores showed significant postoperative improvement (P<.05). Moreover, postoperative range of motion of the knee improved from 88.5°±33.8° to 104.3°±18.2° (P<.05). Radiographic assessment showed that the average period to bone union was 10.8±5 weeks (range, 5-28 weeks), the average length of the bone fragment was 59.4±5.9 mm, the average width at the proximal end was 18.9±2.9 mm, and the average thickness at the proximal end of the osteotomy was 10.3±1.2 mm. Tibial tubercle osteotomy provided wide exposure for TKA while protecting the extensor mechanism. Solid bone-to-bone fixation was achieved using TTO with 2 screws, and although the overall complication rate was 8.3%, none of the complications were associated with TTO itself. It is recommended that the bone fragment be 60 mm long, 20 mm wide, and 10 mm thick at the proximal end. Appropriate size of the osteotomized bone and solid screw fixation are essential to prevent complications during this procedure.


Assuntos
Artroplastia do Joelho/métodos , Artropatias/cirurgia , Articulação do Joelho/cirurgia , Osteotomia , Tíbia/cirurgia , Idoso , Idoso de 80 Anos ou mais , Parafusos Ósseos , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Amplitude de Movimento Articular , Reoperação
5.
Knee Surg Sports Traumatol Arthrosc ; 22(7): 1599-606, 2014 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-23188499

RESUMO

PURPOSE: The objectives of the study were to examine knee kinematics in knees with severe valgus deformities and to compare pre- and post-operative knee kinematics for the same subjects implanted with medial-pivot total knee arthroplasty (TKA). METHODS: Seven subjects with severe valgus deformities due to osteoarthritis (OA) or rheumatoid arthritis (RA) were enrolled in the prospective study. Prior to TKA, three-dimensional (3D) kinematics were assessed by 3D to 2D registration technique using the image matching software 'Knee Motion', under in vivo, weight-bearing conditions. Postoperatively, each subject again performed the same motion under fluoroscopic surveillance. RESULTS: Preoperative kinematics demonstrated external rotation of tibias from extension to flexion, and small posterior femoral translations dominated in the medial condyle associated with anterior slides during partial range of motion. Postoperatively, these non-physiological tibial rotations were restored, and most subjects exhibited small internal rotations of tibias. On average, preoperative tibial internal rotation was -4.7° ± 7.6° from full extension to maximum flexion, and the angle was 4.8° ± 3.1° postoperatively (p = 0.01). In addition, small amounts of posterior translation of the lateral condyle and anterior translation of the medial condyle were confirmed in most subjects postoperatively. CONCLUSIONS: The study showed that the preoperative kinematic pattern established in severe valgus deformity was different from the physiological knee pattern. In addition, post-operative results suggest that the non-physiological kinematics were partially restored after TKA by using the prosthesis design even in the absence of the posterior cruciate ligament (PCL) and the cam-post mechanism.


Assuntos
Artrite Reumatoide , Artroplastia do Joelho/métodos , Articulação do Joelho , Prótese do Joelho , Osteoartrite do Joelho , Idoso , Artrite Reumatoide/diagnóstico por imagem , Artrite Reumatoide/fisiopatologia , Artrite Reumatoide/cirurgia , Fenômenos Biomecânicos , Feminino , Fluoroscopia , Humanos , Articulação do Joelho/diagnóstico por imagem , Articulação do Joelho/fisiopatologia , Articulação do Joelho/cirurgia , Osteoartrite do Joelho/diagnóstico por imagem , Osteoartrite do Joelho/fisiopatologia , Osteoartrite do Joelho/cirurgia , Estudos Prospectivos , Amplitude de Movimento Articular/fisiologia , Rotação , Suporte de Carga/fisiologia
6.
Knee Surg Sports Traumatol Arthrosc ; 22(3): 576-80, 2014 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-23223966

RESUMO

PURPOSE: To compare the clinical midterm results in ADVANCE total knee arthroplasty (TKA) with double-high (DH) insert, with same type implant with medial-pivot (MP) insert. METHOD: Forty ADVANCE TKAs were randomly divided into two groups, and two different design insert, DH insert, and MP insert were used in each group. At midterm, 4-5 years after surgery, Knee Society Scores (KSS), Knee Society Functional Scores (KSFS), range of motion (ROM), and UCLA activity score were assessed and reported in this study. RESULTS: Midterm clinical results, including ROM and KSS, were comparable with both groups. KSFS and UCLA activity score were equally good between the two groups. CONCLUSION: The results in this study revealed equally good clinical results with these types of implants at midterm follow-up, although the significant better ROM has not achieved by using DH insert. We concluded that the selection of inserts only could not achieve the better clinical results, including ROM and activity level in this study. LEVEL OF EVIDENCE: Therapeutic studies-investigating the results of treatment, Level II.


Assuntos
Artroplastia do Joelho/instrumentação , Prótese do Joelho , Osteoartrite do Joelho/cirurgia , Idoso , Idoso de 80 Anos ou mais , Artroplastia do Joelho/métodos , Feminino , Seguimentos , Humanos , Articulação do Joelho/fisiologia , Articulação do Joelho/cirurgia , Masculino , Pessoa de Meia-Idade , Desenho de Prótese , Amplitude de Movimento Articular , Resultado do Tratamento
7.
Int Orthop ; 38(3): 509-15, 2014 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-23925880

RESUMO

PURPOSE: ADVANCE Medial Pivot (MP) (Wright Medical) total knee arthroplasty (TKA) was established to replicate normal tibio-femoral knee joint kinematics, however, its influence on the patello-femoral (PF) joint is unclear. The purpose in this study was to assess the PF joint conditions in Advance MP TKA, via radiography and three-dimensional image-matching software. METHODS: Ten subjects with osteoarthritis were treated with the ADVANCE MP TKA. Pre-operatively and one month after surgery, skyline views at 30, 60, and 90° of flexion were taken, and patella shift and tilt were measured. With 2D-3D registration techniques using software, implant orientations were matched with the pre-operative CT and changes in the anterior part of the femoral prosthesis, condylar twist angle (CTA) for femoral rotation, and tibial rotation were evaluated. The relationships between morphological and rotational changes were evaluated. RESULTS: There were significant differences in patella tilt at 60° and patella shift at all angles between pre- and post-operation (p < 0.05). No correlation was found between morphological changes in the anterior femur with patella tilt and shift. A positive correlation between postoperative CTA and patella shift at 90° was found (p < 0.05); however, no correlation was found between rotational alignment of the tibial component and patella tilt and shift. CONCLUSIONS: ADVANCE MP TKA changed patello-femoral joint kinematics, compared to that found before surgery. The kinematic features were mainly due to the design concepts for tibio-femoral joint motion, indicating the difficulty to reproduce normal patello-femoral joint kinematics after TKA.


Assuntos
Artroplastia do Joelho/métodos , Articulação do Joelho/cirurgia , Prótese do Joelho , Osteoartrite do Joelho/cirurgia , Articulação Patelofemoral/diagnóstico por imagem , Articulação Patelofemoral/fisiologia , Amplitude de Movimento Articular/fisiologia , Idoso , Idoso de 80 Anos ou mais , Artroplastia do Joelho/instrumentação , Fenômenos Biomecânicos , Feminino , Fêmur/cirurgia , Humanos , Imageamento Tridimensional , Masculino , Patela/cirurgia , Articulação Patelofemoral/cirurgia , Desenho de Prótese , Tomografia Computadorizada por Raios X , Resultado do Tratamento
8.
Int Orthop ; 37(10): 1911-5, 2013 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-23807729

RESUMO

PURPOSE: This study aimed to clarify the results of computer-assisted total knee arthroplasty (TKA) after ten years using patient-derived scores. METHODS: Thirty posterior-stabilised total knee prostheses implanted using a computed tomography-free navigation system were compared with 30 matched total knee prostheses of the same type implanted using a conventional, manual technique. At an average of ten years after surgery, we investigated patient-reported outcomes using the Knee Society's new scoring system. The results of 27 patients (14 patients in the navigation group and 13 patients in the manual group) were assessed in this study. RESULTS: There was no significant difference between the navigation and manual groups for any section of the questionnaire, which consisted of symptoms, patient satisfaction, patient expectation, walking/standing, standard activities, advanced activities, and discretionary activities. CONCLUSION: After long-term follow-up, we found no subjective advantages of using a navigation system for patients who undergo TKA though the absolute number of patients was very small. Additional extensive studies are required to validate our result.


Assuntos
Artroplastia do Joelho/métodos , Osteoartrite do Joelho/cirurgia , Cirurgia Assistida por Computador/métodos , Atividades Cotidianas , Idoso , Feminino , Seguimentos , Humanos , Estudos Longitudinais , Masculino , Pessoa de Meia-Idade , Satisfação do Paciente , Inquéritos e Questionários , Fatores de Tempo , Resultado do Tratamento
9.
Spine (Phila Pa 1976) ; 38(2): 104-11, 2013 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-22781004

RESUMO

STUDY DESIGN: Retrospective study. OBJECTIVE: To examine the prevalence of lower urinary tract symptoms (LUTS) and neurogenic bladder (NB), and surgical outcomes in pure cervical spondylotic myelopathy. SUMMARY OF BACKGROUND DATA: The inclusion of various types of cervical diseases, NB, and no obvious definition of NB provided the wide range of NB prevalence frequency among previous reports. METHODS: Of the 220 operated patients with cervical myelopathy, 54 were selected by excluding other cervical and/or concomitant diseases contributing to LUTS. All patients with LUTS were referred to urologists and recommended to undergo urodynamic study (UDS). The presence of NB was judged by abnormal findings of UDS according to the most recent criteria and a congruity between LUTS and the course of cervical myelopathy. Patients were divided into 4 groups: no symptoms, positive symptoms without UDS examination, positive symptoms with positive NB, and positive symptoms with negative NB. Evaluation scores were compared among the groups before and after surgery. RESULTS: There were no particular LUTS in NB patients. Prevalence of LUTS was 53.7% and that of NB was at least 20.4% in the patients with pure cervical spondylotic myelopathy. The scores of all 4 groups improved after surgery (P < 0.05); however, the recovery rate of NB group (47.1%) was the worst among the groups (no-symptoms group, 69.3%; negative-NB group, 53.5%; and positive symptoms without UDS group, 57.1%). Preoperative part scores showed no difference among the groups, whereas NB group demonstrated lower scores in finger and lower extremity postoperatively. A post hoc analysis confirmed a significantly poorer recovery rate related to the NB group only in the lower extremities. CONCLUSION: This study is the first to describe the prevalence of LUTS and NB according to the most recent criteria in patients with pure cervical spondylotic myelopathy, which demonstrated that neurological functions in NB patients may recover; however, the extent will be limited to two-thirds of those in patients with no-NB; moreover, the remaining symptoms derive from poor lower limb function.


Assuntos
Vértebras Cervicais , Descompressão Cirúrgica/métodos , Laminectomia , Espondilose/epidemiologia , Bexiga Urinaria Neurogênica/epidemiologia , Comorbidade , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Prevalência , Recuperação de Função Fisiológica , Estudos Retrospectivos , Espondilose/fisiopatologia , Espondilose/cirurgia , Resultado do Tratamento , Bexiga Urinaria Neurogênica/fisiopatologia , Bexiga Urinaria Neurogênica/cirurgia
10.
Int Orthop ; 36(10): 2073-7, 2012 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-22885803

RESUMO

PURPOSE: ADVANCE Medial-Pivot (MP) (Wright Medical Technology, Arlington, TN, USA) total knee arthroplasty (TKA) was developed to replicate normal tibiofemoral knee joint kinematics, allowing medial-pivot knee motion. The design concept of the prosthesis is unique; therefore, the influence on the patellofemoral knee joint remains unclear at present. The purpose of this study was to determine the in vivo patellofemoral kinematics with ADVANCE MP TKA and compare them with the pre-operative conditions. METHODS: ADVANCE MP TKA was performed in ten subjects with osteoarthritis (OA). At before and one month after surgery, lateral radiographs with weight-bearing at maximum extension, 30, 60 and 90° were taken, and patella flexion angle (PF), tibiopatellar angle (TP) and estimated patellofemoral contact point (PC) were evaluated, according to a previously reported method. RESULTS: In PF and TP, there was no statistically significant change between pre-operative and postoperative values. Pre-operative PC reached its peak at 90°; however, its peak was at 60° at one month after surgery. Postoperative PC at maximum extension was significantly higher compared to before surgery. CONCLUSIONS: The results in this study indicated that ADVANCE MP TKA changed patellofemoral joint kinematics compared to before surgery. Early postoperative evaluation is the limitation of this study; however, we consider that the results in this study might be one of the keys to resolving the kinematic features of this prosthesis, helping clinicians to comprehend this prosthesis.


Assuntos
Artroplastia do Joelho/instrumentação , Prótese do Joelho , Articulação Patelofemoral/cirurgia , Desenho de Prótese , Artroplastia do Joelho/efeitos adversos , Artroplastia do Joelho/métodos , Fenômenos Biomecânicos , Humanos , Osteoartrite do Joelho/fisiopatologia , Osteoartrite do Joelho/cirurgia , Articulação Patelofemoral/fisiopatologia , Complicações Pós-Operatórias , Período Pré-Operatório , Amplitude de Movimento Articular , Resultado do Tratamento , Suporte de Carga
11.
Orthopedics ; 34(12): e860-5, 2011 Dec 06.
Artigo em Inglês | MEDLINE | ID: mdl-22146202

RESUMO

We adopted a new computed tomography (CT)-free navigation system and noticed that, compared with our previous experience using a different type of CT-free navigation system that led to oversized and extended femoral component implanted compared with the conventional implantation, the femoral components were similarly implanted to the conventional method. The purpose of our study was to compare alignment and sizing with these 2 image-free systems and determine whether the method to determine the knee center could explain these differences in femoral component size and flexion of the component. Thirty posterior-stabilized total knee prostheses were implanted using the OrthoPilot CT-free navigation system (B. Braun-Aesculap, Tuttlingen, Germany). Postoperative coronal and sagittal long leg radiographs were retrospectively compared with those of a control group of 30 matched-paired total knee prostheses previously implanted using the VectorVision CT-free navigation system (Depuy-BrainLAB, Heimstetten, Germany). Sagittal alignment of the femoral component in the VectorVision group showed a significantly extended position compared with that in the OrthoPilot group. In addition, the size of the selected femoral component in the Vector Vision group was significantly larger than that in the OrthoPilot group. This discrepancy may be explained by the differences in the determined knee center, which influenced the postoperative implantation. When surgeons select a navigation system, the characteristics of each system should be taken into consideration.


Assuntos
Artroplastia do Joelho/métodos , Mau Alinhamento Ósseo/prevenção & controle , Fêmur/cirurgia , Prótese do Joelho , Desenho de Prótese , Idoso , Idoso de 80 Anos ou mais , Artroplastia do Joelho/efeitos adversos , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias , Cirurgia Assistida por Computador
12.
Int Orthop ; 35(11): 1639-45, 2011 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-21253725

RESUMO

PURPOSE: This is a randomised controlled trial to examine whether intra-articular injection of tranexamic acid (TXA) decreases blood loss, as well as reducing leg swelling after total knee arthroplasty (TKA). METHODS: We performed 100 TKA in osteoarthritis patients. At closure, a total of 2,000 mg/20 ml TXA was injected into the knee joint through a closed suction drain (TXA group). For the control group, the same volume of physiological saline was injected. The pre-operative condition of the patients, post-operative haemoglobin (Hb) levels, discharge volumes from drain, D-dimer and needs for transfusion were compared between these two groups. Furthermore, leg diameters (thigh, suprapatellar portion and calf girth) were measured pre- and post-operatively to investigate whether TXA has an influence on leg swelling after surgery. RESULTS: The results revealed that post-operative decrease in Hb level was significantly reduced in the TXA group. Furthermore, knee joint swelling after operation was significantly suppressed in the TXA group compared to the control group. CONCLUSIONS: The results revealed intra-articular administration of TXA decreased not only blood loss, but also knee joint swelling after TKA.


Assuntos
Antifibrinolíticos/uso terapêutico , Artroplastia do Joelho/métodos , Perda Sanguínea Cirúrgica/prevenção & controle , Edema/prevenção & controle , Articulação do Joelho/efeitos dos fármacos , Ácido Tranexâmico/uso terapêutico , Idoso , Artroplastia do Joelho/efeitos adversos , Feminino , Fibrinólise/efeitos dos fármacos , Humanos , Injeções Intra-Articulares , Articulação do Joelho/patologia , Articulação do Joelho/cirurgia , Masculino , Osteoartrite do Joelho/cirurgia , Estudos Prospectivos , Resultado do Tratamento
13.
Knee Surg Sports Traumatol Arthrosc ; 19(7): 1107-12, 2011 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-21234541

RESUMO

PURPOSE: The aim of this study is to investigate the clinical results of total knee arthroplasty (TKA) using a navigation system after a minimum of 5 years. METHOD: Thirty cases of posterior-stabilized, TKA-implanted using a computed tomography-free navigation system were compared with 30 cases having matched TKA of the same type implanted via a classical, manual technique. At mid term, a minimum of 5 years after surgery, Knee Society scores (KSSs), Knee Society Functional scores (KSFSs), range of motion (ROM), and radiographic results of 27 patients in each group were assessed and reported in this study. RESULTS: The accuracy of the implantations in relation to the coronal mechanical axis in the navigation group was superior to that of the manual group (P < 0.01). The femoral rotational profile revealed the prosthesis in the navigation group that was implanted with significantly less internal rotation than the manual group. Mid-term 5-year clinical results, including ROMs and KSSs, were significantly better in the navigation group (P < 0.01). KSFSs were equally good in both the groups. CONCLUSION: Better alignment and similarity of good clinical results at mid-term follow up may provide patients who receive navigation TKA with long-term endurance of their implants. Further studies on longer-term outcomes and functional improvements are required to validate these possibilities.


Assuntos
Artroplastia do Joelho/métodos , Cirurgia Assistida por Computador , Idoso , Idoso de 80 Anos ou mais , Estudos de Casos e Controles , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Resultado do Tratamento
14.
Knee Surg Sports Traumatol Arthrosc ; 19(1): 112-4, 2011 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-20532867

RESUMO

One-staged tibial corrective osteotomy and total knee arthroplasty is a challenging but effective treatment for arthritic knees with extra-articular deformity. Although osteocutaneous thermal necrosis is accepted as a complication of intramedullary reamed nailing following long bone fractures, only 15 cases have been reported in the English literature at present. This report illustrates a rare case of thermal necrosis in a patient undergoing tibial corrective osteotomy coincident with long-stemmed total knee arthroplasty. Excessive reaming with a machine reamer is hypothesized as the cause of this serious complication. In this report, we highlight this rare but serious complication after long-stemmed total knee arthroplasty.


Assuntos
Artroplastia do Joelho/efeitos adversos , Artroplastia do Joelho/métodos , Osteotomia/métodos , Tíbia/patologia , Tíbia/cirurgia , Idoso , Fixação Interna de Fraturas/efeitos adversos , Temperatura Alta , Humanos , Deformidades Articulares Adquiridas/etiologia , Deformidades Articulares Adquiridas/cirurgia , Prótese do Joelho/efeitos adversos , Masculino , Necrose , Osteoartrite do Joelho/cirurgia , Desenho de Prótese , Infecções Relacionadas à Prótese/patologia , Infecções Relacionadas à Prótese/cirurgia , Cintilografia , Tíbia/diagnóstico por imagem , Fraturas da Tíbia/cirurgia
15.
J Arthroplasty ; 24(3): 358-64, 2009 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-18757174

RESUMO

Using a tensor for total knee arthroplasty (TKA) that is designed to facilitate soft tissue balance measurements with a reduced patello-femoral joint, we intraoperatively measured the joint gap and ligament balance of 30 osteoarthritic knees at extension and 90 degrees flexion, with the patella both everted and reduced, while performing primary posterior-stabilized TKA. At the same time, we performed the same measurements with a navigation system and identified correlations between this system and the tensor. Specifically, the R(2) values obtained with the knee in extension and 90 degrees flexion were higher with the patella reduced than with the patella everted. We thereby suggest that the navigation system we describe is reliable for obtaining accurate measurements of soft tissue balancing with the patella reduced.


Assuntos
Artroplastia do Joelho/métodos , Interpretação de Imagem Assistida por Computador , Prótese do Joelho , Osteoartrite do Joelho/cirurgia , Técnicas Estereotáxicas , Idoso , Artroplastia do Joelho/instrumentação , Fenômenos Biomecânicos , Pesos e Medidas Corporais , Feminino , Humanos , Ajuste de Prótese , Cirurgia Assistida por Computador
16.
Knee Surg Sports Traumatol Arthrosc ; 15(8): 1013-8, 2007 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-17457575

RESUMO

Recently, we developed a new tensor for total knee arthroplasty (TKA) procedures enabling soft tissue balance assessment throughout the range of motion while reproducing post-operative joint alignment with the patello-femoral (PF) joint reduced and the tibiofemoral joint aligned. Using the tensor with a computer-assisted navigation system, we investigated the relationship between various intra-operative joint gap values and their post-operative flexion angles. An increased value during the extension to flexion gap and a decreased value during the flexion to deep flexion gap with PF joint reduced, not everted, showed an inverse correlation with post-operative knee flexion angle, not pre-operative flexion angle. In conclusion, understanding the characteristics of joint gap kinematics in posterior-stabilized TKA under physiological and reproducible joint conditions may enable the prediction of the post-operative flexion angle and help to determine the appropriate intra-operative joint gap.


Assuntos
Artroplastia do Joelho , Prótese Articular , Articulação do Joelho/fisiopatologia , Monitorização Intraoperatória , Osteoartrite do Joelho/cirurgia , Desenho de Prótese , Amplitude de Movimento Articular/fisiologia , Idoso , Artroplastia do Joelho/métodos , Estudos de Viabilidade , Feminino , Fêmur/cirurgia , Seguimentos , Humanos , Movimento , Osteotomia/métodos , Patela/cirurgia , Reprodutibilidade dos Testes , Rotação , Cirurgia Assistida por Computador , Tíbia/cirurgia , Resultado do Tratamento
17.
Orthopedics ; 29(12): 1115-20, 2006 12.
Artigo em Inglês | MEDLINE | ID: mdl-17190171

RESUMO

Thirty posterior stabilized total knee prostheses implanted using a computed tomography-free navigation system were compared to a control group of 30 matched total knee prostheses of the same type implanted via a classical, surgeon-controlled technique. The accuracy of the implantations in relation to the mechanical axis in the navigation group was superior to that of the manual group. Early two-year clinical results including range of motion and Knee Society Clinical Rating Score were equally good compared to the manual group. However, potential long-term outcome and functional improvement require further investigation.


Assuntos
Artroplastia do Joelho/métodos , Artropatias/diagnóstico por imagem , Artropatias/cirurgia , Monitorização Intraoperatória/métodos , Cirurgia Assistida por Computador , Tomografia Computadorizada por Raios X , Idoso , Idoso de 80 Anos ou mais , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos
18.
J Biomech Eng ; 128(6): 867-71, 2006 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-17154688

RESUMO

BACKGROUND: The management of soft tissue balance during surgery is essential for the success of total knee arthroplasty (TKA) but remains difficult, leaving it much to the surgeon's feel. Previous assessments for soft tissue balance have been performed under unphysiological joint conditions, with patellar eversion and without the prosthesis only at extension and 90 deg of flexion. We therefore developed a new tensor for TKA procedures, enabling soft tissue balance assessment throughout the range of motion while reproducing postoperative joint alignment with the patellofemoral (PF) joint reduced and the tibiofemoral joint aligned. Our purpose in the present study was to clarify joint gap kinematics using the tensor with the CT-free computer assisted navigation system. METHOD OF APPROACH: Joint gap kinematics, defined as joint gap change during knee motion, was evaluated during 30 consecutive, primary posterior-stabilized (PS) TKA with the navigation system in 30 osteoarthritic patients. Measurements were performed using a newly developed tensor, which enabled the measurement of the joint gap throughout the range of motion, including the joint conditions relevant after TKA with PF joint reduced and trial femoral component in place. Joint gap was assessed by the tensor at full extension, 5 deg, 10 deg, 15 deg, 30 deg, 45 deg, 60 deg, 90 deg, and 135 deg of flexion with the patella both everted and reduced. The navigation system was used to obtain the accuracy of implantations and to measure an accurate flexion angle of the knee during the intraoperative joint gap measurement. RESULTS: Results showed that the joint gap varied depending on the knee flexion angle. Joint gap showed an accelerated decrease during full knee extension. With the PF joint everted, the joint gap increased throughout knee flexion. In contrast, the joint gap with the PF joint reduced increased with knee flexion but decreased after 60 deg of flexion. CONCLUSIONS: We clarified the characteristics of joint gap kinematics in PS TKA under physiological and reproducible joint conditions. Our findings can provide useful information for prosthetic design and selection and allow evaluation of surgical technique throughout the range of knee motion that may lead to consistent clinical outcomes after TKA.


Assuntos
Artroplastia do Joelho/instrumentação , Artroplastia do Joelho/métodos , Instabilidade Articular/fisiopatologia , Monitorização Intraoperatória/instrumentação , Osteoartrite do Joelho/fisiopatologia , Osteoartrite do Joelho/cirurgia , Exame Físico/instrumentação , Idoso , Desenho de Equipamento , Análise de Falha de Equipamento , Feminino , Humanos , Instabilidade Articular/diagnóstico , Instabilidade Articular/etiologia , Instabilidade Articular/prevenção & controle , Masculino , Monitorização Intraoperatória/métodos , Osteoartrite do Joelho/diagnóstico , Exame Físico/métodos , Amplitude de Movimento Articular , Reprodutibilidade dos Testes , Sensibilidade e Especificidade
19.
Spine J ; 6(3): 228-32, 2006.
Artigo em Inglês | MEDLINE | ID: mdl-16651215

RESUMO

BACKGROUND CONTEXT: In cranio-vertebral junction, retro-odontoid pseudotumor without evidence of rheumatoid arthritis is a rare condition. PURPOSE: To discuss the mechanism of enlarging retro-odontoid pseudotumor after expanding cervical laminoplasty as a predictable complication. STUDY DESIGN: We report a rare case of an elderly man with non-inflammatory retro-odontoid pseudotumor after cervical expanding laminoplasty. PATIENT SAMPLE: A 76-year-old man presented with progressive quadriparesis of two week's duration caused by enlarging retro-odontoid soft tissue mass after cervical laminoplasty. OUTCOME MEASURES: Pre- and postoperative image, including X-ray and MRI, and the Japanese Orthopaedic Association scores for cervical myelopathy were assessed. METHODS: The patient subsequently underwent resection of the posterior arch of the atlas and posterior fusion from the occiput to C6 using Olerud system without removal of the retro-odontoid soft tissue mass. RESULTS: One year after surgery, the Japanese Orthopaedic Association scores for cervical myelopathy improved from 1 to 10 points, and postoperative MRI showed a mild reduction in the size of the retro-odontoid soft tissue mass. CONCLUSIONS: The kyphotic stability from C3 to C7 after laminoplasty, leading to a compensatory hyperlordosis at the occipitocervical junction, may cause the development of a degenerative osteoarthritic change, resulting in the production of an enlarging mass. Not only posterior compression of spinal cord due to posterior arch of the hyperextended atlas but also anterior compression of spinal cord due to retro-odontoid pseudotumor probably triggered the severe myelopathy. Laminoplasty may be inappropriate in cervical myelopathy with kyphosis.


Assuntos
Vértebras Cervicais/patologia , Cifose/etiologia , Laminectomia/efeitos adversos , Processo Odontoide/patologia , Complicações Pós-Operatórias/patologia , Doenças da Coluna Vertebral/etiologia , Idoso , Vértebras Cervicais/cirurgia , Humanos , Cifose/cirurgia , Imageamento por Ressonância Magnética , Masculino , Complicações Pós-Operatórias/cirurgia , Doenças da Medula Espinal/etiologia , Doenças da Medula Espinal/cirurgia
20.
Knee Surg Sports Traumatol Arthrosc ; 14(5): 487-90, 2006 May.
Artigo em Inglês | MEDLINE | ID: mdl-16261350

RESUMO

We treated a 64-year-old female with bilateral painful snapping elbows due to synovial folds. Resection of the bilateral synovial folds resulted in relief from pain and snapping, and resulted in patient satisfaction. Daily dumbbell exercises of the bilateral elbows starting at an elderly age may have led to the bilateral snapping. Painful snapping elbow is a relatively rare condition, which usually occurs in a unilateral elbow of a younger patient. To our knowledge, bilateral painful snapping elbows triggered by daily dumbbell exercises in older patients have not been previously reported.


Assuntos
Artralgia/etiologia , Articulação do Cotovelo , Levantamento de Peso , Artralgia/cirurgia , Traumatismos em Atletas/complicações , Feminino , Humanos , Pessoa de Meia-Idade , Sinovectomia , Membrana Sinovial/patologia
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