| 1. |
- Campbell, David, et al.
(author)
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All-polyethylene tibial components in young patients have stable fixation; a comparison RSA study
- 2019
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In: Knee (Oxford). - : Elsevier. - 0968-0160 .- 1873-5800. ; 26:2, s. 392-399
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Journal article (peer-reviewed)abstract
- BACKGROUND: All-polyethylene (AP) tibial components in patients aged greater than 60 years have stable tibial migration patterns and favorable survival rates when compared to identical Metal-backed (MB) designs. Tibial component migration in younger patients has not been reported. The aim of this study was to examine the migration characteristics of patients aged less than 60 years compared to a previous cohort of AP and MB tibial components of identical design in older patients.METHODS: A prospective consecutive study examined tibial component migration in 21 patients aged less than 60 years undergoing a cemented total knee arthroplasty with an AP tibial component by radiostereometric analysis (RSA) to 24 months. Results were compared to the authors' previous series of 21 patients aged greater than 60 years that were randomized to either an AP or MB tibial component.RESULTS: Both age groups of patients implanted with an AP component had stable migration patterns with no patient having greater than 0.2° rotation or 0.2 mm maximum total point motion. Five of 11 MB tibial components displayed continued migration between one and two years. Subsidence was similar in all groups, whilst maximum total point motion was greater for the MB cohort (0.34 mm, 0.33 mm, 0.61 mm; AP <60, AP >60, MB).CONCLUSIONS: Young patients implanted with an AP tibial component had stable tibial migration patterns comparable to older patients with the same AP implant. Regardless of age, AP tibial components were at least as stable as MB tibial components.LEVEL OF EVIDENCE: Level II, Prospective comparative study.
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| 2. |
- Dowsey, Michelle M., et al.
(author)
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The association between radiographic severity and pre-operative function in patients undergoing primary knee replacement for osteoarthritis
- 2012
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In: Knee. - : Elsevier BV. - 1873-5800. ; 19:6, s. 860-865
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Journal article (peer-reviewed)abstract
- Objective: To determine the association between radiographic osteoarthritis (OA) and pre-operative function in patients undergoing primary knee replacement. Methods: Single centre study examining pre-operative outcomes in a consecutive series of 525 patients who underwent primary knee replacement for OA between January 2006 and December 2007. Pre-operative data included: demographics, American Society of Anaesthesiologists (ASA) status and OA in the contralateral knee. The International Knee Society (IKS) rating and Short Form-12 (SF-12) were recorded for each patient. Pre-operative radiographs were read by a single observer for Kellgren and Lawrence (K&L) grading and Osteoarthritis Research Society International (OARSI) atlas features. Multiple linear regression was used to assess the strength of associations between radiographic OA severity and function, adjusting for clinically relevant variables. Results: Lateral tibiofemoral osteophyte grade was an independent predictor of pre-operative function as determined by the functional sub-scale of the IKS in patients undergoing primary knee replacement (coefficient = 2.58, p = 0.033). No associations were evident between pre-operative function and modified K&L, joint space narrowing, Ahlback attrition and coronal plane deformity. Other statistically significant predictors of poorer pre-operative function included: advancing age, female gender, knee pain and poorer SF-12 mental component summary scores which including osteophyte grade accounted for 24.6% of the variation in functional scores, (r = 0.496). Conclusion: Osteophytes in the lateral compartment of the knee were associated with pre-operative function in patients with advanced knee OA. Further studies are required which examine individual radiographic features specifically in patients with advanced knee OA to determine their relationship to pre-operative pain and function. (C) 2012 Elsevier B.V. All rights reserved.
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| 3. |
- Hansson, Ulrik, et al.
(author)
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A randomised RSA study of Peri-Apatitetrade mark HA coating of a total knee prosthesis.
- 2008
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In: Knee. - : Elsevier BV. - 1873-5800. ; 15, s. 211-216
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Journal article (peer-reviewed)abstract
- BACKGROUND: In total knee replacement, sound early fixation of the prosthesis is crucial for achieving a good long-term result and for minimising the risk of loosening. Various types of prosthetic material, different surface textures and shapes and the incorporation of screws or pegs have been used to achieve good fixation, particularly in the uncemented knee. Hydroxyapatite (HA) coating of prosthetic joint components is another technique used to enhance early stability and so to improve the longevity of the prosthesis-bone fixation. HA ceramic coatings are mostly plasma sprayed onto the fixation surface of the implant. Plasma spraying is largely a 'line of sight' technique and as such there are difficulties involved when covering three-dimensional planes, such as porous beaded fixation surfaces typically found on several knee prostheses. The objective of this study was to assess the clinical performance of the solution-deposited HA coating, Peri-Apatitetrade mark , with regard to its ability to stimulate an endurable and stable implant fixation. PATIENTS AND METHODS: We randomised 60 patients into two groups; one group received the porous coated prosthesis with solution-deposited HA, and the other group received a prosthesis without HA. Radiostereometric examination was used as the primary tool for measuring migration in the prosthetic components. RESULTS: There was a lower incidence of early subsidence in the Peri-Apatitetrade mark group. At 24 months there were no differences in clinical scorings or maximal total point motion. CONCLUSION: Addition of solution-deposited HA coating appears to provide better early stable fixation in a porous coated knee prosthesis.
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| 4. |
- Hansson, Ulrik, et al.
(author)
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Mobile vs. fixed meniscal bearing in total knee replacement A randomised radiostereometric study.
- 2005
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In: Knee. - : Elsevier BV. - 1873-5800. ; 12:6, s. 414-418
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Journal article (peer-reviewed)abstract
- 52 knees scheduled for a total knee arthroplasty were randomised to either a fixed or a mobile polyethylene bearing. The design was identical in all parts. The knee systems used were the Rotaglide Total Knee System (RTK) (R) and the Nuffield Total Knee System (NTK) (R), both from the same manufacturer (Corin Medical Ltd., UK). All knees implanted were uncemented. The patients were followed for 2 years clinically and with radiostereometric analyses to assess migration over time and inducible displacement of the tibial component. Separate analysis of the mobility of the tibial insert in the knees with a mobile bearing was also made. The migration measured with RSA between the I st and 2nd year expressed as maximum total point motion (MTPM) might predict the risk of loosening of the implant.
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| 5. |
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| 6. |
- Hébert-Losier, Kim, et al.
(author)
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Curve analyses reveal altered knee, hip, and trunk kinematics during drop-jumps long after anterior cruciate ligament rupture
- 2018
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In: Knee (Oxford). - : Elsevier. - 0968-0160 .- 1873-5800. ; 25:2, s. 226-239
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Journal article (peer-reviewed)abstract
- Background: Anterior cruciate ligament (ACL) ruptures may lead to knee dysfunctions later in life. Single-leg tasks are often evaluated, but bilateral movements may also be compromised. Our aim was to use curve analyses to examine double-leg drop–jump kinematics in ACL-reconstructed, ACL-deficient, and healthy-knee cohorts.Methods: Subjects with unilateral ACL ruptures treated more than two decades ago (17–28 years) conservatively with physiotherapy (ACLPT, n = 26) or in combination with reconstructive surgery (ACLR, n = 28) and healthy-knee controls (n = 25) performed 40-cm drop–jumps. Three-dimensional knee, hip, and trunk kinematics were analyzed during Rebound, Flight, and Landing phases. Curves were time-normalized and compared between groups (injured and non-injured legs of ACLPT and ACLR vs. non-dominant and dominant legs of controls) and within groups (between legs) using functional analysis of variance methods.Results: Compared to controls, ACL groups exhibited less knee and hip flexion on both legs during Rebound and greater knee external rotation on their injured leg at the start of Rebound and Landing. ACLR also showed less trunk flexion during Rebound. Between-leg differences were observed in ACLR only, with the injured leg more internally rotated at the hip. Overall, kinematic curves were similar between ACLR and ACLPT. However, compared to controls, deviations spanned a greater proportion of the drop–jump movement at the hip in ACLR and at the knee in ACLPT.Conclusions: Trunk and bilateral leg kinematics during double-leg drop–jumps are still compromised long after ACL-rupture care, independent of treatment. Curve analyses indicate the presence of distinct compensatory mechanisms in ACLPT and ACLR compared to controls.
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| 7. |
- Kvist, Joanna, 1967-, et al.
(author)
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Gender differences in post-exercise sagittal knee translation : A comparison between elite volleyball players and swimmers
- 2006
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In: Knee (Oxford). - : Elsevier BV. - 0968-0160 .- 1873-5800. ; 13:2, s. 132-136
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Journal article (peer-reviewed)abstract
- Background: There is an increased risk for anterior cruciate ligament injury during the last part of a match or training session and one reason for that could be a post-exercise increase in tibial translation. Purpose: To investigate if sagittal tibial translation is affected after a workout session in volleyball or swimming in elite athletes. In addition, gender differences in sagittal tibial translation after the workout session were investigated. Method: Thirty-one elite volleyball players (16 male) and 33 elite swimmers (15 male) participated in this study. Measurements of total tibial translation were taken before and after a workout session in either volleyball or swimming with the use of a KT-1000 arthrometer. Results: Total tibial translation increased by 1.1 mm (SD 1.9) in the group consisting of both male and female volleyball players (p = 0.003) and remained unchanged in the swimmers. Male athletes increased their tibial translation with 1.8 mm (SD 1.8) and 0.6 mm (SD 1.1) in the two sports, respectively, while the tibial translation did not increase in the female athletes. Conclusion: Impact sports such as volleyball training leads to a post-exercise increase in tibial translation in male athletes. The increase in tibial translation in swimmers, that is a non-impact sport, was small and may not be clinically significant for the functional stability of the joint. It has been shown that female athletes have an increased risk for injury. Our results show no support for an increase in tibial translation being an important factor for this increased risk, and suggest that the difference between males and females in this regard should be sought elsewhere. © 2006 Elsevier B.V. All rights reserved.
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| 8. |
- Kvist, Joanna, 1967-
(author)
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Tibial translation in exercises used early in rehabilitation after anterior cruciate ligament reconstruction. Exercises to achieve weight-bearing
- 2006
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In: Knee (Oxford). - : Elsevier BV. - 0968-0160 .- 1873-5800. ; 13:6, s. 460-463
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Journal article (peer-reviewed)abstract
- Accelerated rehabilitation after ACL reconstruction involves early weight-bearing. Exercises designed to achieve weight-bearing should be effective for the neuromuscular system and protect the knee from excessive anterior tibial translation. The aim of this study was to assess the anterior tibial translation under two different body-weight shift exercises at 2 weeks post-ACL reconstruction and compare this with healthy controls. Methods: Seven patients at 2 weeks after ACL reconstruction and seven controls participated in the study. Dynamic sagittal tibial translation was registered during two body weight shift exercises (from side to side and forward-backward). Results: There was no significant difference in maximal translation between the two exercises in the ACL-reconstructed group. In the control group, the body weight shift from side-to-side exercise resulted in larger anterior translation compared to the forward-backward body weight shift. Conclusions: Two weeks after ACL reconstruction, both body weight shift exercises can be used to train body weight acceptance. © 2006 Elsevier B.V. All rights reserved.
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| 9. |
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| 10. |
- Marcano, Alejandro I., et al.
(author)
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Income change after cruciate ligament injury - A population-based study
- 2019
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In: Knee (Oxford). - : Elsevier BV. - 0968-0160 .- 1873-5800. ; 26:3, s. 603-611
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Journal article (peer-reviewed)abstract
- Objectives: To investigate the association between choice of treatment and patients' income after cruciate ligament (CL) injury and assess the effect of different covariates such as sex, age, comorbidities and type of work.Methods: This entire-population cohort study in Sweden included working patients with a diagnosed CL injury between 2002 and 2005, identified in The National Swedish Patient Register (n = 13,662). The exposure was the treatment choice (operative or non-operative treatment). The main outcome measure was average yearly income five years after CL diagnosis, adjusted for the following covariates: sex, age, comorbidities, type of work, region, calendar year, education and income.Results: Relative to non-operative treatment, operative treatment was associated with greater average yearly incomes (nine to 15%) after injury among patients between 20 and 50 years, patients with partial university education, patients living in large cities and patients with one comorbidity, despite no overall significant association in the national cohort. Delayed operative treatment (>1 year) had no significant association with income change, whereas early operative treatment (<1 year) was associated with higher average yearly incomes (11 to 16%) among females, patients between 20 and 50 years, patients living in large cities and patients with one comorbidity.Conclusions: In a broad sense, treatment choice was not associated with changes in income five years after CL injuries among patients in the workforce, however earlier operative treatment was associated with higher average incomes among patients with ages between 20 and 50, females, living in large cities, with one comorbidity and with a high level of education.
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