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Fang SYJ, Chiu KY, Liu WKT, Cheung A, Chan PK, Fu H. Factors Affecting Successful Restricted Kinematic Alignment With Robotic Assisted Total Knee Arthroplasty in Patients With Severe Varus Preoperative Alignment. Arthroplast Today 2024; 30:101490. [PMID: 39959381 PMCID: PMC11827013 DOI: 10.1016/j.artd.2024.101490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Revised: 06/23/2024] [Accepted: 07/23/2024] [Indexed: 02/18/2025] Open
Abstract
Background Total knee arthroplasty (TKA) remains challenging in severe varus knees. We evaluated the impact of hip-knee-ankle varus deformity and osteophyte size on achieving restricted kinematic alignment (rKA) in robotic-arm-assisted TKA. Methods This retrospective study included 244 knees (194 patients) that underwent robotic-arm-assisted TKA for varus primary knee osteoarthritis at an academic institution. Intraoperative hip-knee-ankle angle (HKA) and soft tissue balance were monitored to assess the success of rKA with osteophyte resection alone. For those that failed, medial collateral ligament needle pie-crusting was performed. Results Mean age was 65.3 years (range, 48-83). Mean preoperative HKA was 11.9° varus (range, 1.0°-32.0°), and HKA after osteophyte resection was 5.1° varus (range, 0°-19.0°). Mean HKA correction was 6.8° (range, 0°-18.0°). rKA was achieved in 36.9% at a boundary of ≤3° varus and up to 72.1% at ≤6° varus. Preoperative varus HKA was lower in successful cases across all target alignments (P < .05). Medial tibial osteophyte size was 6.1% ± 2.9% and was smaller in all groups that achieved rKA (P < .05). Both were positively correlated with degree of deformity correction, r = 0.718 (P < .01) and r = 0.281 (P < .01), respectively. Conclusions This study highlighted the importance of varus deformity and medial tibial osteophytes when adopting rKA. They were associated with increased failure to achieve rKA. rKA was reliably achieved in minimal varus deformities (HKA ≤ 5°), we recommend an expanded protocol of HKA ≤ 6° varus for mild deformities (HKA 6°-10°), and consider medial soft tissue release for moderate (HKA 11°-15°) and severe deformities (HKA ≥ 16°).
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Affiliation(s)
- Samuel Yan Jin Fang
- Department of Orthopaedics and Traumatology, Queen Mary Hospital, Hong Kong, SAR, China
| | - Kwong Yuen Chiu
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, SAR, China
| | - Wai Kiu Thomas Liu
- Department of Orthopaedics and Traumatology, Queen Mary Hospital, Hong Kong, SAR, China
| | - Amy Cheung
- Department of Orthopaedics and Traumatology, Queen Mary Hospital, Hong Kong, SAR, China
| | - Ping Keung Chan
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, SAR, China
| | - Henry Fu
- Department of Orthopaedics and Traumatology, The University of Hong Kong, Hong Kong, SAR, China
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Tzanetis P, de Souza K, Robertson S, Fluit R, Koopman B, Verdonschot N. Numerical study of osteophyte effects on preoperative knee functionality in patients undergoing total knee arthroplasty. J Orthop Res 2024; 42:1943-1954. [PMID: 38602446 DOI: 10.1002/jor.25850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 02/20/2024] [Accepted: 03/30/2024] [Indexed: 04/12/2024]
Abstract
Osteophytes are routinely removed during total knee arthroplasty, yet the preoperative planning currently relies on preoperative computed tomography (CT) scans of the patient's osteoarthritic knee, typically including osteophytic features. This complicates the surgeon's ability to anticipate the exact biomechanical effects of osteophytes and the consequences of their removal before the operation. The aim of this study was to investigate the effect of osteophytes on ligament strains and kinematics, and ascertain whether the osteophyte volume and location determine the extent of this effect. We segmented preoperative CT scans of 21 patients, featuring different osteophyte severity, using image-based active appearance models trained to identify the osteophytic and preosteophytic bone geometries and estimate the cartilage thickness in the segmented surfaces. The patients' morphologies were used to scale a template musculoskeletal knee model. Osteophytes induced clinically relevant changes to the knee's functional behavior, but these were variable and patient-specific. Generally, severe osteophytic knees significantly strained the oblique popliteal ligament (OPL) and posterior capsule (PC) relative to the preosteophytic state. Furthermore, there was a marked effect on the lateral collateral ligament and anterolateral ligament (ALL) strains compared to mild and moderate osteophytic knees, and concurrent alterations in the tibial lateral-medial translation and external-internal rotation. We found a strong correlation between the OPL, PC, and ALL strains and posterolateral condylar and tibial osteophytes, respectively. Our findings may have implications for the preoperative planning in total knee arthroplasty, toward reproducing the physiological knee biomechanics as close as feasibly possible.
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Affiliation(s)
- Periklis Tzanetis
- Department of Biomechanical Engineering, University of Twente, Enschede, The Netherlands
| | | | | | - René Fluit
- Faculty of Science and Engineering, University of Groningen, Groningen, The Netherlands
| | - Bart Koopman
- Department of Biomechanical Engineering, University of Twente, Enschede, The Netherlands
| | - Nico Verdonschot
- Department of Biomechanical Engineering, University of Twente, Enschede, The Netherlands
- Orthopaedic Research Laboratory, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
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Maeda T, Kuriyama S, Ito T, Umatani N, Nishitani K, Nakamura S, Matsuda S. Preoperative radiographs underdiagnose the severity of lateral femoral and medial trochlear cartilage damage in varus osteoarthritis knees. Mod Rheumatol 2024; 34:1062-1071. [PMID: 38123467 DOI: 10.1093/mr/road113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 07/19/2023] [Accepted: 12/15/2023] [Indexed: 12/23/2023]
Abstract
OBJECTIVE This study evaluated whether preoperative radiographs accurately predicted intra-articular cartilage damage in varus knees. METHODS The study assessed 181 knees in 156 patients who underwent total knee arthroplasty. Cartilage damage was graded by two examiners with the International Cartilage Repair Society classification; one used knee radiographs and the other used intraoperative photographs. It was then determined if this radiographic cartilage assessment over- or underestimated the actual damage severity. Knee morphological characteristics affecting radiographic misestimation of damage severity were also identified. RESULTS The concordance rate between radiographic and intraoperative assessments of the medial femoral condyle was high, at around 0.7. Large discrepancies were found for the lateral femoral condyle and medial trochlear groove. Radiographic assessment underestimated cartilage damage on the medial side of the lateral femoral condyle due to a large lateral tibiofemoral joint opening and severe varus alignment {both r = -0.43}. Medial trochlear damage was also underdiagnosed, in cases of residual medial tibiofemoral cartilage and shallow medial tibial slope {r = -0.25 and -0.21, respectively}. CONCLUSIONS Radiographic evaluation of knee osteoarthritis was moderately practical using International Cartilage Repair Society grades. Lateral femoral condyle and medial trochlear cartilage damage tended to be misestimated, but considering morphologic factors might improve the diagnostic rate.
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Affiliation(s)
- Takahiro Maeda
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Shinichi Kuriyama
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Takayuki Ito
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Naoki Umatani
- Department of Orthopaedic Surgery, Kansai Electric Power Hospital, Osaka, Japan
| | - Kohei Nishitani
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Shinichiro Nakamura
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Shuichi Matsuda
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Ichiyanagi K, Kuriyama S, Sakai S, Maeda T, Yamawaki Y, Nishitani K, Nakamura S, Matsuda S. Small medial proximal tibial angle is a radiographic finding strongly associated with less coronal alignment correction under valgus stress in medial knee osteoarthritis. Knee Surg Sports Traumatol Arthrosc 2024; 32:645-655. [PMID: 38409922 DOI: 10.1002/ksa.12095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 01/27/2024] [Accepted: 01/29/2024] [Indexed: 02/28/2024]
Abstract
PURPOSE The degree to which varus knees can be corrected manually is important when considering total versus unicompartmental knee arthroplasty (UKA). The primary aim was to clarify the relationship between the degree of coronal alignment correction and radiographic parameters involved in UKA prognosis using preoperative full-length lower extremity valgus stress radiography. The secondary aim was to identify the factors affecting alignment correction. METHODS This retrospective observational study included 115 knees with medial osteoarthritis that underwent knee osteotomy or arthroplasty. Percent mechanical axis without valgus stress (%MA: neutral, 50%; varus, <50% and valgus, >50%), mechanical lateral distal femoral angle, lateral bowing femoral angle, medial proximal tibial angle (MPTA), joint line convergence angle, medial and lateral joint space width (LJSW) and medial femoral and tibial joint osteophyte size were measured using preoperative full-length weight-bearing radiographs. Correlation and multiple linear regression analyses were used to assess associations between parameters and %MA with valgus stress or amount of %MA change (%MA with valgus stress minus %MA without valgus stress). RESULTS %MA with valgus stress was correlated with all radiographic parameters. %MA change was correlated with parameters except for MPTA and LJSW. Multiple regression analyses showed that %MA without valgus stress and MPTA were associated with both %MA with valgus stress and %MA change. When %MA with valgus stress was set at 30%, 40% and 50%, MPTA cutoff values were 81.6°, 83.5° and 84.9°, and cutoffs for %MA without valgus stress were 10.7%, 17.1% and 25.1%, respectively. CONCLUSION Small MPTA is strongly associated with less alignment correction under valgus stress in varus knees. The finding is useful in surgical planning, especially to avoid undercorrection with UKA when valgus stress radiographs are unavailable. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
- Kazuki Ichiyanagi
- Department of Orthopedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Shinichi Kuriyama
- Department of Orthopedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Sayako Sakai
- Department of Orthopedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Takahiro Maeda
- Department of Orthopedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yusuke Yamawaki
- Department of Orthopedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Kohei Nishitani
- Department of Orthopedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Shinichiro Nakamura
- Department of Orthopedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Shuichi Matsuda
- Department of Orthopedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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Schadow JE, Maxey D, Smith TO, Finnilä MAJ, Manske SL, Segal NA, Wong AKO, Davey RA, Turmezei T, Stok KS. Systematic review of computed tomography parameters used for the assessment of subchondral bone in osteoarthritis. Bone 2024; 178:116948. [PMID: 37926204 DOI: 10.1016/j.bone.2023.116948] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 10/04/2023] [Accepted: 10/19/2023] [Indexed: 11/07/2023]
Abstract
OBJECTIVE To systematically review the published parameters for the assessment of subchondral bone in human osteoarthritis (OA) using computed tomography (CT) and gain an overview of current practices and standards. DESIGN A literature search of Medline, Embase and Cochrane Library databases was performed with search strategies tailored to each database (search from 2010 to January 2023). The search results were screened independently by two reviewers against pre-determined inclusion and exclusion criteria. Studies were deemed eligible if conducted in vivo/ex vivo in human adults (>18 years) using any type of CT to assess subchondral bone in OA. Extracted data from eligible studies were compiled in a qualitative summary and formal narrative synthesis. RESULTS This analysis included 202 studies. Four groups of CT modalities were identified to have been used for subchondral bone assessment in OA across nine anatomical locations. Subchondral bone parameters measuring similar features of OA were combined in six categories: (i) microstructure, (ii) bone adaptation, (iii) gross morphology (iv) mineralisation, (v) joint space, and (vi) mechanical properties. CONCLUSIONS Clinically meaningful parameter categories were identified as well as categories with the potential to become relevant in the clinical field. Furthermore, we stress the importance of quantification of parameters to improve their sensitivity and reliability for the evaluation of OA disease progression and the need for standardised measurement methods to improve their clinical value.
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Affiliation(s)
- Jemima E Schadow
- Department of Biomedical Engineering, The University of Melbourne, Melbourne, Australia.
| | - David Maxey
- Department of Radiology, Norfolk and Norwich University Hospitals NHS Foundation Trust, Norwich, United Kingdom.
| | - Toby O Smith
- Warwick Medical School, University of Warwick, United Kingdom.
| | - Mikko A J Finnilä
- Research Unit of Health Science and Technology, Faculty of Medicine, University of Oulu, Oulu, Finland.
| | - Sarah L Manske
- Department of Radiology, McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, Canada.
| | - Neil A Segal
- Department of Rehabilitation Medicine, The University of Kansas Medical Center, Kansas City, United States.
| | - Andy Kin On Wong
- Joint Department of Medical Imaging, University Health Network, Toronto, Canada; Schroeder's Arthritis Institute, Toronto General Hospital Research Institute, University Health Network, Toronto, Canada.
| | - Rachel A Davey
- Department of Medicine, Austin Health, University of Melbourne, Melbourne, Australia.
| | - Tom Turmezei
- Department of Radiology, Norfolk and Norwich University Hospitals NHS Foundation Trust, Norwich, United Kingdom; Norwich Medical School, University of East Anglia, Norwich, United Kingdom.
| | - Kathryn S Stok
- Department of Biomedical Engineering, The University of Melbourne, Melbourne, Australia.
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Kinsey TL, Melton C, Mahoney OM. Posterior Compartment Debridement and Varus Deformity Correction in Total Knee Arthroplasty. J Arthroplasty 2023; 38:S164-S168. [PMID: 37019315 DOI: 10.1016/j.arth.2023.03.075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 03/26/2023] [Accepted: 03/26/2023] [Indexed: 04/07/2023] Open
Abstract
BACKGROUND Restoration of joint-line position and deformity correction remain important tenets for preserving stability and function after total knee arthroplasty (TKA). We sought to characterize the role of posterior osteophytes in the correction of alignment deformity during TKA. METHODS We evaluated 57 patients (57 TKAs) who participated in a trial of robotic-arm assisted TKA outcomes. Weight-bearing and fixed preoperative alignment was measured using long-standing radiographs and tools of the robotic-arm tracking system, respectively. Total volume (cm2) of posterior osteophytes was quantified using preoperative planning computed tomography scans. Joint line position was evaluated using bone resection thicknesses measured using a caliper. RESULTS The mean (minimum to maximum) initial fixed deformity was 4 degrees (range, 0 to 11) of varus. All patients showed asymmetric posterior osteophytes. Mean total osteophyte volume was 3 cm3 (range, 1 to 9). Total osteophyte volume was positively correlated with severity of fixed deformity (r=0.48, P=0.0001). Removal of osteophytes allowed for the correction of functional alignment to within three degrees of neutral in all cases (mean 0 deg), with none requiring release of the superficial medial collateral ligament. Tibial joint line position was restored to within 3 millimeters in all but 2 cases (mean increase of height, 0.6 (range, -4 to +5)). CONCLUSION In the end-stage diseased knee, posterior osteophytes typically occupy space in the posterior capsule on the concave side of the deformity. Thorough debridement of posterior osteophytes may help facilitate management of modest varus deformity with decreased need for soft-tissue releases or adjustments to planned bone resection.
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Affiliation(s)
- Tracy L Kinsey
- Athens Orthopedic Clinic, Athens, GA; Department of Orthopedics, Medical College of Georgia, Augusta GA
| | - Chris Melton
- Department of Orthopedics, Medical College of Georgia, Augusta GA
| | - Ormonde M Mahoney
- Athens Orthopedic Clinic, Athens, GA; Department of Orthopedics, Medical College of Georgia, Augusta GA.
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Faber BG, Ebsim R, Saunders FR, Frysz M, Lindner C, Gregory JS, Aspden RM, Harvey NC, Smith GD, Cootes T, Tobias JH. Osteophyte size and location on hip DXA scans are associated with hip pain: Findings from a cross sectional study in UK Biobank. Bone 2021; 153:116146. [PMID: 34389476 PMCID: PMC8503366 DOI: 10.1016/j.bone.2021.116146] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 07/27/2021] [Accepted: 08/06/2021] [Indexed: 11/17/2022]
Abstract
OBJECTIVE It remains unclear how the different features of radiographic hip osteoarthritis (rHOA) contribute to hip pain. We examined the relationship between rHOA, including its individual components, and hip pain using a novel dual-energy x-ray absorptiometry (DXA)-based method. METHODS Hip DXAs were obtained from UK Biobank. A novel automated method obtained minimum joint space width (mJSW) from points placed around the femoral head and acetabulum. Osteophyte areas at the lateral acetabulum, superior and inferior femoral head were derived manually. Semi-quantitative measures of osteophytes and joint space narrowing (JSN) were combined to define rHOA. Logistic regression was used to examine the relationships between these variables and hip pain, obtained via questionnaires. RESULTS 6807 hip DXAs were examined. rHOA was present in 353 (5.2%) individuals and was associated with hip pain [OR 2.42 (1.78-3.29)] and hospital diagnosed OA [6.01 (2.98-12.16)]. Total osteophyte area but not mJSW was associated with hip pain in mutually adjusted models [1.31 (1.23-1.39), 0.95 (0.87-1.04) respectively]. On the other hand, JSN as a categorical variable showed weak associations between grade ≥ 1 and grade ≥ 2 JSN with hip pain [1.30 (1.06-1.60), 1.80 (1.34-2.42) respectively]. Acetabular, superior and inferior femoral osteophyte areas were all independently associated with hip pain [1.13 (1.06-1.20), 1.13 (1.05-1.24), 1.10 (1.03-1.17) respectively]. CONCLUSION In this cohort, the relationship between rHOA and prevalent hip pain was explained by 2-dimensional osteophyte area, but not by the apparent mJSW. Osteophytes at different locations showed important, potentially independent, associations with hip pain, possibly reflecting the contribution of distinct biomechanical pathways.
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Affiliation(s)
- Benjamin G Faber
- Musculoskeletal Research Unit, University of Bristol, UK; Medical Research Council Integrative Epidemiology Unit, University of Bristol, UK.
| | - Raja Ebsim
- Division of Informatics, Imaging and Data Science, University of Manchester, UK
| | - Fiona R Saunders
- Centre for Arthritis and Musculoskeletal Health, University of Aberdeen, UK
| | - Monika Frysz
- Musculoskeletal Research Unit, University of Bristol, UK; Medical Research Council Integrative Epidemiology Unit, University of Bristol, UK
| | - Claudia Lindner
- Division of Informatics, Imaging and Data Science, University of Manchester, UK
| | - Jennifer S Gregory
- Centre for Arthritis and Musculoskeletal Health, University of Aberdeen, UK
| | - Richard M Aspden
- Centre for Arthritis and Musculoskeletal Health, University of Aberdeen, UK
| | - Nicholas C Harvey
- Medical Research Council Lifecourse Epidemiology Unit, University of Southampton, UK
| | - George Davey Smith
- Medical Research Council Integrative Epidemiology Unit, University of Bristol, UK
| | - Timothy Cootes
- Division of Informatics, Imaging and Data Science, University of Manchester, UK
| | - Jonathan H Tobias
- Musculoskeletal Research Unit, University of Bristol, UK; Medical Research Council Integrative Epidemiology Unit, University of Bristol, UK
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Omoumi P, Schuler A, Babel H, Stoffel C, Jolles BM, Favre J. Proximal tibial osteophyte volumes are correlated spatially and with knee alignment: a quantitative analysis suggesting the influence of biochemical and mechanical factors in the development of osteophytes. Osteoarthritis Cartilage 2021; 29:1691-1700. [PMID: 34571138 DOI: 10.1016/j.joca.2021.09.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 08/16/2021] [Accepted: 09/17/2021] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To characterize the differences and correlations in osteophyte volumes between and within proximal tibial compartments, and to assess the correlations between osteophyte volumes and the femorotibial angle. DESIGN CT scans of 73 knees with predominantly medial femorotibial osteoarthritis (21 K/L2, 28 K/L3, 24 K/L4) were retrospectively analyzed using a new, reproducible method measuring total and subregional osteophyte volumes in the medial and lateral compartments. Non-parametric statistics was used for comparison and correlation analyses. RESULTS Total osteophyte volumes were larger in the medial than in the lateral compartment for all severity groups (p < 0.05). Additionally, statistically significant differences were observed among subregions of the lateral compartment in K/L3 and K/L4 knees. Statistically significant positive correlations were found between the medial and lateral total osteophyte volumes in K/L3 and K/L4 knees (ρ ≥ 0.44, p = 0.03), and among most subregional osteophyte volumes within each compartment in K/L3 knees. Markedly fewer statistically significant correlations were present in K/L2 and K/L4 knees. In K/L3 knees, the femorotibial angle was statistically significantly positively correlated with the total osteophyte volume in the medial compartment (ρ = 0.50, p = 0.01), with osteophyte volumes in most medial subregions, and with the osteophyte volume in the lateral posterior subregion (ρ = 0.40, p = 0.05). CONCLUSIONS Quantitative assessment of osteophytes may bring insight on factors influencing their development. Positive correlations of osteophyte volumes found between and within compartments suggest the influence of biochemical mediators acting on the entire joint, while positive correlations between the femorotibial angle and osteophyte volumes suggest a role of mechanical factors. These hypotheses are to be further confirmed.
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Affiliation(s)
- P Omoumi
- Lausanne University Hospital and University of Lausanne (CHUV-UNIL), Department of Diagnostic and Interventional Radiology, Lausanne, Switzerland; Cliniques Universitaires St Luc - UC Louvain, Department of Radiology, Brussels, Belgium.
| | - A Schuler
- Lausanne University Hospital and University of Lausanne (CHUV-UNIL), Department of Musculoskeletal Medicine, Swiss BioMotion Lab, Lausanne, Switzerland
| | - H Babel
- Lausanne University Hospital and University of Lausanne (CHUV-UNIL), Department of Musculoskeletal Medicine, Swiss BioMotion Lab, Lausanne, Switzerland
| | - C Stoffel
- Lausanne University Hospital and University of Lausanne (CHUV-UNIL), Department of Musculoskeletal Medicine, Swiss BioMotion Lab, Lausanne, Switzerland
| | - B M Jolles
- Lausanne University Hospital and University of Lausanne (CHUV-UNIL), Department of Musculoskeletal Medicine, Swiss BioMotion Lab, Lausanne, Switzerland; Ecole Polytechnique Fédérale Lausanne (EPFL), Institute of Microengineering, Lausanne, Switzerland
| | - J Favre
- Ecole Polytechnique Fédérale Lausanne (EPFL), Institute of Microengineering, Lausanne, Switzerland
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