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Zhan H, Kang X, Zhang X, Zhang Y, Wang Y, Yang J, Zhang K, Han J, Feng Z, Zhang L, Wu M, Xia Y, Jiang J. Machine-Learning Models Reliably Predict Clinical Outcomes in Medial Patellofemoral Ligament Reconstruction. Arthroscopy 2024:S0749-8063(24)00556-5. [PMID: 39128684 DOI: 10.1016/j.arthro.2024.07.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 07/17/2024] [Accepted: 07/17/2024] [Indexed: 08/13/2024]
Abstract
PURPOSE To develop a machine-learning model to predict clinical outcomes after medial patellofemoral ligament reconstruction (MPFLR) and identify the important predictive indicators. METHODS This study included patients who underwent MPFLR from January 2018 to December 2022. The exclusion criteria were as follows: (1) concurrent bony procedures, (2) history of other knee surgeries, and (3) follow-up period of less than 12 months. Forty-two predictive models were constructed for 7 clinical outcomes (failure to achieve minimum clinically important difference of clinical scores, return to preinjury sports, pivoting sports, and recurrent instability) using 6 machine-learning algorithms (random forest, logistic regression, support vector machine, decision tree, implemented multilayer perceptron, and K-nearest neighbor). The performance of the model was evaluated using metrics such as the area under the receiver operating characteristic curve, accuracy, specificity, and sensitivity. In addition, SHapley Additive exPlanation summary plot was employed to identify the important predictive factors of the best-performing model. RESULTS A total of 218 patients met criteria. For the best-performing models in predicting failure to achieve the minimum clinically important difference for Lysholm, International Knee Documentation Committee, Kujala, and Tegner scores, the area under the receiver operating characteristic curves and accuracies were 0.884 (good) and 87.3%, 0.859 (good) and 86.2%, 0.969 (excellent) and 97.0%, and 0.760 (fair) and 76.8%, respectively; 0.952 (excellent) and 95.2% for return to preinjury sports; 0.756 (fair) and 75.4% for return to pivoting sports; and 0.943 (excellent) and 94.9% for recurrent instability. Low preoperative Tegner score, shorter time to surgery, and absence of severe trochlear dysplasia were significant predictors for return to preinjury sports, whereas the absence of severe trochlear dysplasia and patellar alta were significant predictors for return to pivoting sports. Older age, female sex, and low preoperative Lysholm score were highly predictive of recurrent instability. CONCLUSIONS The predictive models developed using machine-learning algorithms can reliably forecast the clinical outcomes of MPFLR, particularly demonstrating excellent performance in predicting recurrent instability. LEVEL OF EVIDENCE Level III, case-control study.
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Affiliation(s)
- Hongwei Zhan
- Department of Sports Medicine, Honghui Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China. https://facebook.com/100091611350229
| | - Xin Kang
- Department of Sports Medicine, Honghui Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Xiaobo Zhang
- Department of Sports Medicine, Honghui Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Yuji Zhang
- Lanzhou University Second Hospital, Orthopaedic Clinical Research Center of Gansu Province, Intelligent Orthopaedic Industry Technology Center of Gansu Province, Lanzhou Gansu, China
| | - Yanming Wang
- Second School of Clinical Medicine, Lanzhou University, Lanzhou, Gansu, China
| | - Jing Yang
- Second School of Clinical Medicine, Lanzhou University, Lanzhou, Gansu, China
| | - Kun Zhang
- Department of Sports Medicine, Honghui Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Jingjing Han
- Second School of Clinical Medicine, Lanzhou University, Lanzhou, Gansu, China
| | - Zhiwei Feng
- Lanzhou University Second Hospital, Orthopaedic Clinical Research Center of Gansu Province, Intelligent Orthopaedic Industry Technology Center of Gansu Province, Lanzhou Gansu, China
| | - Liang Zhang
- Department of Sports Medicine, Honghui Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Meng Wu
- Lanzhou University Second Hospital, Orthopaedic Clinical Research Center of Gansu Province, Intelligent Orthopaedic Industry Technology Center of Gansu Province, Lanzhou Gansu, China
| | - Yayi Xia
- Lanzhou University Second Hospital, Orthopaedic Clinical Research Center of Gansu Province, Intelligent Orthopaedic Industry Technology Center of Gansu Province, Lanzhou Gansu, China
| | - Jin Jiang
- Lanzhou University Second Hospital, Orthopaedic Clinical Research Center of Gansu Province, Intelligent Orthopaedic Industry Technology Center of Gansu Province, Lanzhou Gansu, China.
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Dan Milinkovic D, Schmidt S, Fluegel J, Gebhardt S, Zimmermann F, Balcarek P. Preoperative subjective assessment of disease-specific quality of life significantly influenced the likelihood of achieving the minimal clinically important difference after surgical stabilization for recurrent lateral patellar instability. Knee Surg Sports Traumatol Arthrosc 2024. [PMID: 39031883 DOI: 10.1002/ksa.12319] [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: 10/11/2023] [Revised: 05/30/2024] [Accepted: 06/06/2024] [Indexed: 07/22/2024]
Abstract
PURPOSE To evaluate which factors exert a predictive value for not reaching the minimal clinically important difference (MCID) in patients who underwent a tailored operative treatment for recurrent lateral patellar dislocation (RLPD). METHODS A total of 237 patients (male/female 71/166; 22.4 ± 6.8 years) were included. The Banff Patellofemoral Instability Instrument 2.0 (BPII 2.0) and subjective rating of knee function and pain (numeric analogue scale [NAS]; 0-10) were used to evaluate patients' outcomes from pre- to postoperatively. Gender, age at the time of surgery, body mass index (BMI), nicotine abuse, psychiatric diseases, cartilage status and pathoanatomic risk factors were evaluated as potential predictors for achieving the MCID using univariate logistic regression analysis. RESULTS The MCID for the BPII 2.0 was calculated at 9.5 points. Although the BPII 2.0 and NAS for knee function and pain improved significantly in the total cohort from pre- to postoperatively (all p < 0.001), 29 patients did not reach the MCID at the final follow-up. The analysis yielded that only the preoperative NAS for function and BPII 2.0 score values were significant predictors for reaching the MCID postoperatively. The optimal threshold was calculated at 7 (NAS function) and 65.2 points (BPII 2.0). Age at the time of surgery should be considered for patients with a preoperative BPII 2.0 score >62.5. CONCLUSION The probability of reaching BPII 2.0 MCID postoperatively depends only on the preoperative BPII 2.0 value and subjective rating of knee function, as well as age at the time of surgery for patients undergoing surgical treatment of RLPD. Here, presented results can assist clinicians in advising and presenting patients with potential outcomes following treatment for this often complex and multifactorial pathology. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
- Danko Dan Milinkovic
- Center for Musculoskeletal Surgery, Charité-University Medicine Berlin, Berlin, Germany
| | | | | | - Sebastian Gebhardt
- Center for Orthopaedics, Trauma Surgery and Rehabilitation, University of Greifswald, Greifswald, Germany
| | - Felix Zimmermann
- Berufsgenossenschaftliche Unfallklinik Ludwigshafen, Ludwigshafen am Rhein, Germany
| | - Peter Balcarek
- Arcus Sportklinik, Pforzheim, Germany
- Department of Trauma Surgery, Orthopaedics, and Plastic Surgery, University Medicine Göttingen, Göttingen, Germany
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Oeding JF, Dancy ME, Fearington FW, Pruneski JA, Pareek A, Hevesi M, Hangody L, Camp CL, Krych AJ. Autologous Osteochondral Transfer of the Knee Demonstrates Continued High Rates of Return to Sport and Low Rates of Conversion to Arthroplasty at Long-Term Follow-Up: A Systematic Review. Arthroscopy 2024; 40:1938-1949. [PMID: 38056726 DOI: 10.1016/j.arthro.2023.11.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 10/30/2023] [Accepted: 11/19/2023] [Indexed: 12/08/2023]
Abstract
PURPOSE To perform a systematic review of the literature to evaluate (1) activity level and knee function, (2) reoperation and failure rates, and (3) risk factors for reoperation and failure of autologous osteochondral transfer (AOT) at long-term follow-up. METHODS A comprehensive review of the long-term outcomes of AOT was performed. Studies reported on activity-based outcomes (Tegner Activity Scale) and clinical outcomes (Lysholm score and International Knee Documentation Committee score). Reoperation and failure rates as defined by the publishing authors were recorded for each study. Modified Coleman Methodology Scores were calculated to assess study methodological quality. RESULTS Twelve studies with a total of 495 patients and an average age of 32.5 years at the time of surgery and a mean follow-up of 15.1 years (range, 10.4-18.0 years) were included. The mean defect size was 3.2 cm2 (range, 1.9-6.9 cm2). The mean duration of symptoms before surgery was 5.1 years. Return to sport rates ranged from 86% to 100%. Conversion to arthroplasty rates ranged from 0% to 16%. The average preoperative International Knee Documentation Committee scores ranged from 32.9 to 36.8, and the average postoperative International Knee Documentation Committee scores at final follow-up ranged from 66.3 to 77.3. The average preoperative Lysholm scores ranged from 44.5 to 56.0 and the average postoperative Lysholm scores ranged from 70.0 to 96.5. The average preoperative Tegner scores ranged from 2.5 to 3.0, and the average postoperative scores ranged from 4.1 to 7.0. CONCLUSIONS AOT of the knee resulted in high rates of return to sport with correspondingly low rates of conversion to arthroplasty at long-term follow-up. In addition, AOT demonstrated significant improvements in long-term patient-reported outcomes from baseline. LEVEL OF EVIDENCE Level IV, systematic review of Level I-IV studies.
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Affiliation(s)
- Jacob F Oeding
- School of Medicine, Mayo Clinic Alix School of Medicine, Rochester, Minnesota, U.S.A..
| | - Malik E Dancy
- Department of Orthopedic Surgery and Sports Medicine, Mayo Clinic, Rochester, Minnesota, U.S.A
| | - Forrest W Fearington
- School of Medicine, Mayo Clinic Alix School of Medicine, Rochester, Minnesota, U.S.A
| | - James A Pruneski
- Department of Orthopedic Surgery, Tripler Army Medical Center, Honolulu, Hawaii, U.S.A
| | - Ayoosh Pareek
- Sports Medicine and Shoulder Service, Hospital for Special Surgery, New York, New York, U.S.A
| | - Mario Hevesi
- Department of Orthopedic Surgery and Sports Medicine, Mayo Clinic, Rochester, Minnesota, U.S.A
| | - Laszlo Hangody
- Semmelweis University, Department of Traumatology, Uzsoki Hospital, Department of Orthopedics, Budapest, Hungary
| | - Christopher L Camp
- Department of Orthopedic Surgery and Sports Medicine, Mayo Clinic, Rochester, Minnesota, U.S.A
| | - Aaron J Krych
- Department of Orthopedic Surgery and Sports Medicine, Mayo Clinic, Rochester, Minnesota, U.S.A
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Figueroa F, Guiloff R, Bolton S, Figueroa D, Tapasvi S, Stocker E. Specific considerations in female patients with patellar instability: current concepts. J ISAKOS 2024; 9:457-463. [PMID: 38580053 DOI: 10.1016/j.jisako.2024.03.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Revised: 03/26/2024] [Accepted: 03/29/2024] [Indexed: 04/07/2024]
Abstract
Prior literature suggests that patellofemoral instability (PFI) is significantly more prevalent in women than in men. This higher prevalence is commonly attributed to anatomical differences between sexes, particularly with patellofemoral alignment. These differences encompass a higher rate of trochlear dysplasia (TD), patella alta, an increased Q angle, and soft tissue imbalances. In recent years, worse outcomes have been reported in female patients after patellofemoral stabilization surgery using medial patellofemoral ligament reconstruction (MPFLr) alone or in combination with a tibial tubercle osteotomy (TTO), for this reason an "à la carte" plan (addressing the individuals anatomical risk factors) could be more appropriate for female patients.
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Affiliation(s)
- Francisco Figueroa
- Clinica Alemana-Universidad del Desarrollo, 7650568, Chile; Hospital Sotero del Rio, 8207257, Chile.
| | - Rodrigo Guiloff
- Clinica Alemana-Universidad del Desarrollo, 7650568, Chile; Hospital Sotero del Rio, 8207257, Chile.
| | - Sarah Bolton
- Fortius Clinic, W1H 6EQ, UK; Chelsea & Westminster Hospital, SW10 9NH, UK.
| | - David Figueroa
- Clinica Alemana-Universidad del Desarrollo, 7650568, Chile.
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Li ZI, Garra S, Eskenazi J, Montgomery SR, Triana J, Hughes AJ, Alaia MJ, Strauss EJ, Jazrawi LM, Campbell KA. Patients who undergo tibial tubercle anteromedialization with medial patellofemoral ligament reconstruction demonstrate similar rates of return to sport compared to isolated MPFL reconstruction. Knee Surg Sports Traumatol Arthrosc 2024; 32:371-380. [PMID: 38270287 DOI: 10.1002/ksa.12051] [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: 11/29/2023] [Accepted: 01/02/2024] [Indexed: 01/26/2024]
Abstract
PURPOSE To investigate the rate of return to sports and sport psychological readiness between patients who underwent isolated MPFLR (iMPFLR) compared to a matched cohort of patients who underwent MPFLR with anteromedializing tibial tubercle osteotomy (MPFLR/TTO). METHODS Patients who underwent primary MPFLR with or without TTO for recurrent patellar instability were retrospectively reviewed from 2012 to 2020 at a single institution. Preinjury sport and work information, Kujala, Tegner, Visual Analogue Score for pain, satisfaction and MPFL-Return to Sport after Injury (MPFL-RSI) score were collected. Two readers independently measured the tibial tuberosity-trochlear groove distance, Caton-Deschamps index and Dejour classification for trochlear dysplasia. Patients in iMPFLR and MPFLR/TTO groups were matched 1:1 on age, sex, body mass index and follow-up length. Multivariate regression analysis was performed to determine whether the MPFL-RSI was associated with a return to sport. RESULTS This study included 74 patients at mean follow-up of 52.5 months (range: 24-117). These groups returned to sport at similar rates (iMPFLR: 67.6%, MPFLR/TTO: 73.0%, not significant [ns]), though iMPFLR patients returned more quickly (8.4 vs. 12.8 months, p = 0.019). Rates of return to preinjury sport level were also similar (45.9% vs. 40.5%, ns). Patients with Dejour B/C took more time to return to sport compared to patients with mild/no trochlear pathology (13.8 vs. 7.9 months, p = 0.003). Increasing MPFL-RSI score was significantly predictive of the overall return to sport (odds ratio [OR]: 1.08, 95% confidence interval [CI] [1.03, 1.13], p < 0.001) and return to preinjury level (OR: 1.07, 95% CI [1.04, 1.13], p < 0.001). Most patients in iMPFLR and MPFLR/TTO groups resumed work (95.7% vs. 88.5%, ns), though iMPFLR patients who returned to preinjury work levels did so more quickly (1.7 vs. 4.6 months, p = 0.005). CONCLUSION Patients who underwent MPFLR with anteromedializing TTO demonstrated similar rates of return to sport and psychological readiness compared to an isolated MPFLR matched comparison group, though iMPFLRs returned more quickly. Patients with more severe trochlear pathology required more time to return to sports. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
- Zachary I Li
- Department of Orthopedic Surgery, New York University Langone Health, New York, New York, USA
| | - Sharif Garra
- Department of Orthopedic Surgery, New York University Langone Health, New York, New York, USA
- Division of Orthopedic Surgery, Tel-Hashomer "Sheba" Medical Center, Tel-Aviv University, Ramat Gan, Israel
| | - Jordan Eskenazi
- Department of Orthopedic Surgery, New York University Langone Health, New York, New York, USA
| | - Samuel R Montgomery
- Department of Orthopedic Surgery, New York University Langone Health, New York, New York, USA
| | - Jairo Triana
- Department of Orthopedic Surgery, New York University Langone Health, New York, New York, USA
| | - Andrew J Hughes
- Department of Orthopedic Surgery, New York University Langone Health, New York, New York, USA
| | - Michael J Alaia
- Department of Orthopedic Surgery, New York University Langone Health, New York, New York, USA
| | - Eric J Strauss
- Department of Orthopedic Surgery, New York University Langone Health, New York, New York, USA
| | - Laith M Jazrawi
- Department of Orthopedic Surgery, New York University Langone Health, New York, New York, USA
| | - Kirk A Campbell
- Department of Orthopedic Surgery, New York University Langone Health, New York, New York, USA
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Tanaka MJ, Sodhi A, Wadhavkar I, Kane K, Velasquez Hammerle MV, Mangudi Varadarajan K, Tornetta P. Redefining Trochlear Dysplasia: Normal Thresholds Vary by Measurement Technique, Landmarks, and Sex. Am J Sports Med 2023; 51:1202-1210. [PMID: 36942723 DOI: 10.1177/03635465231158099] [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] [Indexed: 03/23/2023]
Abstract
BACKGROUND Trochlear dysplasia is a known risk factor for patellar instability. Multiple radiographic measurements exist to assess trochlear morphology, but the optimal measurement technique and threshold for instability are unknown. PURPOSE To describe the optimal measurements and thresholds for trochlear dysplasia on magnetic resonance imaging (MRI) that can identify knees with patellar instability in male and female patients. STUDY DESIGN Cohort study (diagnosis); Level of evidence, 3. METHODS Knee MRI scans of patients with patellar instability were compared with those of age- and sex-matched controls. Measurements of the sulcus angle, lateral trochlear inclination (LTI), and trochlear depth were performed on axial images using bony and cartilaginous landmarks. Receiver operating characteristic curve analysis was performed, with the area under the curve (AUC) describing the accuracy of each diagnostic test. Optimal cutoff values were calculated to distinguish between knees with and without patellar instability. AUC and cutoff values were reported for each measurement as well as for male and female subgroups. RESULTS A total of 238 knee MRI scans were included in this study (138 female, 100 male; age range, 18-39 years). Trochlear depth measurements had the greatest diagnostic value, with AUCs of 0.79 and 0.82 on bone and cartilage, respectively. All measurements (sulcus angle, LTI, trochlear depth) on bone and cartilage had an AUC ≥0.7 (range, 0.70-0.86), with optimal cutoff values of 145° (bone) and 154° (cartilage) for the sulcus angle, 17° (bone) and 13° (cartilage) for LTI, and 4 mm (bone) and 3 mm (cartilage) for trochlear depth. Optimal cutoff values in female patients varied from those in male patients for all measurements except for cartilaginous trochlear depth. CONCLUSION Normal thresholds for trochlear dysplasia varied based on the use of bony versus cartilaginous landmarks. Cartilaginous trochlear depth measurements had the greatest ability to identify knees with patellar instability. Furthermore, optimal cutoff values for all measurements except for cartilaginous trochlear depth differed between female and male patients. These findings suggest that sex-specific parameters of normal values may be needed in the assessment of risk factors for patellofemoral instability.
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Affiliation(s)
- Miho J Tanaka
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
- Department of Orthopaedic Surgery, Boston University Medical Center, Boston, Massachusetts, USA
| | - Alisha Sodhi
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
- Department of Orthopaedic Surgery, Boston University Medical Center, Boston, Massachusetts, USA
| | - Isha Wadhavkar
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
- Department of Orthopaedic Surgery, Boston University Medical Center, Boston, Massachusetts, USA
| | - Kylynn Kane
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
- Department of Orthopaedic Surgery, Boston University Medical Center, Boston, Massachusetts, USA
| | - Maria V Velasquez Hammerle
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
- Department of Orthopaedic Surgery, Boston University Medical Center, Boston, Massachusetts, USA
| | - Kartik Mangudi Varadarajan
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
- Department of Orthopaedic Surgery, Boston University Medical Center, Boston, Massachusetts, USA
| | - Paul Tornetta
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
- Department of Orthopaedic Surgery, Boston University Medical Center, Boston, Massachusetts, USA
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Hodel S, Torrez C, Hoch A, Fürnstahl P, Vlachopoulos L, Fucentese SF. Increased femoral curvature and trochlea flexion in high-grade patellofemoral dysplastic knees. Knee Surg Sports Traumatol Arthrosc 2022; 31:1361-1369. [PMID: 35920842 DOI: 10.1007/s00167-022-07080-6] [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: 03/02/2022] [Accepted: 07/18/2022] [Indexed: 11/24/2022]
Abstract
PURPOSE High-grade patellofemoral dysplasia is often associated with concomitant axial and frontal leg malalignment. However, curvature of the femur and sagittal flexion of the trochlea has not yet been studied in patellofemoral dysplastic knees. The aim of the study was to quantify the femoral curvature and sagittal flexion of the trochlea in both high-grade patellofemoral dysplastic and healthy knees. METHODS A retrospective case-control study matched 19 high-grade patellofemoral dysplastic knees (Dejour types C and D) with 19 healthy knees according to sex and body mass index. Three-dimensional (3D) femoral curvature and sagittal trochlea flexion were analysed. To analyse femoral curvature, the specific 3D radius of curvature (ROC) was calculated. Trochlear flexion was quantified through the development of the trochlea flexion angle (TFA), which is a novel 3D measurement in relation to the anatomical and mechanical femur axis and is referred to as 3D TFAanatomic and 3D TFAmech. The influence of age, gender, height, weight and frontal and axial alignment on ROC and TFA was analysed in a multiple regression model. RESULTS Overall ROC was significantly smaller in dysplastic knees, compared with the control group [898.4 ± 210.8 mm (range 452.9-1275.1 mm) vs 1308.4 ± 380.5 mm (range 878.3-2315.8 mm), p < 0.001]. TFA was significantly higher in dysplastic knees, compared with the control group, for 3D TFAmech [13.8 ± 7.2° (range 4.4-33.4°) vs 6.5 ± 2.3° (range 0.8-10.2°), p < 0.001] and 3D TFAanatomic [12.5 ± 7.2° (range 3.1-32.2°) vs 6.4 ± 1.9° (range 2.1-9.1°), p = 0.001]. A smaller ROC was associated with smaller height, female gender and higher femoral ante torsion. An increased TFA was associated with valgus malalignment. CONCLUSION High-grade patellofemoral dysplastic knees demonstrated increased femoral curvature and sagittal flexion of the trochlea, compared with healthy knees. The ROC and newly described TFA allowed the quantification of the sagittal femoral deformity. TFA and ROC should be incorporated in future deformity analysis to investigate their potential as a target for surgical correction. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
- Sandro Hodel
- Department of Orthopedics, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland.
| | - Carlos Torrez
- Department of Orthopedics, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland
| | - Armando Hoch
- Department of Orthopedics, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland
| | - Philipp Fürnstahl
- Head of Research in Orthopedic Computer Science (ROCS), University Hospital Balgrist, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland
| | - Lazaros Vlachopoulos
- Department of Orthopedics, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland
| | - Sandro F Fucentese
- Department of Orthopedics, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland
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