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Abelleyra Lastoria DA, Hutchinson K, Tapadar T, Ahmad S, Smith T, Nicolaou N, Hing CB. Patho-morphology of patellar instability in children and adolescents: A systematic review and meta-analysis. Knee 2024; 48:166-196. [PMID: 38657526 DOI: 10.1016/j.knee.2024.03.009] [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: 01/15/2024] [Revised: 03/25/2024] [Accepted: 03/27/2024] [Indexed: 04/26/2024]
Abstract
BACKGROUND Children and adolescents have the highest incidence of patellar instability among the population. We aimed to identify patho-morphological and epidemiological factors associated with patellar instability, and to identify factors predisposing to recurrence in children and adolescents. METHODS Published and unpublished literature databases, conference proceedings and the reference lists of included studies were searched to the 14th of March 2024. Studies were eligible if they compared history characteristics, examination features and radiological parameters between patients with and without instability, or evaluated risk factors for instability recurrence. A random-effects meta-analysis was performed. Included studies were appraised using tools respective of study design. RESULTS The evidence was moderate to low in quality. Forty-five studies (including 9000 patients) were eligible. Tibial tubercle - tibial groove (TT-TG) distance (weighted mean difference [WMD] 5.96 mm, 95% Confidence Interval [CI]: 4.94 to 6.99 mm), sulcus angle (WMD: 13.93˚, 95% CI: 9.1˚ to 18.8˚), and Insall-Salvati index (WMD: 0.2, 95% CI: 0.16 to 0.23) were greater in patients with patellar instability. Risk factors for recurrent dislocation included age less than 18 years (Odds ratio [OR]: 2.56, 95% CI: 1.63 to 4.0), skeletal immaturity (OR: 1.79, 95% CI: 1.21 to 2.64) and presence of trochlear dysplasia (OR: 3.37, 95% CI: 1.85 to 6.15). CONCLUSION Knowledge of patho-morphological factors associated with patellar instability could help explain its pathophysiological processes, allowing for the design of treatment approaches and the identification of patients at risk.
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Affiliation(s)
| | | | - Thabia Tapadar
- St George's University of London, London SW17 0RE, United Kingdom
| | - Salwa Ahmad
- St George's University of London, London SW17 0RE, United Kingdom
| | - Toby Smith
- University of Warwick, Coventry CV4 7HL, United Kingdom
| | - Nicolas Nicolaou
- Sheffield Children's Hospital, Sheffield S10 2TH, United Kingdom
| | - Caroline Blanca Hing
- St George's University Hospitals NHS Foundation Trust, London SW17 0RE, United Kingdom
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Hinckel B, Smith J, Tanaka MJ, Matsushita T, Martinez-Cano JP. Patellofemoral instability part 1 (When to operate and soft tissue procedures): State of the art. J ISAKOS 2024:S2059-7754(24)00100-7. [PMID: 38795864 DOI: 10.1016/j.jisako.2024.05.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Revised: 04/29/2024] [Accepted: 05/20/2024] [Indexed: 05/28/2024]
Abstract
Patellofemoral instability is usually initially treated non-operatively. Surgery is considered in patients with recurrent patellar dislocation and after a first-time patellar dislocation in the presence of either an associated osteochondral fracture or high risk of recurrence. Stratifying the risk of recurrence includes evaluating risk factors such as age, trochlear dysplasia, contralateral dislocation, and patellar height. Surgery with soft tissue procedures includes restoring the medial patellar restraints and balancing the lateral side of the joint. Reconstruction of the medial patellofemoral ligament is the most frequent way of addressing the medial soft tissues in patients with patellofemoral instability. Meanwhile, lateral tightness can be achieved by lateral retinaculum lengthening or release. Approaching patellofemoral instability in a patient-specific approach, combined with a shared decision-making process with the patient/family, will guide surgeons to the deliver optimal care for the patellar instability patient.
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Affiliation(s)
- Betina Hinckel
- Department of Orthopaedic Surgery, William Beaumont Hospital, Royal Oak, MI, USA
| | - Justin Smith
- Atrium Health Musculoskeletal Institute & Sports Medicine, Rock Hill, SC, USA
| | - Miho J Tanaka
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Takehiko Matsushita
- Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
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İğrek S, Şahbat Y, Koç E, Çeliksöz AH, Topkar OM. Patellar Lateralization, Absence of Joint Hypermobility, and the Mechanism of Injury Are Associated With Osteochondral Fracture After First-time Acute Lateral Patellar Dislocation in Adolescents: An MRI-based Evaluation. J Pediatr Orthop 2024; 44:273-280. [PMID: 38323412 DOI: 10.1097/bpo.0000000000002629] [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] [Indexed: 02/08/2024]
Abstract
BACKGROUND Although the risk factors for patellofemoral dislocation are clearly defined, risk factors for osteochondral fracture (OCF) after patellar dislocation are not as well defined. The aim of this study was to investigate the risk factors for OCF by evaluating patients with and without OCF after first-time acute patellar dislocation. METHODS This multicenter study was conducted as a retrospective examination of the radiologic measurements on the magnetic resonance imaging of 306 patients. The patients were divided into the OCF group and non-OCF group, and OCFs were grouped according to whether the fracture was in the patella or femur. Patellar height, patellar lateralization, trochlear morphology, patellofemoral matching, and patella types were evaluated on patient magnetic resonance imaging. The presence of joint hypermobility in the patients was determined according to the Beighton scale score. The injury mechanisms of the patients were grouped as sports-related injuries, injuries resulting from simple falls, and injuries during daily activities. RESULTS A total of 120 OCFs were detected in 108 (35.2%) patients, of which 96 (80%) were in the patella and 24 (20%) in the femur. The rate of OCF after sports-related injuries was found to be significantly higher than in other injury mechanisms ( P =0.001). More joint hypermobility was detected in patients without OCF ( P =0.041). The measurements of tibial tubercle-trochlear groove, tibial tubercle-posterior cruciate ligament distance and lateral patellar displacement were statistically higher in cases with OCF ( P =0.001). In patients with normal joint mobility, the rate of OCF localization in the patella was significantly higher ( P =0.035). No correlation was found between any other parameters and OCF ( P >0.05). The absence of joint hypermobility and the measurements of tibial tubercle-trochlear groove distance, tibial tubercle-posterior cruciate ligament distance, and lateral patellar displacement were independent risk factors for the incidence of OCF according to the logistic regression analysis. CONCLUSIONS The absence of joint hypermobility and patellar lateralization are independent risk factors for the occurrence of OCF after first-time patellar dislocation. Sports-related injury is a nonindependent risk factor for the presence of OCF. In patients with normal joint mobility, the incidence of OCF in the patella is higher than in the femur. These important factors should be considered when evaluating patients and starting their treatment. LEVEL OF EVIDENCE Level III-retrospective cohort study.
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Affiliation(s)
- Servet İğrek
- Department of Orthopaedics and Traumatology, Kartal Dr. Lütfi Kirdar City Hospital
| | - Yavuz Şahbat
- Department of Orthopaedics and Traumatology, Erzurum Training and Research Hospital, Erzurum
| | - Erdem Koç
- Department of Orthopaedics and Traumatology, Marmara University School of Medicine, İstanbul
| | | | - Osman Mert Topkar
- Department of Orthopaedics and Traumatology, Marmara University School of Medicine, İstanbul
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Yu J, Li Y, Zhang K, Yang R, Yang X, Gong M, Long C, Fu W. The accuracy of multiple regression models for predicting the individual risk of recurrent lateral patellar dislocation. BMC Musculoskelet Disord 2023; 24:948. [PMID: 38057697 DOI: 10.1186/s12891-023-07094-2] [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: 09/20/2023] [Accepted: 12/04/2023] [Indexed: 12/08/2023] Open
Abstract
BACKGROUND Recurrent lateral patellar dislocation (RLPD) poses a significant threat to patients' quality of life due to knee pain, patellofemoral cartilage damage, and potential traumatic arthritis. Predictive scoring systems have been developed to assess the risk of RLPD; however, their relative accuracy remains uncertain. PURPOSE To investigate the accuracy of the multiple regression models to predict the individual risk of recurrent LPD. METHODS The Patellar Instability probability calculator (PIP), Recurrent Instability of the Patella Score (RIP), and Patellar Instability Severity Score (PIS) scoring rules were measured in 171 patients with a history of patellar dislocation and 171 healthy individuals. Three prediction models were calculated based on the data to predict the risk of recurrent lateral patellar dislocation. The inter-observer and intra-observer reliability of each measurement parameter was evaluated. The predictive capacity of the three-prediction model was investigated using the receiver operating characteristic curve. RESULTS In the case group of 171 patients, PIS accurately predicted recurrent lateral Patella dislocation in 143 patients. RIP was 96, and PIP was 83. The positive predictive values were 92.9%, 64%, and 68% respectively. In the control group of 171 patients, the PIS was validated in 160 patients who would not experience dislocations. RIP was 117, and PIP was 50. The negative predictive values were 85.1%, 60.9%, and 36.2%, respectively. The area under the curve score for the PIS was 0.866, and the RIP was 0.673. the PIP was 0.678. CONCLUSION RIP and PIP did not work to predict LPD. PIS can accurately predict recurrent lateral patellar dislocation. It can aid doctors in making treatment decisions. LEVEL OF EVIDENCE Level III, retrospective comparative study.
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Affiliation(s)
- Jiang Yu
- Department of Orthopedic Surgery/Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Yijin Li
- Laboratory of Clinical Proteomics and Metabolomics, Institutes for Systems Genetics, Frontiers Science Center for Disease-related Molecular Network, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China
| | - Kaibo Zhang
- Department of Orthopedic Surgery/Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Runze Yang
- Department of Orthopedic Surgery/Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Xiaolong Yang
- Department of Orthopedic Surgery/Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China
| | - Meng Gong
- Laboratory of Clinical Proteomics and Metabolomics, Institutes for Systems Genetics, Frontiers Science Center for Disease-related Molecular Network, National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China
| | - Cheng Long
- Department of Orthopedic Surgery/Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China.
| | - Weili Fu
- Department of Orthopedic Surgery/Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, China.
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Farrow LD, Elias JJ, Li M, Yang M, Lartey R, Winalski CS, Li X. Patellar Dislocation in Adolescent Patients: Influence on Cartilage Properties Based on T1ρ Relaxation Times. Am J Sports Med 2023; 51:3714-3723. [PMID: 37897349 PMCID: PMC11087140 DOI: 10.1177/03635465231205562] [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] [Indexed: 10/30/2023]
Abstract
BACKGROUND Adolescents who experience a patellar dislocation have an elevated risk of patellofemoral posttraumatic osteoarthritis. Magnetic resonance imaging (MRI)-based T1ρ relaxation times were measured for adolescents to evaluate patellofemoral cartilage after patellar dislocation. Long T1ρ relaxation times are an indicator of cartilage degradation. HYPOTHESIS The primary hypothesis is that patellofemoral cartilage T1ρ relaxation times will be elevated in the acute phase after patellar dislocation. The secondary hypothesis is that T1ρ relaxation times will be higher for knees with multiple rather than single dislocations due to repeated traumatic injury. STUDY DESIGN Cross-sectional study; Level of evidence, 3. METHODS In total, 23 adolescents being treated for a recent patellar dislocation, 13 for a first-time dislocation (47 ± 38 days since most recent dislocation) and 10 for multiple dislocations (55 ± 24 days since most recent dislocation), and 10 healthy controls participated in MRI-based T1ρ relaxation time mapping. For multiple regions of the patellofemoral joint, mean T1ρ values were compared between the 3 groups with multiple group comparisons and post hoc tests. T1ρ relaxation times were also correlated against measures of patellofemoral anatomy and alignment for single and multiple dislocations. Statistical significance was set at P < .05. RESULTS T1ρ relaxation times were significantly longer for injured knees (single and multiple dislocations) than controls at the medial and central patella and central trochlear groove. For the regions on the patella, significant differences between injured and control knees exceeded 15%. No significant differences were identified between single and multiple dislocations. For the initial dislocation group, T1ρ relaxation times within multiple regions of the patellofemoral joint were significantly correlated with lateral patellar alignment or patellar height. CONCLUSION Elevated patellofemoral cartilage T1ρ relaxation times are consistent with a high risk of long-term patellofemoral osteoarthritis for adolescents who experience patellar dislocations. T1ρ relaxation times were elevated for multiple regions of patellofemoral cartilage. T1ρ relaxation times were expected to increase with additional dislocation episodes, but relaxation times after single and multiple dislocations were similar. After a first dislocation, parameters related to patellar maltracking were correlated with cartilage degradation.
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Affiliation(s)
| | | | - Mei Li
- Cleveland Clinic, Cleveland, OH, USA
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Danielsen O, Poulsen TA, Eysturoy NH, Mortensen ES, Hölmich P, Barfod KW. Trochlea dysplasia, increased TT-TG distance and patella alta are risk factors for developing first-time and recurrent patella dislocation: a systematic review. Knee Surg Sports Traumatol Arthrosc 2023; 31:3806-3846. [PMID: 36854995 DOI: 10.1007/s00167-022-07255-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Accepted: 11/23/2022] [Indexed: 03/02/2023]
Abstract
PURPOSE The aim of the study was to perform a systematic review and best knowledge synthesis of the present literature concerning biomechanical risk factors for developing first-time and recurrent patella dislocation. METHODS The study was performed as a systematic review following PRISMA guidelines. PubMed and EMBASE were systematically searched. Studies investigating participants with risk factors for first-time as well as recurrent patella dislocation were included. The records were screened, and data extracted independently by two researchers supervised by a third independent assessor. The study was registered in PROSPERO. RESULTS A total of 6233 records were screened, and 50 studies met the inclusion criteria. The biomechanical risk factors: trochlear dysplasia, increased tibial tuberosity-trochlear groove distance (TT-TG), and patella alta were found to be statistically significantly associated with patella dislocation in several publications and were thus recognized as risk factors for patella dislocation. The soft-tissue stabilizers: longer and thinner MPFL ligament, increased number of type 2C and decreased number of type 1 muscle fibers, and joint laxity were found to be statistically significantly associated with patella dislocation in a few publications, but due to limited evidence, no conclusion was made on this matter. CONCLUSION There is strong evidence in the literature that abnormalities of bony stabilizers, trochlear dysplasia, increased TT-TG distance, and patella alta are risk factors for patella dislocation. There is less evidence that soft-tissue stabilizers are risk factors. The study emphasizes the importance of a thorough investigation of bony stabilizers in clinical decision-making. LEVEL OF EVIDENCE Level IV.
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Affiliation(s)
- Oddrún Danielsen
- National Hospital of the Faroe Islands, J.C. Svabosgøta 41-49, 100, Tórshavn, Faroe Islands.
| | - Turið Akraberg Poulsen
- National Hospital of the Faroe Islands, J.C. Svabosgøta 41-49, 100, Tórshavn, Faroe Islands
| | | | | | - Per Hölmich
- Sports Orthopedic Research Center, Copenhagen, (SORC-C), Department of Orthopedic Surgery, Copenhagen University Hospital, Amager-Hvidovre, Kettegård Allé 30, 2650, Hvidovre, Denmark
| | - Kristoffer Weisskirchner Barfod
- Sports Orthopedic Research Center, Copenhagen, (SORC-C), Department of Orthopedic Surgery, Copenhagen University Hospital, Amager-Hvidovre, Kettegård Allé 30, 2650, Hvidovre, Denmark
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Danielsen O, Poulsen TA, Eysturoy NH, Mortensen ES, Hölmich P, Barfod KW. Familial association and epidemilogical factors as risk factors for developing first time and recurrent patella dislocation: a systematic review and best knowledge synthesis of present literature. Knee Surg Sports Traumatol Arthrosc 2023; 31:3701-3733. [PMID: 36629887 DOI: 10.1007/s00167-022-07265-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Accepted: 11/28/2022] [Indexed: 01/12/2023]
Abstract
PURPOSE The aim of our study was to perform a systematic review and best knowledge synthesis of the present literature concerning the familial association and epidemiological factors as risk factors for developing first-time and recurrent patella dislocation. METHODS The study was conducted according to the PRISMA guidelines and registered in PROSPERO. EMBASE and PubMed were systematically searched on the 5th of May 2022. Studies investigating participants with genetic and epidemiological risk factors for the first time as well as recurrent patella dislocation were included. The records were screened, and data were extracted independently by two researchers supervised by a third independent assessor. RESULTS A total of 6,649 records were screened, and 67 studies were included. Familial association was described as a risk factor for patella dislocation in 17 studies. One study found that participants with a family history of patella dislocation had a 3.7 higher risk for patella dislocation in the contralateral asymptomatic knee, and another study found a family history of PD in 9% of 74 participants. Eleven studies found an accumulation of patella dislocation across generations in specific families. Additionally, a range of genetic syndromes was associated with patella dislocation. Young age is a well-investigated risk factor for patella dislocation, but the results are inconsistent. Only five and eight studies investigated skeletal immaturity and gender as risk factors for patella dislocation, respectively. CONCLUSION There may be a familial association with patella dislocation, but further investigation is necessary to determine the strength and etiology of the association. There is weak evidence that epidemiological risk factors, such as age, skeletal immaturity, gender, and BMI are risk factors for patella dislocation. LEVEL OF EVIDENCE IV.
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Affiliation(s)
- Oddrún Danielsen
- National Hospital of the Faroe Islands, J.C. Svabosgøta 41-49, 100, Tórshavn, Faroe Islands.
| | - Turið Akraberg Poulsen
- National Hospital of the Faroe Islands, J.C. Svabosgøta 41-49, 100, Tórshavn, Faroe Islands
| | | | | | - Per Hölmich
- Sports Orthopedic Research Center-Copenhagen, (SORC-C), Department of Orthopedic Surgery, Copenhagen University Hospital, Amager-Hvidovre, Kettegård Allé 30, 2650, Hvidovre, Denmark
| | - Kristoffer Weisskirchner Barfod
- Sports Orthopedic Research Center-Copenhagen, (SORC-C), Department of Orthopedic Surgery, Copenhagen University Hospital, Amager-Hvidovre, Kettegård Allé 30, 2650, Hvidovre, Denmark
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Dai Y, Diao N, Lin W, Yang G, Kang H, Wang F. Patient-Reported Outcomes and Risk Factors for Decreased Improvement after Patellofemoral Arthroplasty. J Knee Surg 2023; 36:382-388. [PMID: 34583395 DOI: 10.1055/s-0041-1735159] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Patellofemoral arthroplasty (PFA) is acknowledged as the method for the treatment of isolated patellofemoral osteoarthritis (PFOA). Few previous studies have assessed the patient-reported outcomes (PROs) and risk factors of less improvement of PROs in patients undergoing PFA. A retrospective analysis was performed, including all patients who had undergone PFA. Pre- and postoperative PROs included the Oxford Knee Score (OKS) and Kujala score. Univariate and multivariate statistical analyses were performed to assess influencing factors of less improvement of PROs including the demographic factors (gender, age, body mass index, smoking, opioid usage, and duration of symptoms [DOSs]), surgical factors (concomitant surgery), and imaging factors (trochlear dysplasia [TD], patellar height, the degree of PFOA). A total of 46 PFAs were analyzed with a mean follow-up of 37 ± 7 months. The mean age at surgery was 61.1 ± 7.7 years. Patients showed significant improvement in all PROs (p < 0.001). Patients with TD preoperatively have greater improvement in OKS and Kujala score postoperatively (19.2 ± 5.0 vs. 23.1 ± 3.6, p = 0.038). Longer DOSs (≥1 year) had a greater mean improvement in OKS and Kujala score (p = 0.011 and p = 0.000). According to the measurement of patella height, patients with patella alta (Caton-Deschamps index [CDI] ≥1.3) showed less improvement in both OKS and Kujala score (p = 0.000 and p = 0.002). PFA is a safe and efficient surgery with good PROs. Patella alta with a CDI ≥1.3 and duration of preoperative symptoms ≤ 1 year were risk factors for decreased OKS and Kujala score improvement, while the preoperative presence of TD was significantly predictive factors for increased OKS improvement.
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Affiliation(s)
- Yike Dai
- Department of Orthopaedic Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Naicheng Diao
- Department of Orthopaedic Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Wei Lin
- Department of Orthopedic Surgery, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, People's Republic of China
| | - Guangmin Yang
- Department of Orthopedic Surgery, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, People's Republic of China
| | - Huijun Kang
- Department of Orthopedic Surgery, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, People's Republic of China
| | - Fei Wang
- Department of Orthopedic Surgery, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, People's Republic of China
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Jiang J, Yi Z, Li J, Liu Y, Xia Y, Wu M. Medial Patellofemoral Ligament Reconstruction is Preferred to Repair or Reefing for First-Time Patellar Dislocation: A Systematic Review and Meta-analysis. Indian J Orthop 2023; 57:177-188. [PMID: 36777132 PMCID: PMC9880132 DOI: 10.1007/s43465-022-00770-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 10/21/2022] [Indexed: 11/07/2022]
Abstract
Purpose The purpose of this systematic review aimed to investigate the clinical outcome of medial patellofemoral ligament (MPFL) reconstruction, MPFL repair and medial reefing for patients with first-time patellar dislocation. Methods Databases of PubMed, EMBASE, Cochrane Library and Web of Science were searched up to May 8, 2022. Only articles treating first-time patellar dislocation with MPFL reconstruction, MPFL repair and medial reefing were included in the analysis. Eligible identification, data extraction, quality assessment and statistical analysis were performed by two independent reviewers. The primary outcome measures were the incidences of postoperatively redislocation and reoperation. The second outcomes were the Kujala functional score and complications (including infection, osteoarthritis, and loss of range of motion). Results Twenty-two studies involving 668 patients met the inclusion criteria. Of which, four studies involving 126 patients were in MPFL reconstruction group, ten studies involving 220 patients in MPFL repair group and 9 studies involving 322 patients in medial reefing group. Our results showed that the MPFL reconstruction (1.8%, 95% CI - 0.5 to 4.0%) had a significantly lower rate of postoperative redislocation and reoperation rate than the MPFL repair (15.4%, 95% CI 5.2-25.7%) and medial reefing (18.0%, 95% CI 9.3-26.7%). Besides, no significant differences were found in the Kujala score and complication rate among the three treatments. Conclusion The available evidence demonstrated that MPFL reconstruction could achieve significantly lower redislocation rate and reoperation rate than MPFL repair and medial reefing after first-time patella dislocation. Furthermore, there was not enough evidence to reveal that MPFL reconstruction provided better functional outcome compared with MPFL repair and medial reefing. MPFL reconstruction is a preferred surgical treatment for patients with first-time patellar dislocation. Level of Evidence Level IV, systematic review of Level I-IV.
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Affiliation(s)
- Jin Jiang
- Department of Orthopaedics, Lanzhou University Second Hospital, No. 82 Cuiyingmen, Chengguan District, Lanzhou, 730030 Gansu China
| | - Zhi Yi
- Department of Orthopaedics, Lanzhou University Second Hospital, No. 82 Cuiyingmen, Chengguan District, Lanzhou, 730030 Gansu China
| | - Junmin Li
- Department of Pharmacy, Lanzhou University Second Hospital, No. 82 Cuiyingmen, Chengguan District, Lanzhou, 730030 Gansu China
| | - Yan Liu
- School of Pharmacy, Lanzhou University, No. 82 Cuiyingmen, Chengguan District, Lanzhou, 730030 Gansu China
| | - Yayi Xia
- Department of Orthopaedics, Lanzhou University Second Hospital, No. 82 Cuiyingmen, Chengguan District, Lanzhou, 730030 Gansu China
| | - Meng Wu
- Department of Orthopaedics, Lanzhou University Second Hospital, No. 82 Cuiyingmen, Chengguan District, Lanzhou, 730030 Gansu China
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10
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Soft-tissue fixation is not inferior to suture-anchor fixation in reconstruction of the medial patellofemoral ligament using a nonresorbable suture tape. Knee Surg Sports Traumatol Arthrosc 2023; 31:292-298. [PMID: 35994076 DOI: 10.1007/s00167-022-07120-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 08/10/2022] [Indexed: 01/25/2023]
Abstract
PURPOSE Reconstruction of the medial patellofemoral ligament (MPFL-R) with nonresorbable suture tape (FiberTape®, FT) is becoming popular. Patella-side fixation of the FT can be performed with suture anchors or via soft-tissue fixation. The aim of this study was to investigate whether patella-side soft-tissue fixation can achieve equivalent primary stability compared to suture-anchor fixation. METHODS In ten human, fresh-frozen knee joint specimens (m/f 6/4; age 74 ± 9 a), the MPFL was identified and dissected near the femoral insertion site. In five knee joints, the MPFL-R using FT was performed with soft-tissue fixation at the patella (study group; SG), and in five knee joints, the FT was fixed via suture anchors (control group, CG). All reconstructions were evaluated until load to failure of the patella-side fixation with a displacement rate of 200 mm/min. RESULTS The mean maximum load to failure in the SG was 395.3 ± 57.9 N. All reconstructions failed by complete tearing off the medial patellar retinaculum from its medial patellar margin, but fixation of the FT remained stable. In the CG, the mean maximum load to failure was 239.4 ± 54.5 N and was significantly different compared to the SG (p = 0.04). All reconstructions failed via pullout of the suture anchors. Stiffness and elongation did not differ between the groups, and no failure of the FT was observed in any of the specimens. CONCLUSION Primary stability of soft-tissue MPFL-R using FT was superior to suture-anchor fixation. Both fixation techniques provided sufficient primary stability, superior to previously reported native MPFL tensile strengths. MPFL-R with FT could be a possible alternative procedure for MPFL-R, eliminating potential complications due to autologous tendon graft harvesting.
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11
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Migliorini F, Baroncini A, Bell A, Weber C, Hildebrand F, Maffulli N. Surgical strategies for chondral defects of the patellofemoral joint: a systematic review. J Orthop Surg Res 2022; 17:524. [PMID: 36471319 PMCID: PMC9720953 DOI: 10.1186/s13018-022-03419-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 11/24/2022] [Indexed: 12/09/2022] Open
Abstract
BACKGROUND The management of chondral defects of the patellofemoral joint is debated, and definitive evidence is lacking. This study systematically updated and summarised the current literature on the surgical management of isolated chondral defects of the patellofemoral joint, discussing techniques, outcome, pitfalls, and new frontiers. METHODS This systematic review was conducted according to the 2020 PRISMA statement. In August 2022, PubMed, Web of Science, Google Scholar, and Embase databases were accessed with no time constrain. All the clinical studies investigating the surgical management of chondral defects of the patellofemoral joint were retrieved. Articles which reported data on patients with advanced to severe osteoarthritis were not eligible. Only studies with a minimum 24 months follow-up were considered. Studies which mixed results of patellofemoral and tibiofemoral joints were not considered. RESULTS Data from 10 studies (692 procedures) were retrieved. The mean follow-up was 46.9 ± 18.2 months. The mean age of the patients was 34.0 ± 6.1 years, and the mean BMI was 25.9 ± 0.8 kg/m2. The mean duration of symptoms before the index surgery was 81.0 ± 24.0 months. The mean defect size was 3.8 ± 0.8 cm2. All the PROMs improved from baseline to last follow-up: VAS 0-10 (P = 0.04), Tegner (P = 0.02), Lysholm (P = 0.03), and International Knee Documentation Committee (P = 0.03). The rate of hypertrophy was 5.6% (14 of 251), the rate of progression to total knee arthroplasty was 2.4% (2 of 83), the rate of revision was 16.9% (29 of 136), and the rate of failure was 13.0% (16 of 123). CONCLUSION Current surgical strategies may be effective to improve symptoms deriving from chondral defects of the patellofemoral joint. The limited and heterogeneous data included for analysis impact negatively the results of the present study. Further clinical studies are strongly required to define surgical indications and outcomes, and the most suitable technique.
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Affiliation(s)
- Filippo Migliorini
- grid.412301.50000 0000 8653 1507Department of Orthopaedic, Trauma, and Reconstructive Surgery, RWTH University Hospital, Pauwelsstraße 30, 52074 Aachen, Germany ,Department of Orthopaedic and Trauma Surgery, Eifelklinik St. Brigida, 52152 Simmerath, Germany
| | - Alice Baroncini
- grid.412301.50000 0000 8653 1507Department of Orthopaedic, Trauma, and Reconstructive Surgery, RWTH University Hospital, Pauwelsstraße 30, 52074 Aachen, Germany
| | - Andreas Bell
- Department of Orthopaedic and Trauma Surgery, Eifelklinik St. Brigida, 52152 Simmerath, Germany
| | - Christian Weber
- grid.412301.50000 0000 8653 1507Department of Orthopaedic, Trauma, and Reconstructive Surgery, RWTH University Hospital, Pauwelsstraße 30, 52074 Aachen, Germany
| | - Frank Hildebrand
- grid.412301.50000 0000 8653 1507Department of Orthopaedic, Trauma, and Reconstructive Surgery, RWTH University Hospital, Pauwelsstraße 30, 52074 Aachen, Germany
| | - Nicola Maffulli
- grid.11780.3f0000 0004 1937 0335Department of Medicine, Surgery and Dentistry, University of Salerno, 84081 Baronissi, SA Italy ,grid.9757.c0000 0004 0415 6205School of Pharmacy and Bioengineering, Keele University Faculty of Medicine, Stoke on Trent, ST4 7QB England ,grid.4868.20000 0001 2171 1133Barts and the London School of Medicine and Dentistry, Centre for Sports and Exercise Medicine, Queen Mary University of London, Mile End Hospital, London, E1 4DG England
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Reconstruction of the medial patellofemoral ligament with nonresorbable suture tape normalizes patellar maltracking independent of patella-side fixation technique. Knee Surg Sports Traumatol Arthrosc 2022:10.1007/s00167-022-07256-0. [PMID: 36454291 DOI: 10.1007/s00167-022-07256-0] [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: 07/29/2022] [Accepted: 11/23/2022] [Indexed: 12/04/2022]
Abstract
PURPOSE Patellar maltracking caused by a rupture of the medial patellofemoral ligament (MPFL) can be improved by MPFL reconstruction (MPFL-R) with a tendon graft. Nonresorbable suture tape (FiberTape®, FT) is possibly becoming an option to tendon grafts for MPFL-R. Patella-side fixation of FT can be performed with suture anchors or via soft-tissue fixation. The aim of this study was to investigate patellar tracking considering soft-tissue-based and anchor-based patella-side fixation techniques. METHODS In eight fresh-frozen human knee joint specimens (m/f 4/4; age 75 ± 10 years), the MPFL was identified, and a rupture was placed near the femoral insertion site. In the study group (SG; 4 knees), soft-tissue fixation of the FT was performed at the medial patellar retinaculum; in the control group (CG; 4 knees), FT was fixed at the patella via suture anchors. For native MPFL (nMPFL), ruptured ("injured") MPFL (iMPFL) and reconstructed MPFL (FT-MPFL-SG, respectively, FT-MPFL-CG) cone beam CT scans were performed in 15°, 30°, and 45° of knee joint flexion. Patellar tracking was assessed using the radiological parameters patellar tilt (PT), congruence angle (CA) and posterior patellar edge-trochlear groove ratio (PTR). RESULTS All recorded radiological parameters increased, respectively, decreased in the CG and SG from the nMPFL to the iMPFL state. After MPFL-R, all parameters normalized when compared to the intact state (nMPFL), regardless of patella-side fixation technique. All investigated parameters of patellotrochlear alignment were positively, respectively, negatively significantly (p < 0.05) correlated throughout all evaluated conditions (nMPFL, iMPFL, FT-MPFL-SG, FT-MPFL-CG). CONCLUSION MPFL-R with a nonresorbable suture tape can normalize patellar maltracking in fresh-frozen human knee joint specimens in earlier degrees of knee joint flexion independent of patella-side fixation technique. The investigated parameters of patellotrochlear alignment correlate with each other.
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MPFL repair after acute first-time patellar dislocation results in lower redislocation rates and less knee pain compared to rehabilitation: a systematic review and meta-analysis. Knee Surg Sports Traumatol Arthrosc 2022:10.1007/s00167-022-07222-w. [PMID: 36372845 DOI: 10.1007/s00167-022-07222-w] [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: 08/25/2022] [Accepted: 11/02/2022] [Indexed: 11/14/2022]
Abstract
PURPOSE This study aimed to explore the efficacy of medial patellofemoral ligament (MPFL) repair versus nonoperative rehabilitation treatment on the rate of patellar redislocation and functional outcomes in skeletally mature patients with traumatic, first-time patellar dislocations. MATERIALS AND METHODS MEDLINE, PubMed and EMBASE were searched from database inception to May 2022 for studies examining the management options for acute first-time patellar dislocations. This study was conducted in accordance with PRISMA and R-AMSTAR guidelines. Data on redislocation rates, functional outcomes including the Kujala score for anterior knee pain, and complication rates were extracted. A meta-analysis was used to pool the mean postoperative Kujala score and calculate the proportion of patients sustaining redislocations using a random effects model. Quality assessment of included studies was performed for all included studies using the MINORS and Detsky scores. RESULTS This review included a total of 25 studies and 1,361 patients. The pooled mean redislocation rate in 15 studies comprising 798 patients in the rehabilitation group was 30% (95% CI 25-36%, I2 = 65%). Moreover, the pooled mean redislocation rate in 10 studies comprising 170 patients undergoing MPFL repair was 7% (95% CI 3-12%, I2 = 30%). The pooled mean postoperative Kujala score in 8 studies comprising 396 patients in the rehabilitation group was 82.5 (95% CI 78.3-86.8, I2 = 91%), compared to a score of 88 (95% CI 87-90, I2 = 76%) in 3 studies comprising 94 patients in the repair group. Range of motion deficits was reported in 3.8% of 893 patients in the rehabilitation group and 2.0% of 205 patients in the repair group. CONCLUSION MPFL repair resulted in a lower rate of redislocation, less knee pain, and noninferiority with respect to a range of motion deficits compared to nonoperative treatment for the management of acute first-time patellar dislocations. LEVEL OF EVIDENCE IV.
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Cohen D, Le N, Zakharia A, Blackman B, de Sa D. MPFL reconstruction results in lower redislocation rates and higher functional outcomes than rehabilitation: a systematic review and meta-analysis. Knee Surg Sports Traumatol Arthrosc 2022; 30:3784-3795. [PMID: 35616703 DOI: 10.1007/s00167-022-07003-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 05/04/2022] [Indexed: 12/25/2022]
Abstract
PURPOSE To determine the effect of early MPFL reconstruction versus rehabilitation on the rate of recurrent patellar dislocations and functional outcomes in skeletally mature patients with traumatic, first-time patellar dislocation. METHODS Three online databases MEDLINE, PubMed and EMBASE were searched from database inception (1946, 1966, and 1974, respectively) to August 20th, 2021 for literature addressing the management of patients sustaining acute first-time patellar dislocations. Data on redislocation rates, functional outcomes using the Kujala score, and complication rates were recorded. A meta-analysis was used to pool the mean postoperative Kujala score, as well as calculate the proportion of patients sustaining redislocation episodes using a random effects model. Quality assessment of included studies was performed for all included studies using the MINORS and Detsky scores. RESULTS A total of 19 studies and 1,165 patients were included in this review. The pooled mean redislocation rate in 14 studies comprising 734 patients in the rehabilitation group was 30% (95% CI 25-36%, I2 = 67%). Moreover, the pooled mean redislocation rate in 5 studies comprising 318 patients undergoing early MPFL reconstruction was 7% (95% CI 2-17%, I2 = 70%). The pooled mean postoperative Kujala anterior knee pain score in 7 studies comprising 332 patients in the rehabilitation group was 81 (95% CI 78-85, I2 = 78%), compared to a score of 87 (95% CI 85-89, I2 = 0%, Fig. 4) in 3 studies comprising 54 patients in the reconstruction group. CONCLUSION Management of acute first-time patellar dislocations with MPFL reconstruction resulted in a lower rate of redislocation of 7% in the reconstruction group vs 30% in the rehabilitation group and a higher Kujala score compared to the rehabilitation group. The information this review provides will help surgeons guide their decision to choose early MPFL reconstruction versus rehabilitation when treating patients with first-time patellar dislocations and may guide future studies on the topic. LEVEL OF EVIDENCE IV.
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Affiliation(s)
- Dan Cohen
- Division of Orthopaedic Surgery, Department of Surgery, McMaster University Medical Centre, 1200 Main St West, Hamilton, ON, 4E14L8N 3Z5, Canada
| | - NhatChinh Le
- Department of Medicine, McMaster University, Hamilton, ON, Canada
| | | | - Benjamin Blackman
- Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada
| | - Darren de Sa
- Division of Orthopaedic Surgery, Department of Surgery, McMaster University Medical Centre, 1200 Main St West, Hamilton, ON, 4E14L8N 3Z5, Canada.
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Paul RW, Johnson EE, Hall A, Clements A, Bishop ME, Ciccotti MG, Cohen SB, Erickson BJ. Comparison of post-operative outcomes following anterior cruciate ligament reconstruction between patients with vs. without elevated tibial tubercle-trochlear groove (TT-TG) distance. Knee Surg Sports Traumatol Arthrosc 2022; 31:2446-2453. [PMID: 36224290 DOI: 10.1007/s00167-022-07191-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 09/30/2022] [Indexed: 02/14/2023]
Abstract
PURPOSE It is unclear if an elevated tibial tubercle-trochlear groove (TT-TG) distance is a risk factor for poor outcomes following ACLR. Therefore, the purpose of this study was to determine whether patients with an elevated TT-TG have an increased risk of retear following primary ACLR compared to controls with a normal TT-TG. METHODS All patients who underwent primary ACLR between July 2018 and June 2019 with an available preoperative magnetic resonance imaging (MRI) were eligible for inclusion. TT-TG distance was measured on preoperative MRI scans by two independent investigators. Clinical outcomes, return-to-sport rates, and Lysholm scores were compared between patients with a TT-TG < 12.5 mm (normal) and those with a TT-TG ≥ 12.5 mm (elevated). RESULTS Overall, 159 patients were included, 98 with normal TT-TG distance and 61 with elevated TT-TG distance. Patients with an elevated TT-TG distance had worse post-operative Lysholm scores than patients with a normal TT-TG distance (83.0 vs. 95.0, p = 0.010). In patients who received a bone-patellar tendon-bone (BTB) graft, an elevated TT-TG distance was associated with higher rates of subjective instability (13.0% vs. 3.0%, p = 0.041), reoperation (13.0% vs. 1.5%, p = 0.012), and post-operative complications (25.0% vs. 8.2%, p = 0.026), as well as lower ACL psychological readiness scores (324.1 vs. 446.7, p = 0.015). CONCLUSION Patients with an elevated pre-operative TT-TG distance have worse Lysholm scores than patients with normal TT-TG distance. Patients with an elevated pre-operative TT-TG distance who underwent ACLR with BTB grafts had significantly higher rates of subjective instability, reoperation, and post-operative complications. LEVEL OF EVIDENCE III.
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Affiliation(s)
- Ryan W Paul
- Rothman Orthopaedic Institute, Philadelphia, PA, US
| | | | - Anya Hall
- Rothman Orthopaedic Institute, Egg Harbor Township, NJ, US
| | - Ari Clements
- Sidney Kimmel Medical College, Philadelphia, PA, US
| | - Meghan E Bishop
- Rothman Orthopaedic Institute, 645 Madison Avenue 3rd and 4th floors, New York, NY, 10022, US
| | | | | | - Brandon J Erickson
- Rothman Orthopaedic Institute, 645 Madison Avenue 3rd and 4th floors, New York, NY, 10022, US.
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16
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Mustamsir E, Isnansyah Y, Phatama KY. Patellar height measurement in Indonesian normal adult population. Ann Med Surg (Lond) 2022; 82:104411. [PMID: 36268405 PMCID: PMC9577418 DOI: 10.1016/j.amsu.2022.104411] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 08/10/2022] [Accepted: 08/12/2022] [Indexed: 11/16/2022] Open
Abstract
Background Patellar height is the distance formed by the patella and the length of the patellar tendon. Patellar height measurement can predispose to various abnormalities in the knee joint. Patellar height can be measured using several sizes, such as the Insall-Salvati ratio (IS), Modified Insall-Salvati ratio (MIS), Caton-Deschamps index (CD), and the Blackburne-Peel (BP) index. In Indonesia, no data on the value of patellar height is available. This study aims to determine the patellar height value in Indonesians and compare if there are differences with the standard values commonly used by other countries. Matherials and methods This study is descriptive with 136 research subjects aged 20–40. Data were taken from December 2021 to February 2022. The results of patellar X-ray were measured using the Insall-Salvati, Modified Insall-Salvati, Caton-Deschamps, and Blackburne-Peel methods. Results In the measurement of patellar height, the longest measurement was found in the MIS measurement, while the shortest patellar height was measured using the BP method. The normal value of the IS method is 0.78–1.26, the MIS method is > 1.98, the CD method is 0.79–1.23, and the BP method is 0.70–1.10 for patellar height in Indonesia. This study also shows no significant difference in the value of patellar height between male and female sex using the IS measurement method. Conclusion There is a difference in the standard value of patellar height, which is commonly used by other countries with the standard value of patellar height in Indonesia, but it is not significant. Each country has different standard value of the patella height. Patellar height can be measured using several methods. Indonesian patellar height standard value different with other countries.
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Affiliation(s)
- Edi Mustamsir
- Corresponding author. Jl. Jaksa Agung Suprapto No.2, Klojen, Malang, 65111, East Java, Indonesia.
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Orellana KJ, Batley MG, Lawrence JTR, Nguyen JC, Williams BA. Radiographic Evaluation of Pediatric Patients with Patellofemoral Instability. Curr Rev Musculoskelet Med 2022; 15:411-426. [PMID: 35932425 DOI: 10.1007/s12178-022-09780-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/21/2022] [Indexed: 11/25/2022]
Abstract
PURPOSE OF REVIEW The purpose of this review is to highlight the radiographic assessments of utility in the evaluation of a pediatric patient with patellofemoral instability to facilitate a thorough work-up. Understanding of these measures is useful in understanding evolving research in this field, providing accurate patient risk assessment, and appropriately directing surgical decision-making. RECENT FINDINGS Recent literature has broadened the radiographic characterization of the pediatric patellar instability and its anatomic risk factors. Knee MRI can inform the assessment of skeletal maturity and novel axial alignment measurements may enhance our identification of patients at increased risk of recurrent instability. Additional improvements have been made in the objective measurement and classification of trochlear dysplasia. Knee MRI-based skeletal age assessments may obviate the need for hand bone age assessments in growing children with patellofemoral instability. Novel objective measures exist in the evaluation of pediatric patellar instability both in the assessment of axial alignment and trochlear dysplasia. Future work should focus on how these measures can aid in guiding surgical decision-making.
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Affiliation(s)
- Kevin J Orellana
- University of Texas Rio Grande Valley School of Medicine, Edinburg, TX, USA
| | - Morgan G Batley
- Department of Orthopaedics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - J Todd R Lawrence
- Department of Orthopaedics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
- Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Jie C Nguyen
- Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
- Department of Radiology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Brendan A Williams
- Department of Orthopaedics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
- Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA.
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Corey RM, Rabe J, Yalcin S, Saluan P, Farrow LD. Factors Associated With Pain and Function Before Medial Patellofemoral Ligament Reconstruction. Orthop J Sports Med 2022; 10:23259671221116150. [PMID: 36051978 PMCID: PMC9425910 DOI: 10.1177/23259671221116150] [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: 03/26/2022] [Accepted: 05/17/2022] [Indexed: 11/24/2022] Open
Abstract
Background: Medial patellofemoral ligament (MPFL) reconstruction is performed to treat recurrent patellar instability. Measurement of joint pain and function at the time of surgery has been demonstrated to be a predictor of the final outcomes in many surgical procedures. Purpose/Hypothesis: The purpose of this study was to evaluate the relationship between baseline patient characteristics, mental health, and intraoperative findings and patient-reported knee pain and function at the time of MPFL reconstruction. We hypothesized that patient characteristics and associated pathology would be associated with the degree of pain and dysfunction. Study Design: Cross-sectional study; Level of evidence, 3. Methods: Included were skeletally mature patients who underwent unilateral open MPFL reconstruction between 2015 and 2020 at a single institution. Baseline descriptive information was collected, and the following outcome measures were administered preoperatively: the Veterans RAND 12-Item Health Survey Mental Component Score (VR-12 MCS) and the Knee injury and Osteoarthritis Outcome Score (KOOS) Pain, Physical Function Short Form (PS), and Quality of Life (QoL) subscales. Intraoperative findings were collected in a standardized format. Patient characteristics, preoperative variables, intraoperative findings, and VR-12 MCS were used as risk factors, and multivariate analysis was conducted to assess for relationships with the KOOS subscale scores. Results: In total, 201 patients with patella dislocations were included in this analysis. Intraoperatively, 122 patients (60.7%) had either normal cartilage or grade 1 or 2 cartilage injury, 79 patients (39.3%) had grade 3 or 4 cartilage injury, 35 patients (17.4%) had a loose body, and 3 patients (1.49%) had evidence of synovitis. Younger age (P = .012), male sex (P < .001), never having smoked (P = .029), and lower baseline VR-MCS (P < .001) were significantly associated with higher baseline KOOS Pain scores. Older age (P = .035), female sex (P = .003), higher body mass index (P = .005), and lower baseline VR-12 MCS (P < .001) were significantly associated with higher baseline KOOS PS scores. Younger age (P = .003), male sex (P < .001), lower baseline VR-12 MCS (P < .001), and no dysplasia (P = .023) were significantly associated with higher baseline KOOS QoL scores. Conclusion: Patient age, sex, and baseline VR-12 MCS were associated with all 3 baseline KOOS subscale scores, whereas intraoperative findings outside of trochlear dysplasia were not associated with any of the KOOS subscale scores.
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Affiliation(s)
- Robert M Corey
- Department of Orthopaedic Surgery, Guthrie Clinic, Geisinger Commonwealth School of Medicine, Scranton, Pennsylvania, USA
| | - Joseph Rabe
- Department of Orthopaedic Surgery, Summa Health, Akron, Ohio, USA
| | - Sercan Yalcin
- Department of Orthopaedics & Rehabilitation, Yale School of Medicine, New Haven, Connecticut, USA
| | - Paul Saluan
- Cleveland Clinic Orthopaedic and Rheumatologic Institute, Cleveland, Ohio, USA
| | - Lutul D Farrow
- Cleveland Clinic Orthopaedic and Rheumatologic Institute, Cleveland, Ohio, USA
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Zheng L, Si XL, Zhang M, Zhang GY. Factors associated with acute articular cartilage lesions of the patella and lateral femoral condyle in acute first-time lateral patellar dislocation: A prospective magnetic resonance imaging study. Injury 2022; 53:2644-2649. [PMID: 35613966 DOI: 10.1016/j.injury.2022.05.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 05/09/2022] [Accepted: 05/13/2022] [Indexed: 02/02/2023]
Abstract
OBJECTIVES To identify risk factors of acute articular cartilage lesions of the patella and lateral femoral condyle in acute first-time lateral patellar dislocation (LPD). METHODS Magnetic resonance images were prospectively analyzed in 115 patients in an acute first-time LPD. Factors included gender, skeletal maturity, trochlear dysplasia, patellar height, and tibial tuberosity-trochlear groove (TT-TG) distance. Binary logistic regression analysis was carried out to identify the independent risk factors for the incidence of acute articular cartilage lesions of the patella and lateral femoral condyle in acute first-time LPD. RESULTS The incidence of acute articular cartilage lesion of the patella and lateral femoral condyle were 46.1% and 27% in acute first-time LPD, respectively. Univariate analysis revealed significantly higher incidence rate of acute articular cartilage lesion of the patella in male (P = 0.027), skeletally mature (P = 0.035), normal TT-TG distance (P = 0.043) and normal femoral trochlea (P = 0.031). Risk factors for the incidence of acute articular cartilage lesion of the patella were skeletally mature (odds ratio (OR): 2.324), normal TT-TG distance (OR: 2.824) and normal femoral trochlea (OR: 3.835). Univariate analysis revealed significantly higher incidence rate of acute articular cartilage lesion of the lateral femoral condyle in skeletally mature (P = 0.027) and normal femoral trochlea (P = 0.031). Risk factor for the incidence of acute articular cartilage lesion of the lateral femoral condyle was normal femoral trochlea (OR: 3.347). CONCLUSIONS For patients in acute first-time LPD, compared with other parameters, the normal femoral trochlea, normal TT-TG distance and skeletally mature are independent risk factors for the incidence of acute articular cartilage lesion of the patella, and the normal femoral trochlea is an independent risk factor for the incidence of acute articular cartilage lesion of the lateral femoral condyle.
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Affiliation(s)
- Lei Zheng
- Department of Radiology, Shandong Provincial Corps Hospital of Chinese People's Armed Police Forces, Jinan 250014, China
| | - Xiao-Lin Si
- Shandong First Medical University, Jinan 250014, China; Department of Ultrasonography, Shandong Provincial Qianfoshan Hospital, The First Hospital Affiliated With Shandong First Medical University, Jinan 250014, China
| | - Meng Zhang
- Shandong First Medical University, Jinan 250014, China; Department of Ultrasonography, Shandong Provincial Qianfoshan Hospital, The First Hospital Affiliated With Shandong First Medical University, Jinan 250014, China
| | - Guang-Ying Zhang
- Department of Ultrasonography, Shandong Provincial Qianfoshan Hospital, The First Hospital Affiliated With Shandong First Medical University, Jinan 250014, China.
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Wierer G, Krabb N, Kaiser P, Ortmaier R, Schützenberger S, Schlumberger M, Hiller B, Ingruber F, Smekal V, Attal R, Seitlinger G. The Patellar Instability Probability Calculator: A Multivariate-Based Model to Predict the Individual Risk of Recurrent Lateral Patellar Dislocation. Am J Sports Med 2022; 50:471-477. [PMID: 35060768 DOI: 10.1177/03635465211063176] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Predicting the risk of recurrence is of great interest when counseling patients after primary lateral patellar dislocation (LPD). PURPOSE To investigate a multivariate model to predict the individual risk of recurrent LPD. STUDY DESIGN Case-control study; Level of evidence, 3. METHODS The study population included patients with primary LPD, knee imaging, and a minimum 2-year follow-up after nonoperative treatment. Data including patient characteristics and anatomic patellar instability risk factors were collected retrospectively from 7 national study centers. Bivariate and multivariate regression analyses were carried out to identify risk factors for recurrent LPD and to generate an accuracy-optimized model for out-of-sample prediction. RESULTS In total, 115 of 201 patients (57%) experienced recurrent LPD within 2 years after primary LPD. Age ≤16 years at primary LPD (odds ratio [OR], 5.0), history of contralateral instability (OR, 2.4), and trochlear dysplasia (Dejour type B-D: OR, 2.5; lateral trochlear inclination ≤12°: OR, 2.7) were significant risk factors for recurrent LPD (P < .05). The prediction accuracy including these 3 risk factors was 79%. Patella alta, an increased tibial tubercle to trochlear groove distance, and patellar tilt had neither an association with increased recurrence rates nor an influence on prediction accuracy of recurrent LPD. CONCLUSION Young age and trochlear dysplasia are major risk factors for early recurrent LPD. A multivariate model including age at primary LPD, lateral trochlear inclination, and history of contralateral LPD achieved the highest prediction accuracy. Based on these findings, the patellar instability probability calculator is proposed to estimate the individual risk of early recurrence when counseling patients after primary LPD.
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Affiliation(s)
- Guido Wierer
- Department of Orthopedics and Traumatology, Paracelsus Medical University Salzburg, Austria.,Research Unit for Orthopaedic Sports Medicine and Injury Prevention, Private University for Health Sciences, Medical Informatics and Technology, Hall in Tirol, Austria
| | - Nicole Krabb
- Department of Orthopedics and Traumatology, Paracelsus Medical University Salzburg, Austria
| | - Peter Kaiser
- Department of Orthopaedics and Traumatology, Medical University of Innsbruck, Austria
| | - Reinhold Ortmaier
- Department of Orthopaedic Surgery, Ordensklinikum Barmherzige Schwestern Linz, Teaching Hospital of the Paracelsus Medical University Salzburg, Linz, Austria
| | | | - Michael Schlumberger
- Department of Orthopaedics and Traumatology, Medical University of Innsbruck, Austria.,Center for Sports Orthopedics and Special Joint Surgery, Orthopedic Hospital Markgroeningen, Germany
| | - Bernd Hiller
- AUVA Trauma Center Salzburg, Academic Teaching Hospital of the Paracelsus Medical University, Salzburg, Austria
| | - Florian Ingruber
- AUVA Trauma Hospital Lorenz Boehler-European Hand Trauma Center, Vienna, Austria
| | | | - Rene Attal
- Department of Trauma Surgery and Sports Traumatology, Academic Hospital Feldkirch, LKH Feldkirch, Austria
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Allahabadi S, Pandya NK. Allograft Medial Patellofemoral Ligament Reconstruction in Adolescent Patients Results in a Low Recurrence Rate of Patellar Dislocation or Subluxation at Midterm Follow-Up. Arthroscopy 2022; 38:128-138. [PMID: 34000323 DOI: 10.1016/j.arthro.2021.05.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/14/2021] [Accepted: 05/06/2021] [Indexed: 02/02/2023]
Abstract
PURPOSE To evaluate rates of recurrent instability in adolescent patients with medial patellofemoral ligament (MPFL) reconstruction with allograft and associations of anatomic risk factors with complications. METHODS A retrospective review identified patients of a single surgeon who underwent MPFL reconstruction with allograft for recurrent patellar instability with minimum 2-year follow-up. Surgical management was recommended after a minimum 6 weeks of nonoperative management and included MPFL reconstruction with gracilis allograft using a double-bundle technique. Preoperative radiographs were evaluated to assess physeal closure, lower-extremity alignment, trochlear morphology, and Insall-Salvati and Caton-Deschamps ratios. Magnetic resonance images were reviewed to evaluate the MPFL, trochlear morphology, and tibial tubercle trochlear groove distance (TT-TG). Descriptive statistics were used to characterize data. The primary outcome was recurrent instability. RESULTS 20 patients (24 knees; 18 knees in 14 females and 6 knees in 6 males; average age 15.7 years; range 11.5 to 19.6) underwent MPFL reconstruction with allograft (mean ± standard deviation follow-up 5.2 ± 1.7 years; range 2.2 to 8.1). Physes were open in 9 knees. The Insall-Salvati ratio was 1.09 ± 0.16, and the Caton-Deschamps index was 1.17 ± 0.15. Preoperatively, 19 patients were noted to have trochlear dysplasia, and TT-TG was 15.3 ± 3.9 mm. Three of 4 knees (16.7%) with non-hardware-related complications had open physes: 3 (12.5%) had recurrent instability, 2 of which underwent subsequent operation, and 1 sustained a patella fracture after a fall, requiring open reduction and internal fixation. The average Insall-Salvati ratio of these 4 patients was 1.21 ± 0.20, Caton-Deschamps index was 1.18 ± 0.17, and TT-TG was 17.5 ± 3.3 mm, none of which were statistically different from the group without complications. There were no clinically noted growth disturbances postoperatively. CONCLUSIONS MPFL reconstruction using allograft tissue may be performed safely in the pediatric and adolescent population with good outcomes at midterm follow-up, few complications, and a low rate of recurrent instability. LEVEL OF EVIDENCE IV, case series.
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Affiliation(s)
- Sachin Allahabadi
- Department of Orthopaedic Surgery, University of California, San Francisco, San Francisco, California, U.S.A
| | - Nirav K Pandya
- Department of Orthopaedic Surgery, Benioff Children's Hospital Oakland, University of California, San Francisco, San Francisco, California, U.S.A..
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22
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Ahrend MD, Eisenmann T, Herbst M, Gueorguiev B, Keller G, Schmidutz F, Döbele S, Schröter S, Ihle C. Increased tibial tubercle-trochlear groove and patellar height indicate a higher risk of recurrent patellar dislocation following medial reefing. Knee Surg Sports Traumatol Arthrosc 2022; 30:1404-1413. [PMID: 34032867 PMCID: PMC9007812 DOI: 10.1007/s00167-021-06581-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 04/13/2021] [Indexed: 12/15/2022]
Abstract
PURPOSE Identifying anatomical risk factors on recurrent dislocation after medial reefing is important for deciding surgical treatment. The present study aimed to retrospectively analyze the preoperative magnetic resonance imaging (MRI)-based parameters of patients treated with medial reefing and whether these parameters lead to a higher risk of recurrent dislocation. METHODS Fifty-five patients (18.6 ± 6.6 years) who underwent medial reefing after primary traumatic patellar dislocation (84% with medial patellofemoral ligament [MPFL] rupture) were included. Patients were followed up for at least 24 months postoperatively (3.8 ± 1.2 years) to assess the incidence of recurrent patellar dislocation. In patients without recurrent dislocation, the Kujala and subjective IKDC scores were assessed. Moreover, the tibial tubercle-trochlear groove (TT-TG), sulcus angle, patellar tilt, patellar shift, and lateral trochlea index (LTI) were measured. The patellar height was measured using the Caton-Dechamps (CDI), Blackburne-Peel (BPI), and Insall-Salvati index (ISI). The cohort was subclassified into two groups with and without recurrent dislocation. Differences between groups were analyzed with respect to the MRI parameters. RESULTS Forty percent had a pathological sulcus angle of > 145°, 7.2% had an LTI of < 11°, 47.3% had a patellar tilt of > 20°, and 36.4% had a TT-TG of ≥ 16 mm. Increased patellar height was observed in 34.5, 65.5, and 34.5% of the patients as per CDI, BPI, and ISI, respectively. Nineteen (34.5%) patients suffered from recurrent dislocation. Compared with patients without recurrent dislocation, those with recurrent dislocation had a significantly lower LTI (p = 0.0467). All other parameters were not significantly different between the groups. Risk factor analysis showed higher odds ratios (OR > 2), although not statistically significant, for MPFL rupture (OR 2.05 [95% confidence interval 0.38-11.03], LTI (6.6 [0.6-68.1]), TT-TG (2.9 [0.9-9.2]), and patellar height according to ISI (2.3 [0.7-7.5]) and CDI (2.3 [0.7-7.5])). Patients without recurrent dislocation had a Kujala score of 93.7 ± 12.1 (42-100) points and an IKDC score of 90.6 ± 11.7 (55.2-100) points. CONCLUSION Anatomical, MRI-based parameters should be considered before indicating medial reefing. A ruptured MPFL, an LTI < 11°, a TT-TG ≥ 16 mm, a patellar tilt > 20 mm, and an increased patellar height according to ISI and CDI were found to be associated, although not significantly, with a higher risk (OR > 2) of recurrent patellar dislocation after medial reefing. Thorough preoperative analysis is crucial to reduce the risk of recurrent dislocation in young patient cohorts. LEVEL OF EVIDENCE Level IV.
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Affiliation(s)
- Marc-Daniel Ahrend
- grid.10392.390000 0001 2190 1447Department of Traumatology and Reconstructive Surgery, BG Trauma Center Tübingen, Eberhard Karls University Tübingen, Tübingen, Germany ,grid.418048.10000 0004 0618 0495AO Research Institute Davos, Davos, Switzerland
| | - Tobias Eisenmann
- grid.10392.390000 0001 2190 1447Department of Traumatology and Reconstructive Surgery, BG Trauma Center Tübingen, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Moritz Herbst
- Department of Traumatology and Reconstructive Surgery, BG Trauma Center Tübingen, Eberhard Karls University Tübingen, Tübingen, Germany.
| | - Boyko Gueorguiev
- grid.418048.10000 0004 0618 0495AO Research Institute Davos, Davos, Switzerland
| | - Gabriel Keller
- grid.411544.10000 0001 0196 8249Department of Diagnostic and Interventional Radiology, University Hospital Tuebingen, Tübingen, Germany
| | - Florian Schmidutz
- grid.10392.390000 0001 2190 1447Department of Traumatology and Reconstructive Surgery, BG Trauma Center Tübingen, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Stefan Döbele
- grid.10392.390000 0001 2190 1447Department of Traumatology and Reconstructive Surgery, BG Trauma Center Tübingen, Eberhard Karls University Tübingen, Tübingen, Germany
| | - Steffen Schröter
- grid.491771.dDepartment of Traumatology and Reconstructive Surgery, Diakonie Klinikum GmbH Jung-Stilling-Krankenhaus, Siegen, Germany
| | - Christoph Ihle
- grid.10392.390000 0001 2190 1447Department of Traumatology and Reconstructive Surgery, BG Trauma Center Tübingen, Eberhard Karls University Tübingen, Tübingen, Germany
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Migliorini F, Marsilio E, Cuozzo F, Oliva F, Eschweiler J, Hildebrand F, Maffulli N. Chondral and Soft Tissue Injuries Associated to Acute Patellar Dislocation: A Systematic Review. Life (Basel) 2021; 11:life11121360. [PMID: 34947891 PMCID: PMC8706453 DOI: 10.3390/life11121360] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 11/24/2021] [Accepted: 12/02/2021] [Indexed: 01/03/2023] Open
Abstract
INTRODUCTION Chondral and soft tissue injuries can be associated with first time patellar dislocation, but it is unclear how common they are, and which tissues are affected. A systematic review of the literature was performed to investigate the frequency, location, and extent of chondral and medial patellofemoral ligament (MPFL) injuries in patients following first time patellar dislocation. METHODS This systematic review was conducted according to the PRISMA guidelines. PubMed, Google Scholar, Embase, and Web of Science databases were accessed in November 2021. All the published clinical studies reporting the frequency, location, and extent of soft tissue lesions following first time patellar dislocation were accessed. Studies reporting data on habitual, congenital, or recurrent patellofemoral instability were excluded. RESULTS Data from 42 articles (2254 patients, mean age 21.6 ± 7.3 years) were retrieved. Ninety-eight percent of patients who experienced first time patellar dislocation demonstrated MPFL rupture at MRI. Forty-eight percent of MPFL ruptures were located at the patellar side, 34% at the femoral insertion site, and 18% in the midportion. Eighty-five percent of patients showed signs of patellar chondral damage at MRI, and trochlear chondral injuries were evidenced in 47% of patients. Intra-articular loose bodies were observed in 11.5% of patients. At arthroscopy, the medial facet and the crest of the patella more commonly exhibited chondral lesions than the lateral facet and femoral trochlea. CONCLUSIONS Most patients suffer chondral damage and MPFL tears following after a first time patellar dislocation.
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Affiliation(s)
- Filippo Migliorini
- Department of Orthopedic, Trauma, and Reconstructive Surgery, RWTH Aachen University Hospital, 52064 Aachen, Germany; (J.E.); (F.H.)
- Correspondence: ; Tel.: +49-0241-80-35529
| | - Emanuela Marsilio
- Department of Orthopaedics, Surgery and Dentistry, University of Salerno, Via S. Allende, 84081 Baronissi, Italy; (E.M.); (F.C.); (F.O.); (N.M.)
| | - Francesco Cuozzo
- Department of Orthopaedics, Surgery and Dentistry, University of Salerno, Via S. Allende, 84081 Baronissi, Italy; (E.M.); (F.C.); (F.O.); (N.M.)
| | - Francesco Oliva
- Department of Orthopaedics, Surgery and Dentistry, University of Salerno, Via S. Allende, 84081 Baronissi, Italy; (E.M.); (F.C.); (F.O.); (N.M.)
| | - Jörg Eschweiler
- Department of Orthopedic, Trauma, and Reconstructive Surgery, RWTH Aachen University Hospital, 52064 Aachen, Germany; (J.E.); (F.H.)
| | - Frank Hildebrand
- Department of Orthopedic, Trauma, and Reconstructive Surgery, RWTH Aachen University Hospital, 52064 Aachen, Germany; (J.E.); (F.H.)
| | - Nicola Maffulli
- Department of Orthopaedics, Surgery and Dentistry, University of Salerno, Via S. Allende, 84081 Baronissi, Italy; (E.M.); (F.C.); (F.O.); (N.M.)
- Centre for Sports and Exercise Medicine, Barts and the London School of Medicine and Dentistry, Mile End Hospital, Queen Mary University of London, 275 Bancroft Road, London E1 4DG, UK
- School of Pharmacy and Bioengineering, Keele University Faculty of Medicine, Thornburrow Drive, Stoke on Trent ST5 5BG, UK
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Raoulis V, Fyllos A, Klontzas ME, Chytas D, Mitrousias V, Banios K, Maris TG, Karantanas AH, Zibis A. Surgical and Radiological Anatomy of the Medial Patellofemoral Ligament: A Magnetic Resonance Imaging and Cadaveric Study. Diagnostics (Basel) 2021; 11:diagnostics11112076. [PMID: 34829423 PMCID: PMC8625885 DOI: 10.3390/diagnostics11112076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 11/06/2021] [Accepted: 11/08/2021] [Indexed: 11/24/2022] Open
Abstract
The purpose of this study was to compare the measurement of several anatomical features of the medial patellofemoral ligament (MPFL) between magnetic resonance imaging (MRI) and by direct fashion during dissection. We hypothesized that the measurements between these two techniques would agree. MRI of 30 fresh-frozen cadaveric knees was followed by dissection. MPFL patella and femoral attachment were evaluated; their shape, length, and width were measured; and measurements were compared. MRI was deemed unreliable for the determination of several of the aforementioned anatomical features. Important findings include: (a) observations on MPFL attachment at medial patella side and attachment to quadriceps were identical between dissection and MRI; (b) average width at patella insertion was significantly different between the two methods (p = 0.002); and (c) an attachment to the quadriceps tendon was present in 20/30 specimens and d. detailed measurements of a thin, non-linear, and three-dimensional structure, such as the MPFL, cannot be performed on MRI, due to technical difficulties. This anatomical radiological study highlights the shape, anatomical measurements (length and width), and attachment of the MPFL using a relatively large cadaveric sample and suggests that MRI is not reliable for detailed imaging of its three-dimensional anatomy.
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Affiliation(s)
- Vasileios Raoulis
- Laboratory of Anatomy, Department of Medicine, School of Health Sciences, University of Thessaly, 3 University Str., Biopolis, 41110 Larissa, Greece; (V.R.); (A.F.)
| | - Apostolos Fyllos
- Laboratory of Anatomy, Department of Medicine, School of Health Sciences, University of Thessaly, 3 University Str., Biopolis, 41110 Larissa, Greece; (V.R.); (A.F.)
| | - Michail E. Klontzas
- Department of Radiology, Medical School, University of Crete, 71500 Heraklion, Greece; (M.E.K.); (A.H.K.)
- Department of Medical Imaging, University Hospital of Heraklion, 71110 Heraklion, Greece
| | - Dimitrios Chytas
- Department of Physiotherapy, University of Peloponnese, 20 Plateon Str., 23100 Sparta, Greece;
| | - Vasileios Mitrousias
- Department of Orthopedic Surgery, University Hospital of Larissa, 3 University Str., Biopolis, 41110 Larissa, Greece;
| | - Konstantinos Banios
- Department of Orthopedic Surgery, General Hospital of Karditsa, Peripheral Road Karditsa-Kastania, 43100 Karditsa, Greece;
| | - Thomas G. Maris
- Department of Medical Physics, School of Medicine, University of Crete, 71500 Heraklion, Greece;
| | - Apostolos H. Karantanas
- Department of Radiology, Medical School, University of Crete, 71500 Heraklion, Greece; (M.E.K.); (A.H.K.)
- Department of Medical Imaging, University Hospital of Heraklion, 71110 Heraklion, Greece
| | - Aristeidis Zibis
- Laboratory of Anatomy, Department of Medicine, School of Health Sciences, University of Thessaly, 3 University Str., Biopolis, 41110 Larissa, Greece; (V.R.); (A.F.)
- Correspondence:
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25
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Assessment of knee flexor muscles strength in patients with patellar instability and its clinical implications for the non-surgical treatment of patients after first patellar dislocation - pilot study. BMC Musculoskelet Disord 2021; 22:740. [PMID: 34454460 PMCID: PMC8403423 DOI: 10.1186/s12891-021-04636-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Accepted: 08/17/2021] [Indexed: 11/10/2022] Open
Abstract
Background Biomechanical studies indicate that during outward rotation of the tibia and the valgus knee joint position, the patella is shifted in the lateral direction. After first-time patellar dislocation, the dynamic position of the femur in relation to the tibia plays an important role in joint stability, because the medial stabilizer of the patella (mostly the MPFL) is damaged or inefficient. The most important factor in controlling the rotational movement of the tibia in relation to the thigh are the hamstring muscles. The aim of the study therefore is to determine whether patients with patellar instability have a significant weakness in the knee flexor muscles, which can predispose to recurrent dislocations. This is an important consideration when planning the rehabilitation of patients with first-time patellar dislocation. Methods The study enrolled 33 patients with confirmed recurrent patellar dislocation, including six patients with bilateral involvement. In the study group, the hamstring muscles (both sides) were evaluated at velocities of 60 and 180 deg/s for the following parameters: peak torque, torque at 30 degrees of knee flexion, angle of peak torque and peak torque hamstring to quadriceps ratio (H/Q ratio). Results In the recurrent patellar dislocation group, a statistically significant weakness in knee flexors was observed for both angular velocities compared to age and gender normative data. No such relationship was observed in the control group of heathy subjects. In patients with one-sided dislocation, no differences were found in knee flexors peak torque, torque at 30 degrees of knee flexion, angle of peak torque or H/Q ratio between the healthy and affected limbs for either angular velocity. Conclusions In patients with recurrent patellar dislocation, knee flexors strength is decreased significantly in both the unaffected and affected limbs. This may indicate a constitutional weakening of these muscles which can predispose to recurrent dislocations. Trial registration The study was retrospectively registered on ClinicalTrials.gov (NCT04838158), date of registration; 22/03/2021.
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Conry KT, Cosgarea AJ, Tanaka MJ, Elias JJ. Influence of tibial tuberosity position and trochlear depth on patellar tracking in patellar instability: Variations with Patella Alta. Clin Biomech (Bristol, Avon) 2021; 87:105406. [PMID: 34116451 DOI: 10.1016/j.clinbiomech.2021.105406] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 05/18/2021] [Accepted: 06/01/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND Patella alta reduces articular constraints acting on the patella from the trochlear groove with the knee extended. The current study was performed to address how patella alta alters the influence of tibial tuberosity position and trochlear depth on patellar tracking in patients being treated for patellar instability. METHODS Fifteen subjects with recurrent patellar instability participated in knee extension within a dynamic CT scanner. Computational models were reconstructed from the motions to characterize patellar lateral shift, patellar tilt, patellar height, trochlear depth and lateral position of the tibial tuberosity at 0° and 30° of knee flexion. Linear regressions were used to correlate patellar tracking with anatomy for an alta group (7 knees, Caton-Deschamps index > 1.2) and a non-alta group. FINDINGS For the alta group, lateral patellar shift and tilt increased with increasing lateral position of the tibial tuberosity at 0° (r2 > 0.8, P < 0.005). For the non-alta group, lateral patellar shift and tilt increased as depth of the groove decreased at 0° (r2 > 0.8, P = 0.001). Lateral patellar tilt also increased with increasing lateral position of the tibial tuberosity at 30° for the non-alta group (r2 = 0.55, P = 0.04). INTERPRETATION For patients with patellar instability, lateral patellar maltracking with the knee extended can be largely attributed to either a shallow trochlear groove or a combination of patella alta and a lateral position of the tibial tuberosity. These relationships should be considered in both conservative and surgical treatment planning.
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Affiliation(s)
- Keegan T Conry
- Department of Orthopedic Surgery, Cleveland Clinic Akron General, 1 Akron General Ave, Akron, OH 44307, United States.
| | - Andrew J Cosgarea
- Department of Orthopaedic Surgery, Johns Hopkins University, 10803 Falls Road, Suite 2100, Lutherville, MD 21093, United States.
| | - Miho J Tanaka
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, 175 Cambridge St. Suite 400, Boston, MA 02114, United States.
| | - John J Elias
- Department of Research, Cleveland Clinic Akron General, 1 Akron General Ave, Akron, OH 44307, United States.
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Zheng L, Ding HY, Feng Y, Sun BS, Zhu LL, Zhang GY. Gender-related differences in concomitant articular injuries after acute lateral patellar dislocation. Injury 2021; 52:1549-1555. [PMID: 33097203 DOI: 10.1016/j.injury.2020.10.065] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 10/13/2020] [Accepted: 10/15/2020] [Indexed: 02/02/2023]
Abstract
OBJECTIVES To explore the gender differences in the concomitant articular injuries after acute lateral patellar dislocation (LPD). METHODS Magnetic resonance images were prospectively analyzed in 166 patients after an acute LPD. Concomitant articular injuries included bone contusion, medial patellofemoral ligament (MPFL) injury, articular cartilage lesion, and vastus medialis obliquus (VMO) lesion. Statistical analyses were performed between the patient's gender and the incidence of concomitant articular injuries in adolescent and adult subgroups. RESULTS The incidence of partial and complete MPFL tear in adolescent males and females were (45%, 50%) and (63.2%, 29.8%), respectively. Compared with adolescent females, adolescent males showed higher incidence of complete MPFL tear (P = 0.049). The incidence of articular cartilage lesion of patella in adolescent males and females were 40% and 21.1%, respectively. Compared with adolescent females, adolescent males showed higher incidence of articular cartilage lesion of the patella (P = 0.043). No correlations were identified in other injuries in the adolescent group. The incidence of partial and complete MPFL tear in adult males and females were (34.4%, 65.6%) and (56.8%, 37.8%), respectively. Compared with adult females, adult males showed higher incidence of complete MPFL tear (P = 0.036). The incidence of articular cartilage lesion of patella in adult males and females were 56.3% and 32.4%, respectively. Compared with adult females, adult males showed higher incidence of articular cartilage lesion of patella (P = 0.047). The incidence of VMO injury in adult males and females were 59.4% and 35.1%, respectively. Compared with adult females, adult males showed higher incidence of VMO injury (P = 0.044). No correlations were identified in other injuries in the adult group. CONCLUSIONS Compared with females, males predispose to complete MPFL tear and articular cartilage lesion of patella after acute LPD. Compared with female adults, male adults predispose to VMO injury.
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Affiliation(s)
- Lei Zheng
- Department of Radiology, Shandong Provincial Corps Hospital of Chinese People's Armed Police Force, Jinan 250014, China
| | - Hong-Yu Ding
- Department of Ultrasonography, Shandong Provincial Qianfoshan Hospital, The First Hospital Affiliated to Shandong First Medical University, Jinan 250014, China
| | - Yan Feng
- Department of Radiology, Affiliated Hospital of Binzhou Medical University, Binzhou 256600, China
| | - Bai-Sheng Sun
- Department of Radiology, Shandong Provincial Corps Hospital of Chinese People's Armed Police Force, Jinan 250014, China
| | - Ling-Ling Zhu
- Department of Radiology, Shandong Provincial Corps Hospital of Chinese People's Armed Police Force, Jinan 250014, China
| | - Guang-Ying Zhang
- Department of Ultrasonography, Shandong Provincial Qianfoshan Hospital, The First Hospital Affiliated to Shandong First Medical University, Jinan 250014, China.
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Jiang B, Qiao C, Shi Y, Ren Y, Han C, Zhu Y, Na Y. Evaluation of risk correlation between recurrence of patellar dislocation and damage to the medial patellofemoral ligament in different sites caused by primary patellar dislocation by MRI: a meta-analysis. J Orthop Surg Res 2020; 15:461. [PMID: 33028358 PMCID: PMC7541236 DOI: 10.1186/s13018-020-01984-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 09/23/2020] [Indexed: 01/11/2023] Open
Abstract
Purpose Non-surgical treatment of primary patellar dislocation has a high risk of recurrent dislocation; thus, we tried to identify injuries in which sites of the medial patellofemoral ligament (MPFL) were most associated with recurrent dislocation by analyzing relevant original literature in order to provide improved suggestions on early surgical treatment. Methods According to the preset retrieval strategy, the original studies were retrieved until January 2020 using MEDLINE, Embase and Cochrane Library. Review Manager 5.3 software was used to summarize and compare the differences of recurrent dislocation of MPFL injuries at different attachments. Results Although the incidence of recurrent patellar dislocation at the femoral attachment of MPFL was higher overall (femoral only vs. patellar only vs. combined: 37.6% vs. 32.3% vs. 35.8%), no statistical difference was found among the three groups (femoral only vs. patellar only, RR = 1.32 [95% CI 0.89–1.95]; P = 0.17) (femoral only vs. combined, RR = 1.15 [95% CI 0.59–2.22]; P = 0.68) (patellar only vs. combined, RR = 0.94 [95% CI 0.69–1.29]; P = 0.72). In addition, the sulcus angle of recurrent dislocation group is significantly greater than that in the non-recurrent dislocation group (MD = 3.06 [95% CI 0.42–5.70]; P = 0.02). Conclusions Based on the pooled data collected from the original studies available, the risk of recurrent patellar dislocation due to damage to the MPFL at different sites did not differ. Additionally, the sulcus angle in the group with recurrent dislocation was considerably higher when comparing with the group without recurrent dislocation, that is, the shallower and flatter of the trochlear groove, the higher the risk of recurrent patellar dislocation.
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Affiliation(s)
- Boyong Jiang
- Baotou Medical College, Inner Mongolia University of Science and Technology, Jiuyuan District, Baotou, 014060, Inner Mongolia Autonomous Region, China
| | - Chenggang Qiao
- Department of Hand and Foot Surgery, The Second Affiliated Hospital of Inner Mongolia Medical University, Huimin District, Hohhot, 010030, Inner Mongolia Autonomous Region, China
| | - Yuting Shi
- Cardiac Function Department, Cadre Health Care Center, Inner Mongolia Autonomous Region People's Hospital, Saihan District, Hohhot, 010020, Inner Mongolia Autonomous Region, China
| | - Yizhong Ren
- Department of Arthroscopy and Sports Medicine, The Second Affiliated Hospital of Inner Mongolia Medical University, Huimin District, Hohhot, 010030, Inner Mongolia Autonomous Region, China
| | - Changxu Han
- Department of Arthroscopy and Sports Medicine, The Second Affiliated Hospital of Inner Mongolia Medical University, Huimin District, Hohhot, 010030, Inner Mongolia Autonomous Region, China.
| | - Yong Zhu
- Department of Spinal Surgery, The Second Affiliated Hospital of Inner Mongolia Medical University, Huimin District, Hohhot, 010030, Inner Mongolia Autonomous Region, China
| | - Yuyan Na
- Department of Arthroscopy and Sports Medicine, The Second Affiliated Hospital of Inner Mongolia Medical University, Huimin District, Hohhot, 010030, Inner Mongolia Autonomous Region, China.
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Hinckel BB, Baumann CA, Ejnisman L, Cavinatto LM, Martusiewicz A, Tanaka MJ, Tompkins M, Sherman SL, Chahla JA, Frank R, Yamamoto GL, Bicos J, Arendt L, Fithian D, Farr J. Evidence-based Risk Stratification for Sport Medicine Procedures During the COVID-19 Pandemic. J Am Acad Orthop Surg Glob Res Rev 2020; 4:e20.00083. [PMID: 33986224 PMCID: PMC7537824 DOI: 10.5435/jaaosglobal-d-20-00083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 07/16/2020] [Indexed: 01/08/2023]
Abstract
Orthopaedic practices have been markedly affected by the emergence of the COVID-19 pandemic. Despite the ban on elective procedures, it is impossible to define the medical urgency of a case solely on whether a case is on an elective surgery schedule. Orthopaedic surgical procedures should consider COVID-19-associated risks and an assimilation of all available disease dependent, disease independent, and logistical information that is tailored to each patient, institution, and region. Using an evidence-based risk stratification of clinical urgency, we provide a framework for prioritization of orthopaedic sport medicine procedures that encompasses such factors. This can be used to facilitate the risk-benefit assessment of the timing and setting of a procedure during the COVID-19 pandemic.
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Affiliation(s)
- Betina B Hinckel
- From the Oakland University, Rochester (Dr. Hinckel, and Dr. Cavinatto); Department of Orthopaedic Surgery, William Beaumont Hospital, Royal Oak (Dr. Hinckel, Dr. Cavinatto), MI; the University of Missouri-School of Medicine, Columbia, MO (Mr. Baumann); the Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de São Paulo, Sao Paulo, SP, BR (Dr. Ejnisman); the Shoulder and Elbow Surgery, Beaumont Orthopaedic Associates, Beaumont Health (Dr. Martusiewicz); the Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA (Dr. Tanaka); the Department of Orthopedic Surgery, TRIA Orthopedic Center, University of Minnesota, Gillette Children's Specialty Healthcare, MN (Dr. Tompkins); the Department of Orthopedic Surgery, Stanford University, CA (Dr. Sherman); the Rush University Medical Center, Chicago, IL (Dr. Chahla); the Division of Sports Medicine and Shoulder Surgery, Department of Orthopedics, Aurora, CO (Dr. Frank); the Department of Orthopaedic Surgery, Boston Children's Hospital, Harvard Medical School, Boston, MA (Dr. Yamamoto); CEGH-CEL, Instituto de Biociências, Universidade de São Paulo (Dr. Yamamoto); DASA Laboratories, Sao Paulo, Brazil (Dr. Yamamoto); the Michigan Orthopedic Surgeons, Fellowship Director William Beaumont Sports Medicine Fellowship, Assistant Professor Oakland University William Beaumont School of Medicine, MI (Dr. Bicos); the Department of Orthopaedic Surgery, University of Minnesota, Minneapolis, MN (Dr. Arendt); the Southern California Permanente Medical Group and Torrey Pines Orthopaedic Medical Group, San Diego, CA (Dr. Fithian); and the Knee Preservation, Cartilage Regeneration and OrthoBiologics, Department of Orthopedic Surgery, Indiana University School of Medicine, OrthoIndy and OrthoIndy Hospital, Greenwood and Indianapolis, IN (Dr. Farr)
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Frings J, Balcarek P, Tscholl P, Liebensteiner M, Dirisamer F, Koenen P. Conservative Versus Surgical Treatment for Primary Patellar Dislocation. DEUTSCHES ARZTEBLATT INTERNATIONAL 2020; 117:279-286. [PMID: 32519945 DOI: 10.3238/arztebl.2020.0279] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 08/14/2019] [Accepted: 02/10/2020] [Indexed: 12/22/2022]
Abstract
BACKGROUND Primary patellar dislocation is often the initial manifestation of patellofemoral instability. Its long-term consequences can include recurrent dislocation and permanent dysfunction of the knee joint. There is no consensus on the optimal treatment of primary patellar dislocation in the relevant literature. The main prerequisite for a good long-term result is a realistic assessment of the risk of recurrent dislocation. METHODS We carried out a systematic literature search in OvidSP (a search engine for full-text databases) and MEDLINE to identify suitable stratification models with respect to the risk of recurrent dislocation. RESULTS In the ten studies included in the current analysis, eight risk factors for recurrence after primary patellar dislocation were identified. Six studies revealed a higher risk in younger patients, particularly those under 16 years of age. The sex of the patient had no clear influence. In two studies, bilateral instability was identified as a risk factor. Two anatomical risk factors-a high-riding patella (patella alta) and trochlear dysplasia-were found to have the greatest influence in six studies. In a metaanalysis of five studies, patella alta predisposed to recurrent dislocation with an odds ratio (OR) of 4.259 (95% confidence interval [1.9; 9.188]). Moreover, a pathologically increased tibial tuberosity to trochlear groove (TT-TG) distance and rupture of the medial patellofemoral ligament (MPFL) on the femoral side were associated with higher recurrence rates. Patients with multiple risk factors in combination had a very high risk of recurrence. CONCLUSION The risk of recurrent dislocation after primary patellar dislocation is increased by a number of risk factors, and even more so when multiple such risk factors are present. Published stratification models enable an assessment of the individual risk profile. Patients at low risk can be managed conservatively; surgery should be considered for patients at high risk.
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Affiliation(s)
- Jannik Frings
- Department of Trauma and Orthopaedic Surgery, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany; ARCUS Kliniken Pforzheim, Pforzheim, Germany; Department of Orthopedic Surgery and Musculoskeletal Trauma Care Division, HUG-Hôpitaux Universitaires Genève, Geneva, Switzerland; Orthopedic Surgery, Medical University of Innsbruck, Innsbruck, Austria; Orthopedics & Sports Medicine Linz, UMIT - Private University for Health Sciences, Medical Informatics and Technology, Hall, Austria; Department of Orthopedics, Trauma Surgery and Sports Medicine, Cologne Merheim Medical Center, University of Witten/Herdecke, Cologne, Germany
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Huntington LS, Webster KE, Devitt BM, Scanlon JP, Feller JA. Factors Associated With an Increased Risk of Recurrence After a First-Time Patellar Dislocation: A Systematic Review and Meta-analysis. Am J Sports Med 2020; 48:2552-2562. [PMID: 31825650 DOI: 10.1177/0363546519888467] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Recurrent dislocations after a first-time lateral patellar dislocation may occur in more than 50% of patients and can cause long-term disability. Many factors have been suggested to influence the risk of recurrence. PURPOSE To systematically review and quantitatively synthesize the literature for factors associated with an increased risk of recurrence after a first-time patellar dislocation. STUDY DESIGN Systematic review and meta-analysis of observational studies. METHODS A total of 4 electronic databases were searched to identify relevant studies published before February 7, 2019. A quality assessment was performed with the National Heart, Lung, and Bone Institute quality assessment score. Factors assessed for their effect on the recurrence rate were documented, and the rates of recurrence were compared. Pooled dichotomous data were analyzed using random-effects meta-analysis with odds ratios (ORs). RESULTS A total of 17 studies met the criteria for inclusion. The overall rate of recurrent dislocations after a first-time lateral patellar dislocation was 33.6%. An increased risk of recurrence was reported in patients with a younger age (OR, 2.61; P < .00001), open physes (OR, 2.72; P < .00001), trochlear dysplasia (OR, 4.15; P = .009), an elevated tibial tuberosity-trochlear groove (TT-TG) distance (OR, 2.87; P < .00001), and patella alta (OR, 2.38; P = .004). Sex, patterns of medial patellofemoral ligament injury, and history of contralateral dislocations were not found to be associated with an increased recurrence rate (P≥ .05). In studies that reported on the presence of multiple risk factors, recurrence rates were 7.7% to 13.8% when no risk factors were present but increased to 29.6% to 60.2% when 2 risk factors were present and to 70.4% to 78.5% when 3 risk factors were present. CONCLUSION Younger age, open physes, trochlear dysplasia, elevated TT-TG distance, and patella alta were key risk factors for the recurrence of lateral patellar dislocations. Despite being not infrequently cited as risk factors, patient sex and a history of contralateral dislocations were not found to be significant risk factors. The presence of multiple risk factors increased the risk, and the development of predictive instability scores in large patient cohorts using all established risk factors should be a focus of future studies.
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Affiliation(s)
- Lachlan S Huntington
- Melbourne Medical School, University of Melbourne, Melbourne, Victoria, Australia.,OrthoSport Victoria Research Unit, Epworth HealthCare, Melbourne, Victoria, Australia
| | - Kate E Webster
- School of Allied Health, Human Services and Sport, La Trobe University, Melbourne, Victoria, Australia
| | - Brian M Devitt
- OrthoSport Victoria Research Unit, Epworth HealthCare, Melbourne, Victoria, Australia
| | - John P Scanlon
- OrthoSport Victoria Research Unit, Epworth HealthCare, Melbourne, Victoria, Australia
| | - Julian A Feller
- OrthoSport Victoria Research Unit, Epworth HealthCare, Melbourne, Victoria, Australia.,School of Allied Health, Human Services and Sport, La Trobe University, Melbourne, Victoria, Australia
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Differential Contributions of the Quadriceps and Patellar Attachments of the Proximal Medial Patellar Restraints to Resisting Lateral Patellar Translation. Arthroscopy 2020; 36:1670-1676. [PMID: 32061974 DOI: 10.1016/j.arthro.2020.01.058] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 01/21/2020] [Accepted: 01/31/2020] [Indexed: 02/02/2023]
Abstract
PURPOSE To define the contributions of the of the medial patellofemoral ligament (MPFL) and medial quadriceps tendon femoral ligament (MQTFL) to lateral patellar translation as the knee moves through a 90° arc of motion. METHODS Six pairs of bilateral cadaveric knee specimens (12 knees) were dissected and potted in perfect lateral position using fluoroscopy. An eye screw was placed in the midpoint on the lateral aspect of the patella. Each knee underwent testing in 4 conditions after sequential sectioning: intact, lateral retinacular release, randomized MQTFL or MPFL sectioning, and complete proximal medial patellar restraint (PMPR) sectioning. With a custom machined jig, all knees were tested at 0, 10, 20, 30, 45, 60, and 90° of flexion on an MTS machine with 20N of lateral patellar force applied and displacement recorded. RESULTS PMPR extensor mechanism insertion on all specimens was identified 50% on the quadriceps tendon and 50% on the proximal aspect of the medial patella. Isolated MPFL sectioning resulted in significantly increased lateral displacement compared to the lateral release state at all flexion angles tested except 0°. There was significantly increased lateral patellar displacement with complete sectioning compared with isolated proximal sectioning at all degrees of knee flexion except 0°. However, complete sectioning following isolated MPFL sectioning did not demonstrate significance at any angle. CONCLUSIONS Compared with the MQTFL, the MPFL is primarily responsible for resistance to lateral patellar translation throughout a 0° to 90° arc of motion. The MPFL provides a similar resistance to lateral patellar displacement as the fully intact PMPR; however, the MQTFL may contribute to resistance in full extension. CLINICAL SIGNIFICANCE Proximal medial patellar restraint reconstruction techniques involving both the patellar and quadriceps insertion have been described; however, the unique contributions of the native anatomy to lateral patellar restraint have not been investigated.
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Treatment of First-time Patellar Dislocations and Evaluation of Risk Factors for Recurrent Patellar Instability. Sports Med Arthrosc Rev 2020; 27:130-135. [PMID: 31688530 DOI: 10.1097/jsa.0000000000000239] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Approximately one-third of skeletally mature patients with primary patellar dislocation will experience recurrent patellar instability over time. Because of the multifactorial combination of features contributing to overall stability of the patellofemoral joint, first-time patella dislocation presents a challenge to the treating physician. A detailed patient history, focused physical examination, and appropriate diagnostic imaging are essential for identifying risk factors for recurrent instability. Individual risk factors include young patient age, patella alta, trochlear dysplasia, and lateralization of the tibial tubercle. In combination these factors may pose even greater risk, and recently published predictive scoring models offer clinicians objective criteria to identify patients most at risk for recurrence. In patients at low risk of recurrence, nonoperative management can be effective, with "a la carte" surgical treatments gaining popularity in those with a higher than acceptable risk of re-dislocation.
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Nakamura S, Shima K, Kuriyama S, Nishitani K, Ito H, Matsuda S. Tibial Tubercle-Trochlear Groove Distance Influences Patellar Tilt After Total Knee Arthroplasty. J Arthroplasty 2019; 34:3080-3087. [PMID: 31451393 DOI: 10.1016/j.arth.2019.07.038] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 07/23/2019] [Accepted: 07/28/2019] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Tibial tubercle-trochlear groove (TT-TG) distance is associated with a greater risk of recurrent patellar dislocation in young, active patients. However, the effect of TT-TG distance after total knee arthroplasty (TKA) has not been investigated. The purpose is to analyze the effect of TT-TG distance and component rotation on patellar tilt and patellar shift after TKA. METHODS After TKA, axial computed tomography scans and axial radiograph were taken in 115 consecutive knees. TT-TG distance was measured between the most anterior point of the tibial tuberosity and the deepest point of the femoral component relative to a line connecting the anterior condyles. Femoral and tibial component rotation was measured relative to the femoral and tibial rotational axis, respectively. Pearson correlation coefficients were calculated. RESULTS TT-TG distance had a significant correlation with patellar tilt in extension (R = 0.220, P = .018), patellar tilt in flexion (R = 0.438, P < .001), and patellar shift (R = 0.330, P < .001). Tibial component rotation had a significant correlation with patellar tilt in flexion (R = -0.251, P = .007) and patellar shift (R = -0.360, P < .001). Femoral component rotation had no significant correlations. Tibial component rotation had a significant correlation with TT-TG distance (R = -0.573, P < .001), whereas femoral component rotation had no correlation (P = .192). CONCLUSION TT-TG distance had a significant correlation with patellar tilt and patellar shift. Surgeons need to understand the factors affecting TT-TG distance and to pay attention to avoiding excessive TT-TG distance after TKA.
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Affiliation(s)
- Shinichiro Nakamura
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Koichiro Shima
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Shinichi Kuriyama
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Kohei Nishitani
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Hiromu Ito
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
| | - Shuichi Matsuda
- Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, Kyoto, Japan
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Kernkamp WA, Wang C, Li C, Hu H, van Arkel ERA, Nelissen RGHH, LaPrade RF, van de Velde SK, Tsai TY. The Medial Patellofemoral Ligament Is a Dynamic and Anisometric Structure: An In Vivo Study on Length Changes and Isometry. Am J Sports Med 2019; 47:1645-1653. [PMID: 31070936 DOI: 10.1177/0363546519840278] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Medial patellofemoral ligament (MPFL) reconstruction is associated with a high rate of complications, including recurrent instability and persistent knee pain. Technical errors are among the primary causes of these complications. Understanding the effect of adjusting patellofemoral attachments on length change patterns may help surgeons to optimize graft placement during MPFL reconstruction and to reduce graft failure rates. PURPOSE To determine the in vivo length changes of the MPFL during dynamic, weightbearing motion and to map the isometry of the 3-dimensional wrapping paths from various attachments on the medial femoral epicondyle to the patella. STUDY DESIGN Descriptive laboratory study. METHODS Fifteen healthy participants were studied with a combined computed tomography and biplane fluoroscopic imaging technique during a lunge motion (full extension to ~110° of flexion). On the medial femoral epicondyle, 185 attachments were projected, including the anatomic MPFL footprint, which was divided into 5 attachments (central, proximal, distal, posterior, and anterior). The patellar MPFL area was divided into 3 possible attachments (proximal, central, and distal). The length changes of the shortest 3-dimensional wrapping paths of the various patellofemoral combinations were subsequently measured and mapped. RESULTS For the 3 patellar attachments, the most isometric attachment, with an approximate 4% length change, was located posterior and proximal to the anatomic femoral MPFL attachment, close to the adductor tubercle. Attachments proximal and anterior to the isometric area resulted in increasing lengths with increasing knee flexion, whereas distal and posterior attachments caused decreasing lengths with increasing knee flexion. The anatomic MPFL was tightest in extension, decreased in length until approximately 30° of flexion, and then stayed near isometric for the remainder of the motion. Changing both the femoral and patellar attachments significantly affected the length changes of the anatomic MPFL ( P < .001 for both). CONCLUSION The most isometric location for MPFL reconstruction was posterior and proximal to the anatomic femoral MPFL attachment. The anatomic MPFL is a dynamic, anisometric structure that was tight in extension and early flexion and near isometric beyond 30° of flexion. CLINICAL RELEVANCE Proximal and anterior MPFL tunnel positioning should be avoided, and the importance of anatomic MPFL reconstruction is underscored with the results found in this study.
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Affiliation(s)
- Willem A Kernkamp
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China.,Leiden University Medical Center, Leiden, the Netherlands
| | - Cong Wang
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Changzou Li
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Hai Hu
- Department of Orthopaedic Surgery and Orthopaedic Biomechanical Laboratory, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | | | | | | | | | - Tsung-Yuan Tsai
- Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China.,Engineering Research Center of Clinical Translational Digital Medicine, Ministry of Education of P.R. China, Shanghai, China
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