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Mu J, Xiong S, Yang G, Wang F, Li X, Gao Q, Niu Q, Wong SSC, Xu X, Chan Y, Li Y. Lumbar Epidural versus Caudal Epidural for Postoperative Analgesia After Lower Extremity Osteotomy Surgery in Pediatric Patients with Osteogenesis Imperfecta: A Propensity-Matched Cohort Analysis in a Single-Center Over 9 Years. J Pain Res 2024; 17:2645-2656. [PMID: 39155955 PMCID: PMC11330249 DOI: 10.2147/jpr.s466745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2024] [Accepted: 07/26/2024] [Indexed: 08/20/2024] Open
Abstract
Purpose Although pediatric epidural analgesia is a well-established technique used perioperatively. It is unclear whether a lumbar or caudal epidural is suitable for osteogenesis imperfecta (OI) patients, which may be associated with brittle bones and spine deformity. We conducted a retrospective study to investigate and compare the efficacy of the two continuous epidural techniques in pediatric patients undergoing lower extremity osteotomy surgery using a propensity score-matched analysis (PSMA). Patients and Methods A total of 274 patients were included. Patients' age, weight, and height were adjusted using PSMA. 90 patients were matched for further analysis, with 45 patients in the lumbar epidural group (Group L) and 45 patients in the caudal epidural group (Group C). Pain scores were categorized into three grades: mild (0-3), moderate (4-6), and severe (7-10), and compared between the two groups. Additionally, operation time, operation site, blood loss, scoliosis, oral analgesic medications, and catheter or nerve-related complications were compared. Results There were no significant differences in operation time, operation site, scoliosis, and blood loss between the two groups. The percentage of moderate to severe pain during movement was significantly higher in Group L than in Group C, with 37.5% versus 17.5% on the second-day post-operation (P=0.039). However, no statistically significant difference was observed on other days. Additionally, there was no significant difference in oral medication consumption and complications between the two groups. Conclusion Both lumbar and caudal epidural analgesia can be effectively used postoperatively, and a caudal epidural should be considered where performing a lumbar epidural is challenging in OI pediatric patients.
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Affiliation(s)
- Jingjing Mu
- Department of Anesthesiology, the First Affiliated Hospital of Jinan University, Guangzhou, Guangdong, 510630, People’s Republic of China
- Department of Anaesthesiology, the University of Hong Kong Shenzhen Hospital, Shenzhen, People’s Republic of China
| | - Shiyi Xiong
- Department of Anaesthesiology, the University of Hong Kong Shenzhen Hospital, Shenzhen, People’s Republic of China
| | - Guixiang Yang
- Department of Anaesthesiology, the University of Hong Kong Shenzhen Hospital, Shenzhen, People’s Republic of China
| | - Fengfeng Wang
- Department of Anaesthesiology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, the University of Hong Kong, Hong Kong
| | - Xuanying Li
- Department of Anaesthesiology, the University of Hong Kong Shenzhen Hospital, Shenzhen, People’s Republic of China
| | - Qiong Gao
- Department of Anaesthesiology, the University of Hong Kong Shenzhen Hospital, Shenzhen, People’s Republic of China
| | - Qiang Niu
- Department of Anaesthesiology, the University of Hong Kong Shenzhen Hospital, Shenzhen, People’s Republic of China
| | - Stanley Sau Ching Wong
- Department of Anaesthesiology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, the University of Hong Kong, Hong Kong
| | - Xuebing Xu
- Department of Anaesthesiology, the University of Hong Kong Shenzhen Hospital, Shenzhen, People’s Republic of China
| | - Yauwai Chan
- Department of Anaesthesiology, the University of Hong Kong Shenzhen Hospital, Shenzhen, People’s Republic of China
| | - Yalan Li
- Department of Anesthesiology, the First Affiliated Hospital of Jinan University, Guangzhou, Guangdong, 510630, People’s Republic of China
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Elbaseet HM, Ibrahim AH, Oyoun NA, Abdelzaher MA, Khaled M. Management of Combined Fracture Neck of Femur and Femoral Deformity in Osteogenesis Imperfecta Patient: A Case Report. Strategies Trauma Limb Reconstr 2024; 19:56-59. [PMID: 38752190 PMCID: PMC11091891 DOI: 10.5005/jp-journals-10080-1611] [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: 10/11/2023] [Accepted: 03/30/2024] [Indexed: 05/18/2024] Open
Abstract
Osteogenesis imperfecta (OI) patients usually sustain repeated fractures from trivial trauma and also have skeletal deformities that affect walking. The bone fragility and repeated fractures produce deformities of the long bones especially in femur and tibia. However, neck of femur (NOF) fractures in OI are rarely described. A 11-year-old male patient known to have OI (Sillence type IV) sustained a NOF fracture after a fall. He also had proximal femoral anterolateral bowing proximally and over an intramedullary (IM) rod inserted 4 years back. He was treated by corrective osteotomy and stabilisation with an IM telescoping nail for the deformed femur and the Wagner technique for the NOF fracture. One year after operation, the patient had recovered satisfactory functional outcome with union of the NOF fracture and correction of the femoral deformity. Conclusion The method of the Wagner technique can achieve stable fixation for femoral neck fractures and introduces the least interference with concurrent telescoping nail insertion. How to cite this article Elbaseet HM, Ibrahim AH, Abol Oyoun N, et al. Management of Combined Fracture Neck of Femur and Femoral Deformity in Osteogenesis Imperfecta Patient: A Case Report. Strategies Trauma Limb Reconstr 2024;19(1):56-59.
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Affiliation(s)
- Hesham Mohamed Elbaseet
- Pediatric Orthopedic Unit, Department of Orthopedic Surgery and Traumatology, Assiut University, Egypt
| | - AbdelKhalek Hafez Ibrahim
- Pediatric Orthopedic Unit, Department of Orthopedic Surgery and Traumatology, Assiut University, Egypt
| | - Nariman Abol Oyoun
- Pediatric Orthopedic Unit, Department of Orthopedic Surgery and Traumatology, Assiut University, Egypt
| | | | - Mohamed Khaled
- Pediatric Orthopedic Unit, Department of Orthopedic Surgery and Traumatology, Assiut University, Egypt
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Ngo D, Todd M, Accadbled F, Foster B, Jellesen MS, Rölfing JD, Rawat J. Corrosion of a Fassier-Duval Telescopic Nail Causing Pain and Osteolysis: A Case Report. JBJS Case Connect 2024; 14:01709767-202403000-00003. [PMID: 38181104 DOI: 10.2106/jbjs.cc.23.00424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2024]
Abstract
CASE A 15-year-old girl known with osteogenesis imperfecta presented with left femoral pain. She had been treated with multiple Fassier-Duval intramedullary nails, which were still in situ. Radiographic imaging demonstrated focal osteolysis and periosteal reaction at the telescopic junction of the rod in the distal femur. She underwent implant removal. Intraoperative sampling demonstrating acute sterile inflammation and presence of brownish colored particles consistent with metal debris and osteolysis. Explant analysis confirmed corrosion of the stainless-steel telescopic nail as the underlying cause. CONCLUSION Osteolysis and periosteal reaction because of corrosion should be considered in conjunction with other more common causes of pain, such as fracture or infection, in patients treated with telescopic intramedullary nails.
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Affiliation(s)
- David Ngo
- Flinders Medical Centre, Bedford Park, Australia
| | - Maya Todd
- Flinders Medical Centre, Bedford Park, Australia
| | | | - Bruce Foster
- Flinders Medical Centre, Bedford Park, Australia
| | - Morten Stendahl Jellesen
- Department of Civil and Mechanical Engineering, Technical University of Denmark, Lyngby, Denmark
| | - Jan Duedal Rölfing
- Children's Orthopaedics and Reconstruction, Aarhus University Hospital, Aarhus, Denmark
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Malina SN, Flanagan JC, Loechner KJ, Wu M. Access to care among patients with osteogenesis imperfecta during the COVID-19 pandemic. Arch Osteoporos 2023; 18:143. [PMID: 38015270 PMCID: PMC10924804 DOI: 10.1007/s11657-023-01355-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 11/17/2023] [Indexed: 11/29/2023]
Abstract
In a cross-sectional study assessing the experiences of individuals with osteogenesis imperfecta accessing care during the COVID-19 pandemic, participants reported high rates of delays in accessing medical care and high utilization of telehealth. Considering the needs of individuals with complex medical conditions is important when improving access to care. PURPOSE Individuals with osteogenesis imperfecta (OI) often have complex care needs requiring that they see a variety of specialists. The onset of the COVID-19 pandemic in March 2020 led to delays in medical care for many health conditions. The goal of this study was to describe the experiences of individuals with OI accessing medical care during this time. METHODS Responses to an electronic survey distributed via the OI Foundation mailing list were collected from August 2020 until February 2021. Participants were instructed to compare their experiences in the months since the start of the pandemic with their experiences prior to this date. Data were analyzed using descriptive statistics and were compared across demographic groups using logistic regression and chi-squared tests. RESULTS Surveys were completed by 110 participants. Most participants (72%) reported experiencing delays in accessing at least one care provider. The majority of participants reported less or similar amounts of bone pain (74.3%) and less or the same rate of fracture (88.6%) as before the start of the pandemic. CONCLUSION While most study participants experienced delays in care, they did not report an increase in symptoms associated with OI. They also frequently utilized telehealth as a tool to see their providers. Future research should focus on the impact of changes in telehealth legislation on patients' ability to access care. As methods for care delivery evolve, the needs of people with OI and other rare diseases should be considered and prioritized.
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Affiliation(s)
- Sara N Malina
- Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics, Johns Hopkins University School of Medicine, 200 N. Wolfe St., Suite 3120, Baltimore, MD, 21287, USA
| | - Jill C Flanagan
- Children's Physician Group-Orthopedics and Sports Medicine at Children's Healthcare of Atlanta, Atlanta, GA, USA
| | - Karen J Loechner
- Division of Pediatric Endocrinology and Children's Healthcare of Atlanta Pediatric Bone Clinic, Department of Pediatrics, Emory University School of Medicine, Atlanta, GA, USA
- Division of Pediatric Endocrinology, Department of Pediatrics, Connecticut Children's Hospital, Hartford, CT, USA
| | - Malinda Wu
- Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics, Johns Hopkins University School of Medicine, 200 N. Wolfe St., Suite 3120, Baltimore, MD, 21287, USA.
- Division of Pediatric Endocrinology and Children's Healthcare of Atlanta Pediatric Bone Clinic, Department of Pediatrics, Emory University School of Medicine, Atlanta, GA, USA.
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Shao C, Liu Y, Zhao Y, Jing Y, Li J, Lv Z, Fu T, Wang Z, Li G. DNA methyltransferases inhibitor azacitidine improves the skeletal phenotype of mild osteogenesis imperfecta by reversing the impaired osteogenesis and excessive osteoclastogenesis. Bone 2023; 170:116706. [PMID: 36822490 DOI: 10.1016/j.bone.2023.116706] [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: 08/22/2022] [Revised: 02/06/2023] [Accepted: 02/12/2023] [Indexed: 02/24/2023]
Abstract
BACKGROUND Osteogenesis imperfecta (OI), as a disease of congenital bone dysplasia, is often accompanied by the abnormal alteration of bone absorption and bone formation. DNA methyltransferases (Dnmts) can regulate the gene expression involved in osteogenesis and osteoclastogenesis. Dnmts changes and their effects on bone cells under OI is poorly understood. METHODS The Dnmts expression in adipose derived mesenchymal stem cells (ADSCs), bone marrow derived pre-osteoclasts (pre-Ocs) and femurs of Col1a2oim/+ and Col1a1+/-365 mice, both modeling mild OI types, were determined. The effects of azacitidine (Aza) administration and Dnmt3a knockdown by ShRNA on the osteogenic differentiation of ADSCs together with osteoclasts (Ocs) production of pre-Ocs were studied in vitro. The synthesis and secretion of collagen fibers of OI derived ADSCs were examined. The therapeutic outcomes of intraperitoneal (i.p.) infused Aza (1 mg/kg/2d) for 30 days were evaluated in OI mice. RESULTS Obviously elevated expression of Dnmts, especially Dnmt3a, existed in ADSCs, pre-Ocs, and femurs isolated from OI modeled mice. Much more collagen molecules of mutant ADSCs were secreted into the extracellular medium post Aza addition. Both Aza administration and Dnmt3a knockdown effectively enhanced the bone-forming capacity of affected ADSCs and reduced Ocs formation of OI mice in vitro. Aza treatment apparently improved the femora microstructure and biomechanical properties, increased bone formation and decreased the number of Ocs in mice with OI. CONCLUSION Highly expressed Dnmt3a contributed to the impaired osteogenesis and enhanced osteoclastogenesis of collagen defect-related OI. Aza medication effectively improved the femora phenotype of the two types of OI modeled mice partly by Dnmts inhibition and modulating cell stress response. These findings facilitated understanding the role of Dnmts alteration in skeletal pathological development of mild OI and preliminary confirmed the therapeutic potential of Dnmts depressants in mild OI treatment. Still, further researches are needed to explore the specific function of Dnmts in OI bones and clarify the benefits of Aza administration in OI treatment.
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Affiliation(s)
- Chenyi Shao
- Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, People's Republic of China
| | - Yi Liu
- Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, People's Republic of China
| | - Yuxia Zhao
- Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, People's Republic of China
| | - Yaqing Jing
- Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, People's Republic of China
| | - Jiaci Li
- Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, People's Republic of China
| | - Zhe Lv
- Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, People's Republic of China
| | - Ting Fu
- Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, People's Republic of China
| | - Zihan Wang
- Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, People's Republic of China
| | - Guang Li
- Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, People's Republic of China.
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Lang E, Semon JA. Mesenchymal stem cells in the treatment of osteogenesis imperfecta. CELL REGENERATION (LONDON, ENGLAND) 2023; 12:7. [PMID: 36725748 PMCID: PMC9892307 DOI: 10.1186/s13619-022-00146-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 10/18/2022] [Indexed: 02/03/2023]
Abstract
Osteogenesis imperfecta (OI) is a disease caused by mutations in different genes resulting in mild, severe, or lethal forms. With no cure, researchers have investigated the use of cell therapy to correct the underlying molecular defects of OI. Mesenchymal stem cells (MSCs) are of particular interest because of their differentiation capacity, immunomodulatory effects, and their ability to migrate to sites of damage. MSCs can be isolated from different sources, expanded in culture, and have been shown to be safe in numerous clinical applications. This review summarizes the preclinical and clinical studies of MSCs in the treatment of OI. Altogether, the culmination of these studies show that MSCs from different sources: 1) are safe to use in the clinic, 2) migrate to fracture sites and growth sites in bone, 3) engraft in low levels, 4) improve clinical outcome but have a transient effect, 5) have a therapeutic effect most likely due to paracrine mechanisms, and 6) have a reduced therapeutic potential when isolated from patients with OI.
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Affiliation(s)
- Erica Lang
- grid.260128.f0000 0000 9364 6281Department of Biological Sciences, Missouri University of Science and Technology, 400 W 11th St., Rolla, MO USA
| | - Julie A. Semon
- grid.260128.f0000 0000 9364 6281Department of Biological Sciences, Missouri University of Science and Technology, 400 W 11th St., Rolla, MO USA
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Ross J, Bowden MR, Yu C, Diaz-Thomas A. Transition of young adults with metabolic bone diseases to adult care. Front Endocrinol (Lausanne) 2023; 14:1137976. [PMID: 37008909 PMCID: PMC10064010 DOI: 10.3389/fendo.2023.1137976] [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: 01/05/2023] [Accepted: 03/06/2023] [Indexed: 03/19/2023] Open
Abstract
As more accurate diagnostic tools and targeted therapies become increasingly available for pediatric metabolic bone diseases, affected children have a better prognosis and significantly longer lifespan. With this potential for fulfilling lives as adults comes the need for dedicated transition and intentional care of these patients as adults. Much work has gone into improving the transitions of medically fragile children into adulthood, encompassing endocrinologic conditions like type 1 diabetes mellitus and congenital adrenal hyperplasia. However, there are gaps in the literature regarding similar guidance concerning metabolic bone conditions. This article intends to provide a brief review of research and guidelines for transitions of care more generally, followed by a more detailed treatment of bone disorders specifically. Considerations for such transitions include final adult height, fertility, fetal risk, heritability, and access to appropriately identified specialists. A nutrient-dense diet, optimal mobility, and adequate vitamin D stores are protective factors for these conditions. Primary bone disorders include hypophosphatasia, X-linked hypophosphatemic rickets, and osteogenesis imperfecta. Metabolic bone disease can also develop secondarily as a sequela of such diverse exposures as hypogonadism, a history of eating disorder, and cancer treatment. This article synthesizes research by experts of these specific disorders to describe what is known in this field of transition medicine for metabolic bone diseases as well as unanswered questions. The long-term objective is to develop and implement strategies for successful transitions for all patients affected by these various conditions.
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Affiliation(s)
- Jordan Ross
- Division of Pediatric Endocrinology, University of Tennessee Health Science Center, Memphis, TN, United States
- *Correspondence: Jordan Ross,
| | - Michelle R. Bowden
- Division of General Pediatrics, University of Tennessee Health Science Center, Memphis, TN, United States
- Le Bonheur Children’s Hospital, Memphis, TN, United States
| | - Christine Yu
- Endocrinology Division, St. Jude Children’s Research Hospital, Memphis, TN, United States
| | - Alicia Diaz-Thomas
- Division of Pediatric Endocrinology, University of Tennessee Health Science Center, Memphis, TN, United States
- Le Bonheur Children’s Hospital, Memphis, TN, United States
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Shigley C, Ibrahim Z, Kosinski LR, Cruz AI. Atraumatic Displaced Femoral Neck Insufficiency Fracture Because of Severe Hypocalcemia in a Pediatric Patient: A Case Report. JBJS Case Connect 2022; 12:01709767-202212000-00015. [PMID: 36820612 DOI: 10.2106/jbjs.cc.22.00346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 08/25/2022] [Indexed: 02/24/2023]
Abstract
CASE This is a case of a 14-year-old autistic boy who presented with an atraumatic transcervical femoral neck fracture in the setting of significant hypocalcemia and vitamin D deficiency. We discuss his surgical and medical management and metabolic derangements associated with atraumatic femoral neck fractures. CONCLUSION Pediatric femoral neck fractures in the absence of trauma are uncommon and often have underlying metabolic abnormalities. In addition, autism poses unique challenges in caring for these patients who are at an increased risk of complications. Interdisciplinary care is integral to achieving successful outcomes.
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Affiliation(s)
| | - Zainab Ibrahim
- Division of Pediatric Orthopaedic Surgery, Department of Orthopaedics, Alpert Medical School of Brown University, Providence, Rhode Island
| | - Lindsay R Kosinski
- Division of Pediatric Orthopaedic Surgery, Department of Orthopaedics, Alpert Medical School of Brown University, Providence, Rhode Island
| | - Aristides I Cruz
- Division of Pediatric Orthopaedic Surgery, Department of Orthopaedics, Alpert Medical School of Brown University, Providence, Rhode Island
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Nuss Procedure for pectus excavatum repair in a patient with osteogenesis imperfecta. JOURNAL OF PEDIATRIC SURGERY CASE REPORTS 2022. [DOI: 10.1016/j.epsc.2022.102311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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10
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Liau ZQG, Wang Y, Lin HY, Cheong CK, Gupta S, Hui JHP. Orthopedic concerns of a child with short stature. Curr Opin Pediatr 2022; 34:82-91. [PMID: 34840250 DOI: 10.1097/mop.0000000000001081] [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: 10/19/2022]
Abstract
PURPOSE OF REVIEW Pediatric short stature poses severe concerns to the patient, parents, and physicians. Management for pediatric short stature is still widely debated due to heterogenous etiological factors and treatment options. This review will address the approach to pediatric short stature, commonly within the subset of skeletal dysplasia resulting in disproportionate short stature. The following will be discussed: the etiology, clinical, and radiological evaluations, and management for pediatric short stature. RECENT FINDINGS Early recognition of short stature and appropriate referrals is shown to benefit the patient and reduce parental concern. A multidisciplinary team, comprising an orthopedic surgeon, is fundamental to provide holistic care and ensure overall good quality of life. Advancements in clinical diagnostic tools and diversified treatment modalities today provides optimism in managing pediatric short stature. SUMMARY Skeletal dysplasia can be treated with good prognosis if diagnosed and managed early. Thorough clinical, radiological, laboratory, and even genetic investigations are important to differentiate and manage various types of skeletal dysplasia. Our review will provide a comprehensive and up-to-date approach to skeletal dysplasia for pediatric orthopedic surgeons, and indications for physicians to refer patients with suspected short stature to pediatric orthopedic surgeons.
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Affiliation(s)
- Zi Qiang Glen Liau
- University Orthopaedic, Hand and Reconstructive Microsurgery Cluster
- Department of Orthopaedic Surgery, National University Health System
| | - Yuhang Wang
- National University of Singapore, Yong Loo Lin School of Medicine, Singapore
| | - Hong-Yi Lin
- National University of Singapore, Yong Loo Lin School of Medicine, Singapore
| | - Chin Kai Cheong
- National University of Singapore, Yong Loo Lin School of Medicine, Singapore
| | - Shobhit Gupta
- University Orthopaedic, Hand and Reconstructive Microsurgery Cluster
- Department of Orthopaedic Surgery, National University Health System
| | - James Hoi Po Hui
- University Orthopaedic, Hand and Reconstructive Microsurgery Cluster
- Department of Orthopaedic Surgery, National University Health System
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