Related Experiment Video
Updated: Jul 19, 2026

Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model
Published on: November 4, 2025
Down syndrome in children: the role of the orthopaedic surgeon
Michelle S Caird1, Brian P D Wills, John P Dormans
1Department of Orthopaedic Surgery, University of Michigan Medical School, Ann Arbor, USA.
Insights
Down syndrome (trisomy 21) frequently causes musculoskeletal issues due to hypotonia and laxity. This can lead to cervical instability and other orthopedic conditions requiring careful management.
Area of Science:
- Genetics and Human Biology
- Orthopedics
- Developmental Pediatrics
Background:
- Down syndrome, caused by trisomy 21, is a common chromosomal abnormality.
- Patients exhibit characteristic features, variable cognitive abilities, and associated medical conditions.
- Musculoskeletal manifestations are prevalent, often stemming from hypotonia, joint hypermobility, and ligamentous laxity.
Purpose of the Study:
- To review the common orthopedic manifestations in patients with Down syndrome.
- To discuss the challenges in managing these conditions, particularly cervical instability.
- To highlight the controversies surrounding screening methods for atlanto-occipital and cervical instability.
Main Methods:
- Literature review of orthopedic conditions associated with Down syndrome.
- Analysis of the impact of hypotonia and laxity on musculoskeletal development.
- Discussion of diagnostic and management strategies for common orthopedic issues.
Main Results:
- Atlanto-occipital and atlantoaxial instability are significant concerns due to bony anomalies and laxity.
- Scoliosis, hip instability, slipped capital femoral epiphysis, patellar instability, and foot deformities are frequently observed.
- Screening protocols for cervical instability, especially for sports participation, remain debated.
Conclusions:
- Orthopedic conditions are a major challenge in managing patients with Down syndrome.
- Careful monitoring and tailored treatment are essential for improving patient outcomes.
- Further research is needed to standardize screening and management protocols for these patients.
Abstract:
Down syndrome, the result of trisomy of chromosome 21, is one of the most common chromosomal abnormalities. Patients have a characteristic facial appearance, variable levels of intelligence and self-care skills, and a variety of associated medical conditions. Orthopaedic manifestations occur frequently; most are related to hypotonia, joint hypermobility, and ligamentous laxity. Atlanto-occipital and atlantoaxial hypermobility, as well as bony anomalies of the cervical spine, can produce atlanto-occipital and cervical instability. Methods of screening for this instability, particularly with regard to participation in sports, are a subject of controversy. Scoliosis, hip instability, slipped capital femoral epiphysis, patellar instability, and foot deformities are other musculoskeletal conditions found in patients with Down syndrome that can be challenging for the orthopaedic surgeon to treat.
Related Concept Videos
Changes in the Appendicular Skeleton with Age
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Meiosis I
Karyotyping
Sutures of the Skull
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...
Introduction to the Skeletal System
Components of the Skeletal System
Bone, or osseous tissue, is a hard connective tissue that forms an internal support structure for the human body. Bones shield vulnerable organs and soft tissue from external forces. For example, the vertebral bones protect and support the spinal cord.
Cartilage, a semi-rigid connective tissue found in regions such as...

