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Bone Disorders

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...

Compact Bone

Compact Bone

Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...

Bone Formation by Endochondral Ossification

Bone Formation by Endochondral Ossification

Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...

Bone Markings

Bone Markings

Bones have various surface features that help form joints and attach to other soft tissues. Depending on the function, bone markings are categorized into articulating projections, processes for attachment, depressions, and openings.
Articulating Projections
Articulating projections are found where two bones meet to form a joint. These structures are usually found at the ends of bones. The largest articulation is a rounded projection called the head, supported by a narrow neck at the ends of...

Osteoclasts in Bone Remodeling

Osteoclasts in Bone Remodeling

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...

Disorders of the Skeletal Muscle

Disorders of the Skeletal Muscle

The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...

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Case Series - Osteochondromas at Rare Locations.

Gireesh Khodnapur¹, Shreepad Kulkarni¹, Vijaykumar Patil¹

¹Department of Orthopedics, B.L.D.E (DU) Shri B. M. Patil Medical College Hospital and Research Centre, Vijayapua, Karnataka, India.

Journal of Orthopaedic Case Reports

|May 5, 2023

Summary

Osteochondromas are common bone tumors, but can occur in rare locations like the skull and small bones. This study details five such cases, highlighting varied presentations and management strategies for these unusual osteochondromas.

Keywords:

Scapula excision fibula metacarpal skull

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Area of Science:

Orthopedic Surgery
Skeletal Radiology
Pathology

Background:

Osteochondromas are the most common benign bone tumors, typically affecting long bones.
Rare presentations involve flat bones, pelvis, scapula, skull, and small bones of the hands and feet.
Clinical and radiological presentation of osteochondromas varies significantly based on anatomical location.

Observation:

This report details five cases of osteochondromas in rare anatomical sites.
Cases include one metacarpal osteochondroma, one skull exostosis, two scapular exostoses, and one fibular exostosis.
These cases demonstrate the diverse clinical and radiological features of osteochondromas in unusual locations.

Findings:

Osteochondromas can manifest in extraskeletal and unusual skeletal locations.
Accurate diagnosis requires thorough evaluation of swelling and pain over bony regions.
Management strategies are tailored to the specific site and presentation of the osteochondroma.

Implications:

Highlights the importance of considering osteochondromas in differential diagnoses for bony swellings, even in rare locations.
Emphasizes the need for comprehensive imaging and clinical assessment for accurate diagnosis and appropriate management.
Contributes to the understanding of osteochondroma variability and informs clinical practice for rare presentations.