Extradural Thecal Sac Indentation

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 14 min read
Patient Tools

Read, save, and share this guide

Use these quick tools to make this medical article easier to read, print, save, or share with a family member.

Patient Mode

Understand this article easily

Switch between simple English and easy Bangla patient notes. This is for education and does not replace a doctor consultation.

Extradural thecal sac indentation, also known as thecal sac effacement or compression, is a radiological finding seen on MRI or CT scans when structures outside the dura mater press against and flatten the dural sac that encloses the spinal cord and cerebrospinal fluid. This indentation...

For severe symptoms, danger signs, pregnancy, child illness, or sudden worsening, seek urgent medical care.

বাংলা রোগী নোট এখনো যোগ করা হয়নি। পোস্ট এডিটরে “RX Bangla Patient Mode” বক্স থেকে সহজ বাংলা সারাংশ যোগ করুন।

এই তথ্য শিক্ষা ও সচেতনতার জন্য। এটি ডাক্তারি পরীক্ষা, রোগ নির্ণয় বা প্রেসক্রিপশনের বিকল্প নয়।

Article Summary

Extradural thecal sac indentation, also known as thecal sac effacement or compression, is a radiological finding seen on MRI or CT scans when structures outside the dura mater press against and flatten the dural sac that encloses the spinal cord and cerebrospinal fluid. This indentation can be caused by many extradural processes—such as herniated discs, bony overgrowth (osteophytes), or epidural masses—that occupy space within the...

Key Takeaways

  • This article explains Anatomy of the Thecal Sac in simple medical language.
  • This article explains Types of Extradural Thecal Sac Indentation in simple medical language.
  • This article explains Causes in simple medical language.
  • This article explains Symptoms in simple medical language.
Educational health guideWritten for patient understanding and clinical awareness.
Reviewed content workflowUse writer and reviewer profiles for stronger trust.
Emergency safety firstUrgent warning signs are highlighted below.

Seek urgent medical care if you notice

These warning signs are general safety guidance. Local emergency numbers and clinical judgment should always come first.

  • New or worsening weakness, numbness, or loss of coordination.
  • Loss of bladder or bowel control, or numbness around the groin or saddle area.
  • Back or neck pain with fever, recent major injury, cancer history, or unexplained weight loss.
1

Emergency now

Use emergency care for severe, sudden, rapidly worsening, or life-threatening symptoms.

2

See a doctor

Book a professional medical evaluation if symptoms persist, worsen, recur often, affect daily activities, or occur in a high-risk patient.

3

Learn safely

Use this article to understand possible causes, tests, treatment options, prevention, and questions to ask your clinician.

Before reading

RX Patient Tools

Use these quick guides before reading the article, or return to them when you need help preparing questions for a doctor.

Start here Choose the right pathway for symptoms, reports, medicines, or urgent warning signs. Disease article roadmap Read this topic step by step: meaning, symptoms, warning signs, diagnosis, treatment, prevention, and follow-up. Treatment planner Prepare questions about treatment choices, benefits, risks, side effects, and follow-up. Family & caregiver guide Organize symptoms, reports, medicines, questions, and follow-up safely. Nutrition & diet guide Prepare food, hydration, supplement, and medicine-timing questions safely. Prevention guide Organize risk factors, protective habits, screening, and warning signs. Recovery guide Prepare a safe plan for activity, rehabilitation, warning signs, and follow-up.
Definition

Extradural thecal sac indentation, also known as thecal sac effacement or compression, is a radiological finding seen on MRI or CT scans when structures outside the dura mater press against and flatten the dural sac that encloses the spinal cord and cerebrospinal fluid. This indentation can be caused by many extradural processes—such as herniated discs, bony overgrowth (osteophytes), or epidural masses—that occupy space within the spinal canal and impinge on the thecal sac. Grading of indentation (mild, moderate, severe) depends on how much cerebrospinal fluid (CSF) around the spinal cord is obliterated:

  • Mild: < 25 % CSF obliteration

  • Moderate: 25 %–50 % CSF obliteration

  • Severe: > 50 % CSF obliteration Spine InfoSpine Info

Anatomy of the Thecal Sac

Structure and Location

The thecal sac is a single-layer dural membrane (meningeal layer of dura mater) forming a protective tubular sheath around the spinal cord and cauda equina. It begins at the foramen magnum at the skull base and extends downward to level S2 of the sacrum, where it tapers into the filum terminale. The space between the dura and vertebral canal walls—the epidural space—contains fat, blood vessels, and spinal nerve roots. PMC

Origin and Insertion

  • Origin: Fusion of meningeal and periosteal dura at the foramen magnum

  • Insertion: Ends at the second sacral vertebra (S2), blending into the filum terminale
    These anchoring points keep the spinal cord and CSF-filled sac aligned within the vertebral canal during movement. PMC

Blood Supply

The spinal dura mater (thecal sac) receives arterial blood primarily from anterior and posterior radicular arteries, which branch from segmental spinal arteries and anastomose around the dura. Venous drainage returns via the internal vertebral venous plexus into segmental veins. Radiopaedia

Nerve Supply

Sensory fibers from meningeal branches (sinuvertebral nerves) of each spinal nerve innervate the thecal sac. These recurrent nerves also supply the posterior longitudinal ligament and the walls of the epidural space, transmitting pain signals from dural irritation. Radiopaedia

Functions

  1. Protection: Forms a tough barrier shielding the spinal cord from mechanical injury and pathogen invasion.

  2. CSF Containment: Houses cerebrospinal fluid, providing buoyancy and cushioning against shocks.

  3. Homeostasis: Maintains optimal chemical environment for nerve roots and spinal cord by circulating CSF.

  4. Immune Barrier: Serves as an immunological interface, limiting spread of infection into the central nervous system.

  5. Stabilization: Anchors and centers the spinal cord in the vertebral canal during flexion and extension.

  6. Nutrient Exchange: Facilitates exchange of nutrients and waste between CSF and spinal cord vessels. Verywell Health

Types of Extradural Thecal Sac Indentation

  1. Focal Indentation: Localized flattening at a single spinal level, often from a focal disc protrusion.

  2. Diffuse Indentation: Widespread circumferential effacement, typically from multilevel spondylotic changes.

  3. Symmetric vs. Asymmetric: Symmetric when both sides of the sac are equally compressed; asymmetric when one side is more indented, causing lateral recess stenosis.

  4. Graded Indentation: Classified as mild (< 25 %), moderate (25 %–50 %), or severe (> 50 %) based on CSF space obliteration.

  5. By Etiology:

    • Degenerative: Osteophytes, facet hypertrophy, ligamentum flavum thickening

    • Disc‐Related: Bulge, protrusion, extrusion, sequestration PMCRadiopaedia

    • Epidural Fat: Lipomatosis causing global posterior indentation

    • Inflammatory/Infective: Abscess or granulomatous tissue

    • Neoplastic: Extradural tumors (metastases, meningioma extensions)

Causes

  1. Herniated intervertebral disc (protrusion, extrusion)

  2. Osteophyte formation from spondylosis

  3. Hypertrophy of ligamentum flavum

  4. Facet joint arthrosis and cysts

  5. Epidural lipomatosis (excess fat) RadiopaediaPMC

  6. Vertebral fracture retropulsion

  7. Synovial cysts in facet joints

  8. Spinal epidural abscess

  9. Spinal epidural hematoma

  10. Extradural metastatic tumors

  11. Primary bone tumors (e.g., chordoma)

  12. Tuberculous spondylitis (Pott’s disease)

  13. Epidural chronic injury or inflammation. সহজ বাংলা: অতিরিক্ত দাগের মতো টিস্যু তৈরি হওয়া।" data-rx-term="fibrosis" data-rx-definition="Fibrosis means excess scar-like tissue formation after chronic injury or inflammation. সহজ বাংলা: অতিরিক্ত দাগের মতো টিস্যু তৈরি হওয়া।">fibrosis (post-surgical scar)

  14. Rheumatoid pannus at C1–C2

  15. Spondylolisthesis with canal narrowing

  16. Paget’s disease of bone

  17. Desmoid tumors

  18. Calcified epidural cysts

  19. Anticoagulation-related bleeding

  20. Idiopathic intracanal fat deposition

Symptoms

  1. Localized back or neck pain

  2. Radicular pain (shooting down arms or legs)

  3. Numbness or tingling in limbs

  4. Muscle weakness in corresponding myotomes

  5. Neurogenic claudication (leg pain on walking)

  6. Reflex changes (hyperreflexia or hyporeflexia)

  7. Gait disturbances or ataxia

  8. Bowel or bladder dysfunction

  9. Sexual dysfunction

  10. Lhermitte’s sign (electric shock sensations)

  11. Spasticity of lower limbs

  12. Sensory level (dermatomal loss)

  13. Neck stiffness

  14. Upper motor neuron signs in cervical lesions

  15. Cold intolerance or dysesthesia

  16. Postural imbalance

  17. pain in the head or upper neck. সহজ বাংলা: মাথাব্যথা।" data-rx-term="headache" data-rx-definition="Headache means pain in the head or upper neck. সহজ বাংলা: মাথাব্যথা।">Headache worsening with posture (cervical region)

  18. Intracanal clonus

  19. Myelopathic hand signs (Hoffmann’s sign)

  20. In severe cases, partial paralysis PMC

Diagnostic Tests

  1. MRI (T1, T2, STIR): Gold standard for soft-tissue and CSF space visualization

  2. CT Scan: Detects bony overgrowth and calcifications

  3. CT Myelography: Alternative when MRI contraindicated

  4. Plain Radiographs (X-ray): Show spondylosis, alignment, fractures

  5. Dynamic (Flexion/Extension) X-rays: Assess instability

  6. Bone Scan: Identifies infection or tumor activity

  7. PET-CT: For metastatic disease evaluation

  8. Discography: Pain mapping in discogenic pain

  9. Electromyography (EMG): Evaluates nerve root function

  10. Nerve Conduction Studies (NCS): Quantifies peripheral nerve involvement

  11. Somatosensory Evoked Potentials (SSEP): Assesses dorsal column pathways

  12. Motor Evoked Potentials (MEP): Evaluates corticospinal tracts

  13. Ultrasound‐Guided Epidural Injection Test: Diagnostic and therapeutic

  14. Cerebrospinal Fluid Analysis (Lumbar Puncture): In suspected infection

  15. ESR/CRP: Inflammatory markers for infection/inflammation

  16. Complete Blood Count: Infection screening

  17. Serologic Tests: TB, rheumatoid factor

  18. Biopsy (CT‐guided): For unknown epidural masses

  19. Vascular Studies (Doppler): Exclude vascular etiologies

  20. Neuropsychological Testing: For chronic pain assessment PMC

Non-Pharmacological Treatments

  1. Physical therapy with core stabilization

  2. Stretching exercises (e.g., hamstring, hip flexor)

  3. Aquatic therapy (water-based exercises)

  4. Manual therapy (mobilization, massage)

  5. Traction therapy (mechanical or manual)

  6. Heat and cold application

  7. Transcutaneous electrical nerve stimulation (TENS)

  8. Spinal decompression therapy

  9. Chiropractic spinal manipulation

  10. Acupuncture and dry needling

  11. Postural education and ergonomic training

  12. Weight loss and nutritional counseling JPain

  13. Yoga and Tai Chi

  14. Pilates for spinal stability

  15. Cognitive-behavioral therapy for pain

  16. Biofeedback training

  17. Gait training with assistive devices

  18. Lumbosacral orthoses (back braces)

  19. Activity modification and pacing

  20. Self-management education

  21. Kinesio taping

  22. Neural mobilization techniques

  23. Ergonomic workstation setup

  24. Relaxation and breathing exercises

  25. Sleep hygiene optimization

  26. Smoking cessation support

  27. Aquatic buoyancy-assisted stretches

  28. Dry hydrotherapy (aqua-jets)

  29. Vestibular therapy (for balance)

  30. Mindfulness meditation

Drugs

  1. Acetaminophen (paracetamol)

  2. Ibuprofen (NSAID)

  3. Naproxen (NSAID)

  4. Diclofenac (NSAID)

  5. Meloxicam (NSAID)

  6. Celecoxib (COX-2 inhibitor)

  7. Tramadol (weak opioid)

  8. Codeine (opioid)

  9. Oxycodone (opioid)

  10. Morphine (opioid)

  11. Gabapentin (neuropathic pain)

  12. Pregabalin (neuropathic pain)

  13. Duloxetine (SNRI)

  14. Amitriptyline (TCA)

  15. Carbamazepine (anticonvulsant)

  16. Baclofen (muscle relaxant)

  17. Cyclobenzaprine (muscle relaxant)

  18. Tizanidine (muscle relaxant)

  19. Prednisone (oral corticosteroid)

  20. Methylprednisolone (injectable corticosteroid) Verywell Health

Surgeries

  1. Decompressive laminectomy

  2. Microdiscectomy

  3. Laminotomy (unicompartmental decompression)

  4. Posterior lumbar interbody fusion (PLIF)

  5. Transforaminal lumbar interbody fusion (TLIF)

  6. Anterior cervical discectomy and fusion (ACDF)

  7. Foraminotomy

  8. Endoscopic decompression

  9. Kyphoplasty/vertebroplasty (for compression fractures)

  10. Minimally invasive tubular decompression PMC

Prevention Strategies

  1. Maintain healthy body weight

  2. Regular core and back strengthening exercises

  3. Practice good posture (standing, sitting, lifting)

  4. Ergonomic workstation setup

  5. Avoid heavy lifting or twisting without support

  6. Quit smoking to improve disc health

  7. Balanced diet rich in calcium and vitamin D

  8. Stay active with low-impact cardio (walking, swimming)

  9. Use proper body mechanics in daily activities

  10. Early treatment of minor back injuries Verywell Health

When to See a Doctor

  • Sudden or severe back/neck pain with weakness or numbness in legs or arms

  • Loss of bowel or bladder control (cauda equina sign)

  • Progressive neurological deficits (e.g., worsening gait disturbance)

  • Unremitting pain unrelieved by rest or medications

  • Fever, weight loss, or signs of infection with back pain

  • History of cancer with new back pain

  • Any sudden change in chronic spinal symptoms Spine Info

Frequently Asked Questions

  1. What exactly is extradural thecal sac indentation?
    It’s when something outside the dura mater presses inward on the dural sac, flattening its normally rounded shape and reducing the CSF space around the spinal cord.

  2. Does thecal sac indentation always cause symptoms?
    No. Mild indentation may be an incidental finding on MRI and not produce any pain or neurological signs.

  3. How is the degree of indentation measured?
    Radiologists grade indentation by the percentage of CSF space obliteration on axial MRI slices: mild (< 25 %), moderate (25 %–50 %), or severe (> 50 %).

  4. Can extradural thecal sac indentation resolve on its own?
    Yes. If caused by a reversible process (e.g., mild disc bulge) and treated conservatively, indentation may improve over weeks to months.

  5. What imaging test is best for diagnosing thecal sac compression?
    MRI is the gold standard because it clearly shows soft tissues, CSF, spinal cord, and indenting lesions.

  6. Are there any non-surgical options to relieve indentation?
    Yes—physical therapy, exercise, weight loss, posture correction, and targeted manual therapies can reduce pressure on the thecal sac.

  7. When is surgery necessary?
    Surgery is considered when severe indentation causes neurological deficits, intractable pain, or threatens permanent nerve damage.

  8. What are the risks of surgery?
    Potential risks include infection, bleeding, nerve injury, instability requiring fusion, and scar tissue formation.

  9. Can epidural steroid injections help?
    Yes. Injections of corticosteroids into the epidural space can reduce inflammation and relieve pain, but effects may be temporary.

  10. How long is recovery after decompression surgery?
    Most patients recover mobility within 4–6 weeks, but full functional recovery can take 3–6 months with rehabilitation.

  11. What lifestyle changes prevent recurrence?
    Maintaining a strong core, healthy weight, proper posture, and avoiding heavy lifting help prevent further spinal canal narrowing.

  12. Is thecal sac indentation the same as spinal stenosis?
    Indentation is a radiological sign of compression, whereas stenosis refers to any narrowing of the spinal canal, which may or may not indent the thecal sac.

  13. How does obesity contribute to indentation?
    Excess body fat, especially in the epidural space (lipomatosis), can push on the thecal sac and narrow the canal.

  14. Can alternative therapies help?
    Techniques like acupuncture, yoga, Tai Chi, and mindfulness may complement medical treatments but should not replace conventional care for severe cases.

  15. What is the long-term outlook?
    With appropriate management—conservative or surgical—most people experience significant symptom relief and improved function, although ongoing preventive care is important.

Disclaimer: Each person’s journey is unique, treatment plan, life style, food habit, hormonal condition, immune system, chronic disease condition, geological location, weather and previous medical  history is also unique. So always seek the best advice from a qualified medical professional or health care provider before trying any treatments to ensure to find out the best plan for you. This guide is for general information and educational purposes only. Regular check-ups and awareness can help to manage and prevent complications associated with these diseases conditions. If you or someone are suffering from this disease condition bookmark this website or share with someone who might find it useful! Boost your knowledge and stay ahead in your health journey. We always try to ensure that the content is regularly updated to reflect the latest medical research and treatment options. Thank you for giving your valuable time to read the article.

The article is written by Team Rxharun and reviewed by the Rx Editorial Board Members

Last Updated: May 03, 2025.

Doctor visit helper

Prepare before seeing a doctor

A simple rural-patient checklist to help you explain symptoms clearly, ask better questions, and avoid unsafe self-treatment.

Safety note: This is not a prescription or diagnosis. For severe symptoms, pregnancy danger signs, children with serious illness, chest pain, breathing difficulty, stroke-like weakness, or major injury, seek urgent care.

Which doctor may help?

Orthopedic doctor, spine specialist, neurologist, or physiotherapist depending on severity.

What to tell the doctor

  • Mark pain area and whether pain travels to leg.
  • Write numbness, weakness, bladder/bowel problem, fever, injury, or night pain if present.
  • Bring previous X-ray/MRI and medicine list.

Questions to ask

  • Is this muscle pain, disc problem, nerve pressure, arthritis, infection, or another cause?
  • Do I need X-ray or MRI now?
  • Which activities should I avoid and which exercises are safe?
  • When can I return to work?

Tests to discuss

  • Spine and neurological examination
  • Straight leg raise or similar nerve tension tests
  • X-ray if trauma/deformity/chronic pain is suspected
  • MRI if leg weakness, sciatica, or red flags are present

Avoid these mistakes

  • Avoid heavy lifting, long bed rest, and untrained spinal manipulation.
  • Avoid NSAIDs if ulcer, kidney disease, blood thinner use, pregnancy, or allergy unless doctor says safe.

Medicine safety and first-aid guide

This section is for patient education only. It does not replace a doctor, pharmacist, or emergency care.

Safe first steps

  • Avoid heavy lifting, sudden bending, and prolonged bed rest.
  • Use comfortable posture and gentle movement as tolerated.
  • Discuss physiotherapy, X-ray, or MRI only when clinically needed.

OTC medicine safety

  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
  • Avoid repeated painkiller use if you have kidney disease, stomach ulcer, uncontrolled blood pressure, or are taking blood thinners.

Avoid these mistakes

  • Do not start antibiotics without a proper medical decision.
  • Do not use steroid tablets or injections casually for quick relief.
  • Do not delay emergency care because of home remedies.

Get urgent help if

  • Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

For rural patients and family caregivers

Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Orthopedic / spine specialist, physical medicine doctor, or qualified clinician
Tests to discuss with doctor
  • Neurological examination for leg power, sensation, reflexes, and straight leg raise
  • X-ray only if injury, deformity, long-lasting pain, or doctor suspects bone problem
  • MRI discussion if severe nerve symptoms, weakness, bladder/bowel problem, or persistent symptoms
Questions to ask
  • What is the most likely cause of my symptoms?
  • Which warning signs mean I should go to emergency care?
  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?
  • Is physiotherapy, posture correction, or activity modification needed?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Care roadmap for: Extradural Thecal Sac Indentation

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.

RX Patient Help

Ask a health question safely

Write your symptom story. A health professional or site editor can review it before any answer is prepared. This box is not for emergency care.

Emergency first: Severe chest pain, breathing trouble, unconsciousness, stroke signs, severe injury, heavy bleeding, or rapidly worsening symptoms need urgent local medical care now.

Frequently Asked Questions

Is this article a replacement for a doctor?

No. It is educational content only. Patients should consult a qualified clinician for diagnosis and treatment.

When should I seek urgent care?

Seek urgent care for severe symptoms, rapidly worsening condition, breathing difficulty, severe pain, neurological changes, or any emergency warning sign.

References

Add references, clinical guidelines, textbooks, journal articles, or trusted medical sources here. You can edit this area from the RX Article Professional Blocks panel.

More from this topic
  1. Undescended Shoulder Disease

    DefinitionUndescended shoulder disease is not the usual medical name. Doctors usually call this condition Sprengel deformity, Sprengel shoulder, congenital? high scapula, or congenital? elevation of the...

    April 3, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  2. Sprengel Deformity

    DefinitionSprengel deformity is a birth condition in which one shoulder blade, called the scapula, stays higher than normal because it does not move down to its...

    April 2, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  3. High Shoulder Blade

    DefinitionA high shoulder blade usually means one shoulder blade sits higher than normal from birth. The medical name is Sprengel deformity or congenital? high scapula. “Scapula”...

    April 2, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  4. High Scapula

    DefinitionHigh scapula is a condition where one shoulder blade sits higher than normal on the back from birth. Doctors usually call it Sprengel deformity, congenital? high...

    April 2, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  5. Upward Displacement of the Scapula

    DefinitionUpward displacement of the scapula usually means congenital? elevation of the scapula, which is most often called Sprengel deformity or Sprengel shoulder. In this condition, one...

    April 2, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  6. Congenital Elevation of Scapula

    DefinitionCongenital? elevation of scapula means a baby is born with one shoulder blade sitting higher than normal. The shoulder blade is called the scapula. In this...

    April 2, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  7. Congenital Radial Head Dislocation

    DefinitionCongenital? radial head dislocation means the top part of the radius bone, called the radial head, is out of its normal place at the elbow from...

    April 2, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  8. Congenital Elbow Dislocation

    DefinitionCongenital? elbow dislocation usually means a baby is born with abnormal alignment around the elbow joint, most often a congenital? radial head dislocation. It is rare,...

    April 2, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  9. Congenital Bowing of Long Bones

    DefinitionCongenital? bowing of long bones means a baby is born with one or more arm or leg bones that curve more than usual. It is not...

    March 12, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)
  10. Humero-Radio-Ulnar Intercalary Transverse Meromelia

    DefinitionHumero-radio-ulnar intercalary transverse meromelia is a rare birth defect of the arm. In this condition the upper arm bone (humerus) and the two forearm bones (radius...

    March 5, 2026 • Degenerative Bones, Joints, and Spine Care (A - Z)