Avascular Necrosis of Bones | Ortho Study Notes

Avascular Necrosis of in Hip and other special Bones is the most common term the medical student should know. It is mostly to be known by the orthopedic Postgraduate students and the orthopedic Resistant.

What is Avascular Necrosis?

Avascular Necrosis is the death of the bone tissue due to the death of the bone due to compromise of the blood supply to the bone tissue.

This  AVN is characterized by the death of cellular components of the bone secondary to an interruption of the subchondral blood supply and can occur to every bone in our body. it can be from the small bone to the largest bone as we know that bone tissue is live tissue. without the blood supply, the bone tissue cannot get the oxygen and nutrients which later become dead.

Avascular Necrosis of Bones Ortho Study Notes
Avascular Necrosis of Bones Ortho Study Notes

This necrosis of bone typically affects the epiphysis of long bones at weight-bearing joints. The most common is “Avascular Necrosis in Hip” too. When it is progressive it may result in the subchondral collapse in the joints especially.

Causes of Avascular necrosis of bone

Avascular necrosis of bone can be due to traumatic as well as non-traumatic causes. Non-traumatic cases will typically present with mechanical pain and severity and it’s if is often difficult to localize.

In the early phase of the disease, the physical examination is often normal which inevitably causes a delay in diagnosis.

Avascular Necrosis of Bones has termed different names according to the bone. These terms are important not only for the medical students it’s also equally important for the medical students to appear for the postgraduate or master level entrance examination.

  • Traumatic causes of  Avascular Necrosis of Bones

    • like dislocation of Joint,
    • fracture of bone avascular necrosis of bone
  • Non-traumatic causes of Avascular Necrosis of Bones

    • like the consumption of alcohol and the use of medications like steroid abuse.
    • Radiotherapy can also cause blood vessel compromise leading to Avascular Necrosis of the Bones
    •  Obesity is also related to hyperlipidemia and may cause  Avascular Necrosis which is positively associated with BMI.
    • medical condition, such as sickle cell anemia or Systemic Lupus Erythematosus.

These notes are for especially postgraduate medical entrance examinations, and medical license examinations like the NMCLE exam, AIIMS exam, USMLE Exam, PLAB Exam Australia Medical Exam, and so on.

 

Avascular Necrosis of Bones | Ortho Study Notes

  • Ahlback disease – medial femoral condyle = SONK
  • Brailsford disease – head of the radius
  • Buchman disease – iliac crest
  • Burns disease – distal ulna
  • Caffey disease – entire carpus or intercondylar spines of the tibia
  • Dias disease – trochlear of the talus
  • Dietrich disease – head of metacarpals
  • Freiberg infraction – head of the second metatarsal
  • Friedrich disease – medial clavicle
  • Hass disease – humeral head
  • Iselin disease – the base of the 5th metatarsal
  • Kienbock disease – lunate
  • Kohler disease – patella or navicular (children)
  • Kummel disease – vertebral body
  • Legg-Calvé-Perthes disease – femoral head
  • Liffert-Arkin disease – the distal tibia
  • Mandi disease – greater trochanter
  • Mauclaire’s disease – metacarpal heads
  • Milch disease – ischial apophysis
  • Mueller-Weiss disease – navicular (adult)
  • Panner disease – capitulum of the humerus
  • Pierson disease – symphysis pubis
  • Preiser disease – scaphoid
  • Sever disease – calcaneal epiphysis
  • Thiemann disease – the base of phalanges
  • Van Neck-Odelberg disease – ischiopubic synchondrosis

 

Some Key Points about Avascular Necrosis of Bone

  • Avascular necrosis is a disease that results from the temporary or permanent loss of blood supply to the bone.
  • Avascular necrosis often happens most commonly at the ends of a long bone.
  • Avascular necrosis may be the result of injury and trauma and non-trauma
  • Early symptoms may not be seen but the Symptoms include joint pain and limited range of motion.
  • If avascular necrosis happens near a joint, the joint surface may collapse especially in Avascular Necrosis of the Hip. 

 

Leave a Comment