Avascular Necrosis of the Hip Joint

Bones in our body are living tissues which require a blood supply to nourish and keep them healthy.

Avascular necrosis of the hip is a condition resulting from the disruption of vital blood supply. No blood supply(avascular) leads to bone death called necrosis.

The condition is also known as osteonecrosis, aseptic necrosis or ischaemic necrosis.

Here at Complete Orthopedics, we are specialists in treating Avascular Necrosis.

I’m Dr. Nakul Karkare, and I hope you’ll take a minute to watch this video…

Anatomy of the Hip Joint

Hip joint is a large weight bearing ball and socket joint. The ball is formed by the upper part of the thigh bone (femur) which fits into a socket formed by the acetabulum, which is part of the large pelvic bone.

The ball and the socket are covered by a smooth glistening white tissue known as cartilage. It helps in the smooth gliding of the ball in various movements about the joint such as walking, running,squatting, sitting cross legged.

Our own Dr. Karkare was on a recent WCBS 12 segment about Avascular Necrosis with Dr. Max Gomez:

Stages of Avascular Necrosis

Blood supply is vital to maintain the normal surface and structure of the joint. Any cause leading to decreased or absent blood supply leads to small islands of dead bone. Normally any area of dead bone is removed by the body and new bone is laid down to replace it.

X-ray showing avascular necrosis (AVN) of the hip

X-ray showing avascular necrosis (AVN) of the hip

With an absent blood supply, a segment of bone is necrosed.

The surrounding bone with blood supply tries to revascularize the dead bone.

Vascular tissue lays down new bone in the area which increases the density (visible as increased whiteness in an X ray.)

A small fracture or break develops between the new bone and the dead bone.

The space in between the break is filled by a scar tissue.

Overlying cartilage without nourishment softens and decays. The weight bore on the joint leads to small dents or breaks in the cartilage leading to collapse.

The smooth gliding is now lost and the ball grinds with the socket in the area. The process becomes widespread leading to severe arthritis and destruction of the joint surface.

Causes & People at Risk

  • Trauma: Injuries including fractures and dislocations(such as ball coming out of the socket) of the hip joint can compromise the vital blood supply leading to avascular necrosis. Any age group can be involved and the disease process is limited to the joint affected by trauma
  • Alcoholism : Alcohol intake over the years causes direct toxicity to the bone cells and their blood supply. Certain drugs are also toxic to the bone cells. The result is areas of dead bone with collapse of the cartilage.
  • Steroid abuse : Long term steroid use causes blockage to the blood supply in the hip. The reasons are unknown but one hypothesis is that increased fat globules in the blood which get lodged in the vessels. Commonly affecting patients on long term steroid therapy(transplant patients, kidney disease etc) and bodybuilders/athletes abusing steroids.
  • Blood disorders : Patients with diseases causing thickening of blood are at risk due to increased chances of blood clot lodging in the vessels.
  • Chronic liver disease : Hyperlipidemia or increased lipids in the blood cause fat globules to lodge and block the blood supply
  • Others : Certain congenital(born with) diseases like Gauchers, sickle cell disease are at risk. Deep sea divers develop divers disease or the bends which makes them prone to develop avascular necrosis
  • Unknown : Certain people develop it without any obvious cause most commonly affecting men in the 30’s to the 50’s of life. Eventually the other hip gets involved in 75% of the patients. When occurring in young adults or in the 20’s the disease is known as osteochondritis dissecans
  • Surgeries around the hip : Often surgeries which are done to fix hip fractures, hip dislocations or to correct birth defects in the hip joint lead to damage to the blood supply.


  • Hip Pain & stiffness: The starting complaints are usually mild to moderate pain in the groin or buttocks which may seem to go down to the thigh or even the knee. Stiffness around the hip develops and is associated with increased pain as the patient tries to move.
  • Limp : Patient tries not to bear weight on the affected limb owing to increased pain and stiffness. As a result the patient walks with a limp which is usually noticed by the patient’s family or friends.
  • Restriction of movements : Certain movements such as one required to tie shoelaces may be the first to be limited. With advanced disease all the movements are gradually lost and the hip joint is fixed in one position.
  • Loss of Activities of daily living : As a result of the symptoms the patient finds it extremely difficult to perform day to day activities such as walking, sitting, squatting, climbing stairs or participation in recreational sports activities


The disease process of avascular necrosis starts long before the symptoms appear, usually months to years. So early diagnosis of avascular necrosis becomes important to start early treatment. Unfortunately, most patients report when the disease is already in advanced stages with complete destruction of the joint. The attending doctor will usually perform the following

  • History : A detailed account of the preceding events and symptoms such as pain, stiffness and restriction of motion. Patient’s day to day activities, requirements and the past medical history
  • Physical examination and tests: Attending doctor will perform a detailed physical examination including tests to see the movements of the hip which are restricted. A detailed examination of the other hip and joints.
  • Blood tests: A complete blood profile and special blood investigations
  • Radiograph : An X-ray of both the hips is done. Other than ruling out fractures an x ray usually details about the joint collapse, osteoarthritic changes, areas of bone destruction and new bone formation. Radiographs are best to detect changes when the disease has already advanced.
  • MRI : It offers early detection even before the symptoms appear. Entailing the details of the tissues forming and surrounding the joint. Cartilage destruction, bone marrow and segments involved are easily detected.
MRI showing AVN hip

MRI showing AVN hip

Any infections or edema(swelling) in the joint is also visualized. Any changes in the other hip which might get involved in the future can be detected.

  • Bone scan : A small amount of radioactive dye is injected which gets accumulated in the areas of excessive destruction or repair. The dye is visualised using special imaging scanners. It offers the earliest detection of disease process of osteonecrosis


Early stages of disease are relatively pain free. The patient usually presents to the physician in the late stages with advanced collapse. Although if detected in early stages medical treatment can be helpful.

Non surgical treatment

Drug therapy includes use

  • Lipid lowering drugs : These drugs are useful in people with high blood lipids/cholesterol
  • Nonsteroidal anti-inflammatory medications : They provide symptomatic relief of pain and helpful to control the swelling in the joint. Although symptomatic they provide good relief in pursuing day to day activities. The disease process is not stopped.
  • Anti-osteoporotic drugs :  Drugs such as alendronate help to decrease bone loss and pain associated with it.
  • Blood thinners : Drugs like warfarin are also used to prevent clots blocking the blood vessels.
  • Physical therapy and precautions :  Avoiding weight bearing on the affected limb slows down the collapse and physical therapy helps to maintain active range of motion.

Regardless, despite the medical treatment, the disease progresses in the majority of patients requiring surgical interventions.

Surgical management

Surgical interventions depend on the patients age, the segment of bone affected and the stage of the disease. Some of the various interventions are:

  • Core decompression

Multiple drills are done in the hip bone to reduce the pressure inside and potentially allowing the bone forming cells to lay down new bone replacing dead bone. The reduced pressure allows for increased blood supply to the bone. The procedure is helpful when performed before the collapse of bone and cartilage.

  • Vascularised and non-vascularized grafts

An attempt is made to reestablish the blood supply of the hip bone by inserting a bone graft taken from another part of the body. Usually a part of fibula bone(one of the two leg bones) along with its blood vessel is used as a graft. The grafted bone incorporates into the hip bone and with its blood supply helps in revascularization.

The grafts can also be non vascularized(without a blood vessel). Grafted bone not only provides structural support but also supplies potential bone forming cells which creep in substituting the dead bone. Muscle pedicle grafts can also be used. Again the procedure is helpful only if performed in early stages of the disease process.

  • Osteotomies

These are surgeries which change the segments of the ball of the hip which bear weight. The diseased segment is surgically rotated so that the healthy segment comes to lie under the weight bearing portion and relieves the pain and stiffness. The diseased unloaded segment potentially starts to get healthy. The surgery is useful in smaller lesions.

  • Total hip replacement/Hip resurfacing

Majority of patient report to the physicians when in pain and the disease process is already in advanced stages.

Total hip replacement is the best surgical option which not only relieves pain and stiffness but offers a faster rehabilitation usually 8 weeks. The patient rapidly goes back into his daily activities as before the disease. It involves replacing the hip joint with a prosthetic/artificial joint which recreates the movements and biomechanics of the normal joint. It offers a normal lifestyle even in advanced stages.

Metallic Acetabular shell

The acetabular shell is usually made of cobalt chromium alloy and consists of an outer porous coating. The porous allows the bone ingrowth into the surface as the prepared surface of the acetabulum heals. The acetabular shell contains holes for screw fixation. The screw holes are covered using screw plugs. The circumferential grooves help to firmly fix the acetabular liner in the shell.

Acetabular liner

The acetabular liner is made of a specialized plastic known as highly cross linked polyethylene. The polyethylene is processed so provide a smooth surface for the head of the femur to moves in the cavity while decreasing the wear and tear of the implant.

Ceramic prosthetic head of femur

The head of femur is replaced by a prosthetic head that may be made of cobalt chromium alloy or ceramic. The head is designed in a way to provide maximum smoothness on the surface to decrease friction. The surgeon plans to use the maximum diameter of the head according to the patient anatomy to prevent dislocation.


Wedge tapered prosthetic femoral stem

The prosthetic femoral stem is inserted in the upper part of the femoral canal. The stem is usually press-fitted in the femoral canal. The upper part of the prosthesis consists of a porous coating that helps bone ingrowth for firm fixation. The lower end is tapered for smooth insertion of the stem. The stem used for primary hip replacement is shaped for maximum bone preservation and to transfer the load distally.

November 29th is celebrated as Avascular Necrosis (AVN) Awareness day!

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Based on 107 reviews
Dr. Nakul Karkare is awesome! And patriotic! Thank you, Dr. Karkare for displaying the American Flag in your waiting room, honoring and mourning our military personnel, this Memorial Day, who died while serving in the United States Armed Forces.
00:52 30 May 23
Excellent and skilled orthopedic practice specializing in joint replacements. Dr Karkare was trained at the Hospital for Special Surgery and has excellent results, as do his associates!! Would gladly refer family members to the practice!!
00:24 30 May 23
I had such a wonderful experience with Complete Orthopedics in Stony Brook. Not only did Dr. Kuo fix my broken wrist with such kindness and care, but the office staff, including Billing, Reception and the X-Ray Technician, was always so helpful, going out of their way to ensure that each patient felt welcome, answering any questions with a smile, and ensuring any issues with insurance/billing were handled with the utmost professionalism. I highly recommend their practice!
Victoria DeMatteo
19:49 10 May 23
I'm very happy St. Catherine's sent me to this office for treatment after I broke my collar bone! Unfortunately the break was too severe to repair on its own and I had to have it rebuilt a week after the injury. Dr. Vaksha did a great job fixing it. I'm three months out, and I have full use of the arm and shoulder. The whole office staff is very professional, accommodating, and welcoming. I hope to not need orthopedic services again, but Dr. Vaksha will be my number one choice if I or anyone in family suffers such am injury.
Tina Rivera
20:42 08 May 23
No one likes going to the doctor. But these people make it painless. I go for knees, hips and shoulders. At almost 70 Complete Orthopedics keeps my active life style running smoothly. Whether chasing my Grandson and even surfing again, I highly recommend them!!
Thomas Slavin
15:02 02 Mar 23
Dr. Kuo knowledgeable and competent surgeon- very good experience and more importantly great result.
Joseph McCoy
21:23 25 Feb 23
Dr Vaksha was so kind and helpful. He took extra time with us and explained things so thoroughly. Highly recommend. Office very clean.
Susan Bosinius
20:20 19 Feb 23
Dr Vaksha, is a great doctor very professional knows what he talking about. Treat patient with upmost respect. Thank You
Troy Spencer
16:46 19 Jan 23
Dr. Karkare is an amazing doctor, very caring and attentive, the girl at the front desk is very kind and helpful. .elizabeth .thank you so much .
blanca ventura
21:32 26 Oct 22
Been going to this place before my accident and after I had my knee surgery. So happy how I been treated and how well I am getting. Thank you all and specially Dr. VAKSHA for everything and getting back on track.
Ita Opico
19:01 25 Oct 22
Love this place From the minute I called I was treated kindly. When I arrived The Dr saw me right away he was compassionate and ordered the appropriate tests for me. I came back in for my follow up and had the same great experience.
Christine Rostock
21:28 23 May 22
Dr Vaksha and Dr karkare are 2 of the best orthopedic doctors around my wife Susan had a very serious broken ankle in March of 2019 she didn't think she was going to walk again Dr vaksha did an excellent surgery on her ankle he said it was his toughest he ever did he put a lot of hardware in her ankle and told her she would be alright she made remarkable recovery thanks to his surgery as of now she regained 100 percent use of her ankle she would highly recommend him to anyone. My own experience with Dr karkare has been wonderful he takes his time with you listens to what you have to say and prescribes various treatments and is very caring I would highly recommend him to anyone I would give both doctors a 10 plus rating we are very happy with them the best.
Harry Jones
23:31 19 May 22
Complete orthopedics is a wonderful place to go when you hurt or injured a great staff and wonderful doctors very knowledgeable and helpful I would recommend this place to all of my family and friends that is in me of orthopedic care I give them 10 thumbs up
Wayne Pemberton
17:39 18 May 22
The staff is very professional and helpful. Dr. Vaksha is excellent. He takes time to listen and offer suggestions to help you get better. I’m very thankful and happy to be a patient here at Complete Orthopedics.
Phoenix Rising
19:54 16 May 22
Dr.Karkare is the best. He listens to everything and explains everything I recommend him to everyone. I am so happy he is my doctor.
Myrna James
00:48 13 May 22
Dr.Kuo is amazing very attentive,caring,and passionate and staff is awsome too.Thank you for everything Dr.kuo.
Erick Murillo
23:17 12 May 22
I was in a car accident November 1 I was referred to Dr. Vaksha For shoulder surgery . I he was amazing he made me feel very comfortable and explained everything that was going to happen from surgery all the way through my physical therapy highly recommend Dr. Vaksha
Yolanda Ojeda
19:37 09 May 22
My appointment with Dr. Vaksha was amazing. Dr. Vaksha was very thorough and kind. I would refer this office to anyone who needs a great orthopedic doctor.
John Senechal
19:54 05 May 22
Scheduling my appointment was quick and easy. The staff was super friendly and down to earth. I was seen on time. The appropriate test, “x-rays” were taken before the conversation with doctor, something I really liked, test for analysis and conversation was done upfront. Dr. V had a great personality and was no BS, straight forward diagnosis and a play on next steps. I am happy I found them and would refer them to friends and family.
00:46 03 May 22
I have seen Dr. Kuo two times already and he's awesome along with his staff. Very friendly office and I'm glad to be a patient here.
Camaris A
20:01 28 Apr 22
Amazing team!! Very caring, profesional, and friendly!! Dr. Kevin Kuo, you are the best, very passionate, caring, and helping thank you for getting me better and being so kind to me! Elizabeth you the best thank you for you help always and you big smile and positive actitud❤️🙏🏼
breidy valerio
19:01 22 Apr 22
The staff is truly exceptional, they make you feel comfortable and welcomed. The doctors are amazing,always professional, compassionate and great listeners.
Elizabeth Collado
03:25 09 Apr 22
What a great place! The place is clean and organized.The staff is wonderful. Setting up physical therapy is right there as well.I'm so glad I found this place.
Donna Anne
22:45 05 Apr 22
This was my 1st time breaking something in my 27 years on this planet. I was recommended here by a friend Dr. Vashka helped me from day 1 and still continues to check in on me and my healing ankle. Would highly recommend
tyron davis
16:06 01 Apr 22
Brand new office, same great doctors! Rooms are clean, plenty of parking, physical therapy attached, Dr. Karkare and his staff are awesome. Thank you!
Emily B
02:49 24 Mar 22
Dr.VAksha is the best, I love the way he treats me as his patient, he is caring,understanding and very attentive to my needs
Mirna Caballero
14:53 03 Mar 22
Great staff. Dr. Vaksha is awesome and takes the time to listen to his patients. He is very compassionate. I would highly recommend this office.
Bebe Doyle
01:24 23 Feb 22
After suffering from a severe ankle injury Dr. V was able to help me heal and return back to work completely to a job where I stand for 12 hours a day. The office is very clean and I appreciated the reminders of my appointments via phone call and through text. The patient portal made it easy for me to access all my documents including work notes. The office staff is wonderful and Rebecca was able to schedule me with a busy schedule and awesome at answering all of my questions including referring me to a great physical therapy office. I highly recommend this office to anyone who’s looking for knowledgeable and kind orthopedic office.
Elizabeth Birchwell
21:31 28 Jan 21
The staff here are great, I was seen at the time of my appointment and was well taken care of!
Shaun Berry
18:14 07 Jan 21
They are an excellent practice. The front and back office people are amazing and so helpful. Rebecca is such a kind and understanding person. I had an issue with paperwork and she cleared it right up. Dr. Karkare is very knowledgeable, helpful, and caring.
Matt S.
19:31 18 Nov 20
Rebecca K. - What a true burst of sunshine. Very friendly and definitely an asset to the practice!
Laura Aston
18:17 17 Nov 20
Great experience, the Doctor is nice but the staff is incredible. I worked with Linda, who was profession and assisted me beyond what any person has done at other practices. Complete Ortho should be complimented for having such a person on their staff.I highly recommend this place!!!
Joe Allen
17:26 17 Nov 20
Linda and Becca they are so good ever time I come they are very nice I would tell everyone I no to come to this office..
Barbara Victor
16:45 17 Nov 20
I was rear ended in an auto accident , Dr Vashka was recommended by a friend of mine .I was experiencing Back , neck , and shoulder pain . After a thorough examination and given exercises to do at home , I am feeling much better , and I ended up avoiding surgery . The staff at Complete Ortho is extremely attentive and show great care when making an appointment and are very friendly and i never waited more than 5 minutes for my appointment . So I would strongly recommend Complete Orthopedics for any aches and pains that one might be experiencing.....
Bill Becht
04:44 17 Nov 20
It was the afternoon of Friday Sept. 24. We were in Pt. Jefferson and my wife, Mary Ann, broke her hip. We went to Mather Hospital and it was determined that she would have to have an operation to have it repaired. This would be her third time under the knife in the past year. It just so happened that we were very fortunate enough to have Dr. Karkare, who was on standby, perform the surgery. He put in a rod and two screws in her hip. She spent a few days in the hospital and then went to Gurwin rehabilitee for another few weeks.It has now been almost six weeks and we both worked the election the other day. If it wasn’t for Dr. Karkare’s expertise she never would have been able to work. She is able to walk with a walker and is doing physical therapy three times a week.We can not thank the doctor enough for the compassion and dedication that he puts into his work. It allows Mary Ann do the things that she likes to do, even on a limited basis for a while. I know that with her will, perseverance and the great work that the surgeon performed she will be back on her feet in no time.Sincerely:John V. PlumpEast Northport, NY 11731
Jack Harris
14:36 06 Nov 20
In the year of 2018 I was referred to Dr. Karkare because I was experiencing severe knee joint pain. After exhausting physical therapy and trying to labor through the pain, I had to make a quality of life decision. Total knee replacement was the only viable option. Dr. Karkare made my decision easy as he walked me through the whole process from surgery to recovery.On 12/13/19 ( Friday the 13th) I enter Lenox Hill Hospital in great hands. From the time I entered Dr. Karkare’s office for the first time until now, his staff has been amazing. Andrea the medical coordinator walked me through all the paper work and necessary preparations for the surgery. Courtesy and kind would be an understatement. Dr. Karkare went over and beyond from the wellness checks and phone calls all to assure me that I was important to him. This was the right decision no pain and no limp. Complete Orthopedics should be your choice!
Kenneth Randolph
22:18 25 Sep 20
Dr. Vadshka has a great bedside manner. He really takes his time and explains treatment options.
T Lee
12:33 09 Sep 20
I suffered with pain in both knees for years. My orthopedic doctor kept recommending knee replacement . I fought it for years, as I was just afraid. When I had no choice and could barely walk , it was recommended I see Dr. Karkare. We set up a consultation and my wife and I left his office feeling totally confident and comfortable with moving ahead with the surgery. He explained everything to us, and the office staff set everything up for us and made the process easy. So about one month after our initial meeting I had the first knee done. I was up walking mere hours after the surgery, and on the workout machines the next morning. I went home two days after the surgery, and yes walked my daughter down the aisle at her wedding only one week after the surgery without even a cane! Three months later I had the other knee done and went home the very next day. Dr. Karkare put my fears to rest . I would highly recommend him. His expertise gave me my life back. Thank you Dr. Karkare.SincerelyVito Congro
Ethel Congo
23:58 12 Aug 20
Dr Rhodin really cares for his patients. When I see him he makes sure to review my progress in detail.
Micki Cahill
15:03 08 Feb 20
My mom had a total hip replacement by dr karkare. He is the BEST orthopedic doctor.Her incision is almost invisable.She is going back for her other hip next week. The office staff is the best, love Andrea.You wont find a better doctor.
Ryan Brigandi
21:06 13 Jul 18
There is no better Orthopedic doctor you will find. Broke my ankle three places on a Saturday. Called Dr. Karkare. He had is team ready at the hospital and operated on me within 6 hours after my injury. Now After 3 months of great care by him and his staff, I am walking to normalcy.
Spacecom Tel
04:13 23 Mar 18

I am fellowship trained in joint replacement surgery, metabolic bone disorders, sports medicine and trauma. I specialize in total hip and knee replacements, and I have personally written most of the content on this page.

You can see my full CV at my profile page.

My name is Dr. Suhirad Khokhar, and am an orthopaedic surgeon. I completed my MBBS (Bachelor of Medicine & Bachelor of Surgery) at Govt. Medical College, Patiala, India.

I specialize in musculoskeletal disorders and their management, and have personally approved of and written this content.

My profile page has all of my educational information, work experience, and all the pages on this site that I've contributed to.