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Avascular Necrosis

Editor: David Stitson Updated: 8/28/2023 10:15:13 PM


Osteonecrosis is a degenerative bone condition characterized by the death of cellular components of the bone secondary to an interruption of the subchondral blood supply.[1] It is also known as avascular necrosis, aseptic necrosis, and ischemic bone necrosis. It typically affects the epiphysis of long bones at weight-bearing joints. Severe cases can lead to the destruction of subchondral bone or the collapse of an entire joint.[1]

The most common sites for AVN are the femoral head, knee, talus, and humeral head. The hip is the most common location overall.[2] AVN less commonly occurs in other bones of the body, such as the carpus and jaw.[3][4] Therefore, early recognition and treatment of osteonecrosis are essential.[2] This activity discusses the etiology and pathogenesis of the disease. Additionally, it includes the presentation and treatment options of the most common forms of osteonecrosis. 


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The widely accepted view in the literature is that a reduction in subchondral blood supply is responsible for osteonecrosis. However, numerous risk factors and theories exist on the development of this vascular impairment. Shah et al. succinctly categorize these into six groups.[5] These are:

  • Direct cellular toxicity
    • Chemotherapy
    • Radiotherapy
    • Thermal injury
    • Smoking
  • Extraosseous arterial fracture
    • Hip dislocation
    • Femoral neck fracture
    • Iatrogenic post-surgery
    • Congenital arterial abnormalities
  • Extraosseous venous
    • Venous abnormalities
    • Venous stasis
  • Intraosseous extravascular compression
    • Hemorrhage
    • Elevated bone marrow pressure
    • Fatty infiltration of bone marrow due to prolonged high-dose corticosteroid use
    • Cellular hypertrophy and marrow infiltration (Gaucher's disease)
    • Bone marrow edema
    • Displaced fractures
  • Intraosseous intravascular occlusion
    • Coagulation disorders such as thrombophilias and hypofibrinolysis
    • Sickle cell crises
  • Multifactorial 

In a small percentage of cases, mutations in the COL2A1 gene, which codes for type 2 collagen production, have demonstrated autosomal dominant inheritance patterns.[6] However, in many cases, a cause cannot be identified, and these patients receive the designation of idiopathic osteonecrosis.

Repetitive trauma, like assembly line work, can lead to AVN over time. Nontraumatic risks for AVN include anything potentially impacting vascular flow to the bone. Radiation can induce bone marrow changes leading to AVN.[7] Hyperlipidemia causes significant blockage of small blood vessels reducing the blood flow that provides bone with nutrients. Medical conditions like sickle cell anemia can also diminish the vascular supply to the bone.[8]

Anatomy with low collateral capabilities or retrograde vasculature, such as the carpus, is at increased risk for necrosis.[9] Unique anatomy also plays a role in the talus, where a considerable portion of its surface area consists of articular cartilage, which also restricts opportunities for blood flow.[10]

Glucocorticoids used at high doses and for prolonged periods can induce osteonecrosis via osteocyte apoptosis. Apoptosis disrupts the lacunar-canicular system.[2] Other risk factors for AVN: are alcohol misuse, blood dyscrasias, autoimmune diseases such as lupus, etc. The cause of interrupted blood flow is unknown for twenty-five percent of people with AVN. For example, in Kienbock and Preiser disease, the exact cause of AVN is usually inexplicable.[3][11]  


Osteonecrosis is most common in the hip but is also seen in the humerus, knee, and talus and is rarely seen in the smaller bones of the wrist, such as the lunate. While the jaw can be affected, this review focuses on more common forms presented to an orthopedic surgeon.

Ten percent of total hip arthroplasties in the United States are due to AVN and typically affect ages 30 to 65 years old. Males tend to be more affected by ON overall, but autoimmune conditions affecting women, like lupus, are also significant.[1] Less common variants, such as Preiser disease (osteonecrosis of the scaphoid), tend to affect the dominant hand of middle-aged women most.[12] In contrast, Keinbock's disease (osteonecrosis of the lunate) is more common in middle-aged males involved in manual labor, and there have even been case reports involving children.[13]


A reduction in subchondral blood supply induces a state of hypoxia, leading to loss of integrity of cell membranes and necrosis of cells. The pathological appearances of necrosis marked by the appearance of neutrophils and macrophages will predominate. Macroscopically this induces subchondral collapse and subsequent joint degeneration.

MRI will demonstrate osteosclerotic changes secondary to decreased bone resorption as a result of disrupted osteoclast function. Specifically, the T2 signal will be increased, and the T1 signal will be decreased due to fat cell edema/ischemia of bone marrow.[9]


Osteocytes undergo apoptosis, and phagocytosis cannot occur. Thus the osteocytes are not replaced. This process leads to poor bone remodeling and osteosclerosis.[9] 

History and Physical

Non-traumatic cases will typically present with mechanical pain of variable onset and severity and are often difficult to localize. In early disease, the physical examination is usually normal and inevitably causes a delay in diagnosis.[4] A focused history should include recent trauma, steroid use, autoimmune disease, sickle cell, alcoholism, tobacco use, manual labor, change in gait, connective tissue disorders, insidious onset pain, and decreased range of motion.[8] 

Osteonecrosis of the hip often has early stages that are often asymptomatic. Hip and groin pain is the most common presenting symptoms and usually indicate late-stage progression. Associated symptoms can include referred pain in the buttock and thigh. The majority of patients have pain at rest. Others include stiffness and changes in gait.[1]

Osteonecrosis of the knee most commonly presents as acute onset knee pain that occurs while weight-bearing and at night. A history of osteoporosis or osteopenia and no recent trauma are typical responses. On physical exam, pain with palpation over the medial femoral condyle and decreased range of motion is observed.[14]

Osteonecrosis of the shoulder, involving the proximal humerus, is often associated with trauma and osteonecrosis elsewhere in the body. Pain is characterized as pulsating with radiation to the elbow and a decreased active range of motion.[15]

Osteonecrosis of the talus is associated with polyarticular disease and trauma. Patients often complain of pain and difficulty ambulating well beyond the expected recovery time following a traumatic event.[16][10]

Osteonecrosis of the lunate and scaphoid most often presents without a history of trauma. Patients are usually skilled laborers and complain of unilateral pain in the wrist's dorsal and radial aspects. Other common findings include decreased range of motion, wrist swelling, and weakened grip strength.[13][17] 


Initial evaluation with plain radiographic films demonstrating two orthogonal views is the initial diagnostic standard, although they often appear normal in the early course of the disease. Magnetic resonance imaging is the recommendation for detecting earlier stages of the disease due to its high sensitivity in detecting bone edema.[5]


Osteonecrosis of the Hip

Femoral head osteonecrosis falls into two classes: traumatic and atraumatic. Of the atraumatic cases, up to 70% may be bilateral.[18] Common classifications that map the phases of osteonecrosis of the hip include the Ficat and Arlet classification and the Steinberg classification.[19][20] Ficat and Arlet describe the four stages of disease progression based on clinical and radiographic findings. Stage 1 is the initiation of the disease without radiological findings. Stage IV is the end stage with femoral head collapse, flattening, and narrowing of the joint space. The Steinberg classification incorporates the use of MRI to detect a pre-clinical lesion and also to assess the size of the lesion.

Osteonecrosis of the Knee

Spontaneous osteonecrosis of the knee (SONK) is the most common type.[21] Secondary osteonecrosis is commoner in a younger population and is often associated with several risk factors common to all kinds of osteonecrosis, as previously discussed. The third and rarest type is called post-arthroscopic osteonecrosis and has been seen in 4% of patients having undergone an arthroscopic meniscectomy. SONK typically presents in the sixth decade of life and is more common in the female population. Classically it affects the medial femoral condyle (up to 94% of cases), and subsequent cadaveric studies have demonstrated a watershed area of the medial femoral condyle.[22][14] The overriding symptom is medial knee pain, often mimicking a torn meniscus. The Koshino classification describes the four stages of disease progression.[22] Stage 1 describes clinical disease without radiologically apparent disease. Stage 4 is the degenerative phase with osteosclerosis and osteophyte formation around the condyles.

Osteonecrosis of the Shoulder

Osteonecrosis of the shoulder most frequently results from trauma; however, it can arise from the causes outlined above, for instance, prolonged high-dose corticosteroid usage. Hertel et al.[23] showed that specific fracture plane combinations had associations with impaired head perfusion and that additional elements, such as the length of the posteromedial metaphyseal head extension and the integrity of the medial hinge, were the key elements for the occurrence of osteonecrosis. Most fracture patterns with an increased risk of avascular necrosis had an anatomic neck component. Interestingly fracture-dislocations and degree of displacement of the fragments do not predict an increased incidence of avascular necrosis of the humeral head, although contradictory evidence does exist. Classification is the Cruess classification and uses five categories.[24] Stage 1 describes normal X-ray findings with pathology only recognized on MRI scans. Stage four demonstrates flattening of the humeral head with collapse. Stage five is the end stage, with degenerative changes that extend to the glenoid.

Osteonecrosis of the Talus

Most commonly caused by trauma resulting in displaced fractures to the neck of the talus. The incidence of avascular necrosis increases with co-existing dislocation at the ankle or subtalar joint. The talus body is often affected by a predominate cartilaginous surface limiting its vascular supply.[25] The Hawkins classification best describes the disease progression. If osteonecrosis is to occur, the pathognomonic subchondral lucency known as the Hawkins sign will be absent on plain radiographs at 6 to 8 weeks.

Osteonecrosis of the Lunate

More commonly known as Keinbock disease involves a collapse of the lunate due to vascular insufficiency and osteonecrosis. A history of repetitive trauma, biomechanical factors related to ulna variance, and anatomic factors such as the presence of both dorsal and palmar blood supply may contribute to the risk of avascular necrosis. The Lichtman staging of Keinbock disease uses four stages. The first radiographic feature becomes apparent in stage 2 disease, represented by lunate sclerosis without height loss.[17] Lunate collapse and palmar scaphoid rotation is the radiologic feature in stage 3 disease. Intercarpal joint degeneration is the dominant feature of end-stage disease.[17]

Osteonecrosis of the Scaphoid

Known as Preiser disease, it arises from an uncertain etiology. Risk factors include alcohol abuse, trauma, steroid use, and connective tissue disorders.[3][12] Typically it affects middle-aged males' dominant hand, although it can present bilaterally. A radiograph shows scaphoid sclerosis early in the disease process. Late-stage findings demonstrate cystic changes and fragmentation. MRI may detect T1/T2 signal changes throughout the scaphoid or specific to the proximal pole. The Herbert and Lanzetta classification system is used to assess progression. The system consists of four stages that begin with changes to the scaphoid's proximal pole, followed by eventual carpal collapse.[12]

Treatment / Management

Osteonecrosis of the Hip

Nonoperative treatment ( Alendronate only therapy and bisphosphonates combination) is controversial, with some trials showing the benefit of bisphosphonates in preventing a femoral head collapse and delaying disease progression in early cases with subchondral lucency. However, its delayed onset of pain relief can compromise its compliance.[26]

Many patients will ultimately need a total hip arthroplasty; however, joint salvaging procedures such as core decompression report varying results. Core decompression is most effective in the early stages of osteonecrosis and when the lesions only involve a small amount of the weight-bearing surface of the femoral head.[27] The procedure may use vascularised bone grafts or biological agents that promote bone repair. Core decompression is safe and effective in the early stages of osteonecrosis. Its use, combined with using autologous bone or bone marrow, can increase its success rate.[28]Interestingly Zhao et al. used perfusion studies to show core decompression is more effective in femoral heads with venous congestion than those with arterial compromise.[29] Core decompression is indicated when etiology is reversible to reduce intraosseous pressure and stimulate bone healing. Traditionally, it was performed using an 8 or 10-mm drill through the subchondral sclerotic area. Alternatively, a 3.2 mm guide wire can be drilled multiple times to decompress the lesion.(A1)

Rotational osteotomy can be indicated when the lesion can be diverted away from the weight-bearing surface. Medial diseases can be rotated through intertrochanteric varus osteotomy, while anterolateral disease can be rotated via intertrochanteric valgus and flexion-producing osteotomy. [30] Rotational osteotomy has a success rate of up to 90%; however, it can make future total hip arthroplasty more challenging.[31][32](A1)

Total hip arthroplasty is indicated for irreversible etiologies and when patients are older than 40 years and have large lesions or in young with more advanced femoral head collapse and degenerate acetabulum. Cementless prosthesis for both femur and acetabulum is predominantly used; however, extreme caution must be taken during femoral canal preparation to avoid perforation. Outcomes are usually good in terms of pain reduction and functional improvement. However, a high rate of polyethylene wear and osteolysis have been reported in young patients with osteonecrosis.[33][34]

Hip arthrodesis would be indicated only in young patients involved in heavy labor occupations.

SONK (Spontaneous Osteonecrosis of the Knee)

Most cases resolve following a trial of protected weight-bearing and physiotherapy focused on quadriceps strengthening. In recent literature, bisphosphonates have been shown to reduce the need for surgery by 50% by delaying postnecrotic remodeling and preventing joint surface collapse.[35] As SONK is more common in the older person, a unicompartmental knee replacement provides a good functional outcome with a relatively short rehabilitation time.[21] However, a total knee replacement may be more appropriate in larger lesions. Smaller lesions following intraosseous decompression have achieved good operative results. High tibial osteotomy will have a role in cases associated with malalignment. Joint-preserving procedures such as a combination of arthroscopy and core decompression or osteochondral autograft transfer have successfully postponed knee arthroplasty in selected patients SONK in the precollapse stage.[36]

Osteonecrosis of the Shoulder

Nonoperative treatment is the first line of treatment: pain control, physiotherapy, and modification of activities to restrict overhead activities and manual labor.

Operative management is classified according to staging. For early disease, core decompression is the preferred treatment option. Humeral head resurfacing or hemiarthroplasty is recommended for moderate disease with focal cartilage defects and sufficient epiphyseal bone stock. A total shoulder replacement is reserved for advanced disease.[10]

Osteonecrosis of the Talus

The incidence of osteonecrosis of the talus in talar neck fractures is reduced by utilizing a procedure to achieve operative anatomic reduction and stable fixation.[5]

Keinbock’s Disease

Treatment in early-stage disease aims to revascularize the lunate either directly using bone grafts or indirectly utilizing procedures to offload the lunate. Immobilization, including external fixation, is often attempted in stage 1 and 2 diseases.[17] Surgical options address the carpal collapse in stage 3, whereas advanced disease may warrant joint sacrificing procedures such as wrist arthrodesis.[17]

Preiser Disease

Early-stage treatment options involve immobilization, cortisone injections, radial wedge osteotomy, and bone graft. Later stages may warrant arthroscopic debridement, scaphoid excision, proximal row carpectomy, or even arthrodesis. Typically, surgical intervention is unavoidable in most cases.[12]

Differential Diagnosis

  • Bone marrow edema syndrome (aka, transient osteopenia)[1]
  • Complex regional pain syndrome
  • Inflammatory synovitis
  • Neoplastic bone conditions
  • Osteoarthritis
  • Osteochondrosis[9]
  • Osteoarthritis
  • Osteomyelitis
  • Osteoporosis
  • Rheumatoid arthritis
  • Septic arthritis
  • Soft tissue trauma (e.g., labral tears, meniscal tears)[14]
  • Subchondral fractures[1]


The prognosis for osteonecrosis is often poor, regardless of the initial management strategy. Progression of the disease includes persistent pain, debilitation, and destruction of the joint beyond repair. Mont et al.reported that 59% of asymptomatic lesions progressed to symptoms or collapse.[2] AVN of the humeral head, in particular, can be even worse, with as many as 81% of patients progressing to total failure and requiring arthroplasty.[8] Therefore once the patient faces the onset of osteonecrosis, there is a high probability that it will continue to advance.

Core decompression and bone grafting can prevent the progression of osteonecrosis of the hip. However, with advanced disease or failure of joint-preserving therapies, total hip arthroplasty is needed but is associated with increased complication rates.[37]

Core decompression and hemiarthroplasty of the shoulder have good outcomes in treating AVN in the early stages. However, total shoulder arthroplasty has higher complication rates. Total shoulder arthroplasties are indicated for end-stage AVN but put the patient at risk for postoperative complications.[15]

In Preiser and Kienbock disease, the initial stages of AVN are treated with immobilization, but eventual surgical intervention is usually indicated.[12][17] Surgical repair of the talus in AVN management tends to have significantly better outcomes in younger patients.[10]


Common postoperative complications for osteonecrosis include surgical site infections, prosthesis malfunctions, and neurovascular compromise.[15] High failure rates occur as the disease continues to progress despite surgical intervention. For example, core decompression failed to prevent disease progression in 90% of patients treated for AVN of the hip.[8] In Kienbock's disease, not taking into account the patient's unique anatomy when performing an osteotomy of the radius can result in excessive positive ulnar variance and ulnar pain postoperatively.[17]

Patient comorbidities greatly influence complication rates as well. For example, patients with sickle cell disease undergoing total joint replacement for AVN had more extended hospital stays, increased likelihood of acute kidney injury, implant failure, pulmonary embolism, deep vein thrombosis, myocardial infarction, and an overall higher mortality rate.[8]

Deterrence and Patient Education

Osteonecrosis often starts even before a patient experiences symptoms. It typically progresses to end-stage disease if left untreated. Symptoms vary, but patients with late-stage disease usually have severe pain, debilitation, and even joint collapse.[1] 

Patient presentation of this disease is highly variable, so it is essential to reduce your risk factors. Ways to decrease risks include avoiding excessive alcohol consumption, no tobacco use, and tapering corticosteroids to the lowest necessary dose. Other lifestyle modifications like eating a healthy diet and maintaining an appropriate weight minimize joint damage. For manual laborers, consider avoiding repetitive activities that place strain on their joints. If possible, laborers should take regular breaks. Lastly, be proactive. Since patients with early-stage often do not have symptoms, they should seek periodic well-being evaluations by their primary care clinician.[1]

Pearls and Other Issues

There are several identified risk factors for osteonecrosis, but the exact pathogenesis remains unestablished. More likely, a combination of different factors and conditions leads to the destruction of bone cells.

Intervention depends on the phase of disease progression and varies from preservation procedures to more definitive salvage operations.

Treatment of early-stage disease reports better results, although this may be difficult to achieve as osteonecrosis is often asymptomatic in its early stages.

The majority of non-traumatic cases are associated with glucocorticoid use.[2]

Enhancing Healthcare Team Outcomes

Osteonecrosis frequently poses a diagnostic dilemma to orthopedic surgeons. Several risk factors are outlined in the literature, yet the exact pathophysiology is not fully understood. Diagnostic difficulty frequently results in delayed presentation of advanced cases of the disease, which often prevents the joint from being salvaged and increases patient morbidity. While an orthopedic surgeon is almost always involved in caring for patients with osteonecrosis, educating healthcare professionals who encounter these patients at the hospital front door, such as general practitioners, emergency department physicians, nurses, and physiotherapists, is essential. This way, a well-functioning interprofessional healthcare team approach to patient care in these cases is possible, with each member contributing from their area of expertise, exercising open communication with the rest of the team, and documenting all interactions with the patient, so that the appropriate caregiver can be contacted if changes in the patient's regimen or rehabilitation are necessary. This interprofessional approach will yield the best patient results. [Level 5]


(Click Image to Enlarge)
<p>Dysbaric Osteonecrosis of the Hip</p>

Dysbaric Osteonecrosis of the Hip

Contributed by UHM 2005, Vol. 32, No. 3 – Dysbaric osteonecrosis by X-ray and CT scan in Chinese divers. JIANG et al

(Click Image to Enlarge)
Dysbaric Osteonecrosis, CT scan
Dysbaric Osteonecrosis, CT scan
Contributed by JIANG et al, UHM 2005, Vol. 32, No. 3

(Click Image to Enlarge)
Jaw Osteonecrosis
Jaw Osteonecrosis
Image courtesy S Bhimji MD

(Click Image to Enlarge)
Severe AVN of hip
Severe AVN of hip
Image courtesy S Bhimji

(Click Image to Enlarge)
Osteonecrosis of knee
Osteonecrosis of knee
Image courtesy S.Bhimji MD



Lespasio MJ, Sodhi N, Mont MA. Osteonecrosis of the Hip: A Primer. The Permanente journal. 2019:23():. pii: 18-100. doi: 10.7812/TPP/18-100. Epub     [PubMed PMID: 30939270]


Weinstein RS. Glucocorticoid-induced osteonecrosis. Endocrine. 2012 Apr:41(2):183-90. doi: 10.1007/s12020-011-9580-0. Epub 2011 Dec 15     [PubMed PMID: 22169965]

Level 3 (low-level) evidence


Afshar A, Tabrizi A. Avascular Necrosis of the Carpal Bones Other Than Kienböck Disease. The Journal of hand surgery. 2020 Feb:45(2):148-152. doi: 10.1016/j.jhsa.2019.05.022. Epub 2019 Oct 1     [PubMed PMID: 31585747]


Mücke T, Krestan CR, Mitchell DA, Kirschke JS, Wutzl A. Bisphosphonate and Medication-Related Osteonecrosis of the Jaw: A Review. Seminars in musculoskeletal radiology. 2016 Jul:20(3):305-314     [PubMed PMID: 27741546]


Shah KN, Racine J, Jones LC, Aaron RK. Pathophysiology and risk factors for osteonecrosis. Current reviews in musculoskeletal medicine. 2015 Sep:8(3):201-9. doi: 10.1007/s12178-015-9277-8. Epub     [PubMed PMID: 26142896]


Liu YF, Chen WM, Lin YF, Yang RC, Lin MW, Li LH, Chang YH, Jou YS, Lin PY, Su JS, Huang SF, Hsiao KJ, Fann CS, Hwang HW, Chen YT, Tsai SF. Type II collagen gene variants and inherited osteonecrosis of the femoral head. The New England journal of medicine. 2005 Jun 2:352(22):2294-301     [PubMed PMID: 15930420]


Meixel AJ, Hauswald H, Delorme S, Jobke B. From radiation osteitis to osteoradionecrosis: incidence and MR morphology of radiation-induced sacral pathologies following pelvic radiotherapy. European radiology. 2018 Aug:28(8):3550-3559. doi: 10.1007/s00330-018-5325-2. Epub 2018 Feb 23     [PubMed PMID: 29476220]


Naseer ZA, Bachabi M, Jones LC, Sterling RS, Khanuja HS. Osteonecrosis in Sickle Cell Disease. Southern medical journal. 2016 Sep:109(9):525-30. doi: 10.14423/SMJ.0000000000000516. Epub     [PubMed PMID: 27598354]


Schmitt R, Kalb KH, Christopoulos G, Grunz JP. Osteonecrosis of the Upper Extremity: MRI-Based Zonal Patterns and Differential Diagnosis. Seminars in musculoskeletal radiology. 2019 Oct:23(5):523-533. doi: 10.1055/s-0039-1695719. Epub 2019 Sep 25     [PubMed PMID: 31556087]


Gross CE, Sershon RA, Frank JM, Easley ME, Holmes GB Jr. Treatment of Osteonecrosis of the Talus. JBJS reviews. 2016 Jul 12:4(7):. pii: e2. doi: 10.2106/JBJS.RVW.15.00087. Epub     [PubMed PMID: 27509328]


Lluch A, Garcia-Elias M. Etiology of Kienböck disease. Techniques in hand & upper extremity surgery. 2011 Mar:15(1):33-7. doi: 10.1097/BTH.0b013e3182107329. Epub     [PubMed PMID: 21358523]


Lin JD, Strauch RJ. Preiser disease. The Journal of hand surgery. 2013 Sep:38(9):1833-4. doi: 10.1016/j.jhsa.2013.06.019. Epub 2013 Aug 6     [PubMed PMID: 23928017]


Irisarri C. Aetiology of Kienböck's disease. Journal of hand surgery (Edinburgh, Scotland). 2004 Jun:29(3):281-7     [PubMed PMID: 15142701]


Sibilska A, Góralczyk A, Hermanowicz K, Malinowski K. Spontaneous osteonecrosis of the knee: what do we know so far? A literature review. International orthopaedics. 2020 Jun:44(6):1063-1069. doi: 10.1007/s00264-020-04536-7. Epub 2020 Apr 5     [PubMed PMID: 32249354]


Franceschi F, Franceschetti E, Paciotti M, Torre G, Samuelsson K, Papalia R, Karlsson J, Denaro V. Surgical management of osteonecrosis of the humeral head: a systematic review. Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA. 2017 Oct:25(10):3270-3278. doi: 10.1007/s00167-016-4169-z. Epub 2016 May 19     [PubMed PMID: 27198139]

Level 1 (high-level) evidence


Sultan AA, Mont MA. Core Decompression and Bone Grafting for Osteonecrosis of the Talus: A Critical Analysis of the Current Evidence. Foot and ankle clinics. 2019 Mar:24(1):107-112. doi: 10.1016/j.fcl.2018.11.005. Epub     [PubMed PMID: 30685004]


Allan CH, Joshi A, Lichtman DM. Kienbock's disease: diagnosis and treatment. The Journal of the American Academy of Orthopaedic Surgeons. 2001 Mar-Apr:9(2):128-36     [PubMed PMID: 11281636]


Kaushik AP, Das A, Cui Q. Osteonecrosis of the femoral head: An update in year 2012. World journal of orthopedics. 2012 May 18:3(5):49-57. doi: 10.5312/wjo.v3.i5.49. Epub     [PubMed PMID: 22655222]


Jawad MU, Haleem AA, Scully SP. In brief: Ficat classification: avascular necrosis of the femoral head. Clinical orthopaedics and related research. 2012 Sep:470(9):2636-9. doi: 10.1007/s11999-012-2416-2. Epub     [PubMed PMID: 22760600]


Steinberg ME, Hayken GD, Steinberg DR. A quantitative system for staging avascular necrosis. The Journal of bone and joint surgery. British volume. 1995 Jan:77(1):34-41     [PubMed PMID: 7822393]


Karim AR, Cherian JJ, Jauregui JJ, Pierce T, Mont MA. Osteonecrosis of the knee: review. Annals of translational medicine. 2015 Jan:3(1):6. doi: 10.3978/j.issn.2305-5839.2014.11.13. Epub     [PubMed PMID: 25705638]


Koshino T. The treatment of spontaneous osteonecrosis of the knee by high tibial osteotomy with and without bone-grafting or drilling of the lesion. The Journal of bone and joint surgery. American volume. 1982 Jan:64(1):47-58     [PubMed PMID: 7033231]


Hertel R, Hempfing A, Stiehler M, Leunig M. Predictors of humeral head ischemia after intracapsular fracture of the proximal humerus. Journal of shoulder and elbow surgery. 2004 Jul-Aug:13(4):427-33     [PubMed PMID: 15220884]


Cruess RL. Experience with steroid-induced avascular necrosis of the shoulder and etiologic considerations regarding osteonecrosis of the hip. Clinical orthopaedics and related research. 1978 Jan-Feb:(130):86-93     [PubMed PMID: 639411]


Chiodo CP,Herbst SA, Osteonecrosis of the talus. Foot and ankle clinics. 2004 Dec;     [PubMed PMID: 15498705]


D Orth SA, Vijayvargiya M. A Paradigm Shift in Osteonecrosis Treatment with Bisphosphonates: A 20-Year Study. JB & JS open access. 2021 Oct-Dec:6(4):. doi: 10.2106/JBJS.OA.21.00042. Epub 2021 Dec 17     [PubMed PMID: 34934885]


Stubbs AJ, Atilla HA. The Hip Restoration Algorithm. Muscles, ligaments and tendons journal. 2016 Jul-Sep:6(3):300-308. doi: 10.11138/mltj/2016.6.3.300. Epub 2016 Dec 21     [PubMed PMID: 28066734]


Hua KC, Yang XG, Feng JT, Wang F, Yang L, Zhang H, Hu YC. The efficacy and safety of core decompression for the treatment of femoral head necrosis: a systematic review and meta-analysis. Journal of orthopaedic surgery and research. 2019 Sep 11:14(1):306. doi: 10.1186/s13018-019-1359-7. Epub 2019 Sep 11     [PubMed PMID: 31511030]

Level 1 (high-level) evidence


Zhao DW, Yu XB. Core decompression treatment of early-stage osteonecrosis of femoral head resulted from venous stasis or artery blood supply insufficiency. The Journal of surgical research. 2015 Apr:194(2):614-621. doi: 10.1016/j.jss.2014.12.007. Epub 2014 Dec 11     [PubMed PMID: 25582883]

Level 2 (mid-level) evidence


Tanaka R, Yasunaga Y, Fujii J, Yamasaki T, Shoji T, Adachi N. Transtrochanteric rotational osteotomy for various hip disorders. Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association. 2019 May:24(3):463-468. doi: 10.1016/j.jos.2018.10.026. Epub 2018 Dec 13     [PubMed PMID: 30554936]


Lee YK, Ha YC, Kim KC, Yoo JJ, Koo KH. Total hip arthroplasty after previous transtrochanteric anterior rotational osteotomy for femoral head osteonecrosis. The Journal of arthroplasty. 2009 Dec:24(8):1205-9. doi: 10.1016/j.arth.2009.04.013. Epub 2009 Jun 12     [PubMed PMID: 19523785]


Shigemura T, Yamamoto Y, Murata Y, Sato T, Tsuchiya R, Mizuki N, Toki Y, Wada Y. Total hip arthroplasty after failed transtrochanteric rotational osteotomy for osteonecrosis of the femoral head: A systematic review and meta-analysis. Orthopaedics & traumatology, surgery & research : OTSR. 2018 Dec:104(8):1163-1170. doi: 10.1016/j.otsr.2018.06.019. Epub 2018 Oct 4     [PubMed PMID: 30293751]

Level 1 (high-level) evidence


Farook MZ, Awogbade M, Somasundaram K, Reichert ILH, Li PLS. Total hip arthroplasty in osteonecrosis secondary to sickle cell disease. International orthopaedics. 2019 Feb:43(2):293-298. doi: 10.1007/s00264-018-4001-0. Epub 2018 Jun 15     [PubMed PMID: 29907913]


Bernhard ME, Barnes CL, DeFeo BM, Kaste SC, Wang X, Lu Z, Neel MD. Total Hip Arthroplasty in Adolescents and Young Adults for Management of Advanced Corticosteroid-Induced Osteonecrosis Secondary to Treatment for Hematologic Malignancies. The Journal of arthroplasty. 2021 Apr:36(4):1352-1360. doi: 10.1016/j.arth.2020.10.019. Epub 2020 Oct 19     [PubMed PMID: 33281023]


Jureus J, Lindstrand A, Geijer M, Roberts D, Tägil M. Treatment of spontaneous osteonecrosis of the knee (SPONK) by a bisphosphonate. Acta orthopaedica. 2012 Oct:83(5):511-4. doi: 10.3109/17453674.2012.729184. Epub 2012 Sep 24     [PubMed PMID: 22998531]


Duany NG, Zywiel MG, McGrath MS, Siddiqui JA, Jones LC, Bonutti PM, Mont MA. Joint-preserving surgical treatment of spontaneous osteonecrosis of the knee. Archives of orthopaedic and trauma surgery. 2010 Jan:130(1):11-6. doi: 10.1007/s00402-009-0872-2. Epub     [PubMed PMID: 19387670]


Cohen-Rosenblum A, Cui Q. Osteonecrosis of the Femoral Head. The Orthopedic clinics of North America. 2019 Apr:50(2):139-149. doi: 10.1016/j.ocl.2018.10.001. Epub 2019 Feb 12     [PubMed PMID: 30850073]