U.S. flag

An official website of the United States government

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.

StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2024 Jan-.

Cover of StatPearls

StatPearls [Internet].

Show details

Septic Bursitis

; ; .

Author Information and Affiliations

Last Update: April 22, 2023.

Continuing Education Activity

Bursae are fluid-filled sacs that produce small amounts of synovial fluid to reduce friction between mobile structures of the musculoskeletal system. Inflammation of the bursa due to prolonged pressure, overuse, trauma or arthritis, causes excess fluid production and leads to swelling and irritation, known as bursitis. Septic (or infectious) bursitis occurs when infection from either direct inoculation, hematogenous or direct spread from other sites causes inflammatory bursitis. Bursa aspiration and fluid analysis must be completed to make an accurate diagnosis. This activity reviews the evaluation and management of septic bursitis and highlights the role of the interprofessional team to improve care for patients with this condition.


  • Review the causes of septic bursitis.
  • Describe the work up of a patient with septic bursitis.
  • Summarize the treatment options for septic bursitis.
  • Outline the importance of improving care coordination among the interprofessional team members to detect the condition using bursa aspiration and fluid analysis to enhance the delivery of care in patients with septic bursitis.
Access free multiple choice questions on this topic.


Bursae are fluid-filled sac-like structures located between mobile structures of the musculoskeletal system, between skin and bone, or between the joints. There are upward of 150 superficial and deep bursae located in between bone, muscle, tendons, and skin. Small amounts of synovial fluid are produced within the bursa and reduce friction by lubrication. Inflammation of the bursa causes excess fluid production and leads to swelling and irritation, known as bursitis. This inflammation can be caused by prolonged pressure, overuse, inflammatory and crystalloid arthritis, and direct injury or trauma. Common locations of bursitis include prepatellar, olecranon, and trochanteric.[1][2][3][4]

Septic (or infectious) bursitis occurs when infection from either direct inoculation (usually superficial bursa) or hematogenous or direct spread from other sites (deep bursa involvement) causes inflammatory bursitis. Septic bursitis can be acute, subacute, or recurrent/chronic. The clinical features of septic bursitis are sometimes indistinguishable from non-infectious bursitis; therefore, bursa aspiration and fluid analysis must be completed to make an accurate diagnosis.


Inoculating the bursa with infections bacteria causes septic bursitis. This happens most often from micro-trauma or direct puncture of the overlying skin causing subsequent infection. Contiguous spread of overlying cellulitis of the skin is also a common cause of superficial septic bursitis. In 80% to 90% of cases, Staphylococcus aureus is the most common organism in acute septic bursitis and Streptococcus species being the next. Other organisms include Escherichia coli, Enterococcus, Pseudomonas aeruginosa, and coagulase-negative staphylococci. Chronic, infectious bursitis is likely due to atypical mycobacteria and fungi and should warrant prompt evaluation for systemic infection.[5][6][7]


Septic bursitis happens more commonly in males with the mean age at onset approximately 50 years. Some studies suggest increases in the incidence of septic bursitis in relation to people with comorbid disease conditions, but most cases are due to repetitive trauma related to occupational behaviors. Plumbers, carpenters, roofers, clergy, and athletes are commonly affected. Septic bursitis can also be caused by joint steroid injections meant to relieve the symptoms of non-infectious bursitis. Patients with underlying crystal-induced arthropathy like Gout have an increased amount of bursal fluid and can have higher incidences of septic bursitis. People with inflammatory arthritis, for example, rheumatoid arthritis, are also at an increased risk.


Bursitis is the result of inflammation that leads to increased fluid production from the synovial cells that line the bursa. Increased fluid production leads to increasing pressure of the bursa and in the result, increased pain. Trauma or puncture of skin at the site of a bursa can lead to the direct introduction of bacteria and subsequent inflammation and infection. Overlying skin and soft tissue infections such as cellulitis can also lead to secondary infectious bursitis. In deep bursa, an infectious spread is more likely related to spread from blood or joint infections such as septic arthritis.

History and Physical

History may allude to the recent trauma of the affected area or an occupation suspicious for a high likelihood of septic bursitis. Therefore, it is important to ask relevant questions. Clinical findings may be indistinguishable from non-infectious bursitis and sometimes even a septic joint. Patients with septic bursitis are more likely to present with pain or tenderness overlying the bursa, edema, erythema, and warmth. Patients may also have signs of trauma or wounds and lesions with or without symptoms of cellulitis. Fever may or may not be present but is more likely to be present when bursitis is infectious versus when it is non-infectious. Joint motion is usually unaffected in septic bursitis and likely limited with septic arthritis. The findings discussed above are not completely reliable in distinguishing between infectious and non-infectious bursitis, and therefore, additional diagnostic testing must be done. In a nutshell, the following should be the focus of the examination; swelling size, consistency (soft, firm, hard), fluctuance, associated cellulitis, and any lymphadenopathy. Also, the range of movement and pain of the adjacent joint should be carefully assessed and documented.


Ideally, investigations checking inflammatory markers and blood culture should be performed prior to starting antibiotic therapy. Routine blood work is somewhat unhelpful in the diagnosis and distinguishing septic bursitis versus non-infectious bursitis. The peripheral white blood count (WBC) may not differ between infectious and non-infectious bursitis and may not even be elevated above the normal range. However, C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) usually are elevated in septic bursitis. A uric blood acid level should also be checked if suspicion of underlying crystal arthropathy exists. Antinuclear antibody and rheumatoid factor can be ordered in chronic cases or when the underlying autoimmune disease is suspected. Plain film radiography is usually performed, but it is unnecessary and unhelpful in most cases of septic bursitis. Spurs may be seen in chronic cases of bursitis, but joint effusions are not normally present. Computed tomography (CT) and magnetic resonance imagining (MRI) are not needed unless suspicion for osteomyelitis or septic arthritis exists, or if the physician is evaluating a severe case of septic bursitis in which surgical management may be necessary.[8][9][10].Magnetic resonance imaging has been reported in the literature as a reliable negative predictor of septic bursitis when there is no bursal and soft tissue enhancement [11].

 Aspiration and analysis of bursal fluid is the gold standard of diagnostic criteria. A bursal fluid analysis should always be performed in any case of bursitis to rule out septic or crystal-induced bursitis. Fluid should be evaluated for cell count with differential, gram stain, culture, and crystals. In recent literature summaries, the average bursal WBC was found to be around 63,000/mm; although, other studies show leukocytosis of more than 2000/mm was 94% sensitive and 79% specific for septic bursitis. Septic bursitis usually has a predominance of polymorphonuclear leukocytes while non-infectious has a predominance of mononuclear cells. Gram staining can vary between 15% and 100% sensitive and may only be positive in half of septic bursitis cases. However, a negative gram stain with WBC more than 50,000/hpf, and clinical signs and suspicion for septic bursitis should be treated accordingly. The culture of bursal fluid should always be done in order to evaluate for any bacterial growth in order to help guide treatment.

Treatment / Management

Although non-infectious bursitis can be managed with conservative measures aimed at reducing inflammation, treatment for septic bursitis is always antibiotic therapy. Injection of non-steroidal anti-inflammatory drugs (NSAIDs) can be offered to control pain and injection of corticosteroids can be offered to cases where pain can not be controlled by NSAIDs. Treatment can be done on an outpatient basis with or without needle aspiration [12][13]; although, inpatient treatment with intravenous antibiotic therapy may be needed in patients who are immunocompromised, show systemic signs and symptoms, or have joint involvement [14]. Antibiotic therapy should initially be aimed at the most likely organisms and tailored as needed to gram-stain and culture results. Methicillin-resistant Staphylococcus aureus coverage with oral clindamycin, doxycycline, or trimethoprim-sulfamethoxazole is recommended for empiric therapy until culture results are finalized. If there is a severe local infection or in an immunocompromised patient, admission for intravenous vancomycin is most appropriate. For those patients with a penicillin allergy, the recommended treatment is ciprofloxacin and rifampin. 

Duration and type of therapy are debated. Recommendations include a minimum of 10 days of treatment in mild cases, and repeat aspirations and continuation of antibiotics until bursal fluid is clear of infectious signs in severe cases. Treatment can usually be guided by clinical response and culture results

Indications for Operative Intervention

  • Significant pointing swellings [15].
  • Severe cases that are unresponsive to medical treatment with antibiotics alone.
  • Chronic cases.
  • Recurrent cases.

Operative Intervention

  • Needle aspiration together with systemic antibiotics.
  • Incision and drainage if aspiration fails due to loculation [15].
  • Suction irrigation [16].
  • Open or arthroscopic bursectomy: it was reported that single-stage acute bursectomy has higher recurrence rates in comparison to two-stage bursectomy with delayed primary closure [14]. The arthroscopic approach has a lower risk of wound complications in comparison with open approach.

Differential Diagnosis

  • Cellulitis
  • Gout and Pseudogout
  • Rheumatoid Arthritis
  • Soft Tissue Knee Injury
  • Tendonitis


Ho and Su classification system based on clinical signs [12]:

  • Mild Bursitis: local inflammation with no associated systemic signs.
  • Moderate Bursitis: significant local inflammation with or without mild systemic signs.
  • Severe Bursitis: intense peri-bursal cellulitis with or without infected wound with systemic signs e.g. pyrexia or rigors, or a serum leukocytosis >10,000/mm.

Severity within the classification increases one level if there is a comorbidity that is likely to affect healing or immune response.


  • Bursa rupture.
  • Osteomyelitis.
  • Wound healing problems (e.g. Dehiscence, excessive exudate, chronic sinus and skin necrosis).
  • Recurrence: The most significant independent risk factor for recurrence is failure to intervene operatively when it is indicated (14.6% versus 80%) [14]. Whilst, in post operative cases, immunosuppression is the single independent risk factor for recurrence.

Pearls and Other Issues

Although debate over the duration of treatment exists, the fact of the matter is septic bursitis requires antibiotic treatment. Chronic septic bursitis can develop if initially not treated appropriately. Complications such as osteomyelitis and continual pain can occur. Overlying ligaments and tendons can become weak and may rupture due to chronic infection. Therefore, tendinitis must be a consideration when diagnosing septic bursitis.

Enhancing Healthcare Team Outcomes

The management of septic bursitis requires an interprofessional effort. The majority of patients are first seen by the emergency department, primary provider or nurse practitioner. Once the condition has been diagnosed, some patients may be referred to the orthopedic surgeon for more definitive treatment. Most patients are managed as outpatients but the duration of therapy remains unknown. Because there is a potential of developing osteomyelitis, these patients must be closely monitored. Duration and type of therapy are debated. Recommendations include a minimum of 10 days of treatment in mild cases, and repeat aspirations and continuation of antibiotics until bursal fluid is clear of infectious signs in severe cases. Treatment can usually be guided by clinical response and culture results. The outcomes in most patients with septic bursitis are good. [7][17]

Review Questions


Glass M, Everist B, Nelson D, Spencer J. Methicillin-resistant Staphylococcal aureus patellar tendon abscess and septic prepatellar bursitis in an injection drug user. Radiol Case Rep. 2019 Feb;14(2):238-241. [PMC free article: PMC6250898] [PubMed: 30479679]
DeRogatis MJ, Parameswaran L, Lee P, Mayer TG, Issack PS. Septic Shoulder Joint After Pneumococcal Vaccination Requiring Surgical Debridement. HSS J. 2018 Oct;14(3):299-301. [PMC free article: PMC6148572] [PubMed: 30258336]
Herring K, Mathern S, Khodaee M. Septic Infrapatellar Bursitis in an Immunocompromised Female. Case Rep Orthop. 2018;2018:9086201. [PMC free article: PMC6011155] [PubMed: 29984025]
Parker CH, Leggit JC. Novel Treatment of Prepatellar Bursitis. Mil Med. 2018 Nov 01;183(11-12):e768-e770. [PubMed: 29800302]
Blumberg G, Long B, Koyfman A. Clinical Mimics: An Emergency Medicine-Focused Review of Cellulitis Mimics. J Emerg Med. 2017 Oct;53(4):475-484. [PubMed: 29079067]
Oda R, Sekikawa Y, Hongo I. Meningococcal Bursitis. Intern Med. 2017 Dec 15;56(24):3403-3404. [PMC free article: PMC5790738] [PubMed: 29021440]
Lieber SB, Fowler ML, Zhu C, Moore A, Shmerling RH, Paz Z. Clinical characteristics and outcomes of septic bursitis. Infection. 2017 Dec;45(6):781-786. [PubMed: 28555416]
Hanrahan JA. Recent developments in septic bursitis. Curr Infect Dis Rep. 2013 Oct;15(5):421-5. [PubMed: 23933823]
Reed MJ, Carachi A. Management of the nontraumatic hot swollen joint. Eur J Emerg Med. 2012 Apr;19(2):103-7. [PubMed: 21730866]
Wasserman AR, Melville LD, Birkhahn RH. Septic bursitis: a case report and primer for the emergency clinician. J Emerg Med. 2009 Oct;37(3):269-72. [PubMed: 17976775]
Floemer F, Morrison WB, Bongartz G, Ledermann HP. MRI characteristics of olecranon bursitis. AJR Am J Roentgenol. 2004 Jul;183(1):29-34. [PubMed: 15208103]
Ho G, Su EY. Antibiotic therapy of septic bursitis. Its implication in the treatment of septic arthritis. Arthritis Rheum. 1981 Jul;24(7):905-11. [PubMed: 7259803]
Laupland KB, Davies HD., Calgary Home Parenteral Therapy Program Study Group. Olecranon septic bursitis managed in an ambulatory setting. The Calgary Home Parenteral Therapy Program Study Group. Clin Invest Med. 2001 Aug;24(4):171-8. [PubMed: 11558851]
Perez C, Huttner A, Assal M, Bernard L, Lew D, Hoffmeyer P, Uçkay I. Infectious olecranon and patellar bursitis: short-course adjuvant antibiotic therapy is not a risk factor for recurrence in adult hospitalized patients. J Antimicrob Chemother. 2010 May;65(5):1008-14. [PubMed: 20197288]
Raddatz DA, Hoffman GS, Franck WA. Septic bursitis: presentation, treatment and prognosis. J Rheumatol. 1987 Dec;14(6):1160-3. [PubMed: 3437425]
Knight JM, Thomas JC, Maurer RC. Treatment of septic olecranon and prepatellar bursitis with percutaneous placement of a suction-irrigation system. A report of 12 cases. Clin Orthop Relat Res. 1986 May;(206):90-3. [PubMed: 3011340]
Sayegh ET, Strauch RJ. Treatment of olecranon bursitis: a systematic review. Arch Orthop Trauma Surg. 2014 Nov;134(11):1517-36. [PubMed: 25234151]

Disclosure: Justina Truong declares no relevant financial relationships with ineligible companies.

Disclosure: Ahmed Mabrouk declares no relevant financial relationships with ineligible companies.

Disclosure: John Ashurst declares no relevant financial relationships with ineligible companies.

Copyright © 2024, StatPearls Publishing LLC.

This book is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ), which permits others to distribute the work, provided that the article is not altered or used commercially. You are not required to obtain permission to distribute this article, provided that you credit the author and journal.

Bookshelf ID: NBK470331PMID: 29262131


  • PubReader
  • Print View
  • Cite this Page

Related information

  • PMC
    PubMed Central citations
  • PubMed
    Links to PubMed

Similar articles in PubMed

  • Common Superficial Bursitis.[Am Fam Physician. 2017]
    Common Superficial Bursitis.
    Khodaee M. Am Fam Physician. 2017 Feb 15; 95(4):224-231.
  • Bursitis.[StatPearls. 2024]
    Williams CH, Jamal Z, Sternard BT. StatPearls. 2024 Jan
  • Prepatellar Bursitis.[StatPearls. 2024]
    Prepatellar Bursitis.
    Rishor-Olney CR, Taqi M, Pozun A. StatPearls. 2024 Jan
  • Review Ultrasound evaluation of bursae: anatomy and pathological appearances.[Skeletal Radiol. 2017]
    Review Ultrasound evaluation of bursae: anatomy and pathological appearances.
    Ruangchaijatuporn T, Gaetke-Udager K, Jacobson JA, Yablon CM, Morag Y. Skeletal Radiol. 2017 Apr; 46(4):445-462. Epub 2017 Feb 11.
  • Review Management of septic bursitis.[Joint Bone Spine. 2019]
    Review Management of septic bursitis.
    Lormeau C, Cormier G, Sigaux J, Arvieux C, Semerano L. Joint Bone Spine. 2019 Oct; 86(5):583-588. Epub 2018 Oct 26.
See reviews...See all...

Recent Activity

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

See more...