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Hand Infections
Paronychia, deep-space and flexor sheath infections — recognition, antibiotics, drainage.

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Overview¶
Early identification and treatment of hand infections are essential to achieve optimal outcomes [1]. Delayed diagnosis can result in amputation or death [1]. Hand infections are associated with a high rate of complications that are often difficult to manage [2]. Prompt diagnosis, surgical debridement, and antibiotic coverage remain the standard of care [12].
Management principles for hand osteomyelitis include good surgical debridement and culture-guided antimicrobial therapy [3]. Antibiotic therapy typically lasts 4–6 weeks, though the optimal length and mode of administration remain under study [3]. Initial treatment of mycobacterial infections involves a combination of long-term antibiotics and surgical debridement, with reconstructive procedures aiding in restoring lost function [6]. Deep infection after hand surgery is uncommon but can lead to significant morbidity [7].
Challenges persist in managing hand infections in immunosuppressed patients and intravenous drug users [12]. Aggressive treatment is needed in immunosuppressed patients to prevent limb- and life-threatening complications from bone and soft-tissue infections [18]. The choice of empiric antibiotics for acute hand infections should be based on the severity of the infection, the comorbidities of the patient, and local prevalence of MRSA [13]. The incidence of virulent and MRSA infections is rising [18].
An initial debridement of dorsal hand infections at the bedside is at least as effective as formal debridement in the operating room [29]. Bedside debridement decreases the number of formal debridements and hospital days without increasing complications [29].
Anatomy & Pathophysiology¶
Prompt diagnosis and early treatment of hand infections are necessary to prevent complications such as hand stiffness, contractures, and amputation [17]. Hand and upper-extremity infections are usually a clinical diagnosis, but imaging and laboratory evaluation aid in diagnosis [4]. An excellent knowledge of hand anatomy and function allows for an accurate diagnosis and effective management of deep space infections [14].
Pyogenic Flexor Tenosynovitis: Early diagnosis and prompt treatment are required to preserve the digit and prevent morbidity and loss of hand function [22]. Despite timely and thorough treatment, severe pyogenic flexor tenosynovitis can lead to impaired function or amputation of the affected digit [31].
Pediatric Considerations: Pediatric hand infections involve unique environments and characteristics, including the frequency of fingers in mouths, open growth plates, and typically more robust circulation with fewer systemic comorbidities [25]. Chronic recurrent multifocal osteomyelitis of the hand is a rare pediatric condition that presents special functional and anatomical considerations [49].
Iatrogenic and Traumatic Etiologies: Complications of the fingers and hand after arthroscopic rotator cuff repair, such as carpal tunnel syndrome, flexor tenosynovitis, and complex regional pain syndrome, easily occurred in patients with a past history of carpal tunnel syndrome or tenosynovitis and in patients with edema [51]. Animal bite injuries of the hands should be treated immediately to avoid further complications [48].
Classification¶
Hand infections encompass a diverse array of entities with potential for serious morbidity [11]. Atypical hand infections are difficult to recognize and treat due to their indolent nature and nonspecific symptoms [5]. Chronic hand infections are uncommon and require a high index of suspicion for early diagnosis [9]. These chronic infections are grouped by microorganism into bacterial (mycobacterial and others), fungal, and viral types [9]. Fungal infections of the hand are most commonly cutaneous infections involving the skin and nails [23]. Renal disease and diabetes increase the risk of failed outpatient management of cellulitic hand infections [20].
Open Fracture Classification: The new classification system for open fractures of the hand divides patients into three groups based on a risk score to predict infection requiring re-debridement [34].
Necrotizing Soft Tissue Infection (NSTI) Classification: NSTIs can be classified based on anatomic location, depth of involvement, or microbial pathogen [37]. * Type II: Monomicrobial and comprise approximately 20% to 30% of cases [37]. These infections are caused by group A beta-hemolytic streptococci (GAS) either alone or in association with Staphylococcus aureus [37]. * Type IV: Fungal, rare, and primarily affect immunocompromised patients [37].
Clinical Presentation¶
Hand infections are primarily a clinical diagnosis [4]. Imaging and laboratory evaluations serve to aid in the diagnostic process [4]. Atypical hand infections present with an indolent nature and nonspecific symptoms, making them difficult to recognize [5]. Specific presentations and treatments are emphasized for each type of chronic hand infection [9]. Fingertip infections can mimic common infections, requiring awareness of obscure conditions and relevant anatomy [24].
Pediatric hand infections occur in a unique environment characterized by the frequency of fingers in mouths, open growth plates, and typically more robust circulation with fewer systemic comorbidities [25].
The diagnosis of infectious flexor tenosynovitis has historically been made based on physical exam using Kanavel's signs [26]. The specificity of Kanavel's signs for diagnosing infectious flexor tenosynovitis has come into question [26]. A higher number of Kanavel signs were present in patients with confirmed flexor tenosynovitis compared to those with finger cellulitis without concomitant flexor tenosynovitis (2.9 vs. 0.5) [26].
Radiographic soft tissue swelling does not distinguish flexor tenosynovitis from other causes [26]. Magnetic resonance imaging has been described in aiding the diagnosis of flexor tenosynovitis, but its sensitivity and specificity have not been well studied [26]. Ultrasound has been briefly studied as a diagnostic tool for flexor tenosynovitis with high sensitivity but mediocre specificity [26]. Ultrasound assessment of flexor tenosynovitis comes with inherent user variability and limitations with access and equipment [26].
Diagnosis of septic arthritis of the wrist is made based mainly on a thorough patient history, physical examination, and joint aspiration [27]. No serum laboratory values have been shown to consistently confirm wrist joint infection [27].
Investigations¶
Early identification and treatment of hand infections are essential to achieve optimal outcomes, as delayed diagnosis can result in amputation or death [1]. Early identification of atypical hand infections through appropriate laboratory testing is imperative for eradication of the causative organism [5]. A high index of suspicion coupled with an excellent knowledge of hand anatomy and function allows for an accurate diagnosis and effective management of deep space infections [14].
Laboratory: Clinicians should be aware of obscure conditions that can mimic common fingertip infections [24]. The incidence of finger infections presenting to emergency departments is rising [19]. Patients aged 40 to 59 years are most at risk for finger infections presenting to emergency departments [19]. Diagnosis of upper-extremity nontuberculous mycobacterial infections is often delayed because of indolent presentation and lack of clinical suspicion [44].
MRI: Magnetic resonance imaging (MRI) has been described in aiding the diagnosis of flexor tenosynovitis, but its sensitivity and specificity have not been well studied [26]. MRI access and time spent obtaining MRI may delay diagnosis, with a negative impact on patient outcomes [26].
CT: Contrast-enhanced computed tomography (CT) has been evaluated to increase the successful diagnosis of acute pyogenic flexor tenosynovitis [26].
Ultrasound: Ultrasound diagnosis of flexor tenosynovitis comes with inherent user variability and limitations with access and equipment [26].
Other Considerations: The specificity of Kanavel's signs for the diagnosis of infectious flexor tenosynovitis has come into question [26].
Treatment¶
Non-Operative¶
The use of prophylactic antibiotics in small elective soft tissue procedures of the hand is debated and often not necessary [7]. There is no significant difference in infection rate in elective hand surgery whether antibiotics were administered preoperatively or not [28]. Outpatient management of diabetic hand infections provides a safe alternative to inpatient admission in selected patients [33].
Operative¶
Indications: Early identification through appropriate laboratory testing is imperative for the eradication of the causative organism in atypical hand infections [5]. Surgical treatment paired with medical management is imperative for the eradication of the causative organism in atypical hand infections [5]. Initial treatment for mycobacterial infections in the hand and wrist involves a combination of long-term antibiotics and surgical debridement to cure the infection [6]. Management of osteomyelitis of the hand and wrist should consist of a combined surgical and medical approach to achieve the most favorable outcome [30].
Surgical Approach / Technique: Prompt diagnosis and early treatment with broad-spectrum intravenous antibiotics and surgical irrigation and debridement are essential to avoid complications and preserve hand function in pyogenic flexor tenosynovitis [16]. Severe pyogenic flexor tenosynovitis can still lead to impaired function or amputation despite prompt treatment [16]. The rising incidence of virulent and MRSA infections emphasizes the need for aggressive treatment in immunosuppressed patients to prevent limb and life-threatening complications [18].
Empiric Antibiotic Selection: The choice of empiric antibiotics for acute infections of the hand should be based on the severity of the infection [13]. The choice of empiric antibiotics for acute infections of the hand should be based on the comorbidities of the patient [13]. The choice of empiric antibiotics for acute infections of the hand should be based on local prevalence of MRSA [13].
Complications¶
The complications associated with mycobacterial hand infections can be significant [10]. There is a rising incidence of virulent and MRSA infections in hand surgery [18]. Since 1961, the rates of both community-acquired MRSA and health care–associated MRSA hand infections have increased rapidly [38]. The incidence of finger infections presenting to emergency departments is rising, with 40- to 59-year-old patients most at risk [19].
Infection: HIV infection increases the risk of developing a hand infection but does not lead to an increased risk of revision surgery or ablation [35]. Immunosuppressed patients require aggressive treatment to prevent limb and life-threatening complications [18].
Other Considerations: The demographic shift toward 40- to 59-year-old patients represents a key risk profile for emergency department presentations of finger infections [19].
Recovery¶
Light activity (weeks): Specific week ranges for light activity are not provided in the current evidence base.
Full activity (months): Specific month ranges for full activity are not provided in the current evidence base.
Complete recovery / outcome plateau (months): Specific month ranges for complete recovery are not provided in the current evidence base.
Rehabilitation protocol: Management of hand osteomyelitis requires good surgical debridement and culture-guided antimicrobial therapy [3]. For atypical hand infections, early identification through appropriate laboratory testing and surgical treatment paired with medical management is imperative for eradication of the causative organism [5]. Initial treatment of mycobacterial infections in the hand and wrist involves a combination of long-term antibiotics and surgical debridement to cure the infection [6]. Prophylactic antibiotics are indicated for hand procedures lasting longer than 2 hours, contaminated wounds, and open fractures [7].
Functional milestones: Severe pyogenic flexor tenosynovitis can lead to impaired function or amputation despite timely and thorough treatment [16, 31]. Complications associated with mycobacterial hand infections can be significant [10].
Other Considerations: The incidence of finger infections presenting to emergency departments in the United States was rising from 2012 to 2016, with patients aged 40 to 59 years being most at risk [19]. Factors including time to antibiotics, time to operative debridement, smoking status, and chronic disease comorbidities were not predictive of infection or nonunion in open hand fractures [45]. Early amputation to maximize disease-free survival may be appropriate for patients with hand osteomyelitis and arterial calcification [47]. Regarding pin site care in adult hand and wrist surgery, a protocol from Ilizarov confirms a very high wire survival rate (99.5%) and a very low rate of pin site infection (4.5%) [15]. There were no cases of bony infection requiring further surgery in the study supporting this protocol [15]. The study supports the recommendation to leave wires exposed in adult hand and wrist surgery when the specific Ilizarov protocol is adopted [15].
Key Evidence¶
- [L5] Early identification and treatment of hand infections are essential to achieve optimal outcomes, as delayed diagnosis can result in amputation or death. [1] (10.1016/j.jhsa.2018.05.027)
- [L5] Hand infections are associated with a high rate of complications that are often difficult to manage. [2] (10.1016/j.hcl.2020.03.010)
- [L5] Management principles include good surgical debridement and culture-guided antimicrobial therapy, with antibiotic therapy typically lasting 4–6 weeks, though the optimal length and mode of administration in the hand remain under study. [3] (10.1177/1753193415612373)
- [L5] Hand and upper-extremity infections are usually a clinical diagnosis, but imaging and laboratory evaluation aid in diagnosis. [4] (10.1016/j.hcl.2020.03.002)
- [L4] Atypical hand infections are difficult to recognize and treat due to their indolent nature and nonspecific symptoms; early identification through appropriate laboratory testing and surgical treatment paired with medical management is imperative for eradication of the causative organism. [5] (10.1016/j.jhsa.2025.09.023)
- [L5] Initial treatment involves a combination of long-term antibiotics and surgical debridement to cure the infection, with reconstructive procedures aiding in restoring hand function lost secondary to the disease process. [6] (10.1016/j.hcl.2020.03.013)
- [Paper] Deep infection after hand surgery is uncommon but can lead to significant morbidity; prophylactic antibiotics are indicated for procedures lasting longer than 2 hours, contaminated wounds, and open fractures, while their use in small elective soft tissue procedures is debated and often not necessary. [7] (10.1016/j.hcl.2014.12.007)
- [L5] Chronic hand infections are uncommon and require a high index of suspicion for early diagnosis; they are grouped by microorganism into bacterial (mycobacterial and others), fungal, and viral types, with specific presentations and treatments emphasized for each. [9] (10.1016/j.jhsa.2014.04.003)
- [L4] The complications associated with mycobacterial hand infections can be significant. [10] (10.1177/1558944720940064)
- [L5] Hand infections include a diverse array of entities with potential for serious morbidity. [11] (10.1016/j.jhsa.2011.05.035)
- [L5] Prompt diagnosis, surgical debridement, and antibiotic coverage remain the standard of care for hand infections, though challenges persist with immunosuppressed patients and intravenous drug use. [12] (10.1016/j.hcl.2020.03.001)
- [L5] The choice of empiric antibiotics for acute infections of the hand should be based on the severity of the infection, the comorbidities of the patient, and local prevalence of MRSA. [13] (10.1016/j.jhsa.2009.10.024)
- [L5] A high index of suspicion coupled with an excellent knowledge of hand anatomy and function allows for an accurate diagnosis and effective management of deep space infections. [14] (10.1016/j.hcl.2020.03.014)
- [L4] The study confirms a very high wire survival rate (99.5%) and a very low rate of pin site infection (4.5%) with no cases of bony infection requiring further surgery, supporting the recommendation to leave wires exposed in adult hand and wrist surgery when this specific protocol is adopted. [15] (10.1177/1753193421991318)
- [L5] Prompt diagnosis and early treatment with broad-spectrum intravenous antibiotics and surgical irrigation and debridement are essential to avoid complications and preserve hand function, though severe infection can still lead to impaired function or amputation. [16] (10.1016/j.jhsa.2019.04.011)
- [L5] Prompt diagnosis and early treatment are necessary to prevent complications such as hand stiffness, contractures, and amputation. [17] (10.1016/j.jhsa.2014.03.031)
- [L3] The study demonstrated a rising incidence of finger infections presenting to EDs, with 40- to 59-year-old patients most at risk. [19] (10.1177/1558944720915614)
- [L3] [20] (10.1186/s13018-023-03911-5)
- [L5] Early diagnosis and prompt treatment are required to preserve the digit and prevent morbidity and loss of hand function. [22] (10.1016/j.hcl.2020.03.005)
- [L5] Fungal infections of the hand are most commonly cutaneous infections involving the skin and nails and can be treated with topical or local therapy. [23] (10.1016/j.hcl.2020.03.009)
- [Paper] This review seeks to direct clinicians in an evidence-based manner, to make them aware of more obscure conditions that can mimic common infections, and to provide an understanding of the relevant anatomy of the fingertip. [24] (10.1016/j.hcl.2020.03.004)
- [L5] Although many management principles are the same in pediatric and adult patients, physicians should bear in mind the unique environments and characteristics of the pediatric hand, including the frequency of fingers in mouths, open growth plates, and typically more robust circulation with fewer systemic comorbidities. [25] (10.1016/j.hcl.2020.03.012)
- [L3] [26] (10.1177/15589447221092058)
- [L5] Diagnosis is made based mainly on a thorough patient history, physical examination, and joint aspiration, as no serum laboratory values have been shown to consistently confirm wrist joint infection. [27] (10.5435/jaaos-d-16-00414)
- [L2] Our prospective multicenter trial showed no significant difference in infection rate in elective hand surgery whether antibiotics were administered preoperatively or not. [28] (10.1177/1558944719842238)
- [L3] An initial debridement of dorsal hand infections at the bedside is at least as effective as formal debridement in the operating room, decreasing the number of formal debridements and hospital days without increasing complications. [29] (10.1177/1558944719836234)
- [L5] Management of osteomyelitis of the hand and wrist should consist of a combined surgical and medical approach to achieve the most favorable outcome. [30] (10.1016/j.jhsa.2009.03.020)
- [Paper] Despite timely and thorough treatment, severe infection can nevertheless lead to impaired function or even amputation of the affected digit. [31] (10.1055/s-0039-1700370)
- [L4] Outpatient management of diabetic hand infections provides a safe alternative to inpatient admission in selected patients. [33] (10.1177/17531934231196026)
- [L3] The new classification system divides patients into three groups based on a risk score to predict infection requiring re-debridement. [34] (10.1177/17531934231187553)
- [L3] HIV infection increased the risk of developing a hand infection but did not lead to an increased risk of revision surgery or ablation. [35] (10.1177/1753193420977791)
- [L4] [37] (10.5435/jaaos-d-17-00716)
- [L5] Since 1961, the rates of both community-acquired MRSA and health care–associated MRSA hand infections have increased rapidly. [38] (10.1016/j.hcl.2020.03.003)
- [L4] Diagnosis of upper-extremity NTMI is often delayed because of indolent presentation and lack of clinical suspicion. [44] (10.1016/j.jhsa.2017.10.030)
- [Paper] Factors including time to antibiotics, time to operative debridement, smoking status, and chronic disease comorbidities were not predictive of either infection or nonunion in open hand fractures. [45] (10.1055/s-0039-3399488)
- [L4] Early amputation to maximize disease-free survival may be appropriate for patients with hand osteomyelitis and arterial calcification. [47] (10.1177/1753193420981871)
- [L3] Hence, animal bite injuries of the hands should be treated immediately to avoid further complications. [48] (10.1007/s00402-020-03443-1)
- [L4] The cases educate key stakeholders, raise awareness of the diagnosis, and illustrate challenging aspects of managing these patients, including special functional and anatomical considerations essential in managing cases involving the hand. [49] (10.1177/1558944719846599)
- [L2] Complications of the fingers and hand after arthroscopic rotator cuff repair easily occurred in patients with a past history of carpal tunnel syndrome or tenosynovitis and in patients with edema as per a subjective assessment. [51] (10.1016/j.jseint.2021.07.001)
References¶
[1] Hand Infections. The Journal of Hand Surgery. 2019. DOI: 10.1016/j.jhsa.2018.05.027
[2] Complications of Hand Infections. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.010
[3] Osteomyelitis of the hand. Journal of Hand Surgery (European Volume). 2015. DOI: 10.1177/1753193415612373
[4] Imaging and Laboratory Workup for Hand Infections. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.002
[5] Atypical Hand Infections. The Journal of Hand Surgery. 2026. DOI: 10.1016/j.jhsa.2025.09.023
[6] Mycobacterial Infections in the Hand and Wrist. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.013
[7] Infection After Hand Surgery. Hand Clinics. 2015. DOI: 10.1016/j.hcl.2014.12.007
[9] Chronic Hand Infections. The Journal of Hand Surgery. 2014. DOI: 10.1016/j.jhsa.2014.04.003
[10] Mycobacterial Infections of the Hand. HAND. 2020. DOI: 10.1177/1558944720940064
[11] Hand Infections. The Journal of Hand Surgery. 2011. DOI: 10.1016/j.jhsa.2011.05.035
[12] Hand Infections. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.001
[13] Empiric Antibiotics for Acute Infections of the Hand. The Journal of Hand Surgery. 2010. DOI: 10.1016/j.jhsa.2009.10.024
[14] Hand Abscesses. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.014
[15] Reducing the incidence of pin site infection in hand surgery with the use of a protocol from Ilizarov. Journal of Hand Surgery (European Volume). 2021. DOI: 10.1177/1753193421991318
[16] Pyogenic Flexor Tenosynovitis: Evaluation and Treatment Strategies. The Journal of Hand Surgery. 2019. DOI: 10.1016/j.jhsa.2019.04.011
[17] Acute Hand Infections. The Journal of Hand Surgery. 2014. DOI: 10.1016/j.jhsa.2014.03.031
[18] Chapter 30 Bone and Soft-Tissue Infections of the Hand and Wrist. 2020.
[19] A Nationwide Epidemiological Analysis of Finger Infections Presenting to Emergency Departments in the United States From 2012 to 2016. HAND. 2020. DOI: 10.1177/1558944720915614
[20] Renal disease and diabetes increase the risk of failed outpatient management of cellulitic hand infections: a retrospective cohort study. Journal of Orthopaedic Surgery and Research. 2023. DOI: 10.1186/s13018-023-03911-5
[22] Pyogenic Flexor Tenosynovitis: Evaluation and Management. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.005
[23] Fungal Infections of the Hand. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.009
[24] Fingertip Infections. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.004
[25] Pediatric Hand Infections. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.012
[26] Contrast Enhanced Computed Tomography in the Diagnosis of Acute Pyogenic Flexor Tenosynovitis. HAND. 2022. DOI: 10.1177/15589447221092058
[27] Septic Arthritis of the Wrist. Journal of the American Academy of Orthopaedic Surgeons. 2018. DOI: 10.5435/jaaos-d-16-00414
[28] Prospective Analysis of Hand Infection Rates in Elective Soft Tissue Procedures of the Hand: The Role of Preoperative Antibiotics. HAND. 2019. DOI: 10.1177/1558944719842238
[29] Initial Debridement of Dorsal Hand Abscesses in the Operating Room Does Not Improve Outcomes. HAND. 2019. DOI: 10.1177/1558944719836234
[30] Current Recommendations in the Management of Osteomyelitis of the Hand and Wrist. The Journal of Hand Surgery. 2009. DOI: 10.1016/j.jhsa.2009.03.020
[31] Pyogenic Flexor Tenosynovitis: Evaluation and Treatment Strategies. Journal of Hand and Microsurgery. 2019. DOI: 10.1055/s-0039-1700370
[33] The incidence and severity of diabetic hand infection presentations during the COVID-19 pandemic. Journal of Hand Surgery (European Volume). 2023. DOI: 10.1177/17531934231196026
[34] Open fractures of the hand: a new classification based on risk score to predict infection requiring re-debridement. Journal of Hand Surgery (European Volume). 2023. DOI: 10.1177/17531934231187553
[35] Factors affecting suboptimal outcomes in hand infections. Journal of Hand Surgery (European Volume). 2020. DOI: 10.1177/1753193420977791
[37] Necrotizing Infections of the Hand and Wrist: Diagnosis and Treatment Options. Journal of the American Academy of Orthopaedic Surgeons. 2020. DOI: 10.5435/jaaos-d-17-00716
[38] Antibiotic Management and Antibiotic Resistance in Hand Infections. Hand Clinics. 2020. DOI: 10.1016/j.hcl.2020.03.003
[44] Nontuberculous Mycobacterial Infections of the Upper Extremity: 15-Year Experience at a Tertiary Care Medical Center. The Journal of Hand Surgery. 2018. DOI: 10.1016/j.jhsa.2017.10.030
[45] Factors Influencing Infection Rates after Open Hand Fractures. Journal of Hand and Microsurgery. 2020. DOI: 10.1055/s-0039-3399488
[47] Hand osteomyelitis in arterial calcification, diabetes mellitus and end-stage renal failure: a comparison of 210 cases over 12 years. Journal of Hand Surgery (European Volume). 2021. DOI: 10.1177/1753193420981871
[48] “Cat and dog bite injuries of the hand: early versus late treatment”. Archives of Orthopaedic and Trauma Surgery. 2020. DOI: 10.1007/s00402-020-03443-1
[49] Chronic Recurrent Multifocal Osteomyelitis of the Hand: A Rare Pediatric Condition. HAND. 2019. DOI: 10.1177/1558944719846599
[51] Risk factors related to complications of the fingers and hand after arthroscopic rotator cuff repair – carpal tunnel syndrome, flexor tenosynovitis, and complex regional pain syndrome. JSES International. 2021. DOI: 10.1016/j.jseint.2021.07.001