Volume 25, Number 6—June 2019
CME ACTIVITY - Synopsis
Nontuberculous Mycobacterial Musculoskeletal Infection Cases from a Tertiary Referral Center, Colorado, USA
Nontuberculous mycobacteria represent an uncommon but important cause of infection of the musculoskeletal system. Such infections require aggressive medical and surgical treatment, and cases are often complicated by delayed diagnosis. We retrospectively reviewed all 14 nonspinal cases of nontuberculous mycobacterial musculoskeletal infections treated over 6 years by orthopedic surgeons at a university-affiliated tertiary referral center. All patients required multiple antimicrobial agents along with aggressive surgical treatment; 13 of 14 patients ultimately achieved cure. Four patients required amputation to control the infection. Half these patients were immunosuppressed by medications or other medical illness when they sought care at the referral center. Six cases involved joint prostheses; all ultimately required hardware removal and placement of an antimicrobial spacer for eradication of infection. Our findings highlight the importance of vigilance for nontuberculous mycobacterial musculoskeletal infection, particularly in patients who are immunosuppressed or have a history of musculoskeletal surgery.
Nontuberculous mycobacteria (NTM) are opportunistic pathogens found in soil and water and are the sources of an increasing number of infections and illness (1,2). Multiple recent studies have recognized this temporal trend of increasing annual prevalence of NTM disease; current prevalence is estimated at 2.6%–10% annually (1–4). NTM cause a broad range of clinical manifestations, depending on the immune competency of the host. Pulmonary disease is most common and is often seen in immunocompetent hosts. It is difficult to estimate the prevalence of extrapulmonary NTM infection in the United States because no system of national surveillance and reporting exists as for tuberculosis. Reported laboratory isolation data indicate that extrapulmonary disease may comprise up to one quarter of all NTM infections, although the best estimates are based on data that are 1–3 decades old. Data from the mid-1990s estimated the overall US incidence of NTM infection at 1.0%–1.8%, with ≈5% of isolates reported to the Centers for Disease Control and Infection at that time being of extrapulmonary origin. A population-based record review in Oregon that used data gathered during 2005–2006 found ≈22% of isolates originating from nonpulmonary specimens. Data from North Carolina gathered during 2006–2010 showed 16%–23% of total isolates originating from extrapulmonary specimens (5–7). Skin and soft tissue infections represent most extrapulmonary NTM disease, whereas bone and joint disease is less common. With increasing immunosuppression, NTM is more likely to manifest as disseminated disease, possibly including bone and joint involvement.
Previous case reports and series of NTM musculoskeletal infections have focused on the demographics, diagnosis, and treatment of patients with these difficult-to-manage infections (8–24). Patients were often immunocompetent persons who contracted an NTM disease after direct inoculation via traumatic skin puncture (25–28). In a series of 29 cases from South Korea, all patients required surgical intervention in addition to antimicrobial drugs; 3 patients failed to respond despite aggressive treatment, and an additional 4 were lost to follow-up. Of note, only 20 of the patients in this series received NTM-specific antimicrobial therapy; the remainder were treated with empirical antimicrobial therapy. A series of 28 cases of M. marinum musculoskeletal infections found that 93% of cases involved fingers or hands and 87% were related to aquatic exposure; two thirds progressed from cutaneous to invasive infection. Most cases were managed with multiple antimycobacterial agents in addition to surgery, and the series reported a 75% cure rate and 25% loss to follow-up. A study of 8 cases of prosthetic joint infection (PJI) caused by rapidly growing mycobacteria found that the median interval from prosthesis implantation to infection was 312 weeks and that all patients required either resection and explantation of infected prostheses or chronic suppressive antimicrobial therapy.
In these series, infections occurred throughout the musculoskeletal system but were particularly common in the hands and spine. Identification of NTM as the causative agent was often delayed due to the indolent course of the infection and lack of appropriate diagnostic testing. Once identified, the infections could be treated effectively with a combination of debridement and conventional antimycobacterial chemotherapy.
We reviewed all cases of nonspinal NTM musculoskeletal infection treated at the University of Colorado Hospital (UCH; Aurora, CO, USA) over a 6-year period by a multidisciplinary team of providers at UCH and National Jewish Health (NJH; Denver, CO, USA), a renowned center for mycobacterial research and treatment that receives referrals for difficult-to-treat NTM infections from across the United States. Our aim was to describe the clinical characteristics and treatment outcomes of patients with NTM musculoskeletal infections.
We performed a retrospective study of patients with nonspinal NTM musculoskeletal infections treated at UCH during 2009–2015. The management of each case was directed by an orthopedic surgeon and infectious disease physicians at UCH and NJH. For patients with positive culture results at UCH, mycobacterial speciation and susceptibility data were identified by ARUP Laboratories (https://www.aruplab.com) using DNA sequencing or matrix-assisted laser desorption/ionization time-of-flight mass spectrometry.
We identified all cases of nonspinal NTM musculoskeletal infections treated by orthopedic surgeons at UCH during the study period using a registry of NTM musculoskeletal infections. We omitted spinal cases because they are handled by a different department at UCH and so were not part of the surgeons’ personal registry. We reviewed the medical records of patients after approval from the Institutional Review Board.
We performed our review of the medical records using a standardized case report form. We collected demographic characteristics and data on concurrent conditions, laboratory values, surgical intervention, antimycobacterial chemotherapy, and outcomes.
We searched the Medline database to identify case reports and reviews of NTM musculoskeletal infections. We used both the PubMed and Ovid access tools.
Of the 14 patients in our series, 7 were receiving immunosuppressive medications at arrival, and 5 of those had chronic autoimmune disease. Twelve patients were referred from NJH. No predisposing host factor was identified for 6 patients. (Table 1).
Clinical Presentation and Diagnosis
The patients had a wide array of sites of infection when they sought care at UCH (5 knee, 2 hip, 1 thigh, 1 hand, 1 foot, 1 elbow, 3 with disseminated disease at multiple sites). The diagnosis at arrival was most commonly PJI (n = 6); the next most common diagnoses included septic arthritis (n = 5), osteomyelitis (n = 3), tendon sheath infection (n = 2), skin abscess (n = 2), cellulitis (n = 2), and surgical-wound infection (n = 1). Several patients had complex local infections with multiple concurrent tissue diagnoses; case-patients 1, 7, and 8 had disseminated disease at multiple sites. Each patient had undergone >1 prior procedure at the site of infection, including 6 patients with infected prostheses, 4 with other surgical procedures, 2 with steroid injection, 1 with a failed intravenous (IV) placement, and 1 with a cosmetic pedicure. The median interval from symptom onset to diagnosis was 7.5 months (range 1–19 months).
Of 10 patients tested, the median erythrocyte sedimentation rate (ESR) was above the upper limit of normal (ULN) in 7 patients (70%) at arrival (ULN 15 mm/h in men, 20 mm/h in women). C-reactive protein level was elevated in 4/14 patients (29%) (ULN 10.0 mg/L). Blood leukocyte count was elevated in 2/14 patients (14%) (ULN 10.1 × 104 cells/μL). All 3 laboratory tests were within reference limits in 1 patient, and both C-reactive protein and leukocyte levels were within reference limits in an additional 2 patients without ESR data.
Six patients arrived with PJI at the knee (4 patients) and hip (2 patients). The interval from prosthesis implantation to symptom onset ranged from the immediate aftermath of implantation to 25 years postimplantation; median duration was 6 months. Infected hardware was removed in all patients with PJI; the median period from symptom onset to explantation was 8.5 months (range <3–16 months). After explantation, 2-stage revision was undertaken, first with implantation of a temporary articulating prosthesis prepared with 1 g of antimicrobial-loaded polymethylmethacrylate bone cement, with drug selection based on sensitivity testing. This preparation, called an antimicrobial spacer, was subsequently replaced with a permanent prosthesis after several months without evidence of recurrent infection. Medication-loaded bone cement was also used for patients requiring intramedullary nailing. Patients with PJI were also treated with amikacin-containing calcium sulfate beads implanted within the surgical bed (1 g of amikacin per 10 cc packet of calcium sulfate mixture). These antimicrobial beads were used at initial explantation or when the antimicrobial spacer was replaced with a permanent prosthesis at the discretion of the surgeon as needed to fill dead space from aggressive debridement or the infection itself. The precise amount of amikacin used is not always clearly reflected in the surgical record; however, in our series, use of up to 5 g of amikacin has been recorded. Amikacin is used for its activity against mycobacteria and its ability to integrate with the calcium sulfate material to form beads. Such amikacin-laden beads were also used in 2 other patients with extensive soft-tissue involvement. A seventh patient with septic arthritis of her native knee (case-patient 8) underwent a total knee arthroplasty that was insufficient to eradicate the infection and ultimately required subsequent 2-stage revision.
All patients required surgical treatment for control of infection, and all but 1 patient were ultimately cured by combined medical and surgical treatment. Seven patients had >1 procedure at outside hospitals before seeking treatment at UCH. Case-patients 4 and 5 required only a single surgical procedure at UCH for control of infection. Case-patients 6 and 12 underwent planned 2-stage revision and required no further surgeries. The remaining 10 case-patients had initial procedures at UCH that were intended to definitively treat infection but proved unsuccessful. Surgical treatment at UCH consisted of aggressive debridement of infected bone and soft tissue, as well as explantation of any infected hardware with 2-stage revision of infected prostheses. Four patients with infections involving the knee also required placement of intramedullary nails coated with antibiotic-loaded cement (case-patients 9, 10, 11, and 13). The median interval from initial diagnostic or therapeutic procedure to definitive surgical treatment was 14 months (range 4–52 months) in the patients who required multiple procedures. One patient with disseminated M. abscessus (case-patient 1) required a debridement of the femur, partial claviculectomy, synovectomy of an ankle and a knee, and a fasciectomy. The patient with disseminated M. massiliense in the setting of chronic immunosuppressive therapy (case-patient 7) required >12 procedures including multiple debridements and soft tissue excisions, removal of infected ankle fusion hardware, and osteotomy and arthrotomy of an infected elbow with extensive use of antimicrobial beads and bone cement. A patient with M. intracellulare infection disseminated to the left knee and right hip (case-patient 8) required multiple irrigations and debridements, total knee arthroplasty with antimicrobial spacer, and subsequent implantation of a tumor prosthesis. One patient with M. fortuitum infection (case-patient 5) had a debridement and eventually required amputation of her hand. One patient had cellulitis and abscess formation caused by M. marinum (case-patient 14) requiring a wide excision of the soft tissue around her elbow. One patient with a hip-prosthetic infection caused by M. abscessus (case-patient 3) required hemipelvectomy due to the progressive spread of the infection despite >1 year of intravenous therapy, prosthetic hip explantation, and multiple debridements (Table 2).
Histopathology and Microbiology
The species of NTM responsible for the musculoskeletal infection was known or identified in each patient. All patients had tissue specimens taken for culture during their procedure(s) at UCH. Eight patients had microbiologic diagnoses of NTM infection before transfer to UCH, and 6 of these patients were culture-negative at the time of surgery at UCH (case-patients 1, 2, 4, 8, 9, and 13). Antimicrobial therapy was initiated at outside hospitals in 6 of the 8 patients who came to UCH with established microbiologic diagnoses; the other 2 patients were referred directly to infectious diseases specialists at UCH, NJH, or both for treatment.
Seven patients were infected with a rapidly growing mycobacterial species, whereas the remaining 7 were infected with slowly growing species (Table 1). Ten patients had intraoperative biopsy specimens demonstrating granuloma formation, but only 2 of these had evidence of acid-fast bacilli on direct microscopy. Eight of 14 patients had intraoperative cultures that grew NTM, with speciation consistent with prior data when available. All patients had visual evidence of infection at the time of operation. One patient who had M. marinum worked at a pet store that sold fish and aquariums and frequently submerged her hands and arms in the water, and her infection originated at a failed IV site. In the 5 patients with M. avium complex, 3 had speciation available that identified M. intracellulare.
All patients were treated with combination antimycobacterial chemotherapy (Table 3) determined on the basis of antimicrobial drug sensitivities (Appendix Table) and recommendations from NJH. Thirteen of 14 patients were receiving antimycobacterial therapy at the time of surgery based on previous culture and drug susceptibility test results. Antimicrobial therapy was not administered around the time of surgery for case-patient 7 because of adverse effects from these medications.
Amikacin-related toxicity occurred in 3 patients. Ototoxicity occurred in 2 patients: case-patient 1 reported hearing loss after 9 months of parenteral amikacin and within 1 month of implantation of amikacin beads, and case-patient 6 experienced tinnitus after 3 months of parenteral amikacin. Kidney injury occurred in case-patient 7 after 3 months of parenteral amikacin and 1 month after implantation of amikacin beads (creatinine level increased from 0.71 to 2.37 mg/dL). Tigecycline was also discontinued in case-patient 7 due to intractable nausea and vomiting within 2 days of initiation, and cefoxitin was discontinued due to fever within 3 days of treatment. Clofazimine also caused intractable nausea and vomiting upon initiation in this patient and was discontinued after 1 month. Apart from case-patient 1, who experienced permanent hearing loss, toxicity resolved with discontinuation of medications. Two patients with M. avium complex infection did not receive amikacin due to history of C. difficile infection (case-patients 10 and 11).
The median duration of antimicrobial chemotherapy was 14 months (range 2–39 months). Among the 7 patients with rapidly growing NTM, the median duration was 6 months. The median duration was longer in patients with slow-growing NTM, at 14 months. Twelve patients received injectable antimicrobial drugs as part of their treatment regimen, whereas 2 patients had oral therapy alone. The median duration of therapy with injectable agents was 5 months; rapidly growing strains were treated for a median of 6 months and slow-growing strains for a median of 5 months. The median duration of antimicrobial drug therapy after definitive surgery was 2 months. Patients infected with slow-growing NTM received a more protracted course of postoperative antimicrobial therapy, with a median duration of 5 months, compared with <1 month in patients infected with rapidly growing strains.
During the follow-up period after surgical intervention (median duration 20 months, range 1–60 months), 13/14 patients did not develop clinical or microbiological relapse and were cured. One (case-patient 7) had clinical and microbiological relapse and was deemed to have failed treatment; the first relapse occurred 2 months after the first surgery to control the infection. The relapse, a disseminated infection distant from the original surgical site, was a likely result of the patient receiving multiple immunosuppressive medications to control systemic lupus erythematosus. She required 12 surgical procedures within the first year and subsequently required ≈1 procedure/year for control of chronic disseminated infection over the next 3 years, primarily in the form of debridement and excision of soft tissue mass. Of note, this patient chose to forgo antimicrobial therapy after the first 4 months of treatment because of intolerable side effects from multiple medications. Two instances of microbiologic relapse were documented for this patient.
We present a series of cases of NTM musculoskeletal infections requiring surgical intervention and antimycobacterial chemotherapy that were managed at UCH and NJH over a 6-year period. NTM musculoskeletal infections have been reported in the literature sporadically due to their rare occurrence; 2 previous case series documented 29 cases over 13 years in South Korea (27) and 8 cases of PJI by NTM over 4 decades at the Mayo Clinic in the United States (26). In a 6-year period, we have identified 14 case-patients treated at our institutions with unique characteristics, in comparison to previous studies (25–28). Specifically, the cases we report indicate the importance of a low threshold for suspicion and testing for NTM in any patient who has an unidentified musculoskeletal infection, particularly with evidence of granuloma formation on pathology. Furthermore, for all of our case-patients, NTM infections developed at the site of a prior procedure (prosthetic joint or other intervention), raising the concept of early culture for mycobacteria in conjunction with or after negative results from conventional bacterial culture.
One of the most notable findings from the 3 previous case series studying NTM musculoskeletal infections was that, in all studies, the overwhelming majority of the patients were immunocompetent (26–28). In contrast, half the patients in our study were immunosuppressed as a result of either an underlying medical condition or a medication used to treat rheumatologic disease. While this may be a manifestation of the relationship between UCH and NJH, our report highlights the importance of hypervigilance for possible NTM in immunocompromised patients with musculoskeletal infections. The most severely immunocompromised patients in our series (case-patients 1, 7, and 8) had disseminated infection. Immunocompromised patients with a history of musculoskeletal surgery should receive a mycobacterial workup as a component of their care.
Another crucial aspect of our case series is the observation that 10/14 cases occurred at the site of a previous musculoskeletal surgery and 6 of these cases involved a joint prosthesis. Moreover, all 14 cases were preceded by an invasive procedure at the initial site of infection. In all but 3 of our surgery-associated cases, the onset of symptoms occurred >3 months after the preceding surgical procedure, suggesting hematogenous spread, possibly due to transient mycobacteremia, with seeding of surgically altered tissue as the likely mechanism of inoculation. This mechanism is particularly likely in case-patients 1, 7, 8, 11, and 12, which comprise 3 cases of disseminated infection in severely immunocompromised patients and 2 late prosthetic joint infections with more than a decade between initial prosthetic joint surgery and eventual infection. The previous report from South Korea noted a minority of periprosthetic infections, but most cases were related to trauma or iatrogenic injections rather than surgery (27).
The report from the Mayo Clinic focused on PJIs but noted only 8 cases over 4 decades (26). A recent series of 6 cases of chronic trauma– or intervention-related joint infection not responding to empiric therapy reported no cases of periprosthetic NTM infection (29). Our relatively rapid accumulation of surgery-related cases over a 6-year period is due to the relationship between UHC and NJH and NJH’s high volume of NTM cases; we cannot generalize this trend to the general US population, given the unique referral characteristics of our patient population. It is possible that improvements in detection and identification of NTM infections may contribute to this increased case volume, as has been suggested to explain the increasing incidence and prevalence of pulmonary NTM (30). Regardless, infections in our study were more likely to occur at the site of a previous orthopedic surgery and in >4 cases led to severe complications requiring partial or full amputation, with 1 patient requiring hemipelvectomy. Three of these patients were infected with M. abscessus and 1 with M. fortuitum. M. abscessus is highly drug resistant and therefore responds poorly to antimicrobial therapy. It is difficult to ascertain if these amputations could have been avoided with earlier diagnosis and aggressive surgical therapy. In several cases, patients with long delays in diagnosis ultimately required amputation; almost one third of patients in our series required amputation.
Given the importance in identifying NTM musculoskeletal infections in the immunocompromised or those with prior surgery, it is unfortunate that our data did not identify more substantial diagnostic criteria based upon inflammatory markers. Whereas the ESR in our patients was usually elevated, the C-reactive protein and leukocyte counts were typically normal. The patient who failed treatment had one of the highest ESRs in our patient group, nearly double the median value of 38 at intake, perhaps because of her chronic autoimmune condition.
All patients had positive mycobacterial cultures at time of initial diagnosis. Thirteen of 14 patients were receiving mycobacterial therapy at the time of surgery at our institution and only half of them were persistently positive for mycobacterial growth despite ongoing symptoms and intraoperative observation of sinus tract formation and suppuration. We are familiar with this phenomenon, and therefore do not require a positive culture to define failure of therapy. If a patient has ongoing signs of infection while receiving effective antimicrobial drugs (based on drug sensitivity testing), then they need more aggressive resection of infected tissue. The 3 patients with PJI and rapidly growing NTM infection all required prolonged courses of IV and oral antimicrobial therapy. One of the 3 patients with M. avium complex–related PJI also required 2 months of concomitant IV amikacin. All patients with PJIs required explantation of the infected hardware followed by antimicrobial spacer placement for >3 months in addition to ongoing postoperative oral or intravenous antimicrobial therapy to achieve a successful outcome. In >5 cases, microbiologic diagnosis of mycobacterial infection was only confirmed during the initial surgical intervention, and in each of these cases, prior or subsequent surgeries were required for ultimate control of infection. Ultimately, the fact that 10/14 cases required multiple surgeries for control of infection with long intervals from onset of symptoms and initial seeking of care to identification of the infectious agent and finally definitive surgical treatment underscores the need for early identification and aggressive treatment of NTM infection.
Dr. Goldstein is a graduate of the University of Colorado School of Medicine, Aurora, CO. He will begin his residency in psychiatry at the University of North Carolina in July 2019.
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TablesCite This Article
Original Publication Date: May 17, 2019
1These first authors contributed equally to this article.
Table of Contents – Volume 25, Number 6—June 2019
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Bennie Lindeque, University of Colorado, 12631 E 17th Ave, Academic Office 1, Rm 4602, Mailstop B202, Aurora, CO 80045, USA