- Research article
- Open Access
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Induced membrane technique for the treatment of chronic hematogenous tibia osteomyelitis
BMC Musculoskeletal Disorders volume 18, Article number: 33 (2017)
Chronic hematogenous osteomyelitis often results from the improper treatment of acute hematogenous osteomyelitis. At present, there is lack of uniform standards for the treatment, and the clinical features of the disease are unclear. The purpose of this study was to explore the clinical efficacy and complications of chronic hematogenous tibia osteomyelitis treated with the induced membrane technique.
A retrospective analysis of the chronic hematogenous tibia osteomyelitis patients in our department admitted from January 2013 to February 2014 and treated with the induced membrane two-stage surgical technique was performed. The defects were filled with antibiotic-loaded polymethyl methacrylate (PMMA) cement after radical debridement, and bone grafts were implanted to repair the defects after 6 to 8 weeks.
A total of 15 cases were admitted in this study, including 13 men and 2 women with a mean age of 34 years (6 to 51). The mean duration of bone infection was 142 months (3 to 361). All patients were cured with an average follow-up of 25 months (24 to 28). Radiographic bone union occurred in 5.3 months (3 to 8), and full weight bearing occurred in 6.7 months (4 to 10). No recurrence of infection was noted at the last follow-up. Two cases required repeated debridement before grafting due to recurrent infection. One patient had a small bone diameter due to insufficient grafting, and one patient had limitation of knee activity.
The induced membrane technique for the treatment of chronic hematogenous tibia osteomyelitis is an effective and reliable method. Thorough debridement and wound closure at the first stage is essential for infection control as well as sufficient grafting at the second stage to ensure bone union.
Any form of inflammation involving bone tissue or marrow caused by a pathogenic organism is called osteomyelitis . The condition mostly occurs at the metaphyseal of immunocompetent patients . Hematogenous osteomyelitis is rare in developed countries but remains a serious problem in less developed regions. Chronic hematogenous osteomyelitis mainly occurs in long bones. In a rural African setting, tibia osteomyelitis was noted in 21.6% of these patients . Adult hematogenous osteomyelitis was mostly persistent from childhood . Blood flow is slower at the growth bone site, so the bacteria deposited cause acute osteomyelitis . If not treated in time or with improper treatment, the condition will persist and become chronic osteomyelitis. Although great progress has made in the treatment of osteomyelitis, there is no standard for clinicians to use. According to our knowledge, few reports on the treatment of chronic hematogenous tibia osteomyelitis are available, and the characteristics of the disease are unclear. In recent years, Masquelet reported  a two-stage surgical method for the treatment bone defects, which is called induced membrane technique, and acquired great success. This technique is recognized and used in the treatment of osteomyelitis . We reported the use of the induced membrane technique for the treatment of 32 cases post-traumatic osteomyelitis and obtained good clinical efficacy . Here, we performed a retrospective analysis of 15 patients with chronic hematogenous tibia osteomyelitis treated with the induced membrane two-stage surgical technique to assess the clinical outcome and provide a reference for this disease.
After approval by the Ethics Committee, we retrospectively analyzed chronic hematogenous tibia osteomyelitis patients in our department from January 2013 to February 2014. The inclusion criteria were (1) historical evidence of radiological and clinical bone infection at the tibia; (2) no historical evidence of open fracture or fracture internal fixation at the involved site; (3) local bone pain and swelling on examination, imaging procedures, microbiology and histopathology, and laboratory studies . The gold standard for diagnosis of osteomyelitis is biopsy or culture from deep tissue  frozen sections confirmed to have more than five neutrophils per high-power field. Those with insufficient information or with Cierny-Mader C stage, which is inoperable, were excluded. We collected the patient's age, sex, Cierny-Mader host stages, duration of bone infection, culture, fixation and grafting type by patient record systems.
Seventeen cases were treated with this technique, and two were excluded due to incomplete information. Thus, a total of 15 patients were reviewed (Table 1), including 13 men and 2 women with a mean age of 34 years (6 to 51). The mean duration of bone infection was 142 months (3 to 361). Six (40%) cases had a history of collision, and 11 (73.3%) patients were younger than 20 years old at their initial onset. There were 6 cases in the proximal tibia, 7 cases in the middle tibia, and 2 in the distal tibia. No patient had diabetes, immune deficiency diseases or peripheral vascular diseases. Two cases were classified as Cierny-Mader type II, 8 cases as type III and 5 cases as type IV. Eleven cases had draining sinus tracts or local redness and swelling, and the remaining 4 cases had a history of osteomyelitis. The main clinical manifestations were long-term pain at the involved site, and radiological examination revealed bone destruction. Nine patients had bacterial cultures containing 11 strains, including 4 strains of Staphylococcus aureus, 2 Proteus, 1 Enterobacter cloacae, 1 Micrococcus luteus, 1 hemolytic Staphylococcus, 1 fecal Enterococcus 1 Klebsiella oxytoca.
All patients were treated with the induced membrane technique. The defects were filled with antibiotic-loaded PMMA cement after radical debridement at the first stage. Then, bone graft was implanted to rebuild bone defects at the second stage. The range of debridement was determined with preoperative X-ray, CT, MRI and bone scintigraphy examinations [10, 11]. The sinus was removed, and the sequestrum was cleaned. Surrounding necrosis tissue and scar tissue should be removed because it causes tension, decreases the rate of wound healing, and acts as foci for infection . The sequestrum and surrounding tissues are used for culture and pathological examination. The bone ends are subject to grinding until signs of bleeding, and the medullary cavity is reamed. The wound is washed with hydrogen peroxide, dilute povidone-iodine and saline repeatedly. After effective fixation, the defects are filled with 40 g PMMA cement (Heraeus, Germany) mixed with 5 ~ 10 g vancomycin (Eli Lilly, Japan). The cement should be packed in the bone ends and not be smaller than the diameter of the tibia. If internal fixation is used, the cement should wrap the bone. Then, suction drainage tubes are inserted, and the wound is closed. A local or distant flap will be useful for high skin tension. If infection recurs, repeated debridement was performed until the infection was controlled. Intravenous injections of sensitive antibiotics are administered for two weeks postoperatively based on the drug sensitivity tests. If the culture is negative, a third generation cephalosporin (Ceftazidime, Hailin, China) is administered at a dose of 2 g per 12 h. Suction drainage is performed for 10 ~ 12 d. Weight-bearing should not be performed between the first and second stages.
Grafting was performed 6 to 8 weeks later, with a mean interval time of 50 days (44 to 105). The situation of infection control should be assessed before grafting, including the presentation of signs, such as redness, sinus and pus, or abnormal laboratory tests, such as erythrocyte sedimentation rate, CRP and white blood cell count. These indicators could reveal recurrent infection, which requires debridement until the infection is under control. The amount of the graft is estimated based on CT measurement before surgery . The cement is removed, and the canals are reamed. The wound is washed. The graft is cut to 0.5 cm × 0.5 cm × 0.5 cm in size. The induced membrane is grafted and sutured. Prophylactic antibiotics are administered for 24 h, and suction drainage is applied for 10 ~ 12 days.
Patients underwent follow-up at 1, 2, 3, 6, 9, 12, 18, and 24 months. We assessed the time to bone healing, infection control, local pain, range of knee movement, lower limb edema, ability to walk and other complications. Gradual ambulation until callus was observed. Our clinical endpoints were 24 months after the second stage until infection control and the X-ray scan revealed bone union. CT scans were performed when X-ray did not clearly indicate bone union. We defined radiographic healing as bridging callus on three of four cortices and clinical healing as pain-free full weight bearing .
The average volume of bone defects was 51.3 cm3 (20 to 84 cm3) after debridement. Three patients were implanted with autografts, 6 with autograft plus variable proportion of allograft and 5 with allograft for more than 25% of the total volume. Five children and one adult were implanted with allograft only. At the first stage, external fixations were used in 8 cases, 5 cases with internal fixation, five cases were replaced with nail at the second stage, and 2 cases with no fixation.
All the patients achieved bone union within the mean follow-up of 25 months (24 to 28), and no infection recurrence was noted. The mean radiographic bone union occurred in 5.3 months (3 to 8), and painless weight bearing was noted at 6.7 months (4 to 10). A comparison of the bone union time of three groups (allograft, allograft + autograft and autograft) did not reveal statistically significant differences (Table 2). Two patients required repeated debridement before grafting due to recurrent infection. Two cases with pin tract infection were noted when external fixation was used. Infection was controlled after the removal of the screw and topical sterilization. Four cases had dull pain or edema of the leg after activity. We recommended the use of symptomatic treatment and elastic stockings to reduce edema. Four cases had donor site pain and discomfort. One case had a small tibia diameter at the defect site (Fig. 1). One case had limitation of knee limb activity (0–85°). After an average of 25 months of follow-up, we observed no infection recurrence, and no lasting damage to bone was noted in all patients. Typical cases are presented in Fig. 2.
Chronic osteomyelitis is a serious problem for orthopedists given the lack of a generally accepted method for treatment. Classic techniques include Ilizarov technique, one stage bone grafting and vascularized fibula graft. These techniques are often associated with high complications or long-term recurrence rates [14–16]. Some reports have described the use of the induced membrane technique in the reconstruction of long bone defects, but this technique has not been specifically studied in the treatment of osteomyelitis . We applied the induced membrane technique for the treatment of chronic hematogenous tibia osteomyelitis. The process involves a series of measures, including radical debridement removal of necrotic tissue, elimination of dead space, drainage, skin covering and stable fixation for infection control. Then, a membrane is formed by implantation of a PMMA cement, and grafting the induced membrane approximately 8 weeks later. The membrane rapidly promotes bone defect repair .
Hematogenous osteomyelitis mostly occurs at the metaphyseal of children and less frequently in immunocompetent adults . Local injury is an important factor for hematogenous osteomyelitis [17, 18]. Our results revealed that 6 (40%) patients had a history of collision at the involved site. Eleven (73.3%) patients were younger than 20 years old at their first outbreak, and these results were similar to a previous study. However, four immunocompetent adults with an initial outbreak were included. Clinical symptoms of chronic osteomyelitis include blurry vision, dull pain, chills and fever . Staphylococcus aureus is the most common pathogen for bone and joint hematogenous osteomyelitis [19, 20], Staphylococcus aureus, Streptococcus and anaerobic bacteria accounted for 80% of all pathogens . However, the proportion of bacteria may be altered with the course of the migration and surgical procedures. Our results showed that 9 patients were positive for 11 strains of bacteria. Staphylococcus aureus accounted for 26.7% (4 strains) of bacteria strains. Bacteria obtained from sinus secretions may not be reliable because the pathogens are often inconsistent with the deep tissue [10, 22]. Our positive bacterial rate was only 60% (9/15) for 5-day cultures. Sheehy SH et al.  reported a 64% positive rate with a 7-day culture, so they suggested prolonging the incubation time to 14 days.
Antibiotic therapy alone can acquire good clinical efficacy for acute hematogenous osteomyelitis, but chronic osteomyelitis often requires surgery due to the presence of a sequestrum . Systemic antibiotics for osteomyelitis are generally administered for 4 to 6 weeks [25, 26]. However, this value is only based on empirical data. No study has demonstrated that 4 to 6 weeks of antibiotics can be more effective [10, 27]. Salgado reported the use of muscle versus non-muscle flaps for the treatment of chronic tibia osteomyelitis in animals, antibiotics for 5 days postoperatively, and no recurrence of infection within 1-year follow-up . Knopp  reported 47 cases of chronic osteomyelitis, and intravenous antibiotics were administered for 3 to 5 days with an infection control rate of 85%. We used intravenous antibiotic therapy for approximately 2 weeks after the operation. No oral antibiotics were used given that radical debridement can disrupt bacterial biofilm formation, reduce bacterial load, improve the local blood supply, and enhance the efficiency of antibiotics. All of these measures prevent the further formation of bacterial biofilm and reduce the incidence of systemic adverse reactions . If the surgeon is confident of thorough debridement, a shorter antibiotic time can be selected. If the skin and soft tissue conditions permit, we can also choose internal fixation, such as open fracture (contaminated wound), but the surface of the plate should be wrapped with bone cement. Bhaskar Borgohain  reported on an 8-year-old child. In this case, sequestrum disappeared with intravenous antibiotics and supportive treatment for 8 months without surgical intervention, but the shorter follow-up may exclude long-term infection recurrence.
The classic technique for the treatment of chronic osteomyelitis is often accompanied by complications. Muscle flap to fill the cavity is often applied, but it may affect the aesthetic and limit the function of donor site [28, 32]. Complications for treating hematogenous osteomyelitis include myositis, soft tissue abscess, fasciitis or blood borne complications, such as DVT . Our results indicated that the complications mainly included leg edema, donor site pain and pin-track infection when external fixation was applied. Knee flexion is a limitation for proximal tibia osteomyelitis. One patient exhibited a small diameter of the tibia because the grafting affected wound closure. We reduced the volume of graft, so we recommend using a larger amount of cement compared with the corresponding diameter of the tibia at the first stage. Tibia osteomyelitis is often associated with skin defects. If large skin tension is noted after suturing, adjacent flap or skin graft can be necessary. Autograft is still the main source of the bone for this technique. Numerous studies indicated that greater than 25% bone substitute should not be added [33, 34]. Eleven (5 Autograft + Allograft and 6 Allograft) cases in our study were implanted with greater than 25% of the total volume of the allograft given that the PMMA cement induced the formation of a membrane, which is conducive to rapid healing of bone defects. We used a stem cell enrichment device to mix the autologous bone marrow with the allograft. Most patients had a partial bone defect with an increased repair ability. Children may be able to generate a periosteal membrane faster than adults , but their bone healing time was not significantly reduced in this study. This result could possibly be attributed to the fact that a greater proportion of the allograft was used for our skeletally immature patients. Formerly, we reported the induced membrane for the treatment of posttraumatic osteomyelitis . When comparing the current results with our previous study on the application of the induced membrane technique of post-traumatic osteomyelitis, we found similar clinical efficacy and complications.
The induced membrane two-stage surgical strategy for the treatment of chronic hematogenous tibia osteomyelitis is a clinically stable and reliable method. Thorough debridement and wound closure at the first stage, adequate grafting at the second stage and early functional exercises are necessary to achieve good clinical efficacy.
Deep vein thrombosis
Magnetic resonance imaging
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The Funding of State Key Laboratory of trauma, Burns and Combined Injury(SKLKF201313), and the key project of Logistics Research Plan of PLA(BWS13C014) supported the design, data collection and manuscript writing of this study. There was no funding of this study by any commercial sources.
Availability of data and materials
We are unable to share the raw data because ethical approval was not obtained for data sharing. In addition, all data are presented in the tables.
XW contributed to data collection, paper writing, data analysis, and performed surgeries. ZW contributed to data collection, data analysis, performed surgeries, and paper writing. JF contributed to data collection. KH contributed to data collection. ZX contributed to overall planning, data analysis, and performed surgeries. All authors have read and approved the final version of this manuscript.
The authors declare that they have no competing interests.
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Ethics approval and consent to participate
Ethics approval was obtained from the Southwest Hospital, Third Military Medical University Ethics Committee. All the participants had written informed consent.