*Corresponding Author:
X. WangDepartment of Orthopedics, Renmin Hospital, Hubei University of Medicine, Shiyan, Hubei Province 442000, P. R. China E-mail: taodao753547@163.com
This article was originally published in a special issue,“Drug Development in Biomedical and Pharmaceutical Sciences”
Indian J Pharm Sci 2023:85(5) Spl Issue “262-269”

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as the author is credited and the new creations are licensed under the identical terms

Abstract

To evaluate the clinical efficacy of antibiotic bone cement plus lateral bone repositioning for severe diabetic foot and its impact on wound healing rate. Sixty patients with hemodialysis anemia admitted to the endocrinology department of our hospital from July 2020 to July 2021 were included and randomly assigned to receive antibiotic bone cement plus lateral bone repositioning (observation group) or vacuum sealing drainage (control group). Outcome measures included skin temperature of the affected limb, ankle-brachial index, sensory threshold, foot wound healing, dorsalis pedis artery hemodynamics, lower limb function and clinical efficacy. Antibiotic bone cement plus lateral bone repositioning resulted in significantly higher treatment efficiency and transcutaneous partial pressure of oxygen, smaller wound and lower trauma pH vs. vacuum sealing drainage, suggesting that antibiotic bone cement plus lateral bone repositioning contributes to potentiating the treatment efficacy and reducing the foot ulcer trauma, thereby facilitating rapid recovery. Patients given antibiotic bone cement plus lateral bone repositioning had larger vascular internal diameter and blood flow and better sensory conduction velocity of the common peroneal nerve and the motor conduction velocity of the tibial nerve vs. those given vacuum sealing drainage, indicating its vascular and neurological benefits. Antibiotic bone cement plus lateral bone repositioning enhances the treatment efficiency, boosts trauma healing and promotes postoperative functional recovery of patients.

Keywords

Diabetic foot, antibiotic bone cement, lateral bone repositioning, lower limb function, dorsalis pedis artery

Diabetes is a common clinical endocrine disease that may lead to a series of complications. The incidence of diabetes in China is increasing year by year, and there are currently about 120 million diabetics in China. One of the major complications of diabetes is the Diabetic Foot (DF). Studies have shown that about 1/5th of diabetic patients develop foot ulcers during the disease, and severe infection even leads to amputation, which seriously affects the quality of life and safety of diabetic patients[1,2]. DF is a refractory disease, with high morbidity, high amputation rates, high treatment costs and a mortality rate 11 % higher than that of malignant tumors. The main manifestations of DF are peripheral neuropathy, vasculopathy and infection, resulting in chronic progressive lesions of the skin, muscle, connective tissue and even bone[3], and improper management is associated with aggravated lesions or serious consequences such as foot gangrene or systemic infections. In addition, peripheral vasculopathy and nerve damage are the main pathological features of DF. Chronic neuropathy in the foot may cause foot deformity, the skin at its high pressure is prone to ulcer formation and vascular lesions induce microcirculatory disorders in the foot, resulting in trauma hypoxia and ischemia[4,5].

Active glycemic control, complete removal of necrotic tissue, prevention of local infection spread and improvement of blood supply to the affected limb are critical to the management of DF[6]. Debridement plus topical application of autologous platelet-rich plasma was mostly adopted in the early management of DF, which reduces the microorganisms in the foot ulcer wound by cleaning the infected material and increases the growth factor growth in the wound by topical application of platelet plasma, resulting in healing of the wound. However, external treatment is prone to infection, poor prognosis and recurrent episodes[7]. Data show that diabetic patients account for 40 % to 60 % of non-traumatic low amputations and 85 % are found after foot ulcers. Lower Extremity Arterial Disease (LEAD) is one of the main causes of disability and death due to foot ulcers in diabetic patients and currently, severe LEAD is mainly treated by interventional or lower extremity artery bypass graft surgery, while mild to moderate LEAD is mainly treated with medical drugs. Nonetheless, the long-term outcome leaves much to be desired[8,9].

In the 1980s, Ilizarov first proposed the tibial lateral bone repositioning procedure. To evaluate the effects of retraction rate and retraction frequency on osteogenesis during limb lengthening, different retraction rates (0.5 mm/d, 1.0 mm/d and 2.0 mm/d) and different retraction frequencies (1 step/d, 4 steps/d and 60 steps/d) were used in the tibia of the canine leg for experimental studies, in which retraction was performed to study skeletal muscle, bone tissue, smooth muscle, fascia, skin, nerves and blood vessels after open osteotomy and closed osteotomy. After nearly 20 y of development, lateral bone repositioning has achieved breakthroughs in basic research and clinical practice for the treatment of lower limb ischemic diseases[10-12]. The mechanism of lateral bone repositioning micro vascular regeneration is still unclear. It has been suggested that bone marrow is the source of micro vascular regeneration and other studies have suggested that periosteal retraction induced micro vascular regeneration. Antibiotic bone cement possesses good mechanical strength and barrier effect, releases antibiotics locally and is independent of blood flow conditions. Thus, antibiotic bone cement has been promoted for DF management, especially in trauma involving bone tissue. As one of the main manifestations of DF patients, the pain will increase the psychological burden and aggravate the condition of patients and the improvement of the patient condition can be reflected through pain assessment. Tibial nerve motor conduction velocity and common peroneal nerve sensory conduction velocity, as common lower limb function indicators, reflect the improvement of lower limb nerve conduction function in patients with DF[13]. Peak flow rate, blood flow and intravascular diameter are common hemodynamic indices that can indicate the improvement of dorsalis pedis artery hemodynamics and microcirculation in patients and wound area, transcutaneous partial pressure of oxygen and wound pH are common healing indices that reflect the improvement of ulcer wounds in patients[13]. To this end, the current study was undertaken to evaluate the clinical efficacy of antibiotic bone cement plus lateral bone repositioning for severe DF and its impact on wound healing rate.

Materials and Methods

General information:

Sixty patients with hemodialysis anemia admitted to the endocrinology department of our hospital from July 2020 to July 2021 were included and randomly assigned to receive antibiotic bone cement plus lateral bone repositioning (observation group) or Vacuum Sealing Drainage (VSD) (control group). Informed permission was obtained from the patients and informed consent was signed prior to enrollment in the study. The study protocol was approved by the hospital ethics committee and all processes complied with the Declaration of Helsinki ethical guidelines for clinical research as shown in Table 1.

Indices Observation (n=30) Control (n=30) p
Age (years, x̄±s) 64.5±5.66 63.3±5.97 0.08
Wagner classification, n (%)
3 3 (10) 7 (23)
4 24 (80) 21 (70) 0.19
5 3 (10) 2 (17)
Duration of foot ulcers/month, x̄±s 2.6±1.62 3.15±1.73 0.14
Side of ulcer, n (%)
Left 18 (60) 15 (50) 0.37
Right 12 (40) 15 (50)
Glycosylated hemoglobin (%, x̄±s) 10.34±1.62 10.56±1.71 0.26
Pain VAS score/point (x̄±s) 4.70±0.64 4.60±0.70 0.48
Toe skin temperature (°) 32.46±0.85 32.62±0.75 0.24

Table 1: Patient Characteristics

Inclusion and exclusion criteria:

Inclusion criteria: Patients with DF, lower extremity atherosclerosis-occlusive disease and thrombo-occlusive vacuities with chronic infection of the foot and ankle, which may include deep soft tissue infection of the foot and ankle, chronic osteomyelitis and septic arthritis, and other refractory infections; who received tibial lateral bone repositioning technique combined with antibiotic bone cement treatment and lower extremity vascular ultrasound or Computed Tomography (CT) angiography shows popliteal artery and proximal blood flow.

Exclusion criteria: With uncontrolled systemic infections; with underlying diseases that resulted in intolerance to surgery; with psychiatric disorders that prevented cooperation with treatment; with complete obstruction of the popliteal artery and above; with severe cardiac insufficiency; with severe renal insufficiency and, patients and family members did not accept the treatment plan.

Treatment methods:

The control group was treated with conventional ulcer wound debridement combined with VSD under nerve block anesthesia. After irrigation of the ulcer wound, the obvious necrotic tissues were removed by electric knife and the inter-ecological tissues were preserved as appropriate. After hemostasis, the DF wound was repeatedly irrigated with iodine peroxide solution and saline, and the VSD material (Shandong Weigao Group Co., Ltd.) was trimmed appropriately and completely covered the DF ulcer wound, followed by the connection of a negative pressure suction device, with the negative pressure ranging from -0.017 to -0.06 MPa in intermittent suction mode. The dressing was changed promptly in about 1 w depending on the oozing condition of the external trauma dressing. The growth of granulation at the base of the trauma was closely monitored. In the case of DF ulcers with localized granulomatous punctate bleeding and no obvious necrotic septic tissue, the VSD material was removed and the wound was cleaned and dressed. A free skin graft was used to restore the residual wound, or a conservative dressing change was used to promote the healing of the residual wound. The observation group received antibiotic bone cement plus lateral bone repositioning.

Thorough debridement: After anesthesia, the debridement method was selected according to the condition of the wound, necrotic and blackened tissues were removed, pus-soaked tendon tissues were excised, tissues without necrotic muscles or bleeding after scraping were preserved, tissues with osteomyelitis changes were cleared and the skin was preserved to the maximum extent possible. The second stage of debridement was indicated for late necrosis. The wound was repeatedly irrigated with hydrogen peroxide, dilute iodophor and saline several times during the trauma debridement.

Antibiotic bone cement to fill the trauma: Antibiotic bone cement was prepared according to the area of the trauma, with vancomycin to bone cement ratio of 1:20, using four 500 mg vancomycin to one 40 g packet of bone cement (PALACOS®, Heraeus Medical, China). The bone cement was sufficiently mixed into a drawn shape and then filled the trauma without leaving a dead cavity. A Kirschner needle was used to facilitate the injection of the bone cement. For wounds with more necrotic tissue and exudate, the bone cement was covered with VSD (Type III-PU, Shandong Weigao, China) for negative pressure drainage and the air pressure for negative pressure suction was 0.04-0.06 MPa. The cement was removed 4 w after trauma debridement bone cement filling and secretions were obtained every 3 d for review. Three consecutive bacterial cultures were performed and closure of the wound was conducted. In the event of continued bacterial growth from the discharge, second antibiotic bone cement filling was performed.

Installation of a tibial lateral bone repositioning scaffold: After successful anesthesia, the osteotomy range was designed about 1 cm below the tibial tuberosity (the traditional osteotomy zone is in the middle and lower third of the tibia). 2-3 mm external fixation pins were inserted into the repositioned bone block and the bone was osteotomies using an osteotomy mould. The holes were drilled with an electric drill (saline was used to cool the holes) and then the continuous bone between the holes was truncated with a thin bone cutter, with caution to protect the periosteum. The periosteal holes were repaired with sutures after drilling. Two to three 4 mm external fixation pins were inserted into the distal and proximal ends of the displaced bone block and the bone repositioning frame was installed and adjusted. The direction of bone repositioning was marked, followed by hemostasis of the incision by intra-incisional electrocoagulation and suturing of the incision after saline irrigation.

Postoperative precautions: Bone repositioning was performed 1 w after bone repositioning stenting by pulling the bone repositioning block outward 1 mm per day (bone repositioning turntable was turned 90° every 6 h and 360° every 24 h), back repositioning was usually performed after 2 w, back repositioning also lasted 2 w and a course of treatment was performed for 1 mo. Depending on the patient condition, the treatment was repeated for 2 to 3 sessions. Another debridement and bone cement filling were required for a long interval of disease. The external fixation stent was removed 1 mo after cessation of repositioning and the area around the fixation pins of the external fixation stent was disinfected and changed daily to prevent infection of the nail tract. The repositioning was discontinued immediately to prevent skin necrosis should the tension be too high. The repositioning was stopped in the event of severe infection and the external fixation could be removed.

Outcome measures:

Clinical evaluation indices: Clinical evaluation indices include limb preservation rate, postoperative ulcer healing, recurrence rate, mortality rate and the degree of resting pain of the affected limb after 1 h of rest in the flat position. Postoperative followup was performed to monitor the occurrence of complications.

Skin temperature, ankle-brachial index and sensory threshold of the affected limb: The wound healing was closely monitored postoperatively; before and after surgery, the patient’s skin temperature was monitored at 8:00 AM daily during the check-in and the selected site was the end of the lesser toe or the toe end of other toes, and the skin temperature of the affected limb was measured via a skin temperature gun and a sensory threshold detector was used to measure superficial sensation in the affected limb, with values >25 Volt indicating a high risk of DF ulcer, 16-25 Volt a moderate risk and <15 Volt a low risk.

Foot wound healing: The wound area before and after treatment, the transcutaneous partial pressure of oxygen in the skin at 3 cm around the wound and the pH of the wound were compared between the two groups of patients.

Dorsal pedis artery hemodynamics: The ultrasound detector was used to examine the arteries of both lower limbs of the patients before and after different treatments. The ultrasound probe was used on the patient's foot to measure the bilateral dorsalis pedis arteries and the indices included blood flow, peak flow velocity and intravascular diameter.

Lower limb function: The nerve conduction function of the affected limb before and after treatment was measured by Keypoint electromyography evoked potential instrument with the patient in the lying position, including the indices of sensory nerve conduction velocity and motor nerve conduction velocity.

Clinical efficacy: Markedly effective has clinical symptoms and signs completely disappeared or significantly reduced, and trauma healing exceeded 90 %; in effective case, clinical symptoms and signs significantly reduced, and trauma healing was 60 %-90 % and in ineffective, clinical symptoms and signs did not improve or even worsened, and trauma healing was less than 10 %.

Total efficiency=markedly effective+effective

Statistical analysis:

Statistical Package for the Social Sciences (SPSS) 23.0 was used for data analyses. The count data were expressed as n (%) and tested with the Chi-square (χ2) test. The measurement data were expressed as mean±Standard Deviation (SD); an independent sample t-test was used for intergroup comparisons and paired sample t-test was used for intragroup comparisons. A difference in statistical significance was indicated by p<0.05.

Results and Discussion

Patients in the observation group had significantly better perioperative indices vs. those in the control group (p<0.05) as shown in Table 2.

Indices Observation (n=30) Control (n=30) p
Length of hospitalization/month (x̄±s) 8.43±1.92 27.13±7.64 0.01
Postoperative ulcer healing rate, n (%) 10 (100) 2 (6.67) 0.01
Recurrence rate, n (%) 0 (0) 8 (26.67) 0.01
Amputation rate, n (%) 0 (0) 7 (23.33) 0.02
Mortality rate, n (%) 0 (0) 3 (10) 0.13

Table 2: Perioperative Indices (X±S)

Antibiotic bone cement plus lateral bone repositioning resulted in significantly higher skin temperature of the affected limb and lower anklebrachial indices and sensory threshold vs. VSD (p<0.05) as shown in Table 3.

Group Skin temperature of the affected limb (°) Ankle-brachial indices Sensory threshold (Volt)
Before treatment After treatment Before treatment After treatment Before treatment After treatment
Observation (n=30) 28.84±0.52 31.23±0.51 0.72±0.16 0.87±0.16 27.20±3.12 24.83±2.65
Control (n=30) 27.95±3.28 29.97±3.62 0.75±0.21 0.91±0.21 27.07±8.63 26.60±2.24
t 0.196 -16.479 0.198 -3.456 0.064 2.879
p 0.845 <0.001 0.843 <0.001 0.949 <0.001

Table 3: Skin Temperature Of The Affected Limb, Ankle-Brachial Indices And Sensory Threshold (X±S)

The differences in dorsalis pedis artery vascular internal diameter, blood flow and peak flow velocity between the two groups were not statistically significant before treatment (p>0.05). In both groups after treatment, the dorsalis pedis arteriosus internal diameter and blood flow increased, and the peak flow velocity decreased (p<0.05), with significantly greater results in the observation group, and a lower peak flow velocity was observed in the observation group than in the control group (p<0.05) as shown in fig. 1.

pharmaceutical-sciences-artery

Fig. 1: Dorsalis pedis artery hemodynamics Note: (Image): Experiment (Pre); (Image): Experiment (Post); (Image) Control (Pre) and (Image): Control (Post)

Before treatment, the difference in trauma area, transcutaneous partial pressure of oxygen and trauma pH between the two groups did not come up to the statistical standard (p>0.05). After treatment, the observation group showed a significantly smaller trauma area, a lower trauma pH and higher transcutaneous partial pressure of oxygen than the control group (p<0.05) as shown in Table 4.

Group n Trauma area (mm2) Transcutaneous partial pressure of oxygen (mmHg) Trauma pH
Before treatment After treatment Before treatment After treatment Before treatment After treatment
Observation 30 491.83±43.12 82.32±9.14 24.17±2.24 36.12±2.72 7.16±0.44 6.49±0.32
Control 30 492.39±42.47 197.46±26.18 23.96±2.13 28.43±2.84 7.14±0.46 6.65±0.34
χ2/ t 0.289 28.616 0.673 12.078 0.208 4.958
p 0.773 0.002 0.503 0.015 0.835 0.027

Table 4: Wound Healing (X±S)

There was no statistically significant difference in common peroneal nerve sensory conduction velocity and tibial nerve motor conduction velocity between the two groups of patients before treatment (p>0.05). Compared with before treatment, the sensory conduction velocity of the common peroneal nerve and the motor conduction velocity of the tibial nerve increased in both groups after treatment (p<0.05), with better outcomes in the observation group vs. the control group (p<0.05) as shown in fig. 2.

pharmaceutical-sciences-nerve

Fig. 2: Lower extremity nerve conduction function Note: (Image): Experiment (Pre); (Image): Experiment (Post); (Image) Control (Pre) and (Image): Control (Post)

Antibiotic bone cement plus lateral bone repositioning resulted in significantly higher treatment efficiency vs. VSD (p<0.05) as shown in Table 5.

Group n Markedly effective Effective Ineffective Cases with effective efficacy Total efficacy (%)
Observation 30 18 9 3 27 0.9
Control 30 12 7 11 19 0.6333

TABLE 5: Clinical Efficacy (X±S)

DF is a foot ulcer, infection and tissue destruction caused by neurological and vascular lesions in diabetic patients with high morbidity, mortality and amputation rates[14,15]. The prevalence of DF in diabetic patients is 12 % to 25 % and the international diabetes federation reports an estimated 9.1 to 26.1 million new DF cases each year. Patients with DF have a 2.5 fold increased risk of death compared to diabetic patients without foot trauma[16], and DF is poorly treated with a high risk of recurrence. It has been reported that the recurrence rate is 40 %, 60 % and 65 % within 1, 3 and 5 y, respectively. In addition, research has shown that the risk of amputation in diabetic patients is 10 to 30 times higher than in nondiabetic patients[17]. Hence, there exists an urgent need to explore more effective treatment methods for DF.

The results of the present study showed that antibiotic bone cement plus lateral bone repositioning resulted in significantly higher treatment efficiency and transcutaneous partial pressure of oxygen, smaller wound, and lower trauma pH vs. VSD, suggesting that antibiotic bone cement plus lateral bone repositioning contributes to potentiating the treatment efficacy and reducing the foot ulcer trauma, thereby facilitating rapid recovery. Patients given antibiotic bone cement plus lateral bone repositioning had larger vascular internal diameter and blood flow, and better sensory conduction velocity of the common peroneal nerve and the motor conduction velocity of the tibial nerve vs. those given VSD, indicating its vascular and neurological benefits. The reason may be that tibial lateral bone repositioning reduces damage to all surrounding tissues including the periosteum, bone tissue and surrounding soft tissues[18]. By laterally pulling the tibial bone fragment, a continuous, slow and steady pulling stress was given to the living tissue to stimulate the simultaneous regeneration of bones, muscles, blood vessels and nerves in the body. This technique effectively improves lower limb blood flow and neuropathy, promotes microcirculation regeneration in the affected limb, restores blood flow to the foot and ankle trauma and also activates the regenerative potential of traumatic soft tissues to improve the healing rate of infected wounds[19]. Antibiotic bone cement on the surface of DF ulcers can form an induced membrane, from which multiple cytokines, such as vascular endothelial growth factor, angiogenesis-related factors and Transforming Growth Factor beta (TGF-β), can be secreted to promote the repair and healing of ulcer wounds. In addition, the rich vascular network system formed around the ulcer by the induced membrane can play a great role in improving the blood supply to the DF wound, increasing the local resistance to infection and promoting the survival of the later implant or flap repair of the DF wound[20,21].

Chinese doctors were the first in the world to adopt tibial lateral bone repositioning for the treatment of DF ulcers and vacuities ulcers and achieved good results with a low recurrence rate. In this study, tibial lateral bone repositioning combined with antibiotic bone cement resulted in successful limb preservation and disease healing. However, this technique is still under development, progress and improvement, and there remain various issues to be addressed. The issues are mainly focused on the unclear mechanisms and principles of the technique, the unstable effect and the presence of serious complications such as flap necrosis, medically induced fractures and even death. Some elderly patients with DF were long-term bedridden after fracture and died during treatment with complications such as thrombosis and pulmonary infection[22]. The main technical mechanism of the procedure is the provision of a controlled and adjustable trauma stimulus. The body produces a repair response to trauma when it is exposed to trauma, and this trauma-repair response allows for the repair of trauma, mainly by cytokines at the molecular level, whose possible factors includes but is not limited to multiple inflammatory factors, growth factors, bone morphogenetic proteins and stem cell mobilization[23,24].

The advantages of antibiotic bone cement; antibiotic bone cement covered on the ulcer wound induces the formation of an induced membrane, which secretes a series of factors such as vascular endothelial growth factor, angiogenesis-related factor and TGF-β. These factors accelerate wound healing, and the induced membrane creates a rich vascular system that improves local blood supply, enhances anti-infection effects and promotes rapid wound healing[25]. Compared with intravenous or oral antibiotics, antibiotic bone cement releases a significantly higher concentration of antibiotics, longer duration of action, has more significant local bactericidal ability and prevents the development of drug-resistant bacteria, thereby creating a good antibacterial environment, contributing to the control of traumatic infections and reducing the adverse effects produced by prolonged systemic administration[26]. The antibiotic bone cement provides close apposition to the ulcerated wound, removes the ineffective cavity, enhances the antibiotic efficacy and creates a better environment for wound healing, with easy operation, short operation time and lower difficulty of second stage wound closure[27]. This study has the following limitations; the sample size of this study was small and only a single-center trial was conducted, which is subject to selective bias; it was not possible to evaluate the test results blindly during the study, which was subject to measurement bias and longterm efficacy evaluation was absent.

Antibiotic bone cement plus lateral bone repositioning enhances the treatment efficiency, boosts trauma healing and promotes postoperative functional recovery of patients. The research provides new solutions to improve efficiency and avoid complications. The theory of "trauma-repair and regeneration-reconstruction system" can well explain the surgical mechanism and the principle of action and put forward new ideas for the repair of trauma at the molecular level, such as inflammatory factors, regenerative factors, stem cell mobilization and information transfer. Regardless of the confirmation and falsification, there is a wide space and research prospect for further active exploration. It is expected that a large number of investigators and patients will cooperate to conduct clinical studies with larger samples in the future to provide more clinical evidence for the research and application of this method.

Author’s contributions:

Wei Shang and Peichao Liu designed the research study. Xinhua Cheng and Xiaotao Wang performed the research. Yonggui Yu conducted the experiments and analyzed the data. All authors contributed to editorial changes in the manuscript. All authors read and approved the final manuscript.

Acknowledgement:

Wei Shang and Peichao Liu have contributed equally to this work.

Ethics approval:

The protocol was approved by the ethics committee of Renmin Hospital, Hubei University of Medicine. Ethical No: 1591792.

Conflict of interests:

The authors declared no conflict of interests.

References