Modified Implant Fixation Technique Is an Alternative for Patients with an Anterior Cruciate Ligament Tear in Limited Resource Settings: A Comparison Functional Outcome Study with Polyether Ether Ketone and Bioabsorbable Screws.

Background: Anterior cruciate ligament (ACL) injury is one of the most prevalent factors contributing to knee instability worldwide. This study aimed to evaluate modified metal fixation techniques for ACL reconstruction compared to factory-made implants, such as polyether ether ketone (PEEK) screws, bioabsorbable screws, and modified metal implants. Methods: A retrospective cohort analysis was conducted to assess the functional outcomes of ACL using various fixation methods. Patients who underwent arthroscopic ACL reconstruction at several healthcare facilities were included in the study. The functional outcomes were evaluated using the Lysholm Knee Scoring Scale and the International Knee Documentation Committee (IKDC) score questionnaire at 6- and 12 months post-surgery. Statistical analyses, including the Shapiro-Wilk test and analysis of variance, were performed to compare outcomes among the fixation groups. Results: Thirty-three patients who underwent ACL reconstruction surgery with varying distributions across the three fixation groups (modified metal implants, PEEK screws, and bioabsorbable screws) were included in the study. As measured by the Lysholm and IKDC scores at 6- and 12 months post-surgery, the PEEK group demonstrated the highest average scores. Nevertheless, these functional outcomes were not significantly different between the groups (p = 0.140, 0.770, 0.150, and 0.200). These findings align with those of meta-analyses comparing different fixation methods for ACL reconstruction. Conclusions: While acknowledging the small sample size as a limitation, this study suggests that modified metal implants represent viable options for ACL reconstruction. The selection of fixation methods should consider patient characteristics and preferences, emphasizing biomechanical stability and long-term outcomes. Further research is needed to validate these findings and explore their biomechanical properties and cost-effectiveness.

Clinical outcomes and surgical strategy for spine tuberculosis: a systematic review and meta-analysis.

PURPOSE: Spinal tuberculosis (TB) is a slow-developing disease that often causes cord compression, spinal instability, and deformity. Surgery is generally required in cases of refractory disease, severe kyphosis, neurological deficits, or lack of improvement. However, there is a lack of comprehensive evidence in comparing the efficacy of various surgical approaches. The study aims to provide a clearer understanding of the relative effectiveness of the available surgical modalities in the management of spinal TB. METHODS: This review adhered to the PRISMA statement with searching conducted until 11th April 2023. Inclusion criteria included studies involving surgical procedures for spinal tuberculosis, with relevant clinical outcomes reported. Data extraction involved the collection of information on study and population characteristics, interventions used, relevant clinical outcomes, and reported complications. The risk of bias was evaluated using Cochrane's Risk of Bias in Non-randomized Studies tool. RESULTS: Searching resulted in 20 cohort studies that analyzed surgical methods for spinal tuberculosis. Eleven studies had low bias and nine studies had moderate bias. The anterior approach was associated with faster perioperative duration [- 2.02 (- 30.71, 26.67), p < 0.00001], less blood loss [- 4242 (- 176.02, 91.18), p < 0.00001], shorter hospitalization [- 0.19 (- 2.39, 2.01), p < 0.00001], better angle correction [1.01 (- 1.82, 3.85), p < 0.00001], and better correction rates [11.36 (- 7.32, 30.04), p < 0.00001] compared to the posterior approach. Regarding neurological function recovery, the anterior and posterior approaches were equally effective, while the posterior approach was associated with a higher incidence of complications. The review also reported on the complications associated with the surgical approaches, and 9 out of 20 studies reported complications. The anterior approach was found to have fewer complications overall. CONCLUSION: The anterior approach is thought to have fewer complications than both combined and posterior-only approaches, but the variability of the findings indicates that the decision-making process for selecting a surgical approach must consider individual patient and disease characteristics, as well as surgeon training.

Synergistic VSV Virotherapy and Carbon Nanotube Photothermal Therapy for Osteosarcoma in Murine Models.

BACKGROUND/AIM: Wide resection is usually performed for malignant bone and soft tissue tumors, but there is often functional impairment of the affected limb. In this study, we performed virotherapy with the vesicular stomatitis virus (VSV) and photothermal therapy using carbon nanotubes (CNTs) in combination for osteosarcoma, followed by marginal excision. The possibility of local treatment of the primary tumor was then assessed. MATERIALS AND METHODS: LM-8 cells (1×107) were subcutaneously implanted into 5-week-old mice to generate an in vivo osteosarcoma mouse model. Marginectomy was performed. Four groups with six mice each were created: VSV+SWCNTs group, VSV group, SWCNTs group, and an untreated group. Tumor margin resection was performed 2 weeks after tumor cell transplantation. The primary tumor volume, local recurrence, distant metastasis, and survival rate were evaluated. RESULTS: The combination of VSV virotherapy and CNTs photothermal therapy resulted in shrinkage of the primary tumor and reduced local recurrence after marginectomy. There was no significant difference in distant metastasis or survival rate for all groups. CONCLUSION: Combining virotherapy with VSV and CNTs photothermal therapy is useful for local treatment of osteosarcoma in murine models, possibly allowing for smaller tumor resection margins.

Randomized controlled trial of vitamin d supplementation on toll-like receptor-2 (tlr-2) and toll-like receptor-4 (tlr-4) in tuberculosis spondylitis patients.

BACKGROUND: Tuberculosis spondylitis accounts for approximately 50% of all cases of skeletal tuberculosis. Vitamin D plays a role in the immune system. Vitamin D helps in the activation of TLR-2 and TLR-4, which play a role in the process of tuberculosis infection. The objective of this study was to investigate the effect of oral supplementation with vitamin D on TLR-2 and TLR-4 levels in tuberculosis spondylitis patients. METHODS: The true Experiment Design Pretest-Posttest with Control Group (Pretest-Posttest with Control Group) was used for this research. TLR-2 and TLR-4 were measured by ELISA. Repeated ANOVA, ANOVA tests, and Kolmogorov-Smirnov normality tests on the SPSS program were used to statistically analyze the results. RESULT: In the dose groups of 10,000 IU and 5000 IU, significant increases in the levels of vitamin D, TLR-2, and TLR-4 were observed at weeks 4 and 8 (p < 0.05). In the control group, there was no significant increase. CONCLUSIONS: Vitamin D supplements can significantly increase TLR-2 and TLR-4 levels. Supplementation with vitamin D 10,000 IU/day for 8 weeks can increase vitamin D levels > 50 ng/dl to optimally act as an immunomodulator.

Diagnosis and surgical approach in treating glomus tumor distal phalanx left middle finger: A case report.

INTRODUCTION AND IMPORTANCE: Glomus tumors are rare mesenchymal neoplasms. These tumors originate from the glomus bodies and are commonly found in the fingertips, especially in the subungual location. The cause of this tumor is unknown. Clinically, the symptoms are non-specific and often not identified on physical examination and radiologically accompanied by rare cases, making it difficult to diagnose a glomus tumor. CASE PRESENTATION: Current report present a case of pain at the tip of the middle finger of the left hand in a woman for six years and worsening in the last two years. The patient has visited several doctors with analgesic therapy, but the complaints have not improved. A bluish nail was found on physical examination, and a clinical study with the Love's pin test and the Hildreth test had positive results. Radiographic examination showed destruction with cortical thinning of the medial aspect of the distal phalanx of the left middle finger, and MRI showed a lesion with an erosion of the distal middle finger. In this case, complete surgical excision and biopsy were performed using a transungual surgical approach. The sample was sent for microscopic examination, showing a glomus tumor. CLINICAL DISCUSSION: Cases with clinical symptoms of intense paroxysmal pain, exquisite point tenderness, and sensitivity to cold allow a clinical diagnosis in 90 % of cases. On clinical examinations such as Love's pin test, Hildreth's test, cold sensitivity test, and trans-illumination test with positive results and confirmed by MRI or ultrasound, the diagnosis of glomus tumor can be established. CONCLUSION: This case shows a glomus tumor in the distal phalanges of the middle finger of the left hand-diagnosis enforcement through detailed history taking and physical examination, confirmed by MRI and microscopic examination. Complete surgical excision is an effective treatment. In this case, using a transungual surgical approach based on preoperative MRI, the subungual lesion was found to provide the best exposure.

The level of ratio between matrix metalloproteinase-1 (MMP-1) and tissue inhibitor matrix metalloproteinase-1 (TIMP-1) after prolotherapy intervention and the functional outcome in patient with frozen shoulder: A randomized controlled trial.

OBJECTIVE: To determine the effect of prolotherapy on functional outcome changes, along with ratio of matrix metalloproteinase-1 (MMP-1)/tissue inhibitor matrix metalloproteinase-1 (TIMP-1) as an indicator of tissue repair in the glenohumeral joint in frozen shoulder patients. DESIGN: Single-blinded randomized controlled trial. SUBJECTS/PATIENTS: Participants with frozen shoulder. METHODS: The prolotherapy group is the study group, and the normal saline (NS) group is the control group. Each group was given injections at weeks 0, 2, 4, and 6. Level of biomarker levels was measured at week 6 and week 12 after there. Functional outcomes were measured at weeks 0, 6, and 12. RESULTS: A significant difference in week 6 and week 12 was demonstrated in the ratio of MMP-1/TIMP-1 level between the prolotherapy group and the normal saline group (P value = .002). Both groups performed well regarding the Numerical Rating Scale score and functional outcome. Compared to the normal saline group, prolotherapy changed the mean range of motion in flexion and internal rotation. CONCLUSION: Prolotherapy is considered to play a role in repairing cartilage based on biomarker assessment, particularly the ratio of MMP-1/TIMP-1-prolotherapy effectiveness in improving functional outcome and Numerical Rating Scale score.

Functional outcome of campanacci grade 3 giant cell tumours of distal radius after resection and reconstruction with ulnar translocation technique: a case series.

Reconstruction after en-bloc resection can be challenging in cases of Campanacci grade 3 giant cell tumour of the bone (GCTB) of the distal radius. Here, the authors examined the outcomes of patients with Campanacci grade 3 GCTBs of the distal radius who underwent wrist arthrodesis and reconstruction with ulnar translocation. Material and methods: This case series was a retrospective single-centre study. Clinical assessments regarding the functional status and complications were follow-up. The functional results were evaluated using the Musculoskeletal Tumor Society (MSTS) and Disability of Arm, Shoulder, and Hand (DASH) Score. Paired t-tests were used to compare the MSTS and DASH scores separately before and after the operation. Statistical differences were considered significant at P less than 0.05. Results: Seven patients were included in this study. The mean follow-up period was 14.43±8.08 months. The average length of tumour resection was 9.78±2.88 cm. The average range of motion of the involved forearm was 82.66° of supination and 81.54° of pronation. The average MSTS score was 11.71±2.21 before and 25.14±2.41 after the operation (P<0.05). The average DASH score on admission was 40.14±14.66, which decreased to 9.02±4.23 after the operation (P<0.05). Of the seven cases, one case had a recurrence, and one patient had radioulnar synostosis. Conclusion: Wrist arthrodesis combined with ulnar translocation can be considered a simple and effective reconstruction method with preservation of function after en-bloc resection of Campanacci grade 3 GCTB of the distal radius. It provides good functional outcomes with low complication rates.

A Case Series: Effect of Comorbidities on the Outcomes of Prolotherapy Injection for Frozen Shoulder Patients.

Frozen shoulder (FS) is a disease caused by an inflammatory condition that causes severe pain and decreased range of motion by loss of glenohumeral mobility. Frozen Shoulder restricts daily life's functional aspect, increasing morbidity. Hypertension and diabetes mellitus are risk factors that make an FS poor prognosis during treatment because of the diabetes glycation process and hypertension-enhanced vascularization. Prolotherapy injects an irritant solution into the tendon, joints, ligaments, and joint spaces to release growth factors and collagen deposition, reducing pain, restoring joint stability, and increasing the quality of life. We report 3 cases of patients with confirmed FS. Patient A with no comorbidity, patient B with diabetes mellitus, and patient C with hypertension, with all patient's chief complaints of shoulder pain and limited ROM, and symptoms affected the general quality of daily life. This patient was provided injection with Prolotherapy treatment combined with physical therapy intervention. Patient A had significantly improved ROM to maximum after 6 weeks with relieved pain and improved shoulder function. Patients B and C showed increased ROM, still tiny, decreased pain, and improved shoulder function. In conclusion, prolotherapy demonstrated a beneficial effect in a patient with FS with comorbidities, although not to the maximum extent in patients without comorbidity.

Oncolytic Effect of a Recombinant Vesicular Stomatitis Virus Encoding a Tumor-suppressor MicroRNA in an Osteosarcoma Mouse Model.

BACKGROUND/AIM: Attempts have been made to enhance treatment with vesicular stomatitis virus (VSV) for osteosarcoma. We have previously shown that VSV incorporated with miRNA143 enhanced the antitumor effect at some doses; however, the range of the doses was narrow. This has not been evaluated in vivo, and the synergistic effect of this antitumor effect in animals is unknown. The purpose of the study was to evaluate the oncolytic effect of VSV-miRNA on osteosarcoma cells in vivo. MATERIALS AND METHODS: A novel oncolytic VSV was developed by incorporating the tumor-suppressor microRNA143 (rVSV-miR143). In order to compare the antitumor effects of administration methods (intravenous and intratumoral administration) of rVSV-miR143 with those of VSV, a comparative analysis of primary tumor volume, metastatic lesions and survival rate was performed in mouse models of osteosarcoma. RESULTS: Following intratumoral injection, rVSV-miR143 showed a significant reduction in primary tumor volume, but no significant difference was observed in metastatic lesions and survival rate compared to VSV. Following intravenous injection, rVSV-miR143 revealed no significant difference in primary tumor volume, metastatic lesion and survival rate compared to VSV. CONCLUSION: VSV incorporating tumor-suppressor miRNA143 demonstrated a slightly synergistic antitumor effect on osteosarcoma in vivo.

Effectiveness of Prolotherapy Combined with Physical Therapy Versus Physical Therapy Only for Frozen Shoulder: A Case Report.

BACKGROUND Frozen shoulder (FS) is a common conditions that causes significant morbidity. It is characterized by restriction of both active and passive shoulder motion (ROM) of the glenohumeral joint. The etiology, pathology, and most efficacious treatments are unclear. The purpose of FS treatment is complete elimination of pain and recovery of shoulder joint function. Prolotherapy injects certain compounds into articular spaces, ligaments, and/or tendons to relieve pain and disability around joint spaces and to stimulate a proliferation cascade to enhance tissue repair and strength. This case report aims to describe functional outcome changes in 2 patients with FS, comparing prolotherapy combined with physical therapy vs physical therapy only. CASE REPORT We report the cases of 2 patients with confirmed FS. Patient A was 66-year-old man with chief concern of right shoulder pain and limited ROM in the past 3 months, which disrupted daily life, with a visual analog scale (VAS) of 6 out of 10. Patient B was 65-year-old man with chief concern of right shoulder pain and limited ROM in the past 2 months. The symptoms affected his general quality of life, with a VAS of 5 out of 10. Patient A underwent prolotherapy combined with physical therapy and had significantly improved ROM after 2 weeks, with relieved pain and improved shoulder function. Patient B underwent physical therapy only and showed similar ROM and no significant pain improvement. CONCLUSIONS Initial treatment with prolotherapy combined with physical therapy for patients with frozen shoulder achieved fast improvement of active and passive ROM, significantly decreased pain, and improved quality of life compared to physical therapy intervention only.

Tuberculosis of the knee masquerading as pigmented villonodular synovitis: Report of two cases.

INTRODUCTION AND IMPORTANCE: The manifestation of tuberculous mimicry is challenging to diagnose, especially in extrapulmonary Tuberculosis (TB). Pigmented villonodular synovitis (PVNS) may mimic tuberculous arthritis of the knee joint. In young, otherwise healthy-appearing individuals, tuberculous arthritis and PVNS in the knee joint could present as monoarticular involvement, with painful swelling of extended duration and limited movement. The core therapies for tuberculous arthritis and PVNS are different. CASE PRESENTATION: There are two patients. First, male 25 years old presented with a painful mass at the left knee of 3-years duration. The second patient was 14 years old boy who presented with a painful mass at his left knee for ten months before being admitted to the hospital. From the physical examination, plain x-ray, and MRI, both patients are highly suggestive of PVNS. However, the histopathology result and microbial culture showed a tuberculous-specific process. CLINICAL DISCUSSION: Because of its clinical manifestations, X-ray, and MRI features, patients were initially suspected of having the diffuse type of PVNS. An improper diagnosis may be due to atypical clinical presentation, wide use of antibiotics, the low specificity of diagnostic tools, and most of all, the clinician not prioritizing the possibility of tuberculous arthritis. Open biopsy and the result of the microbial culture establish the definitive diagnosis of knee tuberculosis. CONCLUSION: In conclusion, the clinical and radiologic findings in TB gonitis and PVNS are occasionally similar. Therefore TB gonitis should be highly suspicious, especially in endemic areas. Histopathology results and mycobacterial culture need to determine the diagnosis.

Distally based hemisoleus flap for soft tissue defect closure following chronic osteomyelitis of the distal tibia: A case report.

INTRODUCTION AND IMPORTANCE: Chronic osteomyelitis often needs extensive debridement that leaves a gap and needs soft tissue reconstruction procedure. The use of pedicled versus free flap to reconstruct soft tissue following surgical debridement has long been debated. Pedicle flap is more favored by many surgeons for the distal third tibia, mainly due to its lower failure rate. CASE PRESENTATION: We report a 33-year-old man with eight years of chronic osteomyelitis treated with surgical debridement at the distal third tibia, leaving a 5 cm × 6 cm soft tissue defect with exposed bone. Against the common preference, we performed a distally based hemisoleus flap (pedicled flap) covered with a split thickness skin graft. No signs of flap/graft rejection were observed during follow-up, and the patient was able to return to work four months following the surgery. No limitation in patient's daily activity upon two years follow up. CLINICAL DISCUSSION: Preservation of critical perforators is essential during the elevation of the flap. The knowledge and application of the vascularity and angiosome principles are crucial in designing this type of flap, as some anatomical variations do exist. Meticulous tissue handling is required to support the basic knowledge of the lower limb vascular system. CONCLUSION: Distally based hemisoleus flap is a reasonable option for soft tissue defect following chronic osteomyelitis of the distal tibia.

Changes in levels of cartilage oligomeric proteinase and urinary C-terminal telopeptide of type II collagen in subjects with knee osteoarthritis after dextrose prolotherapy: A randomized controlled trial.

OBJECTIVE: To assess the effects of dextrose prolotherapy in patients with knee osteoarthritis on the levels of serum cartilage oligomeric proteinase and urinary C-terminal telopeptide of type II collagen, and on the Western Ontario McMaster Universities Index and numerical rating scale score for pain. METHODS: A randomized controlled trial, in which participants were randomly allocated into 2 groups, receiving injections of either hyaluronic acid or dextrose prolotherapy. The hyaluronic acid group received 5 injections, 1 each on weeks 1, 2, 3, 4 and 5, and the dextrose prolotherapy group received 3 injections, 1 each on weeks 1, 5 and 9. Serum cartilage oligomeric proteinase, urinary C-terminal telopeptide of type II collagen, Western Ontario McMaster Universities Index score, and numerical rating scale score for pain were measured at baseline and 3 weeks after the last injection. Comparative analysis was conducted using Wilcoxon test within groups and analysis of covariance (ANCOVA) test between groups. RESULTS: A total of 47 participants (21 allocated to hyaluronic acid, 26 allocated to dextrose prolotherapy) completed the protocol. Both interventions resulted in significant improvements in numerical rating scale scores for pain, total Western Ontario McMaster Universities Index scores, and its subscales score. However, the dextrose prolotherapy outperformed hyaluronic acid in numerical rating scale score for pain and level of urinary C-terminal telopeptide of type II collagen, with score changes differences of 0.93 (p = 0.042) and 0.34 (p = 0.048), respectively. No significant changes in level of serum cartilage oligomeric proteinase were found in either group. CONCLUSION: Dextrose prolotherapy is an alternative injection therapy for knee osteoarthritis, which was found to be associated with a significant reduction in urinary C-terminal telopeptide of type II collagen compared with hyaluronic acid injection. Neither injection method resulted in reduced serum cartilage oligomeric proteinase.

Extraskeletal Ewing sarcoma attached to the ulnar nerve: A case report.

INTRODUCTION: Extraskeletal Ewing sarcoma (EES) of the extremity is uncommon, and only a small number of reported cases have been devoted to the upper-extremity. PRESENTATION OF CASE: A 65-year-old woman presented with a recurrent EES, a highly malignant tumor, involving the ulnar nerve at the right elbow region which was initially suspected as a benign soft tissue tumor, schwannoma, thus marginal excision had been performed. Due to its malignant behaviour, we treated the recurrent lesion with wide excision and reconstruction combined with chemotherapy. Histological evaluation revealed a monotonous small round cells appearance. DISCUSSION: EES of the extremity involving the ulnar nerve is fairly uncommon. The tumor was often smaller in the adult than in the child population which was consistent with the present case, thus may mimic a benign tumor. Because of the overlapping histopathological features of EES with other tumors, other investigations such as immunohistochemistry and cytogenetic studies must be performed to allow definitive diagnosis. The result of our study was negative for the EWSR1-FLI-1 and CIC-DUX4 fusion gene, however, other less frequent translocations could be found in this case which does not exclude the diagnosis of Ewing sarcoma family. CONCLUSION: Few cases of EES involving the ulnar nerve have been previously reported. The correct diagnosis of EES involving the ulnar nerve has become particularly important in order to enable the initiation of comprehensive management that have the potential to reduce disease progression and the avoidance of improper and potentially harmful surgical therapy.

Double central ray amputation of the third and fourth digits for recurrent giant cell tumors of the hand: A case report.

INTRODUCTION AND IMPORTANCE: Recurrent giant cell tumor of the bone (GCTB) of the hand is very rare to be encountered. Our aim is to alert the surgeons to such condition and double central ray amputation of the third and fourth digits could be an option which may reduce the chance of a re-recurrence and provide an acceptable functional outcome. CASE PRESENTATION: We presented a 25-year-old woman with a recurrent GCTB of the proximal phalanx of the middle finger of the right hand. Considering the recurrent case, a high suspicion of malignancy, and apparent soft tissue extension, the lesion was treated with double central ray amputation of the third and fourth digits through metacarpals. CLINICAL DISCUSSION: Extraosseous soft tissue invasion of recurrent GCTB of the hand had an important role in the treatment recommendation. A balance must be considered between the risk of re-recurrence and the impact of radical resection on function. Double central ray amputation surgery was performed in order to decrease the risk of additional recurrences. Acceptable functionality of the hand as she scored 26/30 (86 % rating) evaluated by Musculoskeletal Tumor Society (MSTS) Scoring System and no signs of local re-recurrence were found for 6 months follow up. CONCLUSION: Double central ray amputation of the third and fourth digits is a good option for management of recurrent GCTB of proximal phalanx of the third digits with gross soft tissue extension to adjacent fourth digits region.

Development of an Oncolytic Recombinant Vesicular Stomatitis Virus Encoding a Tumor-suppressor MicroRNA.

BACKGROUND: Attempts have been made to enhance systemic therapy for osteosarcoma. In our previous study, the systemic administration of a vesicular stomatitis virus (VSV) improved the survival rates of mice with osteosarcoma but did not improve the long-term survival of the animals. MATERIALS AND METHODS: In the present study, we developed a novel oncolytic VSV by incorporating tumor-suppressor microRNA143 (rVSV-miR143) to compare the antitumor effects of various doses (10×10-4, 5×10-4, and 1×10-4 multiplicity of infection) of rVSV-miR143 with those of VSV in vitro. RESULTS: The cytotoxicity and migration-inhibitory effects of rVSV-miR143 on the osteosarcoma cells were significantly higher than those of VSV alone at a dose of 5×10-4 multiplicity of infection, indicating that rVSV-miRNA143 enhances the antitumor effect at certain doses. CONCLUSION: VSV incorporating tumor-suppressor miRNA143 demonstrated a synergistic antitumor effect on osteosarcoma cells in vitro.

Novel Near-Infrared Fluorescence-Guided Surgery With Vesicular Stomatitis Virus for Complete Surgical Resection of Osteosarcomas in Mice.

Attempts have been made to visualize tumor cells intraoperatively with fluorescence guidance. However, the clear demarcation and complete tumor resection have always been a challenging task. To address this, we have developed a novel fluorescence bioimaging system with vesicular stomatitis virus (VSV) incorporating Katushka, near-infrared fluorescent protein. VSV is tumor-specific owing to the deficiency of antiviral interferon signaling pathways in tumor cells. We aimed to evaluate the tumor specificity of the recombinant VSV-Katushka (rVSV-K) in osteosarcoma cells and to assess the feasibility of complete tumor resection by the rVSV-K fluorescence guidance. In in vitro experiments, mouse and human osteosarcoma cell lines and normal human mesenchymal stem cells were infected with rVSV-K and observed by fluorescence microscopy. Near-infrared fluorescence was observed only in osteosarcoma cells, even at a low-concentration of virus infections. In in vivo experiments, mouse osteosarcoma (LM8) cells were transplanted subcutaneously into the back of immune-competent mice to produce an osteosarcoma, which was then injected with rVSV-K. The areas emitting fluorescence were resected using a bioimaging system. The distance between the surgical and tumor margins of the fluorescence-guided resection with rVSV-K group was significantly larger than that of the non-guided resection groups. The local recurrence rate was significantly lower in the fluorescence-guided resection with rVSV-K group than in the non-guided resection groups. The distant metastasis rate and average survival rate were not significantly different between all groups. These results suggest that the rVSV-K is specific to osteosarcoma cells and enables complete tumor resection of osteosarcomas in mice. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res.

Coexistence of giant cell tumor of tendon sheath and enchondroma in the middle phalanx of the little finger mimicking a malignant tumor: A case report.

Giant cell tumor of the tendon sheath is a type of slow-growing benign soft tissue tumor that typically arises from the synovium of the tendon sheath. Enchondroma is a benign bone tumor comprising of mature hyaline cartilage that centrally develops within the tubular bone. While giant cell tumor of the tendon sheath or enchondroma are common benign soft tissue and bone tumors, respectively the simultaneous occurrence of these tumors in the same region of the hand is exceedingly rare, and it can mimic a malignant tumor, thereby making the diagnosis more challenging. Herein, we report an unusual imaging presentation of the coexistence of these tumors in the middle phalanx of the little finger, which to the best of our knowledge has not been previously reported, and this initially present as a single intrinsic osseous lesion mimicking malignancy. The coexistence of these tumor types must be considered in the differential diagnosis of an intramedullary lytic lesion with a poor margin associated with a soft tissue mass of the fingers, and a meticulous preoperative magnetic resonance imaging investigation was required.