Digital Deformities Research Articles

Method for luminescent digital image correlation deformation measurement in non-illuminated environments

This study presents a luminescent digital image correlation (DIC) method that utilizes long afterglow materials to prepare speckle patterns, overcoming the limitations of classical DIC in achieving high-precision deformation measurements, such as the issues of specular reflections from specimens and insufficient contrast of speckle patterns. While fluorescent DIC has some advantages in overcoming these limitations, it relies on active ultraviolet light sources, making it challenging for luminescent measurements. Long afterglow materials, capable of maintaining brightness for extended periods, serve as a viable alternative. Through sphere reconstruction experiments, the accuracy of this method was validated, demonstrating a relative error of 0.04% under well-illuminated conditions and 0.025% under non-illuminated conditions. Finite element simulations and a comparison with DIC experimental results showcased excellent consistency, suggesting the potential for this method to further replace fluorescent DIC measurements. Furthermore, the study revealed that speckle patterns prepared using this approach ensure measurement validity in both well-illuminated and non-illuminated scenarios. This luminescent DIC method holds promising potential for broader applications in non-illuminated measurement environments.

The relationship between Foot Posture Index and plantar pressure in a community-dwelling adult population with Type 2 diabetes

AimsTo investigate the contribution of foot type to plantar pressures in a community-dwelling adult population with type 2 diabetes. MethodsFoot Posture Index-6 (FPI-6) as a measure of foot type, barefoot plantar pressure (peak pressures and pressure-time integrals), presence of forefoot deformities, peripheral neuropathy, ankle and first metatarsophalangeal joint (MTPJ) dorsiflexion range of motion (ROM), and demographic variables were measured. Standard multiple regression models were used to investigate the independent contribution of FPI-6 on plantar pressure variables at the hallux, forefoot, and rearfoot. Results122 adults (mean age 70.9 ± 9.3, n = 58 female) with type 2 diabetes were recruited. A lower (more supinated) FPI-6 significantly contributed to an increased forefoot pressure-time integral (β = −0.285, p = 0.04). FPI-6 was not a statistically significant independent predictor of peak pressure at the hallux, forefoot or rearfoot. ConclusionsWhen screening for at-risk sites of elevated plantar pressure in adults with type 2 diabetes, clinicians should consider performing the FPI-6 along with other clinical measures that have been shown to be associated with increased plantar pressures including first MTPJ dorsiflexion ROM, and presence of digital deformities. Evidence-based treatments to offload these areas should then be considered.

Differences and Similarities in the Feet of Metatarsalgia Patients with and without Rheumatoid Arthritis in Remission.

Objectives: Metatarsalgia continues to be a problem in patients with rheumatoid arthritis (RA) in remission (remRA), as well as in the non-rheumatic population, with a mechanical origin. Identify and compare clinical, morphological, disability, synovitis (ultrasound), and radiological osteoarticular damage characteristics in two groups of patients with lesser-ray metar-tarsalgia, with remRA, and without RA. Methods: Cross-sectional study with 84 patients with remRA (mRA) and 60 patients without RA (nmRA). The study evaluated five clinical variables (pain, Foot Function Index (FFI), joint mobility, digital deformities, and foot type), a radiological variable (osteoarticular damage), and an ultrasound variable (metatarsal synovitis). The data were analysed using descriptive and correlational techniques. Results: There were no significant differences in sex, age, body mass index (BMI), or degree of pain. Both groups showed a high prevalence of limited joint mobility for the ankle and first metatarsal phalanx (DF1st MTPJ) and digital deformities, with no statistically significant differences. Similarly, there were no differences in lesser-ray synovitis. On the other hand, there were differences in mRA with greater disability and activity limitation (FFI), LDD (lesser-ray digital deformities) stiffness, first-ray deformities, radiological damage, synovitis in 1st MTPJ, and positive Doppler (five patients). Conclusions: Metatarsalgia presents similarities in both populations. Biomechanical factors may influence the symptoms and presence of synovitis in patients with RA in remission. Other characteristics are more frequent in mRA, which could be related to the disease; thus, future research should include both biomechanical and ultrasound exploration of the foot in the valuation of patients in remission.

Congenital Single Digit Deformities: Series of Cases in Multiple Families in Remote Villages of Haryana

Abstract Background and Purpose: Congenital deformities occur due to abnormal development of limbs in the intrauterine life. The exact cause of this type of defect is not known but can be associated with environmental factors (drug history or exposure of chemical effluents from factory) or genetic predisposition. Cases involving the occurrence of single digits in all four limbs were witnessed, and the aim was to study and trace the cause of such deformities. Knowledge of thalidomide induced phocomelia which has already being published in the literature also contributed to our knowledge and understanding. Objectives: (1) Primary objective was to identify the causative agent or genetic factor for the occurrence of single digits in hands and feet in multiple families. (2) Secondary objective was to create awareness among patients and the general public as well as local government authorities regarding such families of “Divyang” patients. We present a case series of multiple families with complete absence of all fingers and toes except one across villages in Haryana. Materials and Methods: Clinical setting: (1) Study was based on a detailed questionnaire which was taken from multiple villagers (Tarawari Village, Nilokheri Village, etc.) and (2) phenotypic examination. Five affected patients from multiple families for 1 year were taken for study from March 2022 to March 2023. Their habitus, lifestyle, and environmental status were all studied and compared with other studies. Efforts were taken to study the license and toxic effluent treatment plan of a chemical factory present in the near vicinity. Results: A strong genetic association was suggested for the occurrence of single digits in the hands and feet of multiple patients across multiple villages close to a chemical factory. They have well adjusted with writing, eating, riding bikes, and four-wheelers with single fingers and toes. Conclusion: There is a need to establish genetic analysis so that the cause of such deformities could be known and prevented. There is also a need for general and government awareness toward pollutants released from chemical factories and their effects.

Mesoscale modeling of woven composite twisted structures combining digital element embedded model and affine transform

The mesoscale model with realistic yarn geometries could improve the accuracy of property prediction of woven composite structures. This paper aims to propose a novel mesoscale modeling method for the woven composite twisted structures. Firstly, the torsional deformation of the yarns in the unit cell model is simulated with high-fidelity using digital element fibers embedded into the matrix solid meshes. Then, the solid geometry model of the twisted composite structures is reconstructed from the digital element deformation model by combining the affine transforms. Finally, the elastic responses of the twisted composite structure under cantilever loading are predicted by assigning the element information of the established mesoscale model to the macroscale model. It is shown that the geometric morphology and predicted mechanical responses of the high-fidelity model are consistent with the experimental results. Furthermore, the effect of twist angles on the stiffness properties of the twisted composite structures is analyzed using the presented numerical method. The proposed digital modeling method could provide a guide for the early design of woven composite structures.

DEFORMATION INTERACTION OF STRONG EARTHQUAKES OF 2010–2016 IN THE ZONE OF INFLUENCE OF THE HIKURANGA SUPERPLUME (NEW ZEALAND) ACCORDING TO GPS OBSERVATIONS

Between 2010 and 2016, a series of 11 strong M>6 earthquakes occurred in New Zealand. In the area covering the epicentral zones of these seismic events, the spatiotemporal characteristics of movements and deformations of the Earth’s crust were obtained based on the processing of continuous satellite GPS observations at 64 points of the geodetic network. Using these data, we have studied the evolution of horizontal movements and deformations in order to reveal the possible relationship between the observed deformational and seismic processes. Analysis has been made on the total shear deformation, since the main tectonic structures of the region are faults with a shear mechanism of displacement of their sides. The presence of a giant mantle superplume in the area was the reason for the study of the behavior of horizontal dilatation deformation, and horizontal and vertical crustal motions. Based on the obtained digital deformation models, there were created kinematic visualizations, which are synoptic animations providing direct observations of the seismic deformation process and their heuristic analysis. The study revealed that a series of the strongest earthquakes may be interconnected by a long-term single deformation process, which is caused by the occurrence of an anomalous total shear deformation. The general maximum of shear deformation, dilatation deformation, and horizontal and vertical displacements are concentrated in the center of mantle superplume activity. Prior to strong seismic events, there occur zones of deficit (minimum) displacements of the Earth’s crust in the area of future epicenters, which is of research interest in terms of predicting their locations.

Upper limb ischemia at birth

The aim of this case report: is to present and discuss the clinical features, diagnostic challenges, management strategies, and outcomes of two cases involving upper limb ischemia in neonates. By examining these cases, we aim to contribute to the understanding of the underlying causes, diagnostic pathways, and potential interventions for neonates presenting with upper limb ischemia, emphasizing the importance of early diagnosis and appropriate management to minimize complications and enhance patient outcomes. Discussion Summary: ABS presents a range of fetal abnormalities caused by fibrous bands in the womb, leading to deformities and developmental interruptions. Limb constriction rings are common, potentially resulting in limb loss or digit deformities. Neonatal limb ischemia, particularly acute limb ischemia, is rare but associated with catheterization. In utero compression ischemia, often affecting the brachial artery, can lead to limb ischemia. Risk factors include maternal conditions like diabetes, dehydration, and more. Proper delivery planning is crucial for macrosomic infants. Diagnosis and management of neonatal limb ischemia are challenging. Doppler ultrasound is the primary diagnostic tool, with fetal CT enhancing prenatal assessment. Thrombolytic therapy, including alteplase and heparin, is a common treatment.

LU TAN-1 SAR SATELLITE CHARACTERISTICS AND PRODUCTIONS IN THE PHASE OF IN-ORBIT TEST

Abstract. Lu Tan-1 (LT-1) has finished the in-orbit test and will be delivered to the users in 2023. In this paper, we discussed the satellite characteristics including the satellite mission, the platform as well as the payload. The satellite constellation was designed following two main demands, i.e., digital elevation model (DEM) generation and deformation monitoring. Thus, we provided two kinds of productions. First was the DEM created using the images provided by helix bistatic formation. Second was the deformation products created using that of pursuit monostatic formation. The deformation products were finally classified into three different types given the processing technologies. They were deformation field provided by differential interferometric SAR (InSAR, DInSAR), deformation velocity field provided by stacking, and deformation time series provided by multi-temporal InSAR. DEM data were validated to be better than 5 m compared to ICESat. Deformation field, deformation velocity field, as well as deformation time series were validated to be better than 2.7 mm, 8.6 mm/yr and 3.7 mm, respectively.

Structural response of steel sandwich panels with PUR foam core subjected to edgewise compression: Experimental, numerical, and analytical considerations

With the objective of leading to innovative lightweight structural components in the construction sector using sandwich panels with polyurethane foam and steel face sheets, different studies were conducted on such structures, including experimental, numerical, and analytical campaigns. The experimental campaign includes the mechanical characterisation of the constituent materials and the edgewise compressive test of small-scale sandwich panels. The test protocols are detailed, and their influence on the results is assessed. Through the use of digital image correlation recordings, deformation patterns and failure mechanisms in the constituent materials and the composite structure are identified. Material constitutive models are calibrated based on the experimentally obtained results. The accuracy of such models is first evaluated against the stress–strain curves recorded during the experiments. In the second stage, the response of the sandwich panels subjected to edgewise compressive loading is simulated. A parametric analysis on the sensitivity of the numerical models to the initial geometrical imperfections is shown to be fundamental to capturing the behaviour of the sandwich panels. Furthermore, the experimental and numerical results are compared to analytical solutions of the problem of the edgewise compression of sandwich panels. Finally, a thorough discussion of the obtained experimental, numerical and analytical results is presented, along with comparisons to results available in the literature.

Comparative Radiographic Analysis of the Width of the Lesser Digit Proximal Phalangeal Heads.

Digital deformities represent a common presenting abnormality and target for surgical intervention in podiatric medicine and surgery. The objective of this investigation was to compare the radiographic width of the heads of the lesser digit proximal phalanges. One hundred fifty consecutive feet with a diagnosis of digital deformity and performance of weightbearing radiographs were analyzed. The maximum width of the heads of the lesser digit proximal phalanges were recorded from the radiographs using computerized digital software. The mean ± standard deviation of the head of the second digit proximal phalanx was 9.74 ± 0.87 mm (range, 7.94-11.78 mm); the head of the third digit proximal phalanx, 9.00 ± 0.91 mm (range,7.27-10.94 mm); the head of the fourth digit proximal phalanx, 8.49 ± 1.01 mm (range, 5.57-10.73 mm); and the head of the fifth digit proximal phalanx, 8.67 ± 0.89 mm (range, 6.50-11.75 mm). The width of the head of the proximal phalanx decreased from the second digit to the third digit (P < .001), decreased from the third digit to the fourth digit (P < .001), and then increased from the fourth digit to the fifth digit (P = .032). The results of this investigation provide evidence in support of an anatomical and structural contribution to digital deformities. The width of the heads of the lesser digit proximal phalanges decreased from the second to the third to the fourth toes, and then subsequently increased with the fifth proximal phalangeal head.

Convolutional and fourier neural networks for speckle denoising of wrapped phase in digital holographic interferometry

Owing to the unique non-Gaussian statistics and non-stationary properties, speckle denoising in digital holographic interferometry measurements is essential and challenging. Traditional Fourier-based frequency-domain filtering and deep-learning-based (DL-based) spatial-domain speckle denoising methods have realised significant achievements. However, these methods use different mechanisms and are applied separately. A deep learning-based algorithm combining the aforementioned methods is proposed, which simultaneously extracts features in the spatial and frequency domains via convolutional and Fourier neural networks (CFNN) for enhanced speckle denoising and minimising the phase unwrapping process error. Compared with the convolutional neural network (CNN), which provides spatial-domain features for the framework architecture to layer extraction operation, the Fourier neural operator (FNO) developed from traditional Fourier filtering provides the frequency-domain features. The differential gradient map of denoised wrapping is used as a loss function, further improving the smoothness of the denoised wrapped images and the subsequent phase-unwrapping performance. Compared to other algorithms, the proposed method achieves a relative improvement of 7.1% on the testing dataset and 5.0% on digital holographic deformation field experimental data. It can be extended to more fields of optical information processing, since it unifies the feature extraction and reconstruction in the spatial-domain and the frequency-domain in the same deep learning model.

Digital visualization of time-varying local bearing contact recognition for non-orthogonal aviation spiral bevel gears

Focusing on the time-varying meshing performance assessment and recognition, a new computer aided design/ computer aided manufacturing/ computer aided engineering (CAD/CAM/CAE) integration-based digital visualization of local bearing contact recognition is developed for non-orthogonal aviation spiral bevel gears. At first, universal tooth flank modeling and its CAD/CAM software development are developed to get a closed-form solution to the whole tooth flank points. Then, with applications of an improved digital kinematics arrangements, digital virtual assembly in CAD software is proposed for time-varying meshing simulation. To distinguish with the conventional loaded tooth contact analysis (LTCA), a digital deformation layering method is developed to show local bearing contact at each time-varying deformation layer. Where, accurate search for the loaded meshing points is developed by using the improved dichotomy iteration method. Moreover, instantaneous contact ellipse in software development is determined by chord intercept method. CAD/CAM/CAE integration-based digital visualization is performed by correlating with sensitive assembly error driven virtual simulation. Finally, the given numerical instance can verify the proposed method.

Forecasting landslides using community detection on geophysical satellite data.

As a result of extreme weather conditions, such as heavy precipitation, natural hillslopes can fail dramatically; these slope failures can occur on a dry day, due to time lags between rainfall and pore-water pressure change at depth, or even after days to years of slow motion. While the prefailure deformation is sometimes apparent in retrospect, it remains challenging to predict the sudden transition from gradual deformation (creep) to runaway failure. We use a network science method-multilayer modularity optimization-to investigate the spatiotemporal patterns of deformation in a region near the 2017 Mud Creek, California landslide. We transform satellite radar data from the study site into a spatially embedded network in which the nodes are patches of ground and the edges connect the nearest neighbors, with a series of layers representing consecutive transits of the satellite. Each edge is weighted by the product of the local slope (susceptibility to failure) measured from a digital elevation model and ground surface deformation (current rheological state) from interferometric synthetic aperture radar (InSAR). We use multilayer modularity optimization to identify strongly connected clusters of nodes (communities) and are able to identify both the location of Mud Creek and nearby creeping landslides which have not yet failed. We develop a metric, i.e., community persistence, to quantify patterns of ground deformation leading up to failure, and find that this metric increased from a baseline value in the weeks leading up to Mud Creek's failure. These methods hold promise as a technique for highlighting regions at risk of catastrophic failure.

Unilateral Partial Aphalangia and Hemimelia in an Adult Dog and Cat: Clinical Presentation and Radiography Findings

Congenital digital deformities are uncommon anomalies in dogs and cats and many of them are still not recorded in veterinary literature. This report describes the clinical presentation and radiological findings in a 3-year-old male German shepherd dog with a right pelvic limb partial aphalangia and an 11-year-old female Persian cat with a left thoracic limb partial hemimelia. The dog showed an absence of the fourth digit of right pes with abnormal footpads and a wide interdigital space between the third and fifth digits. Radiography revealed presence of all metatarsals, absence of the middle and distal phalanges of the fourth digit, under development of the proximal phalanx and foot pad of the fourth digit as well as fusion between the foot pads of fourth and fifth digits. The cat had only one digit, two nails and one rudimentary foot pad in the left thoracic limb. The left thoracic limb was shorter than the contralateral limb. Radiography revealed short ulna, presence of three carpal bones, absence of all metacarpals and presence of one digit with three phalanges. No other congenital disorders were noted in both animals. No treatment was offered because the dog and cat were coping well with their defects. In conclusion, dogs and cats with unilateral partial aphalangia and hemimelia can survive into adulthood with a reasonable quality of life, particularly indoor animals. Radiography plays a crucial role in complete description, classification and definite diagnosis of these defects in companion animals.

Effectiveness of Percutaneous Flexor Tenotomies for the Prevention and Management of Toe-Related Diabetic Foot Ulcers: A Systematic Review.

There is a high prevalence of digital deformities in diabetic patients, particularly claw toe, which can result in ulceration, often located at the tip of the toe. These lesions are challenging to off-load with conventional devices and frequently lead to infection and high amputation rates. Recent guidelines recommend considering flexor tenotomies to manage these ulcerations and prevent complications. This review, which analyzed 11 studies, aimed to assess the effect of flexor tenotomies on the healing and prevention of diabetic foot ulcers (DFUs) at the toe tip. Satisfactory results were found, with a healing rate of 92% to 100% and a mean healing time of 2-4 weeks. Few mild complications were observed, and the recurrence rate was very low. Transfer lesions were the most prevalent, but simultaneous tenotomy of all toes can eliminate this risk. Flexor tenotomies are a simple, effective, and safe procedure for the treatment and management of DFUs located at the apex of the toes and should be considered part of the standard of care for diabetic feet.

In-Situ X-ray Diffraction Analysis of Metastable Austenite Containing Steels Under Mechanical Loading at a Wide Strain Rate Range

This paper presents and discusses the methodology and technical aspects of mechanical tests carried out at a wide strain rate range with simultaneous synchrotron X-ray diffraction measurements. The motivation for the study was to develop capabilities for in-situ characterization of the loading rate dependency of mechanically induced phase transformations in steels containing metastable austenite. The experiments were carried out at the DanMAX beamline of the MAX IV Laboratory, into which a custom-made tensile loading device was incorporated. The test setup was supplemented with in-situ optical imaging of the specimen, which allowed digital image correlation-based deformation analysis. All the measurement channels were synchronized to a common time basis with trigger signals between the devices as well as post-test fine tuning based on diffraction ring shape analysis. This facilitated precise correlation between the mechanical and diffraction data at strain rates up to 1 s−1 corresponding to test duration of less than one second. Diffraction data were collected at an acquisition rate of 250 Hz, which provided excellent temporal resolution. The feasibility of the methodology is demonstrated by providing novel data on the kinetics of the martensitic phase transformation in EN 1.4318-alloy following a rapid increase in strain rate (a so-called jump test).

OUTPATIENT PERCUTANEOUS ULTRASOUND-GUIDED FLEXOR TENOTOMY FOR NEUROPATHIC APICAL TOE ULCERS

Percutaneous flexor tenotomy involves cutting the flexor digitorum tendons to correct claw toe deformity to treat apical pressure areas and prevent subsequent infection in patients with peripheral neuropathy. Performing this under ultrasound guidance provides reassurance of complete release of the tendon and increases procedural safety.This study is a retrospective case series evaluating the effectiveness, safety, and patient satisfaction of performing percutaneous ultrasound-guided flexor tenotomy in an outpatient setting. People with loss of protective sensation, a digital flexion deformity, and an apical toe ulcer or pre-ulcerative lesion who presented to our institution between December 2019 and June 2022 were included in this study. Participants were followed-up at a minimum of 3 months. Time to ulcer healing, re-ulceration rate, patient satisfaction, and complications were recorded. An Australian cost analysis was performed comparing this procedure performed in rooms versus theatres.There were 28 ulcers and 41 pre-ulcerative lesions. A total of 69 tenotomy procedures were performed on 38 patients across 52 episodes of care. The mean time to ulcer healing was 22.5 +/- 6.4 days. There were 2 cases of re-ulceration. 1 patient sustained a transfer lesion. There were four toes that went onto require amputation, all in the setting of pre-existing osteomyelitis. 94% of patients strongly agreed that they were satisfied with the outcome of the procedure. Costs saved were estimated to be $1426.Flexor tenotomy is a minimally invasive procedure that can be performed in the outpatient setting, and therefore without delay to treatment, reducing risk of ulcer progression and need for subsequent amputation. This is the first study to report on flexor tenotomy under ultrasound-guidance.Ultrasound-guided percutaneous flexor tenotomy is safe and effective, with high patient satisfaction and low recurrence rates. This performance in the outpatient setting ensures significant time and cost savings for both the practitioner and patient.

Congenital digital flexural deformity (knuckling): Epidemiology, the association of trace elements and surgical treatment in neonatal bovine calves.

This study aimed to investigate the prevalence and pattern of congenital flexural deformity (knuckling), to identify the association between trace elements and vitamins with the deformity, and to apply different surgical techniques for correcting this congenital malformation in newborn bovine calves. The study was implemented on 17 newborn calves with carpal (knee) and fetlock (foot) knuckling presented to the Veterinary Teaching Hospital of Bangladesh Agricultural University, Mymensingh, from January to December 2020. The serum biochemical alterations and clinical outcomes were assessed on days 0 and 21 following surgery. Two surgical methods: tendon transection and tendon elongation by Z-tenotomy, were performed for surgical restoration. We found that knuckling comprised 12% of the total congenitally malformed calves. The male calves had a higher prevalence (52%, n = 9) and the same in the winter season (65%, n = 11). The majority of the knuckling was bilateral types (88%, n = 15), involving the carpal joint (82%, n = 14) and moderately angulated (59%, n = 10). The serum level of magnesium, iron, vitamin D, and zinc were significantly (p < 0.05) changed from the pre-surgical stage to the stage of non-lameness after surgery. The disorder was surgically treated by tendon transection or tendon elongation procedure and had a good prognosis. The current study concluded that the development of knuckling in calves might be related to a deficiency/excess of specific minerals and vitamins and that it can be effectively corrected by surgical intervention; however, early diagnosis and the use of proper surgical techniques are crucial for improving the prognosis.

Minimally invasive surgery for pedal digital deformity: a systematic review

Objective: The interest and application of minimally invasive surgery (MIS) in treating lesser toe deformities have increased worldwide. The symptoms are often attributed to callosities and localized pressure. Conservative treatment may improve comfort, but its success largely depends on the level of deformity. When conservative treatment fails, surgery may be indicated. This study explores the available evidence and reviews in the literature seeking to examine the efficacy of MIS in lesser toe pathology. Methods: A systematic review was performed, and the search included the following databases: Cochrane Library, CINAHL, MEDLINE®, PUBMED, Science Direct, and other relevant peer-reviewed sources between September 2019 and June 2022. In addition, a manual search was conducted in Australian, American, British, and European orthopedic and podiatric scientific data for relevant studies. Results: The search for potentially eligible information for this systematic review yielded 92 unique studies. All studies identified were obtained and reviewed. An updated search was performed in July 2022, resulting in no additional studies that satisfied the inclusion criteria. After considering all potentially eligible studies, five (5.4%) met the inclusion criteria. One thousand one hundred eighty-six lesser toe procedures (500 patients) were included. The overwhelming majority of patients were female (80.5%). The patient’s mean age was 56.9 (range 18-91) years, and the mean follow-up was 19.6 (range 6-33) months. All of the studies included early mobilization in the postoperative protocol. Conclusion: There is a need for more research using a combination of validated patient-reported outcomes to evaluate the effectiveness of MIS procedures in treating lesser toe deformities alongside the development of validated and tested treatment algorithms to guide surgical decision-making. Level of Evidence III; Therapeutic Studies; Systematic Review.

Deformation and Failure Characteristics of Bimaterial Samples Consisting of Sandstone and Cemented Coal Gangue–Fly Ash Backfill under Uniaxial Loading

Based on the acoustic emission (AE) system and the digital scattered-spot deformation monitoring system, uniaxial compression tests were conducted on composite samples consisting of sandstone and cemented coal gangue–fly ash backfill (CGFB) to investigate their deformation and failure characteristics. The results showed that the average uniaxial compressive strength of the composite samples was 83.09% higher than that of the pure CGFB samples and 92.28% lower than that of the pure sandstone samples. In the composite samples, damage occurred in the CGFB part, and they showed obvious plastic damage characteristics. On both sides of the intersection, the sandstone and the CGFB deformed synergistically in the absence of a macroscopic failure. After a macroscopic failure, the interface effect promoted sandstone deformation and restrained CGFB deformation, transforming the sandstone and the CGFB on both sides of the intersection into a nonsynergistically deformed state. The interface effect had the most obvious influence on the horizontal deformation of the sandstone and CGFB monitoring points near the intersection. The failure of the CGFB samples induced sandstone springback deformation with a springback capacity of 0.0089 mm in the vertical direction and 0.0055 mm in the horizontal direction, which led to the further rupture and failure of the CGFB.