Spiral Groove Research Articles

Numerical and experimental investigation on the performances of a liquid metal bearing with spiral groove structures

Liquid metal is a perfect lubricant due to its low melting point, good fluidity at room temperature, higher thermal conductivity and high temperature stability. In this work, the novel hydrodynamic liquid metal bearing with spiral grooves is studied. Influences of the eccentricity, the bearing radius clearance, and the groove structural parameters on the pressure distributions and the load carrying capacity of journal liquid metal bearing are deeply numerically investigated. Meanwhile, the bearing clearance and the structure parameter of herringbone grooves on pressure distribution and load carrying capacity of thrust liquid metal bearing are also numerically conducted and experimentally validated. Numerical studies are conducted based on the finite element method. Results show that the pressure distribution and the load carrying capacity of journal liquid metal bearing are significantly affected by the eccentricity, the bearing clearance and the groove structural parameters. Specifically, for journal bearing, the load carrying capacity increases with the growth of the eccentricity and the groove spacing, while it decreases with the increase of radius clearance, the groove depth and the groove ridge ratio. Besides, it turns out that when the spiral angle is larger than 37.5 degree, the increase of the groove spiral angle results in a decrease of the load carrying capacity, while when the spiral angle is lower than 37.5 degree, the value of load carrying capacities at different spiral angle depends on the specific value of eccentricity. As for thrust bearing, the load carrying capacity increases with the decrease of bearing clearance, and the increase of groove depth. Besides, the groove numbers of 13 and the angle between two vertices of herringbone groove of 13 degree are beneficial for improving the load carrying capacity of thrust liquid metal bearings. Based on the above observations, optimal design parameter sets are selected to obtain much higher load carrying capacities up to four times for both journal and thrust bearings compared with the bearings with original parameters.

Analysis on the dynamic characteristics of spiral groove dry gas seal based on the gas film adaptive adjustment model

PurposeThis study aims to acquire the influence mechanism of gas film adaptive adjustment (GFAA) acted on the dynamic characteristics of spiral groove dry gas seal (S-DGS) and then propose a sealing stability enhancement measure.Design/methodology/approachThe gas film dynamic stiffness and damping of S-DGS are obtained by numerically solving the transient Reynolds equation based on perturbation method and finite difference method. The dynamic coefficients in GFAA model and constant gas film thickness (CGFT) model are compared and analyzed.FindingsThere is the risk to misestimate the instability of DGS with rotational speed or medium pressure grows under the condition of CGFT assumption. Based on GFAA model, increasing balance ratio B properly is an effective measure to improve the stability of DGS. The balance ratio can stimulate the sensitivity of gas film dynamic coefficients to the variation of rotational speed. Increasing medium pressure in small balance ratio range will be conducive to reducing the risk of angular instability.Originality/valueThe influence mechanism of GFAA on S-DGS dynamic characteristics is analyzed. The interactions between rotational speed and balance ratio, medium pressure and balance ratio acted on gas film dynamic characteristics are explored based on the GFAA model.

MARTIN LISTER’S 1678 <em>AMMONIS CORNU</em> AND THE MISREADING OF <em>HILDOCERAS BIFRONS</em> (BRUGUIÈRE, 1789). AN HISTORICAL INSIGHT ON THE RELEVANCE OF ARTWORK AND DETAILS IN TAXONOMY

Hildoceras bifrons (Bruguière, 1789) is a cosmopolite ammonite species from the Lower Jurassic of the Boreal and Mediterranean (Tethys) palaeogeographical provinces. Inter-demic and phylogenetic variability are noticeable, also affecting the most distinctive morphological trait: the spiral groove along the whorl flank. Since the XIX century, however, a number of morphotypes assigned to Hildoceras bifrons (many of which from the Apennines and other Italian localities) lacked a neat spiral groove, replaced by a shallow, variably evident and discontinuous inflection. Buckman (1918) provided a photographic illustration of a specimen he interpreted as corresponding to the holotype, until then represented by a drawing described by Lister (1678) as Ammonis cornu. Buckman’s illustration assessed the well-carved spiral groove as a distinctive feature of the holotype and a trademark of the species. Nevertheless, several authors insisted on referring faintly grooved specimens to Hildoceras bifrons, an attitude thus envisaged as due to their negligence or inaccuracy. In contrast with this view, it is herein argued that, on one hand, the specimen illustrated by Buckman, in quality of holotype or neotype, differs from Lister’s drawing to a point that it may not be the same specimen; on the other hand, Lister’s drawing (never formally invalidated as holotype) could have been legitimately considered representative also of those faintly grooved Hildoceras now assigned to Hildoceras lusitanicum Meister, 1913. This alternative view clarifies the taxonomic approach held by many authors, proving the coherency of their taxonomic work rather than their attitude at a superficial evaluation of diagnostic traits.

Study on flexural behavior of concrete beams reinforced with hybrid high-strength and high-toughness (HSHT) and ordinary steel bars

To study the flexural behavior of high-strength and high-toughness (HSHT) reinforced concrete beams with negative Poisson’s ratio and special spiral grooves on the surface, fifteen beams of 250 mm × 450 mm × 3200 mm were designed and manufactured to conduct bending tests. The effects of different parameters, including the reinforcement ratio, compressive strength of concrete, loading mode, the number of HSHT steel bars in hybrid reinforcement, and longitudinal steel bars type, were studied on failure modes, crack patterns, flexural stiffness, flexural strength, ductility, and energy absorption capacity. The load versus mid-span deflection curves for concrete beams reinforced with HSHT steel bars can be divided into five stages. The concrete beams reinforced with HSHT steel bars can also bear higher residual strength (approximately 0.9 Fp) and exhibit superior crack width control ability. The peak load increases by a maximum of 22.9 % with the reinforcement ratio of HSHT steel bars increasing from 0.86 % to 1.08 %. Hybrid reinforcement can improve the service performance of concrete beams, take full advantage of HSHT steel bars, and increase the energy absorption capacity of beams. Based on strain analysis of cross-section, the flexural strength model of concrete beams reinforced with hybrid reinforcement was proposed by considering the ultimate compression strain. The calculation results show that the proposed model can accurately calculate the flexural strength of concrete beams reinforced with HSHT steel bars.

Study on the hydrodynamic performance of two typical groove liquid film seals considering cavitation

PurposeThe purpose of this paper is to investigate the hydrodynamic performance of liquid film seals with oblique grooves (OGs) and spiral grooves (SGs), considering cavitation, compare and analyze the differences between them.Design/methodology/approachConsidering cavitation effect, the incompressible steady-state Reynolds equation was solved to obtain the sealing performance parameters of the liquid film seal with oblique groove and spiral groove.FindingsThe hydrodynamic performance of oblique groove seal (OGS) and spiral groove seal (SGS) shows a similar trend with the change of operating parameters. When the groove angle is less than 20°, the load-carrying capacity of SGS is better than that of OGS, while when the groove angle continues to increase, the hydrodynamic performance of OGS is slightly better than that of SGS, and more suitable for use under small differential pressure and high speed.Originality/valueThe hydrodynamic characteristics of liquid film seals with oblique grooves and spiral grooves considering cavitation effect were studied, which provides a theoretical reference for the application of oblique groove seal.

Hydrogen gas sensor based on seven-core fiber interference and Pt-WO3 film

Tungsten oxide (WO3) typically owns the characteristics of electrochemical, photo-chromic, and gas-chromic. The seven-core fiber (SCF) generates a strong interference signal that comprises super-modes. The thermo-optic and thermo-expansion characteristics of SCF were utilized with an aid of Pt-WO3 film that makes the sensor highly sensitive to the H2 gas environment. The sensor with spiral micro grooves by femtosecond-laser ablation considerably enhanced the H2 sensitivity from 3.28 nm/% to 4.0 nm/%, and obtained a response and recovery time < 90 s.

“Saturday Night Palsy”: Lessons from a Patient

“Saturday night palsy”, also known as “lovers’ paralysis”, is a neuropathy of the radial nerve, caused by extrinsic compression at a certain point in its path along the humerus, usually at the level of the spiral groove. This designation is based on the fact that this compression occurs, frequently, after excessive alcohol intake, thus resulting in an incorrect position of the arm during sleep. This is the fourth most common mononeuropathy worldwide, affecting about 2.97 per 100 000 men and 1.42 per 100 000 women. Paralysis of the radial nerve causes loss of sensory and/or motor functions, depending on where the nerve was injured. The following case refers to a patient observed in an acute consult in a Primary Care Unit, after waking up with his right-hand hanging. In this report, the deficit shown by the patient allowed the authors to infer the location of the injury.

Simulation of the Temperature of a Shielding Induction Motor of the Nuclear Main Pump under Different Turbulence Models

Thermal design and the choice of turbulence models are crucial for motors. In this project, the geometrical model of the vertical shielding induction motor for a small nuclear main pump was established by SolidWorks software and the finite volume method was adopted to investigate the temperature of the motor, especially the temperatures of bearings lubricated water. To make the numerical simulation of flow and heat transfer in the rotating clearance of the shielding induction motor more accurate, the effects of four types of different two equation turbulence models on the temperature field of the shielding induction motor were studied. The results showed that different choices of turbulence models had little effect on the temperature of the winding insulation but influenced the temperature of the lower guide bearing lubricating water and the secondary cooling water outlet. The SST k-ω model showed the lowest relative error result of the temperature of the winding insulation and the bearing lubricating water in the primary loop system of the shielding induction motor. The temperature of the clearance water, the spiral tube water and the spiral groove water increased approximately linearly along the axial direction.

Heat dissipation and energy transfer performance of helium face seal with spiral grooves at cryogenic condition

Helium face seal as a key component of cycle engine, its stability and energy consumption have a significant influence on the working efficiency of high parameter energy equipment. Extreme working conditions may make this influence more obviously and seriously. In this paper, a numerical model of helium face seal with spiral grooves is established to investigate the heat dissipation property and energy transfer route at cryogenic condition. The obtained results show that with the growth of rotational speed from 1047.2 to 5236 r/min, the increase rate of heat dissipation for the cases of p0 = 1, 3, and 5 MPa reaches to 148%, 139%, and 129%, respectively. This may be induced by the increasing friction torque due to the high working condition. Moreover, the heat transfer direction is analyzed by analyzing the temperature distribution of helium lubricating film and sealing rings. It is found that the temperature of helium film near the rotor surface demonstrates a slightly increasing trend along the radius direction from outer to inner side. The heat transfer of rotor shows an obvious flow tendency along radial and axial directions, especially at the rotor surface. For the stator, the heat transfer just can be found along radial direction. Finally, the sealing performance of helium face seals are discussed with the increase of sealing pressure and rotational speed. The proposed model may improve the heat utilization of energy equipment and provide guidance for the future structure design of helium face seals in engineering applications at cryogenic condition.

Interface phenomena and bonding mechanism in the new method of cross wedge rolling bimetallic shaft

Since the drive shaft mainly relies on the outer metals to transmit torque, its inner materials are the dead weight. Therefore, a new method of cross wedge rolling (CWR) bimetallic shaft by using bimetallic billet to directly roll-bond laminated shaft was proposed. In this work, we conducted experimental studies including rolling trial, element diffusion, microhardness, fracture morphology and microstructural evolution to investigate the new method. In the rolling trial, the assembled billet with a tolerance of H7/p6 have significantly reduced the ellipse of outer sleeves. The defects such as spiral grooves, knifing grooves, necking, and cracking appeared on the rolled shafts, which are the typical defects of CWR process and can be avoided by optimizing parameters. The TEM observations demonstrate that the 42CrMo/Q235 interfaces can be metallurgically bonded without large cracks and obvious oxides, which agree with the detection results of element diffusion, fracture morphology and microhardness. As the elements diffuse with each other, the interface microhardness was gradually transited, and small dimples appeared on the tensile fracture. Based on experimental results, the bonding mechanism was discussed. The rolling interface is compressed in the radial direction and stretched in tangential direction because of Mannesmann effect. Due to the radial compressive stress is greater than tangential tensile stress, the bimetallic shaft can be roll-bonded eventually. Under the hot CWR deformation, the microstructure of the bimetallic shaft experiences dislocation pile-up, interface bending, grain nucleation and growth, thus realizing metallurgical bonding at micro scale. This new CWR process is efficient and high-performance, which can be extended to have industrial applications in high-end equipments with an economical way.

A comparative study of structural parameters for spiral groove bearing in centrifugal rotary blood pump

In this work, the hydrodynamic characteristics of spiral groove bearing in centrifugal rotary blood pump is investigated for the cases with different structural parameters. The simulation model is proposed based on the CFD technology and the effectiveness of simulation model is demonstrated by the published data. Then, the pressure, load carrying capacity and friction torque are calculated and the characteristics of pressure distribution are analyzed. It is found that the structural parameters of spiral groove would lead to the complex pressure distribution of blood film and the load carrying capacity also changes at the same time. Moreover, the deep analysis of structural characteristics for spiral groove bearing is conducted based on the orthogonal design method, which could improve the computational efficiency of hydrodynamic behavior of spiral groove bearing. And, the mapping relationship between structural parameter and hydrodynamic performance of bearing preferably is also illustrated.

Analysis on the startup characteristics of CO2 dry gas seal based on the F-K slip flow model at high pressure

The gas film of the carbon dioxide (CO2) spiral groove dry gas seal (S-DGS) is less than 3 μm during the startup process, and its opening stability is directly related to the operating performance of S-DGS. The finite difference method is employed to solve numerically the pressure distribution of S-DGS considering the slip flow and the real gas effect. The influence of both effects on the startup characteristics of S-DGS is discussed at different structural parameters. The results show that the slip flow effect inhibits the opening ability of CO2 S-DGS, whereas the real gas effect enhances its opening ability. Within the range of working conditions investigated, the seal processes a lowest startup rotational speed when the spiral angle is 7.5°, and the highest gas film stiffness occurs at small spiral angle when the film thickness is 0.6 μm. However, the relationship between groove number and gas film stiffness is complex which relates to the balance film thickness of the startup process. A higher opening ability can also be achieved by reasonably increasing the balance coefficient.

Minimally Invasive Plate Osteosynthesis (MIPO) Through the Posterior Approach for the Humerus: A Cadaveric Study.

Background Minimally invasive plate osteosynthesis (MIPO) has been effectively used in femur and tibia fractures. MIPO in the humerus is conducted by anterior (most commonly used), lateral, and posterior approaches. However, in the anterior approach, in distal humeral diaphyseal fractures, there is a lack of adequate room for screw placement in the distal fragment for good stability. In such cases, the posterior approach for MIPO may be a propitious treatment method. However, the literatureon MIPO using the posterior approach for humeral diaphyseal fractures is limited. This study aimed to evaluate the feasibility of MIPOthrough the posterior approachand study the association of radial nerve injury with MIPOthrough the posterior approach for the humerus. Methodology This experimental study was conducted in the Department of Orthopedics, Himalayan Institute of Medical Sciences, Dehradun, Uttarakhand, India, and 20 cadaveric arms (10 right and 10 left) of 11 embalmed (formalin) cadavers were included (seven males and four females). Cadavers were placed prone on the dissection table. The posterolateral tip of the acromion and lateral epicondyle of the humerus were used as bony landmarks that were marked under C-Arm (Ziehm Imaging, Orlando, FL, USA) using K wires (Kirschner wires, Surgical Holdings, Essex, UK). Two incisions on theposterior part of the arm were made, and the radial nerve was identified at the proximal incision. After creating a submuscular tunnel, a 3.5 mm extraarticular distal humerallocking compression plate (LCP) was introduced over the posterior surface of the humerus and fixed to the humerus distally with one screw and then adjusted proximally and fixed to the humerus with another screw in the proximal window, followed by placement of couple more screws under C-Arm. After plate fixation, the dissection was completed to meticulously explore the radial nerve. The radial nerve was examined thoroughly for any injury sustained after completion of dissection, from the triangular interval to the lateral intermuscular septum where the nerve enters the anteriorchamber. The position of the radial nerve with respect to plate holes was noted.The distance from the posterolateral tip of the acromion to the lateral epicondyle was measured as humeral length.The medial and lateral points where radial nerve passed over the posterior surface of the humerus were measured from the posterolateral tip of the acromion and compared with the humeral length. Results In this study, the radial nerve was lying over the posterior surface of the humerus for a mean distance of 52.161 ± 5.16 mm. The mean distance at which the radial nerve crossed the medial and lateral borders of the posterior surface of the humerus, measured from the posterolateral tip of the acromion, was 118.34 ± 10.86 mm (40.07% of humeral length) and 170 ± 12.30 mm (57.57% of humeral length), respectively, and the mean humeral length in this study was 295.27 ± 17.94 mm. The radial nerve and its branches were found to be intact in all cases. The radial nerve was related to the fifth, sixth, and seventh holes, with the nerve lying most commonly over the sixth hole (3.5 mm extraarticular distal humerus locking plate). Conclusions The posterior approach of MIPO in humeral fractures is a safe and reliable treatment modality with minimal risk of radial nerve injury. The radial nerve can be safely identified at the spiral groove using the bony landmarks described in our study.

Influence of spherical triggers on axial collapse of tapered tubes

Thin-walled structures are widely used in the design of energy absorbers due to their excellent performance on crashworthiness. Various designs and optimisations on the internal and external structures, materials, and fillers of thin-walled structures are intensively studied. However, traditional thin-walled structures often exhibit excessive initial peak crushing force (IPCF) and large fluctuations in the force-displacement curve under axial load. This paper optimises the traditional thin-walled structure from the perspective of biological structure and proposes a new tapered structure that mimics the shape of a conch shell, named ‘Conch tube’ (CT), which aims to stabilise the crushing process and improve energy absorption capacity. Numerical simulations are used to study the effects of thread pitch and groove width on the deformation mode and performance on crashworthiness of the CT. The results show that the deformation mode of the CTs can be changed from the spiral groove trigger mode to the progressive mode by controlling the thread pitch and groove width. Therefore, by controlling the pitch and groove width, the CT can obtain a lower IPCF. Finally, multi-objective optimisation based on active learning is used to obtain the best CT structure. Compared with the traditional conical tube, the CT has an excellent crashworthiness performance. The effectiveness of the spiral groove structure in enhancing energy absorption and reducing IPCF is confirmed.

Bond behavior of concrete reinforced with high-strength and high-toughness steel bars

To investigate the bond behavior between the ordinary concrete and high-strength and high-toughness (HSHT) steel bars with special spiral grooves on the surface, twenty-one specimens were tested by pull-out tests. The effects of test parameters, including anchorage length, the diameter of HSHT steel bars, cover thickness, stirrup ratio, anchorage form, and the number of spiral grooves, on failure modes, bond-slip curves, bond strength, the relative slip, and critical anchorage length were analyzed. The results show that increasing cover thickness and end-anchorage can significantly improve bond strength. The bond strength of specimens reinforced with HSHT steel bars with six spiral grooves is higher than that of three spiral grooves, and it gradually decreases with increasing the anchorage length. In addition, the decrease of the stirrup spacing can improve bond strength. The addition of stirrups can slow down the descending branches and make the failure modes of specimens change from splitting failure to splitting-pullout failure, indicating that the energy absorption capacity and the ductility of specimens have been improved. The models for bond strength and the slip corresponding to bond strength were established based on the existing models and experimental data. At the same time, coefficients B and D were established based on Wu’s model. The evaluation shows that the proposed model can accurately calculate the bond-slip curves for ascending branches and descending branches, and it can also predict bond-slip curves corresponding to different failure modes.

Near-field manipulation of Tamm plasmon polaritons.

Tamm plasmon polaritons (TPPs) arise from electromagnetic resonant phenomena which appear at the interface between a metallic film and a distributed Bragg reflector. They differ from surface plasmon polaritons (SPPs), since TPPs possess both cavity mode properties and surface plasmon characteristics. In this paper, the propagation properties of TPPs are carefully investigated. With the aid of nanoantenna couplers, polarization-controlled TPP waves can propagate directionally. By combining nanoantenna couplers with Fresnel zone plates, asymmetric double focusing of TPP wave is observed. Moreover, radial unidirectional coupling of the TPP wave can be achieved when the nanoantenna couplers are arranged along a circular or a spiral shape, which shows superior focusing ability compared to a single circular or spiral groove since the electric field intensity at the focal point is 4 times larger. In comparison with SPPs, TPPs possess higher excitation efficiency and lower propagation loss. The numerical investigation shows that TPP waves have great potential in integrated photonics and on-chip devices.

Clinical spectrum, risk factors and electrophysiologic aspect of radial nerve injury

Background and objective: &#x0D; Radial nerve is injured due to a variety of reasons. The objective of this study was to determine the clinical spectrum, risk factors and electrophysiologic aspect of radial nerve injury presenting to a tertiary care hospital in Lahore.&#x0D; Methods: &#x0D; This descriptive prospective cross-sectional study was conducted at department of Neurology, Mayo hospital Lahore from July 2022 to December 2022 and comprised patients with isolated radial nerve injury on the basis of history and clinical examination regardless of their gender, above 15 years of age. NCS/EMG was done on a Japanese machine Nihon Kohden by an expert as per recommended protocol for electrodiagnostic evaluation of a suspected radial nerve injury and interpreted by consultant neurologist.&#x0D; Results: &#x0D; Of 75 patients, 52(69.3%) were males and 23(30.7%) were females. The most common etiology turned out to be misplaced intramuscular injection in 45(60%) of the patients. The site of lesion in most cases was in the spiral groove in 36 (40%) of the patient. Most of the patients i.e. 71(94.7%) had a wrist drop. Evidence of reinnervation was present in 30(40%) of patients.&#x0D; Conclusion: &#x0D; Most cases of radial nerve injury presented with a wrist drop in which the commonest etiology was misplaced intramuscular injection. The site of lesion in most cases turned out to at the level of spiral groove, and the nature of lesion was primarily axonal loss followed by secondary demyelination.

Numerical Simulation of a New Designed Mechanical Seals with Spiral Groove Structures

The spiral groove seal has a strong hydrodynamic effect, but it has poor pollution resistance at the seal’s end and has unfavorable sealing stability. Circumferential waviness seals can use the fluid to clean the surface and have a strong ability to self-rush, protecting the main cover from contamination. This study presents a novel wave-tilt-dam seal design that integrates spiral groove structures to enhance the hydrodynamic performance of circumferential waviness seals. The objective of the research is to evaluate the mechanical effectiveness of this new design through simulation modeling, with a focus on the impact of structural parameters such as rotational speed and seal pressure on the hydrodynamic behavior under various operating conditions. The results of the study indicate that the new structure effectively improves the hydrodynamic performance of the liquid seal, resulting in a significant increase in film rigidity. Additionally, the study identifies optimal values for structural parameters under specific conditions. By addressing the limitations of traditional spiral groove seals and improving their hydrodynamic performance, this research contributes to the advancement of seal technology.

(?)REPTILE COPROLITES FROM THE CAMPANIAN AND MAASTRICHTIAN (LATE CRETACEOUS) OF THE LUHANSK REGION

Problem Statement and Purpose. Vertebrate coprolites have important paleobiological and paleogeographical significance. They are quite common trace fossils, but have almost never attracted the attention of researchers, despite the fact that in the literature there are numerous references to the findings of vertebrate coprolites in the Mesozoic and Cenozoic deposits of Ukraine. The aims of this study are to describe the morphology of coprolites, compare them with morphologically similar vertebrate coprolites, and identify their potential producers. Data &amp; Methods. Two well-preserved specimens of the vertebrate coprolites(Morphotype A and Morphotype B) were found in sediments of the late Campanian Sydorove Formation and early Maastrichtian Konoplyanivka Formation of the northern part of the Donets Basin. Results. Chondrichthyes fishes are excluded from the list of potential producers of coprolites due to the absence of spiral grooves on the surface of a more wellpreserved coprolite and the spiral pattern on its transverse section. These coprolites differ from coprolites of crocodiles in shape, but are close to them in size. One of the coprolites (Morphotype A) probably belongs to a marine reptile of the family Mosasauridae. Mosasaurids were large marine reptiles that appeared and flourishedin the Late Cretaceous (Turonian-Maastrichtian). The morphology of mosasaurids confirms their adaptation to active swimming. They fed mainly on fish, mollusks and other marine reptiles. It was not possible to identify the systematic position of the coprolite producer of Morphotype B. Skeletal remains of mosasaurids are known in the Campanian and Maastrichtian sediments of the Donets Basin. The study results showed that coprolites are important for paleoecological studies, so they deserve a detailed study.

Spiral Groove Entrapment Neuropathy Due to Overuse of The Triceps: A Case Report

Spiral groove entrapment neuropathy is a compression neuropathy that can occur for various reasons due to the superficial course of the radial nerve at the level of the spiral groove. Since repetitive movements play a role in the development mechanism of compression neuropathy, compelling and repetitive movements of the triceps muscle may predispose to spiral groove entrapment neuropathy. In this case, a 61-year-old male patient who developed a low hand after long-term use of a lawnmower is presented. The patient was diagnosed with spiral groove entrapment neuropathy as a result of the physical examination findings performed in our clinic and the requested electroneurophysiological test, magnetic resonance imaging. The patient's motor and sensory deficit completely recovered after 6 weeks as a result of physical therapy and acupuncture treatment.