A micro silicone oil liquid spring was designed and manufactured in this article. The performance of the liquid spring was studied by simulation analysis and mechanical test. A self-force source power-assisted knee orthosis was designed based on the liquid spring. This power-assisted knee orthosis can convert the kinetic energy of knee flexion into the elastic potential energy of liquid spring for storage, and release elastic potential energy to generate assisted torque which drives the knee joint for extension. The results showed that the average maximum reset force of the liquid spring was 1 240 N, and the average maximum assisted torque for the knee joint was 29.8 N·m. A musculoskeletal multibody dynamic model was used to analyze the biomechanical effect of the knee orthosis on the joint during knee bending (90°knee flexion). The results showed that the power-assisted knee orthosis could effectively reduce the biomechanical load of the knee joint for the user with a body weight of 80 kg. The maximum forces of the femoral-tibial joint force, patellar-femoral joint force, and quadriceps-ligament force were reduced by 24.5%, 23.8%, and 21.2%, respectively. The power-assisted knee orthosis designed in this article provides sufficient assisted torque for the knee joint. It lays a foundation for the subsequent commercial application due to its small size and lightweight.
Biomechanical Phenomena ; Knee Joint ; Femur ; Ligaments ; Orthotic Devices

A 3D printing based wrist orthosis device was developed. After collecting the contour information of the carpal and metacarpophalangeal joints of the patients with a 3D scanner, the wrist orthotics were designed to meet the individual needs of the patients according to the relevant requirements of biomechanics. Choose TPU (thermoplastic polyurethanes) materials for preparation of 3D printing. It can functionally assist the smart brace after stroke patients with hemiplegia early rehabilitation training, the use of orthoses carry MPU6050 inertial sensor, magnetometer, time module device such as a sensor and monitor its movements and record the training time, ensure safe efficient rehabilitation training, help patients return to a normal life as soon as possible.
Humans ; Orthotic Devices ; Printing, Three-Dimensional ; Stroke ; Wrist ; Wrist Joint

INTRODUCTION: Developmental dysplasia of the hip (DDH) is a common orthopaedic condition at birth. Non-surgical management with the Pavlik harness can effectively treat DDH in the newborn by providing an early clinical diagnosis, but open surgeries continue to be performed. We aimed to elucidate the reasons for this. METHODS: A retrospective review was performed of all open surgeries related to DDH from 2006 to 2016. Patients were either born at our institution (Group 1) or outside of it (Group 2). All Group 1 newborns were routinely screened for DDH at birth. RESULTS: 27 patients (Group 1: n = 5, Group 2: n = 22) presented at age 25 ± 19 months. Left-sided DDH (n = 21, 77.8%) and female infants (n = 22, 81.5%) were more common. The mean age at surgery was 40 ± 31 months. The most commonly performed procedure was soft tissue release open reduction with acetabuloplasty (n = 20, 74.1%). Gender, site, median age at presentation and at surgery, and prevalence of risk factors were similar for both groups. Both groups were mostly made up of late presenters (> 3 months; p = 0.34). A few patients had undergone prior treatment (p = 0.64). Newborn screening was the only significantly different variable between the groups (p < 0.01). CONCLUSION Lack of institutionalised newborn clinical screening appears to be the root cause of late presentation of DDH leading to open surgery for its management. We recommend quality institutionalised newborn clinical screening to reduce the number of late presentations.
Acetabuloplasty ; adverse effects ; methods ; Child ; Child, Preschool ; Early Diagnosis ; Female ; Hip Dislocation, Congenital ; surgery ; Hip Joint ; surgery ; Humans ; Infant ; Infant, Newborn ; Male ; Neonatal Screening ; methods ; Orthotic Devices ; Prevalence ; Retrospective Studies ; Risk Factors ; Unnecessary Procedures

Forefoot disorders are often seen in clinical practice. Forefoot deformity and pain can deteriorate gait function and decrease quality of life. This review presents common forefoot disorders and conservative treatment using an insole or orthosis. Metatarsalgia is a painful foot condition affecting the metatarsal (MT) region of the foot. A MT pad, MT bar, or forefoot cushion can be used to alleviate MT pain. Hallux valgus is a deformity characterized by medial deviation of the first MT and lateral deviation of the hallux. A toe spreader, valgus splint, and bunion shield are commonly applied to patients with hallux valgus. Hallux limitus and hallux rigidus refer to painful limitations of dorsiflexion of the first metatarsophalangeal joint. A kinetic wedge foot orthosis or rocker sole can help relieve symptoms from hallux limitus or rigidus. Hammer, claw, and mallet toes are sagittal plane deformities of the lesser toes. Toe sleeve or padding can be applied over high-pressure areas in the proximal or distal interphalangeal joints or under the MT heads. An MT off-loading insole can also be used to alleviate symptoms following lesser toe deformities. Morton's neuroma is a benign neuroma of an intermetatarsal plantar nerve that leads to a painful condition affecting the MT area. The MT bar, the plantar pad, or a more cushioned insole would be useful. In addition, patients with any of the above various forefoot disorders should avoid tight-fitting or high-heeled shoes. Applying an insole or orthosis and wearing proper shoes can be beneficial for managing forefoot disorders.
Animals ; Congenital Abnormalities ; Foot ; Foot Orthoses ; Gait ; Hallux ; Hallux Limitus ; Hallux Rigidus ; Hallux Valgus ; Hammer Toe Syndrome ; Head ; Hoof and Claw ; Humans ; Joints ; Metatarsal Bones ; Metatarsalgia ; Metatarsophalangeal Joint ; Neuroma ; Orthotic Devices ; Quality of Life ; Shoes ; Splints ; Toes

BACKGROUND: Traditionally, conservative management with an offloading orthosis, such as total contact cast (TCC), has been the standard of care for midfoot Charcot arthropathy. Considering complications of TCC and surgery, we treated midfoot Charcot arthropathy without TCC in our patients. The purpose of this study was to report clinical and radiological outcomes of conservative management of midfoot Charcot arthropathy. METHODS: A total of 34 patients (38 feet) who were diagnosed as having midfoot Charcot arthropathy between 2006 and 2014 were included. Patients started full weight bearing ambulation in a hard-soled shoe immediately after diagnosis. Outcomes such as progression of arch collapse, bony prominence, ulcer occurrence, limb amputation, and changes in Charcot stage were evaluated. RESULTS: Of 38 feet, arch collapse was observed in four while progression of bottom bump of the midfoot was observed in five feet. Foot ulcers related to bony bumps were found in two feet. CONCLUSIONS: Conservative treatment without restriction of ambulation is recommended for midfoot Charcot arthropathy because it is rarely progressive, unlike hindfoot-ankle arthropathy. In some cases, simple bumpectomy can be required to prevent catastrophic infection.
Amputation ; Arthropathy, Neurogenic ; Diagnosis ; Extremities ; Foot ; Foot Ulcer ; Humans ; Orthotic Devices ; Shoes ; Standard of Care ; Ulcer ; Walking ; Weight-Bearing

PURPOSE: To investigate the influence of the size of low intensity zone (LIZ) (T1 image) on the vertebral body and the increase in the compression rate in patients with osteoporotic vertebral compression fracture. MATERIALS AND METHODS: In a retrospective study, 187 patients (198 segments) who were followed-up for at least 3 months and diagnosed with thoracolumbar vertebral compression fracture between October 2011 and October 2016, and treated with conservative therapies, such as bed rest and thoraco-lumbar-sacral orthosis. We measured the size of the vertebral LIZ, and fractures on the upper and lower endplates were observed on the initial magnetic resonance imaging. We analyzed the correlation with the increase in compression rate at the last follow-up. Comparisons of the increase in the compression rate were analyzed through a correlation analysis. RESULTS: The larger the size of the LIZ the greater the difference in the increase of the compression rate. The group with the initially LIZ (80%–100%) was significantly increased to 23.87%±17.90% (p=0.007). In case of fracture of upper and lower endplates, an increase in the compression rate was 19.39%±12.59% in the upper endplate fracture, which was significantly higher than that in the absence of endplate fracture (p=0.002). CONCLUSION: The larger the size of the LIZ (T1 image) and superior endplate fracture observed on the initial magnetic resonance imaging after fracture, the greater the increase in the compression rate. In particular, when the size of the LIZ is greater than 80%, the compression rate was significantly increased.
Bed Rest ; Follow-Up Studies ; Fractures, Compression* ; Humans ; Magnetic Resonance Imaging* ; Orthotic Devices ; Osteoporosis ; Retrospective Studies

The application of three-dimensional (3D) printing is growing explosively in the medical field, and is especially widespread in the clinical use of fabricating upper limb orthosis and prosthesis. Advantages of 3D-printed orthosis compared to conventional ones include its lower cost, easier modification, and faster fabrication. Hands are the most common body parts involved with burn victims and one of the main complications of hand burns are finger joint contractures. Applying orthotic devices such as finger splints are a well-established essential element of burn care. In spite of the rapid evolution of the clinical use of 3D printing, to our knowledge, its application to hand burn patients has not yet been reported. In this study, the authors present a series of patients with hand burn injuries whose orthotic needs were fulfilled with the application of 3D-printed finger splints.
Burns* ; Contracture ; Finger Joint ; Fingers* ; Hand* ; Human Body ; Humans ; Orthotic Devices ; Printing, Three-Dimensional ; Prostheses and Implants ; Splints* ; Upper Extremity

PURPOSE: An axillary crutch is the most commonly used assistive device in foot and ankle patients who require nonweightbearing. On the other hand, its use frequently induces axillary or wrist pain and critical neurovascular injuries have been reported in several studies. This study compared the clinical outcomes of patients using the knee walker and axillary crutch. MATERIALS AND METHODS: A retrospective analysis was performed comparing the utility of a knee walker and axillary crutch as a nonweightbearing ambulatory aid for 62 foot and ankle patients treated between November 2016 and March 2018. A comparative study of the two orthosis could be performed because all the patients temporarily used an axillary crutch before or after the use of a knee walker. A demographic study and comparative analysis based on the visual analogue scale (VAS) satisfaction score (0~100), complications, and fall down history were evaluated. Furthermore, under the assumption of having retreatment, their preference of orthosis between the knee walker and axillary crutch was investigated. RESULTS: The mean age of the patients was 36.5 and the mean duration of ambulation with a knee walker and axillary crutch were 5.2 and 2.4 weeks. The VAS satisfaction score of the knee walker and crutch was 88.8 and 27.5, respectively (p < 0.05). The most frequent complications of the knee walker and crutch were ipsilateral knee pain (6 cases) and axillary or wrist pain (56 cases), respectively. No case of falling down occurred during knee walker ambulation, but there were two cases of crutch ambulation. Fifty-eight patients (93.5%) preferred the knee walker and four patients (6.5%) preferred a crutch. CONCLUSION: Compared to the axillary crutch, the knee walker afforded lower complication and higher satisfaction. Most patients preferred the knee walker to a crutch. Therefore, the knee walker is an efficient and safe orthosis for foot and ankle patients who require nonweightbearing.
Accidental Falls ; Ankle* ; Foot* ; Hand ; Humans ; Knee* ; Orthotic Devices ; Retreatment ; Retrospective Studies ; Self-Help Devices ; Walkers* ; Walking ; Wrist

OBJECTIVE: To investigate the clinical effectiveness of and parents’ perspectives on cranial-molding orthotic treatment. METHODS: Medical charts were reviewed for 82 infants treated for plagiocephaly with cranial-molding orthoses in our clinic from April 2012 to July 2016 retrospectively. Infants who were clinically diagnosed with positional plagiocephaly and had a Cranial Vault Asymmetry Index (CVAI) of more than 3.5% were included. Pre- and post-treatment CVAI was obtained by three-dimensional head-surface laser scan. Parents’ perceptions of good outcome (satisfaction) were evaluated with the Goal Attainment Scale (GAS). The GAS score assessed how much the parent felt that his or her initial goal for correcting the skull asymmetry was achieved after the treatment. RESULTS: The compliance with cranial-molding orthoses was 90.2% (74 of 82 infants). There were 53 infants (65% of the 82 infants) who had adverse events with the cranial-molding orthoses during the study. Heat rash was found in 29 cases (35.4%) and was the most common adverse event. The mean GAS T-score was 51.9±10.2. A GAS T-score of 0 or more was identified for 71.6% of parents. The GAS T-score was significantly related to the age (p < 0.001), the initial CVAI, and the difference of CVAI during the treatment (p < 0.001). CONCLUSION: Parents’ perception of good outcome was correlated with the anthropometric improvement in cranialmolding orthotic treatment in infants with plagiocephaly. A high percentage of parents felt that the treatment met their initial goals in spite of a high occurrence of adverse events.
Compliance ; Exanthema ; Hot Temperature ; Humans ; Infant* ; Orthotic Devices* ; Parents ; Plagiocephaly* ; Plagiocephaly, Nonsynostotic ; Retrospective Studies ; Skull ; Treatment Outcome*

Orthopaedics is an area where 3-dimensional (3D) printing technology is most likely to be utilized because it has been used to treat a range of diseases of the whole body. For arthritis, spinal diseases, trauma, deformities, and tumors, 3D printing can be used in the form of anatomical models, surgical guides, metal implants, bio-ceramic body reconstruction, and orthosis. In particular, in orthopaedic oncology, patients have a wide variety of tumor locations, but limited options for the limb salvage surgery have resulted in many complications. Currently, 3D printing personalized implants can be fabricated easily in a short time, and it is anticipated that all bone tumors in various surgical sites will be reconstructed properly. An improvement of 3D printing technology in the healthcare field requires close cooperation with many professionals in the design, printing, and validation processes. The government, which has determined that it can promote the development of 3D printing-related industries in other fields by leading the use of 3D printing in the medical field, is also actively supporting with an emphasis on promotion rather than regulation. In this review, the experience of using 3D printing technology for bone tumor surgery was shared, expecting orthopaedic surgeons to lead 3D printing in the medical field.
Congenital Abnormalities ; Delivery of Health Care ; Humans ; Limb Salvage ; Models, Anatomic ; Orthotic Devices ; Printing, Three-Dimensional* ; Spondylarthritis ; Surgeons