In order to characterize the characteristics of pathological tremor of human upper limb, a simulation system of pathological tremor of human arm was provided and its dynamic response was analyzed. Firstly, in this study, a two-degree-of-freedom human arm dynamic model was established and linearized according to the arbitrary initial angle of joints. After solving the analytical solutions of steady-state responses of the joints, the numerical solution was used to verify it. The results of theoretical analysis show that the two natural frequencies of the developed dynamic model are 2.9 Hz and 5.4 Hz, respectively, which meet the characteristic frequency range of pathological tremors. Then, combined with the measured parameters of human arm, a tremor simulation system was built, and the measured results of joint responses are in good agreement with the theoretical and simulation analysis results, which verifies the effectiveness of the theoretical model. The results show that the human arm pathological tremor simulation system designed in this paper can characterize the frequency and response amplitude of the human upper limb pathological tremor. Moreover, the relevant research lays a theoretical foundation and experimental conditions for the subsequent development of wearable tremor suppression devices.
Humans ; Tremor/physiopathology* ; Computer Simulation ; Arm/physiopathology* ; Joints/physiopathology* ; Biomechanical Phenomena ; Upper Extremity/physiopathology* ; Models, Biological

OBJECTIVE: To explore the effectiveness of partial translocation of flexor carpi radialis tendon in the treatment of traumatic dislocation of the first carpometacarpal joint. METHODS: The clinical data of 6 patients with traumatic dislocation of the first carpometacarpal joint who met the selection criteria between March 2020 and June 2024 were retrospectively analyzed. There were 3 males and 3 females with an average age of 33.5 years (range, 16-42 years). All the 6 cases were treated with plaster immobilization for 4-6 weeks, and the time from injury to operation was 6-12 weeks, with an average of 8.8 weeks. All patients underwent reconstruction of the metacarpophalangeal anterior oblique ligament and dorsal posterior oblique ligament of the first carpometacarpal joint with partial translocation of flexor carpi radialis tendon. The pain relief was evaluated by visual analogue scale (VAS) score before and after operation, and the pinch force, palmar abduction and radial abduction angles of the affected side and the healthy side were recorded before and after operation, and the ratio of the above indexes between the affected side and the healthy side was calculated to evaluate the effectiveness. RESULTS: All the incisions healed by first intention after operation, and there was no complication related to operation such as neurovascular injury. All patients were followed up 6-19 months (mean, 12.7 months). The range of motion of the thumb on the affected side was the same as that on the healthy side, the first carpometacarpal joint was stable without recurrent dislocation and pain. At last follow-up, the VAS score, the pinch force of the affected side, the abduction angle of the palmar side of the affected thumb, the abduction angle of the radial side of the affected thumb, and the pinch force ratio, the palmar abduction angle ratio of the thumb, and the radial abduction angle ratio of the thumb of the affected side to the healthy side significantly improved when compared with those before operation ( P<0.05). CONCLUSION Partial translocation of the flexor carpi radialis tendon to reconstruct the metacarpophalangeal and dorsal radial ligaments for the treatment of traumatic dislocation of the first carpometacarpal joint is a reliable surgical method.
Humans ; Carpometacarpal Joints/surgery* ; Male ; Female ; Adult ; Adolescent ; Retrospective Studies ; Joint Dislocations/surgery* ; Young Adult ; Tendons/surgery* ; Tendon Transfer/methods* ; Plastic Surgery Procedures/methods* ; Treatment Outcome ; Range of Motion, Articular ; Ligaments, Articular/injuries*

OBJECTIVE: To evaluate the short-term effectiveness of Ilizarov technique combined with steel needle internal fixation in treating Charcot neuroarthropathy (CN) of the foot and ankle. METHODS: Between June 2020 and December 2023, 12 patients with Eichenholtz stage Ⅲ CN of the foot and ankle were treated with Ilizarov technique and steel needle internal fixation. There were 9 males and 3 females with an average age of 48.6 years (range, 19-66 years). The disease duration ranged from 1 to 16 months (mean, 6.8 months). Ankle joint involvement predominated in 7 cases, while midfoot involvement occurred in 5 cases; 3 cases presented with skin ulceration and soft tissue infection. Preoperative American Orthopedic Foot and Ankle Society (AOFAS) score was 31.2±9.0, 36-Item Short-Form Health Survey (SF-36)-Physical Component Summary (PCS) score was 32.6±6.8, and Mental Component Summary (MCS) score was 47.8±8.4. Postoperative assessments included wound healing, regular X-ray film/CT evaluations of fusion status, and effectiveness via AOFAS and SF-36-PCS, MCS scores. RESULTS: All operations were successfully completed without neurovascular complication. Two patients experienced delayed wound healing requiring intervention, and the others achieved primary healing. All patients were followed up 15-43 months (mean, 23.3 months). Imaging confirmed successful joint fusion within 13-21 weeks (mean, 16.8 weeks). At last follow-up, the AOFAS score was 72.5±6.4, and the SF-36-PCS and MCS scores were 63.2±8.4 and 76.7±5.3, respectively, all of which improved compared to preoperative levels, with significant differences ( P<0.05). CONCLUSION Ilizarov technique combined with steel needle internal fixation effectively restores walking function and achieves satisfactory short-term effectiveness in CN of the foot and ankle.
Humans ; Middle Aged ; Male ; Female ; Adult ; Ilizarov Technique ; Arthropathy, Neurogenic/surgery* ; Aged ; Ankle Joint/surgery* ; Treatment Outcome ; Needles ; Fracture Fixation, Internal/instrumentation* ; Steel ; Young Adult ; Foot Joints/surgery*

OBJECTIVE: To evaluate the effectiveness of free medial femoral condyle (MFC) functional chimeric perforator flap (FCPF) transplantation in reconstructing joint function by repairing concomitant osteochondral defects and soft tissue defect in hand and foot joints. METHODS: A retrospective analysis was performed on 6 patients (5 males, 1 female; mean age of 33.4 years, range 21-56 years) with traumatic osteochondral joint defects and associated tendon, nerve, and soft tissue defects treated between January 2019 and November 2024. Defect locations included metacarpal heads (n=2), metacarpophalangeal joint (n=1), first metatarsal head (n=1), base of first proximal phalanx (n=1), and talar head (n=1), with soft tissue defects in all cases. Osteochondral defect sizes ranged from 1.5 cm×1.2 cm×0.7 cm to 4.0 cm×0.6 cm×0.6 cm, and skin defects ranged from 4 cm×3 cm to 13 cm×4 cm. The stage Ⅰ treatment included debridement, antibiotic-loaded bone cement filling of bone-cartilage defects, fracture internal fixation, and coverage with vacuum sealing drainage. Stage Ⅱ involved harvesting a free MFC- FCPF included an osteochondral flap (range of 1.5 cm×1.2 cm×0.7 cm to 4.0 cm×0.6 cm×0.6 cm), gracilis and/or semitendinosus tendon grafts (length of 4-13 cm), saphenous nerve graft (length of 3.5-4.0 cm), and a perforator skin flap (range of 6 cm×4 cm to 14 cm×6 cm), each with independent vascular supply. The flap was transplanted to reconstruct joint function. Donor sites were closed primarily or with skin grafting. Flap survival was monitored postoperatively. Radiographic assessment was used to evaluate bone/joint healing. At last follow-up, the joint function recovery was assessed. RESULTS: All 6 MFC-FCPF survived completely, with primary healing of wounds and donor sites. All patients were followed up 6-44 months (mean, 23.5 months). The flaps at metacarpophalangeal joint in 1 case and at ankle joint in 1 case were treated with degreasing repair because of their bulky appearance, while the other flaps had good appearance and texture. At 3 months after operation, the visual analogue scale (VAS) score for pain during joint movement of recipient site was 0-2, with an average of 0.7; at last follow-up, the VAS score of the donor site was 0-1, with an average of 0.3. According to the Paley fracture healing scoring system, the osteochondral healing of all the 6 patients was excellent. The range of motion of the metacarpophalangeal joint in 3 cases was 75%, 90%, and 100% of contralateral side respectively, the range of motion of the metatarsophalangeal joint in 2 cases was 65% and 95% of contralateral side respectively, and the range of motion of the ankle joint in 1 case was 90% of contralateral side. The hand function was evaluated as excellent in 2 cases and good in 1 case according to the upper limb function evaluation standard of the Chinese Medical Association Hand Surgery Society, and the foot function was evaluated as excellent in 2 cases and fair in 1 case according to the Maryland foot function score of 93, 91, and 69, respectively. The International Knee Documentation Committee (IKDC) score of 6 knees was 91-99, with an average of 95.2. CONCLUSION The free MFC-FCPF enables precise anatomical joint reconstruction with three-dimensional restoration of tendon, nerve, capsule, and soft tissue defects, effectively restoring joint function and improving quality of life.
Humans ; Male ; Adult ; Female ; Middle Aged ; Retrospective Studies ; Plastic Surgery Procedures/methods* ; Soft Tissue Injuries/surgery* ; Perforator Flap/blood supply* ; Femur/surgery* ; Young Adult ; Foot Joints/injuries* ; Treatment Outcome

OBJECTIVE: To evaluate the mid-term efficacy of talonavicular joint fusion alone combined with navicular stress adjustment in Müller-Weiss disease with significant paradoxical flatfoot deformity. METHODS: Between January 2016 and March 2021, a total of 13 patients diagnosed with Müller-Weiss disease underwent simple talonavicular joint fusion combined with navicular stress adjustmentadjustment.Among them, 5 patients were male and 8 patients were female;age ranged from 42 to 67 years old. The duration of the disease ranged from 8 to 20 years. According to Maceira staging system, 5 patients were in stage III and 8 patients were in stage IV. The American Orthopaedic Foot and Ankle Society (AOFAS) midfoot score, visual analogue scale (VAS), and foot length were evaluated preoperatively and 10 months postoperatively. Additionally, the talonavicular coverage angle, the talus-first metatarsal angle, and the calcaneal inclination angle were assessed preoperatively and 6 months postoperatively. RESULTS: All 13 patients were followed up a period ranging from 24 to 40 months. All patients achieved clinical healing within a period of 3 to 6 months. However, one patient experienced a screw fracture. The VAS decreased from a range of 3 to 7 points preoperatively to a range of 0 to 2 points at the 10 months postoperative. The AOFAS midfoot score improved from a preoperative range of 12 to 66 points to a range of 72 to 100 points at the 10 months postoperative. Based on the AOFAS midfoot score evaluated at 10 months postoperatively, the outcomes were rated as excellent in 3 feet, good in 6 feet, and fair in 4 feet. The talo-navicular coverage angle, the preoperative talus-first metatarsal angle, calcaneal inclination angle were 14.3° to 33.4°, -4.6° to -19.6°, and 3.0°to 16.4° respectively. Six months postoperatively, these angles improved to 2.7°to 9.6°, -8.4°to 1.1°, and 18.8°to 24.9°respectively. Additionally, the foot length increased by 0 to 6 mm at 10 months post-surgery. CONCLUSION Simple talonavicular arthrodesis combined with scaphoid stress adjustment has satisfactory clinical efficacy in Müller-Weiss disease in terms of deformity, foot length, foot function and pain.
Humans ; Male ; Female ; Adult ; Middle Aged ; Arthrodesis/methods* ; Aged ; Flatfoot/physiopathology* ; Tarsal Bones/physiopathology* ; Tarsal Joints/surgery* ; Treatment Outcome

OBJECTIVE: To analyze radiological characteristics of Muller-Weiss disease, evaluate the clinical value of the imaging examination in diagnosis of Muller-Weiss disease. METHODS: The imaging data of 26 patients with Muller-Weiss disease were collected from September 2015 to August 2020, including 7 males and 19 females, aged 43 to 68 years old with an average of (52.7±4.6) years old. In the X-ray examination observed the shape and position of the navicular bone. The talar-first metatarsal angle(TFM) was measured on the weight-bearing anteroposterior radiograph. The arch angle and angle between mid-axis of talus and mid-axis of the first metatarsal(Meary angle) were measured on the weight-bearing lateral radiographs. The morphology, density, adjacent joint space and position of the navicular bone were evaluated by computed tomography(CT), and magnetic resonance imaging(MRI) was used to observe the shape, signal, cartilage and surrounding soft tissue changes of the navicular bone. RESULTS: Among 26 patients, 21 cases were unilateral and 5 cases were bilateral;X-ray examination showed that the lateral part of navicular bone of foot was compressed and flattened, showing"comma like"or"drop like", navicular moved to the medial side, partial fragmentation of bone, peripheral articular hyperplasia, uneven density and narrowing of relationship gap. According to Meary angle and deformity degree of the affected foot on the lateral X-ray of the load-bearing foot, Maceira staging was performed. There were 0 cases in stageⅠ, 2 cases in stage Ⅱ, 11 cases in stage Ⅲ, 9 cases in stage Ⅳand 4 cases in stage Ⅴ. CT examination showed bone fragmentation, medial displacement of navicular bone and formation of the talocalcaneal joint. MRI examination showed the irregular shape and uneven signal of navicular bone, narrowing of joint space, talocalcaneal joint surface hyperplasia and cartilage destruction, tarsal joint effusion and swelling of surrounding soft tissue. CONCLUSION Muller-Weiss disease has specific imaging manifestation, and an accurate diagnosis can be made based on the patient's age, gender, and clinincal history. Preoperative imaging examination can stage the disease, help clinicians to formulate better surgical plans, and postoperative imaging examination can better evaluate the surgical effect.
Adult ; Aged ; Bone Diseases/diagnostic imaging* ; Cartilage Diseases ; Female ; Foot Diseases/diagnostic imaging* ; Humans ; Hyperplasia/pathology* ; Male ; Middle Aged ; Talus/pathology* ; Tarsal Bones/surgery* ; Tarsal Joints

OBJECTIVE: To explore clinical effect of early incision and decompression combined with screw fixation in treating Lisfranc injury and foot osteofascial compartment syndrome. METHODS: Clinical data of 5 patients with Lisfranc injury and foot osteofascial compartment syndrome were retrospective analysized from January 2017 to December 2018, including 4 males and 1 female, aged from 19 to 62 years old. All patients were suffered from closed injuries. The time from injury to treatment ranged from 1 to 14 h. According to Myerson classification, 1 patient was type A, 1 patient was type B, and 3 patients were type C. All patients were performed early incision decompression and screw fixation. Maryland foot functional scoring standard at 12 months after opertaion was used to evaluate clinical effect. RESULTS: All patients were followed up for 10 to 48 months. All fractures were achieved bone union, and healing time ranged from 3 to 9 months. All metatarsal and tarsal joints were reached to anatomical reduction. No infection, osteomyelitis, loosening or breaking of internal fixation occurred. Postopertaive Maryland foot function score at 12 months was from 44 to 97, and 2 patients got excellent result, 2 good, and 1 poor. CONCLUSION Early incision and decompression with screw fixation for the treatment of Lisfranc injury and foot osteofascial compartment syndrome, which has advantages of simple opertaion, thoroughly decompression, screw fixation does not occupy space, stable decompression and fixation, and could receive satisfied clinical effect.
Adult ; Bone Screws ; Compartment Syndromes/surgery* ; Decompression ; Female ; Foot Injuries ; Fracture Fixation, Internal ; Fractures, Bone/surgery* ; Humans ; Male ; Middle Aged ; Retrospective Studies ; Tarsal Joints ; Treatment Outcome ; Young Adult

Robots are being used to assist the recovery of walking ability for patients with neurologic disorders. This study aimed to evaluate the feasibility and functional improvement of training with robot-assisted gait training (RAGT) using the Morning Walk®, an end-effector type robot using footplates and saddle seat support. A total of 189 individuals (65.1% men, 34.9% women; mean age, 53.2 years; age range: 5–87 years) with brain lesions, spinal cord injuries, Parkinson's disease, peripheral neuropathies, and pediatric patients were involved in this retrospectively registered clinical trial. Each participant performed 30 minutes of RAGT, five times a week, for a total of 24 sessions. Failure was defined as an inability to complete all 24 sessions, and the reasons for discontinuation were analyzed. Parameters of Medical Research Council scales and Functional Ambulation Categories were analyzed before and after RAGT training. Among the 189 patients, 22 (11.6%) failed to complete the RAGT. The reasons included decreased cooperation, musculoskeletal pain, saddle seat discomfort, excessive body-weight support, joint spasticity or restricted joint motion, urinary incontinence from an indwelling urinary catheter, and fatigue. Comparison between the pre- and post-training motor and ambulatory functions showed significant improvement. The result of the study indicates that the Morning Walk® is feasible and safe and useful for functional improvement in patients with various neurologic disordersTRIAL REGISTRATION: Clinical Research Information Service Identifier: KCT0003627
Brain ; Fatigue ; Female ; Gait ; Humans ; Information Services ; Joints ; Male ; Muscle Spasticity ; Musculoskeletal Pain ; Nervous System Diseases ; Parkinson Disease ; Peripheral Nervous System Diseases ; Retrospective Studies ; Spinal Cord Injuries ; Urinary Catheters ; Urinary Incontinence ; Walking ; Weights and Measures

Chemoradiotherapy ; Cohort Studies ; Epidemiology ; Gynecology ; Humans ; Joints ; Methods ; Neoplasm Metastasis ; Obstetrics ; Population Characteristics ; Propensity Score ; Proportional Hazards Models ; Prospective Studies ; Retrospective Studies ; Risk Factors ; Survival Rate ; Uterine Cervical Neoplasms

Recently, as the elderly population increases, the incidence of total knee arthroplasty has increased, with a concomitant increase in the frequency of periprosthetic fractures. To determine the treatment plan for fractures, the treatment method should be determined by the patient's age, osteoporosis, fixation status of the implant, and type of fracture. In recent years, operative treatment with reduction and stable fixation, rather than non-operative treatment, was used to promote early joint movement and gait. On the other hand, it is necessary to select an appropriate operative method to reduce complications of surgery, such as nonunion and infection, and expect a good prognosis. In this review, periprosthetic fractures were divided into femur, tibia, and patella fractures, and their causes, risk factors, classification, and treatment are discussed.
Aged ; Arthroplasty ; Arthroplasty, Replacement, Knee ; Classification ; Femur ; Gait ; Hand ; Humans ; Incidence ; Joints ; Knee ; Methods ; Osteoporosis ; Patella ; Periprosthetic Fractures ; Prognosis ; Risk Factors ; Tibia