ABSTRACT
OBJECTIVE@#To explore the effect of Mimics assisted virtual reduction and personalized additional fixation with proximal femoral nail anti rotation in the treatment of unstable intertrochanteric fracture of lateral wall.@*METHODS@#From January 2015 to June 2018, 11 cases of intertrochanteric fracture with unstable lateral wall injury were analyzed retrospectively, including 3 males and 8 females, aged 64 to 81 years old. There were 3 cases of A3.1, 6 cases of A3.2 and 2 cases of A3.3 according to AO classification. All patients underwent CT scanning, according to the CT scanning data, three-dimensional reconstruction of fracture was performed by Mimics soft. Virtual reduction was performed first, and PFNA was implanted after satisfactory reduction. According to the relationship between the fracture characteristics of the lateral wall and the position of the lag screw tail in the lateral wall, 4 cases were treated with PFNA and titanium cable or steel wire, and 7 cases were treated with PFNA and reconstruction locking plate.The quality of reduction and healing were evaluated by follow up, and Harris score of hip joint was performed in the last reexamination.@*RESULTS@#All patients were followed up for 12 to 18 months. No postoperative infection of incision and loosening of internal fixation occurred. The time of fracture healing was 12 to 20 weeks. At the final follow up, Harris score of hip joint was excellent in 6 cases, good in 3 cases and fair in 2 cases.@*CONCLUSION@#The treatment of intertrochanteric fracture of femur with Mimics assisted virtual reduction and PFNA is helpful to preoperative planning and improve the surgical effect.
Subject(s)
Aged , Aged, 80 and over , Female , Humans , Male , Middle Aged , Bone Nails , Fracture Fixation, Intramedullary , Hip Fractures , General Surgery , Retrospective Studies , Software , Treatment OutcomeABSTRACT
Objective To explore the mechanism of ankle sprain varus, a kind of human ankle brace with asymmetric physiological structure which can protect the ankle effectively is designed. Methods The anatomic factors of ankle varus were analyzed firstly, and a kind of ankle brace with asymmetric structure was designed based on asymmetric structure of ankle joint by anatomy. Using Kinect system and Geomagic Studio software, 3D scanning and digital modeling on ankle joint of a male adult were performed, and the ankle model was established by 3D printing technology. With EVA film, silica gel film and wrapped edge copper network as raw materials, two kinds of ankle brace with asymmetric structure were prepared by 3D draping and composite materials processing technology. The shaping properties, tensile properties, fatigue performance, outer fabric breathability and friction of the designed brace were tested. Results The outside of ankle brace with asymmetric structure had good shaping property, low tensile elastic recovery rate. Under the effect of repeated small load, EVA composite materials and silicone composite materials could keep good elastic recovery and effectively bear external varus forces. The results from air permeability and grinding test showed that polyester material was a kind of suitable fabrics for the outer lining material. Conclusions The mechanical properties of ankle brace with asymmetric structure can meet the requirement of ankle varus protection. The fabric of ankle brace can improve moisture permeability and frictional properties.
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Ankle sprains are one of the most common surgical injuries in clinic. In this article, the foot anatomy structure was elaborated, and the biomechanics of ankle ligaments during sports was mainly reviewed. At the same time, the mechanism of ankle sprains was analyzed, the principal means of ankle sprains, prevention and rehabilitation at present were summarized, and the use of ankle braces to prevent ankle sprains as well as its research progress were introduced emphatically. The classification and characteristics of ankle braces were then summarized, and the prevention of ankle sprains and development of ankle braces were prospected. The multiple ankle lateral ligament damage was due to the physiological structure differences between lateral and medial ligaments of the ankle joints, and such structure characteristic should be considered while improving ankle braces and designing new ankle braces. Wearing ankle braces plays a key role in ankle sprains protection, which can shorten the recovery time and avoid re-injury in clinical rehabilitation. For rehabilitation of severe ankle sprains, semi-rigid ankle braces are better than elastic ones.
ABSTRACT
Objective To evaluate the safety of dynamic anterior plate fixation for cervical distractive flexion injuries and compare its rigidity between different types of plate design. Methods Twelve sets of cadaveric calf spine were used in this test. All the specimens were made into distractive flexion injury models (C4-C5) ac- cording to Allen's method. After discectomy and grafting, they were randomized into three groups in which Orion, Codman, and Window instrumentations were used respectively. The stiffness of each construct was tested in flexion, extension, lateral bending and axial torsion conditions sequentially. Results Compared with an intact cervical spine, the range of motion (ROM) of an injured cervical spine increased whatever plate was applied. Orion in- strumentation presented stiffness the closest to that of the normal control, except for less torsional stiffness. Codman instrumentation provided stiffness close to that for normal and Orion groups only in lateral bending. Window's was the weakest mad not enough in all kinds of movement. Conclusions Static anterior fixation is the first choice for cervical injuries. Dynamic plate fixation may sacrifice stiffness to some extent, especially when a shifting kind of design is to be chosen.