目的:探讨股骨髁解剖钢板、L钢板及DCS在治疗股骨远端骨折中的应用价值。方法:采用股骨髁解剖钢板内固定治疗股骨远端骨折26例,L钢板内固定治疗股骨远端骨折32例, DCS内固定治疗股骨远端骨折21例。结果:79例经3～15月随访,其中采用解剖钢板26例中23例疗效满意,优良率为885％。采用L钢板32例中23例疗效满意,优良率为719％采用DCS 21例中17例疗效满意,优良率为809％。结论:解剖钢板内固定是治疗股骨远端骨折较为有效的方法,是预防膝关节并发症的积极措施。
Objective To compare the biomechanical stability of Kirschner wire and tension band wiring, reconstruction plate combined with tension band wiring, and olecranon anatomical plate in fixing proximal ulna combined with olecranon fracture, so as to provide the theoretical evidence for clinical selection of internal fixation. Methods Eight specimens of elbow joints and ligaments were taken from eight fresh male adult cadaveric elbows (aged 26-43 years, mean 34.8 years) donated voluntarily. The model of proximal ulna combined with olecranon fracture was made by an osteotomy in each specimen. Fracture end was fixed successively by Kirschner wire and tension band wiring (group A), reconstruction plate combined with tension band wiring (group B), and olecranon anatomical plate (group C), respectively. The biomechanical test was performed for monopodium compression experiments, and load-displacement curves were obtained. The stability of the fixation was evaluated according to the load value when the compression displacement of fracture segment was 2 mm. Results No Kirschner wire withdrawal, broken plate and screw, loosening and specimens destruction were observed. The load-displacement curves of 3 groups showed that the displacement increased gradually with increasing load, while the curve slope of groups B and C was significantly higher than that of group A. When the compression displacement was 2 mm, the load values of groups A, B, and C were (218.6 ± 66.9), (560.3 ± 116.1), and (577.2 ± 137.6) N, respectively; the load values of groups B and C were significantly higher than that of group A (P lt; 0.05), but no significant difference was observed between groups B and C (t=0.305, P=0.763). Conclusion The proximal ulna combined with olecranon fracture is unstable. Reconstruction plate combined with tension band wiring and olecranon anatomical plate can meet the requirement of fracture fixation, so they are favorable options for proximal ulna combined with olecranon fracture. Kirschner wire and tension band wiring is not a stable fixation, therefore, it should not be only used for proximal ulna combined with olecranon fracture.
ObjectiveTo evaluate the effectiveness of posteromedial double plates in the treatment of complex olecranal fracture. MethodsBetween September 2011 and July 2015, 13 patients with complex olecranal fractures were treated with posterior olecranon locking compression plate and medial mini-plate. There were 8 males and 5 females with an average age of 41.6 years (range, 22-68 years). Injury was caused by traffic accident in 4 cases, falling from height in 6 cases, and crush by object in 3 cases. According to the Mayo classification, fracture was rated as Mayo type ⅡB in 5 cases and as Mayo type ⅢB in 8 cases. Of 13 cases, 7 had Regan-Morrey type Ⅲ coronoid fractures, including 5 anterior dislocations of the elbow joint and 2 posterior dislocations. The time between injury and admission ranged from 1.5 to 10.0 hours (mean, 5.7 hours). At last follow-up, the elbow function was assessed according to the Broberg-Morrey evaluation criteria. X-ray films was performed to observe fracture healing. ResultsAll incisions healed at first stage and no neural complications occurred. The patients were followed up 9-38 months (mean, 22.1 months). All patients achieved bone union at 3.0-5.5 months (mean, 3.7 months) according to X-ray results. Subluxation of radial head and mild heterotopic ossification occurred in 1 patient respectively, who had no uncomfortable symptoms of movement disorder, elbow instability and pain, and no special management was performed. At last follow-up, the flexion and extension range of motion (ROM) of the elbow was 95-130° (mean, 116.4°); the rotation ROM of the forearm was 150-175° (mean, 170.8°); and the elbow function was excellent in 4 cases, good in 7 cases, and fair in 2 cases, and the excellent and good rate was 84.6%. No internal fixation failure, elbow stiffness, or traumatic arthritis occurred. ConclusionFor complex olecranal fractures, an early and stable anatomic reconstruction of trochlear notch in the olecranon with posterior olecranon locking compression plate and medial mini-plate can obtain good effectiveness in joint functions.
Objective To develop an anatomical locking plate in accordance with the anatomical characteristics of the sternoclavicular joint, which is reliable fixation and easy to operate, so as to provide an ideal internal fixation device for the treatment of sternoclavicular joint dislocation or peripheral fractures. Methods Gross measurement and CT measurement were performed on the 8 adult antiseptic and moist cadaver specimens (16 sides) to measure the parameters of surrounding bone structure of the sternoclavicular joint. The parameters included the thickness of presternum, sternal notch width, anteroposterior diameter of proximal 1/3 of clavicle, upper and lower diameters of proximal 1/3 of clavicle, angle between proximal end of clavicle and presternum in coronal plane, and angle of thoracoclavicular joint at anatomic position forward. According to the anatomical parameters and biomechanical properties of the specimens, the anatomical locking plate was designed and developed. The sternoclavicular ligament and joint capsule of all the specimens were completely cut off to make the sternoclavicular joint dislocation model. The left and right sternoclavicular joint of each specimen were randomly divided into experimental group (anatomic locking plate fixation) and control group (oblique T shape locking plate fixation). The sternoclavicular joint activity and common force mechanism was simulated on the universal mechanical testing machine, and the clavicular distal load test, sternoclavicular joint torsion test, and anti-pulling of steel plate manubrium part test were performed. Results The differences between the anatomical parameters of gross measurement and CT measurement were not significant (P>0.05). In the clavicular distal load test, when the anatomical position perpendicular to the distal clavicle back loading to 20 N, the displacement of loading point in the experimental group was (8.455±0.981) mm, which was significantly less than that in control group [(10.163±1.379) mm] (t=–3.012,P=0.020); the distal clavicle displacement of loading point of experimental group and control group were (5.427±1.154) mm and (6.393±1.040) mm, respectively, showing no significant difference (t=–1.459, P=0.188). In the sternoclavicular joint torsion test, the torque of experimental group was significantly greater than that of control group when the clockwise torsion angle was at 2, 4, 6, 8, and 10 degrees and the counterclockwise torsion angle was at 4, 6, 8, and 10 degrees (P<0.05). The torsional stiffness in the experimental group under clockwise and counterclockwise condition was 0.122 and 0.108 N·m/° respectively, which were significantly higher than those in the control group (0.083 and 0.078 N·m/° respectively) (F=67.824, P=0.000; F=20.992, P=0.002). In the anti-pulling of steel plate manubrium part test, the maximum pullout force of experimental group [(225.24±16.02) N] was significantly higher than that in control group [(174.40±21.90) N] (t=5.785, P=0.001). Conclusion The new type of anatomical locking plate can realize the sternoclavicular joint three-dimensional fixation, and has the advantages of reliable fixation, simple operation, less trauma, superior biomechanical properties, and earlier functional exercise. It may be an ideal internal fixation device in clinical treatment of sternoclavicular joint dislocation or peripheral fractures.