ObjectiveTo investigate the morphology of coronal femoral intertrochanteric fracture and its effect on reduction and internal fixation.MethodsThe clinical and imaging data of 46 patients with femoral intertrochanteric fracture who met the selection criteria between August 2017 and October 2018 were reviewed. There were 15 males and 31 females; the age ranged from 62 to 91 years, with an average of 72.8 years. The causes of injury included walking falls in 35 cases, falling out of bed in 4 cases, and traffic accidents in 7 cases. The AO/Orthopaedic Trauma Association classification was type 31-A1 in 11 cases and type 31-A2 in 35 cases. All patients underwent closed reduction and internal fixation with intramedullary nails. During the operation, fracture reduction and fixation were performed according to the preoperative evaluation results. According to the patients’ preoperative X-ray film and CT three-dimensional reconstruction images, the direction of the coronal fracture line of the femoral intertrochanter and the morphological characteristics of the fracture block were observed; and the coronal fracture discrimination analysis was carried out for the fractures of different AO/OTA types. The percentages of coronal femoral intertrochanteric fractures diagnosed by preoperative X-ray film and CT three-dimensional reconstruction were calculated and statistically analyzed. The fracture reduction, the position of internal fixation [measurement of tip-apex distance (TAD)]. and the reliability of internal fixation were observed after operation.ResultsX-ray film was not easy to identify coronary fracture, and the coronal fracture line and the shape of the fracture piece weree clearly visible in CT three-dimensional reconstruction images. The morphological characteristics of the coronary fracture block: in AO/OTA 31-A1 type, the fracture line extended obliquely backward from the anterior tip of the large rotor, above the small rotor with or without small rotor fracture; in AO/OTA 31-A2 type, fracture line extended obliquely backward from the anterior tip of the large rotor to below the small rotor. Thirteen cases (28.3%) of coronal fractures were found on preoperative X-ray films, and 35 cases (76.1%) were found by CT three-dimensional reconstruction, showing significant difference (χ2=21.083, P=0.000). In AO/OTA 31-A1 type patients, the proportion of coronal fractures found by X-ray film and CT three-dimensional reconstruction was 18.2% (2/11) and 54.5% (6/11), respectively, and that in AO/OTA 31-A2 type patients was 31.4% (11/35) and 82.9% (29/35), respectively, showing significant differences (χ2=3.143, P=0.000; χ2=20.902, P=0.000). Among the 35 patients with coronal fractures, 6 cases (17.1%) of AO/OTA 31-A1 type, 29 cases (82.9%) of AO/OTA 31-A2 type. The operation time of the patient was 80-112 minutes, with an average of 95 minutes; the intraoperative blood loss was 180-450 mL, with an average of 360 mL. There was no complication such as infection, falling pneumonia, and deep vein thrombosis of the lower extremities. At 3 days after operation, the internal fixators were all in the proper position. The TAD was 0.9-1.8 cm, with an average of 1.4 cm. All patients were followed up 14-18 months, with an average of 16 months. All the fractures healed osseously, and there was no complication such as nonunion and loosening of internal fixation.ConclusionCT three-dimensional reconstruction can better identify coronal femoral intertrochanteric fractures than X-ray films, and accurately recognize and analyze the incidence and morphological characteristics of coronal fractures, which can help formulate more effective surgical strategies to promote patient recovery.
Objective To introduce a novel comprehensive classification for femoral intertrochanteric fractures, and to accommodate the clinical requirement for the world-wide outbreak of geriatric hip fractures and surgical operations. Methods On the basis of reviewing the history of classification of femoral intertrochanteric fractures and analyzing the advantages and disadvantages of AO/Orthopaedic Trauma Association (AO/OTA) classification in different periods, combined with the current situation of extensive preoperative CT scan and three-dimensional reconstruction and widespread use of intramedullary nail fixation in China, the “Elderly Hip Fracture” Research Group of the Reparative and Reconstructive Surgery Committee of the Chinese Rehabilitation Medical Association proposed a novel comprehensive classification for femoral intertrochanteric fractures, focusing on the structure of fracture stability reconstruction during internal fixation. Results The novel comprehensive classification of femoral intertrochanteric fractures incorporates multiple indicators of fracture classification, including the orientation of the fracture line, the degree of fracture fragmentation, the lesser trochanteric bone fragment and its distal extension length (>2 cm), the posterior coronal bone fragment and its anterior extension width (involving the lateral cortex of the head and neck implant entry point), transverse fracture of the lateral and anterior wall and its relationship with the implant entry point in the head and neck, and whether the cortex of the anteromedial inferior corner can be directly reduced to contact, etc. The femoral intertrochanteric fractures are divided into 4 types (type A1 is simple two-part fractures, type A2 is characterized by lesser trochanter fragment and posterior coronal fractures, type A3 is reverse obliquity and transverse fractures, type A4 is medial comminution which lacks anteromedial cortex transmission of compression force), each of which is subdivided into 4 subtypes and further subdivide into finer subgroups. In a review of 550 trochanteric hip fracture cases by three-dimensional CT, type A1 accounted for 20.0%, type A2 for 62.5%, type A3 for 15.5%, and type A4 for 2.0%, respectively. For subtypes, A2.2 is with a “banana-like” posterior coronal fragment, A2.4 is with distal cortex extension >2 cm of the lesser trochanter and anterior cortical expansion of the posterior coronal fragment to the entry portal of head-neck implants, A3.4 is a primary pantrochanteric fracture, and A4.4 is a concomitant ipsilateral segmental fracture of the neck and trochanter region. ConclusionThe novel comprehensive classification of femoral intertrochanteric fractures can describe the morphological characteristics of fractures in more detail, include more rare and complex types, provide more personalized subtype selection, and adapt to the clinical needs of both fractures and surgeries.
ObjectiveTo summarize the research progress of posterior coronal banana-shaped fragments in the treatment of intertrochanteric femoral fracture with cephalomedullary nail, provide valuable reference for clinical practice. Methods Relevant domestic and foreign literature was extensively reviewed to summarize the history, anatomical structure, the need for reduction and fixation, the influence on the stability of cephalomedullary nail, and the remedies of posterior coronal banana-shaped fragments. Results With the wide application of three-dimensional-CT in clinical practice, the posterior coronal fragments were more comprehensively understood, and the banana-shaped fragments accounted for about 20% in A2 type pertrochanteric femur fractures. According to whether the fracture line involves the entry portal of head-neck implants or not, the coronal fragments were divided into two types: small and large. The large fragment involving the posteromedial wall (lesser trochanter) will increase the difficulty of the medial cortical contact reduction; or involving the posterolateral wall and resulting in rupture of the entry portal (type A2.4), which will cause sagittal swing of the nail in the femoral marrow cavity, thereby affecting the stability of the nail. There is no effective technique for reduction and fixation of the banana-shaped fragment nowadays. However, the adverse effects of posterior banana-shaped fragment can be compensated by improving the quality of fracture reduction and choosing high filling cephalomedullary nail. ConclusionThe extension of the posterior coronal fracture line on the lateral wall may affect the entry portal of head-neck implants, which will impair the bone-nail integral stability in the sagittal plane. Whether the entry portal will rupture or not and its risk factors still need further clinical and basic research.