Femoral Neck Fractures
Conditions
Keywords
femoral neck fracture, internal fixation, FNS and MCS, multicenter randomized controlled clinical trial, internal fixation failure rate
Brief summary
This prospective multicenter cohort study is to compare the post-operative implant failure rate between the patients with femoral neck fracture (AO classification 31-B) using Femoral Neck System (FNS) versus Multiple Cancellous Screws (MCS) at 2-year follow up. The patients are divided into the FNS group and the MCS group according to the internal fixation they choose. The internal fixation failure rate (IFFR) and differences in fracture prognosis of the two groups will be compared. Obtain clinical data of FNS in the Chinese population, and verify the safety and efficacy of FNS for patients with femoral neck fracture.
Detailed description
This is a prospective multicenter cohort study. The team leader is Peking University Third Hospital. All patients are divided into 2 groups according to the internal fixation they choose. Investigators use FNS for internal fixation in Group 1 and MCS in Group 2. Since FNS is clinically comparable to the Dynamic Hip Screw (DHS) system, investigators used DHS clinical data as a statistical reference. The relevant parameters of the sample calculation are α = 0.05 (one-sided) and β = 0.2. PASS 15 was used for calculation, and the final sample size was 290. The FNS group and the MCS group each included 145 patients. See the text for detailed inclusion and exclusion criteria. Patients that meet all the inclusion criteria but do not meet any exclusion criteria, and who have signed the informed consent will be recruited, and each patient will be assigned a unique patient identification number, which will be used throughout the study identify the patient. Investigators will perform preoperative preparation, intraoperative operation and internal fixation implantation according to the instructions provided in the product packaging. Investigators only plan to include cases that can successfully conduct closed reduction, therefore investigators will exclude cases that require open reduction. For the MCS group, three cancellous screws with an inverted triangle pattern are used to fix the fracture of femoral neck. After the operation, the patients will be managed according to the standard nursing and rehabilitation procedures of the experimental site and the results of laboratory tests will be recorded. Regular follow-up evaluation will be performed after the operation until the end of the two-year follow-up or the primary end point of the study. In this study, the internal fixation failure rate (IFFR) is used as the primary end point of the study, which is defined as the total incidence of internal plant cut-out and fracture. The results of the radiographic examination, the lateral X-ray film and computed tomography(CT), will be evaluated by an independent radiologist to determine whether there are cut-out or fracture of the internal plant. Secondary endpoints include: 1. Bone nonunion after 36 weeks: evaluate bone healing according to the lateral X-ray examination. According to the regulations of Food and Drug Administration of the US, it is defined as nonunion if there are no obvious signs of fracture healing 9 months after the fracture, or if there is no obvious difference in fracture space after three consecutive months. 2. Garden classification proportion, and Garden index for reduction assessment. 3. Clinical prognosis: o A 12-Item Short-Form Health Survey (SF-12) o Harris hip score. 4. Operation time, from the incision to internal fixation implanted. 5. The times of intraoperative fluoroscopy, average 25 milliseconds per X-ray shot, record the number of X-ray shot. 6. Postoperative adverse events within 2 years, including ipsilateral femoral head avascular necrosis, infection, wound hematoma, ipsilateral coxa vara, and ipsilateral limb shortening. In this study, it is difficult to blind anyone . Investigators will try their best to reduce human-induced bias in experimental results. Investigators will use one-sided α = 0.05 for statistical tests and confidence interval calculations. P value \<0.05 is considered statistically significant. SPSS (latest version: SPSS Inc., Chicago, IL, USA) will be used to analyze the results.
Interventions
Sponsors
Peking University Third Hospital
Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University
Tianjin Hospital
West China Hospital
Hospital of Chinese Medicine of the Xinjiang Uygur Autonomous Region
Xi'an Honghui Hospital
The Fuzhou No 2 Hospital
Study design
Allocation
NON_RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Intervention model description
This prospective multicenter cohort study is to compare the post-operative implant failure rate between the patients with femoral neck fracture (AO classification 31-B) using Femoral Neck System (FNS) versus Multiple Cancellous Screws (MCS) at 2-year follow up.The patients are divided into the FNS group and the MCS group according to the internal fixation they choose.
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
1. Age ≥18 years 2. Patients with unilateral femoral neck fractures that will be treated with internal fixation 3. According to AO fracture classification, subjects with the fracture type (31-B) 4. Subjects (with the help of relatives) can understand the informed documents and patient questionnaires. 5. Subjects (with the help of relatives) voluntarily provide written informed consent to participate in the clinical study and authorize the transfer of their information to the sponsor. 6. The investigator believes that the subject can understand the clinical study, is willing and able to complete all research procedures and follow-up visits and can cooperate with the research procedures. 7. In-label use of the MCS and FNS.
Exclusion criteria
1. Subject does not provide voluntary consent to participate in the study. 2. The researcher believes that the subjects have conditions that affect the participation and follow-up of this study. (for example, the patient lives in a remote area or has difficulty in going back to the hospital for follow-up or does not cooperate with the medical guidance and suggestions of the surgeon.) 3. The subjects were pregnant or lactating women. 4. The researchers believe that the subjects have psychological disorders, which may affect the treatment outcome. 5. Garden classification III and IV of femoral neck fracture patients older than 65 years 6. Concurrent hip osteoarthritis. 7. Fractures where the operative treatment will occur more than three weeks after the primary injury 8. Patients combined with other bone fractures. 9. Pathological fracture (e.g., primary or metastatic tumor) 10. Serious soft tissue injury, judged by the investigator, will impact the union of the fracture, combined open fractures, vascular injury, and combined osteofascial compartment syndrome 11. Multiple systemic injuries judged by researchers not suitable for enrollment. 12. Revision surgeries (for example, due to malunion, nonunion or infection) 13. Concurrent medical conditions judged by researchers not suitable for enrollment, such as: metabolic bone disease, post-polio syndrome, poor bone quality, prior history of poor fracture healing, etc 14. Patients with anaesthetic and surgical contraindications 15. Patients known to be allergic to implant components 16. Patients who are currently using chemotherapeutics or accepting radiotherapy, use systematically corticosteroid hormone or growth factor, or long-term use sedative hypnotics (continuous use over 3 months) or non-steroidal anti-inflammatory drugs (continuous use over 3 months) 17. Intemperance judged by researchers not suitable for enrollment (e.g., excessive daily drinking or smoking, drug abuse); 18. Subjects participated in other clinical studies in the past 3 months, which may affect the outcome and follow-up according to the judgment of researchers. 19. Subjects have significant neurological or musculoskeletal disorders or may have adverse effects on gait or weight-bearing (e.g., muscular dystrophy, multiple sclerosis, cerebral infarction, hemiplegia, Charcot arthropathy, avascular necrosis of the femoral head).
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Internal Fixation Failure Rate | from operation to 1-year follow-up after the surgery | defined as the total incidence of internal plant cut-out and fracture. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Number of Participants With Bone Nonunion | from operation to 1-year follow-up after the surgery | evaluate bone healing according to the lateral X-ray examination. According to the regulations of Food and Drug Administration of the US, if there are no obvious signs of fracture healing 9 months after the fracture, or if there is no obvious difference in fracture space after three consecutive months, it is defined as nonunion. |
| Harris Hip Score | At 1 year after the surgery | the scale of the score value is from 0 to 100, and a higher score means a better outcome |
| Operation Time | intraoperative | from the incision to internal fixation implanted. |
| The Times of Intraoperative Fluoroscopy | intraoperative | average 25 milliseconds per X-ray shot, record the number of X-ray shot |
| Number of Participants With Postoperative Adverse Events | from operation to 1-year follow-up after the surgery | including ipsilateral femoral head avascular necrosis, infection, wound hematoma, ipsilateral coxa vara, and ipsilateral limb shortening |
| Reduction Quality | from operation to 1-year follow-up after the surgery | Routine radiographs were taken to assess fracture reduction quality, which was categorized neutral, positive or negative support. Neutral Support: the medial cortex of the head-neck fragment is continuous with the medial cortex of the femoral shaft. Positive support: the medial cortex of the head-neck fragment lies medial to the medial cortex of the femoral shaft. Negative support: the medial cortex of the head-neck fragment lies lateral to the medial cortex of the femoral shaft. |
| Femoral Neck Shortening | from operation to 1-year follow-up after the surgery | Since both implants are designed to allow for femoral neck shortening to allow fragment contact and bone healing. The amount of shortening primarily depends on the fracture configuration and bone quality. |
Countries
China
Contacts
STUDY_DIRECTORFang Zhou, MD
Peking University Third Hospital
Participant flow
Recruitment details
A total of 358 patients with femoral neck fractures at seven hospitals were initially recruited and screened for eligibility to participate in the study from October 2021 to November 2023. Of these patients, 68 patients were excluded from this study. Ultimately, 290 patients were enrolled for the study.
Pre-assignment details
This is a prospective cohort study. All patients were independently choosing to join in one of the 2 groups. We used FNS for internal fixation in FNS group, while we did the internal fixation with MCS in MCS group. Enrollment stoped after either group reaches 145 cases, and the enrollment completed after both groups reach 145 cases.
Baseline characteristics
| Characteristic | — |
|---|---|
| Age, Continuous | 53.71 years STANDARD_DEVIATION 11.41 |
| Garden classification I-II | 61 Participants |
| Garden classification III-IV | 77 Participants |
| Race (NIH/OMB) American Indian or Alaska Native | 0 Participants |
| Race (NIH/OMB) Asian | 277 Participants |
| Race (NIH/OMB) Black or African American | 0 Participants |
| Race (NIH/OMB) More than one race | 0 Participants |
| Race (NIH/OMB) Native Hawaiian or Other Pacific Islander | 0 Participants |
| Race (NIH/OMB) Unknown or Not Reported | 0 Participants |
| Race (NIH/OMB) White | 0 Participants |
| Sex: Female, Male Female | 72 Participants |
| Sex: Female, Male Male | 140 Participants |
Adverse events
| Event type | EG000 affected / at risk | EG001 affected / at risk |
|---|---|---|
| deaths Total, all-cause mortality | 1 / 139 | 0 / 138 |
| other Total, other adverse events | 0 / 139 | 0 / 138 |
| serious Total, serious adverse events | 8 / 139 | 12 / 138 |
Outcome results
None listed