Combination of modified free vascularized fibular grafting and reverse Less Invasive Stabilization System (LISS) for the management of femoral neck nonunion in patients thirty years of age or younger

A quantitative study of bone defects in displaced femoral neck fractures based on virtual reduction techniques

BACKGROUND

Bone defects in femoral neck fractures are strongly associated with the prognosis after internal fixation. However, qualitative analysis of bone defects in femoral neck fractures has already been performed, quantitative studies have not been reported. In this study, we aimed to systematically analyse the morphological characteristics of bone defects in patients with femoral neck fractures using computed tomography (CT) images combined with computer image analysis techniques.

METHODS

Four hundred and sixty-nine patients with femoral neck fractures from January 2014 to December 2018 at two grade A tertiary hospitals were included. Models were created in Mimics software based on CT images collected within 1 week after injury and then imported into 3-matic software for virtual reduction. The volume of the bone defect (VBD), maximum defect thickness (MDT), extent of the bone defect region (EBDR) , main defect quadrant (MDQ), collapse type and fracture classification were calculated and recorded.

RESULTS

The EBDR, collapse type and MDT all had a significant positive effect on the VBD (P <0.05), with a more significant effect at higher quantiles. Age also had a significant positive effect on the VBD (P < 0.05), but its effect was more pronounced at lower quantiles. Compared to non-subcapital fractures, subcapital fractures had a positive effect on the VBD only at the 50 and 75% quantiles (P < 0.01). The female sex had a significant negative effect on the VBD compared to the male sex (P < 0.05).

CONCLUSION

This study established a reliable computer image processing method for quantitative analysis of the VBD in femoral neck fractures and revealed that all patients with femoral neck fractures had bone defects, which can occur at any part of the femoral neck. The EBDR, MDT, collapse type, and patient age and sex were all important risk factors for the extent of the defect and should be taken into account in surgical planning.

Functional outcomes and perceived quality of life following fixation of femoral neck fractures in adults from 18 to 69 years using dynamic hip screw (DHS) and an additional anti-rotation screw- a retrospective analysis of 53 patients after a mean follow-up time of 4 years

INTRODUCTION

The purpose of the study was to explore the functional outcome after osteosynthesis with dynamic hip screw (DHS) for adults up to 69 years, and identify potential predictive indicators of either positive impact on quality of life or increase the incidence of complications.

MATERIALS AND METHODS

Out of 85 patients 53 could be contacted, 36 were followed up clinically and radiologically, 17 patients could be interviewed by phone. All fractures have been treated by osteosynthesis with DHS and one additional anti-rotation screw. Functional outcome and quality of life were measured with use of Harris Hip Score (HHS) and Short Form 12 Health Survey (SF 12). The mean values were compared to two random sample t tests and ANOVA for independent random samples. The connection between an aim variable and selected variables of influence was examined by regression analysis.

RESULTS

The mean HHS showed good functional results with 88 points (median 95.6). Good or excellent results were achieved in 80.4% of cases. The current investigation also delivers promising results with regard to the complication rate: avascular femoral head necrosis (AVN) in 11.3% of cases (n = 6), 9.4% showed non-union (n = 5) and cut out (n = 3) occurred in 5.7%. A secondary conversion to hip arthroplasty (n = 7) had a strong negative impact on everyday life (HHS = 63.3 points, Physical Health Summary Score SF-12 = 34.9 points).

CONCLUSIONS

The results of this study are promising showing uncomplicated fracture healing in 84.9% of intracapsular femoral neck fractures and a low incidence of complications after osteosynthesis with DHS in patients aged up to 69 years. The quality of the fracture reduction achieved in the axial view and a small tip apex index after an osteosynthetically treated femoral neck fracture with DHS are significant predictive indicators for complications. Diabetes, age > 65 years, osteoporosis, ASA III may also be significant factors for worse results, but showed no statistical significance in our analysis.

Results of quadratus femoris muscle pedicle bone grafting (Meyers' procedure) in the management of ununited femoral neck fractures

PURPOSE

Femoral neck fractures in young patients are associated with increase complication risk. The objective of this study was to evaluate the results of quadratus femoris muscle pedicle grafting in the treatment of ununited femoral neck fractures.

METHODS

This study includes 16 patients with ununited femoral neck fractures treated with quadratus femoris muscle pedicle graft. 7 patients had neglected femoral neck fractures while 9 had ununited femoral neck fractures after fixation. Quadratus femoris muscle with 2 × 1 × 1 cm (length-width-height) bone in its insertion was elevated and placed in the posterior cortex of the femoral neck with additional cancellous graft from the posterior iliac bone. The graft was fixed with 3.5-mm cortical screws.

RESULTS

The average follow-up period was 96 weeks and the radiological union occurred at an average of 7 months. The femoral inclination of all patients was 128.5° ± 3.9° with an average 7 (range 0-35) mm thigh atrophy in the last follow-up visit. Only 1 patient (6%) had avascular necrosis of the femoral head and was treated with hip arthroplasty.

CONCLUSIONS

Quadratus femoris muscle pedicle grafting provides better stability and blood supply in ununited femoral neck fractures. Achieving fracture union provides better clinical and functional results in the treatment of femoral neck fractures.

Bone marrow lesion on magnetic resonance imaging indicates the last chance for hip osteonecrosis treated with vascularized fibular grafting before collapse

PURPOSE

Timing of surgery is the most critical prognostic factor for hip osteonecrosis treated with free vascularized fibular grafting (FVFG). Bone marrow lesion (BML) on MRI usually occurs immediately before femoral head collapse. We conducted a retrospective cohort study to evaluate whether the noncollapsed hips with BML can benefit from FVFG.

METHODS

Consecutive patients undergoing modified FVFG were identified from our clinical repository between January 2014 and December 2014. Based on whether BML was pre-operatively detected, the four year radiographic and clinical outcomes were compared.

RESULTS

In the BML cohort, 22 of 53 hips (42%) showed radiographic signs of osteonecrosis progression, which was significantly higher than that in the control cohort (8 of 49, 16%; P = 0.005). The BML hips showed a significantly lower pre-operative Harris Hip Score (HHS) than those without BML (77.8 vs. 85.5, P = 0.046), whereas no such difference was observed in the final HHS or its post-operative improvement (HHS 90 vs. 94, P = 0.397; HHS improvement 12 vs. 8, P = 0.067). In the subgroup of patients with a pre-operative HHS lower than 80, BML hips were associated with a slightly lower final HHS than hips without BML. Four of 5 (80%) failed hips with BML had a poor pre-operative hip function.

CONCLUSION

BML indicates the last chance for a reproducible improvement in the treatment of hip osteonecrosis with FVFG before collapse. However, the concomitant lower pre-operative HHS (< 80) is a poor prognostic factor for BML-positive hips.

Vascularized Fibular Grafting in Treatment of Femoral Neck Nonunion: A Prognostic Study Based on Long-Term Outcomes

BACKGROUND

The purpose of this study was to evaluate the long-term efficacy and prognostic factors predicting success of revision surgery with free vascularized fibular grafting (FVFG) for treatment of femoral neck nonunion.

METHODS

We prospectively enrolled patients who underwent revision surgery with FVFG between January 2001 and January 2013 in a tertiary hospital in China. A total of 98 patients with a minimum 5-year follow-up were included for analysis. The criteria for FVFG failure were conversion to hip arthroplasty, recommendation for a hip arthroplasty, or a Harris hip score of <80 points. Demographic information, the preoperative neck shortening ratio (NSR), the fixation method, and postoperative radiographic parameters including the postoperative NSR and neck-shaft angle (NSA) were recorded for prognostic analysis.

RESULTS

At an average of 9.8 ± 3.5 years (range, 3 to 17 years) postoperatively, the overall success rate of this surgical procedure was 77% (75 of 98). The success and failure groups had no significant differences in age, fixation method, interval between initial fixation and revision surgery, or postoperative NSA. The success group had a significantly higher NSR than the failure group both preoperatively (77.8% versus 62.4%, p < 0.001) and postoperatively (87.6% versus 78.4%, p = 0.001). The receiver operating characteristic (ROC) curve analysis revealed an optimal cutoff for preoperative NSR of 60% to predict the outcome. Patients with a preoperative NSR of >60% had a success rate of 91% (68 of 75).

CONCLUSIONS

Revision surgery with FVFG and internal fixation is an effective and important option for treating nonunion of the femoral neck in young patients without severe preoperative shortening and neck resorption (preoperative NSR of >60%).

LEVEL OF EVIDENCE

Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.

Reverse Less Invasive Stabilization System (LISS) Plating for Proximal Femur Fractures in Poliomyelitis Survivors: A Report of Two Cases

Case series

Patient: Female, 50 • Male, 60

Final Diagnosis: Proximal femur fractures

Symptoms: Hip pain

Medication: —

Clinical Procedure: Internal fixation surgery

Specialty: Orthopedics and Traumatology