Outcome of osteosynthesis and tensor fascia lata muscle pedicle bone graft in neglected femoral neck fracture in adults

Introduction

The management of displaced femoral neck fracture in young adult is still remains an unresolved riddle. Both the Non-union (NU) and Avascular Necrosis (AVN) are such a complication which needs to be addressed simultaneously. Even though, after emergent anatomical reduction and fixation many a times it progresses to AVN.^[1] The incidence of AVN is 5.5 - 70% and that of non-union is 0 - 22% has been recorded in the literature.^[2], ^[3], ^[4], ^[5] Head preserving surgery is the need of the time in young adults. Neglected femoral fracture in young adult is also not common due to lack of awareness, bias to get conservative treatment, avoiding surgical treatment, anaesthetic unfitness, illiteracy, low socio economic status etc.

Among the head preserving surgeries, Muscle Pedicle Bone Graft (MPBG) described by Meyer’s and Bakshi’s procedure are very popular. Where Meyer’s procedure used Quadriceps Femoris MPBG^[6] and Bakshi’s used Tensor Fascia Lata (TFL) MPBG^[7] for AVN, we have fixed the neglected fracture neck of femur in young patients by CRIF method and then TFL MPBG was fixed at the sub capital region of head with the help of a screw, to increase the vascularity of the femoral head.

Materials and Methods

In this retrospective study we operated on 15 young (age >18-50 years) patients with neglected (>3 week old) traumatic fracture neck of femur (garden stageIII and IV) were included while Patients age <18 yrs, >50 yrs, < 3week oldfracture, garden stage I & II, non-traumatic, pathological fracture were excluded.

All were treated first by doing MRI, then surface traction and adductor tenotomy was done in all cases. Then by CRIF with 6.5 CCS femoral head was fixed. Then by modifying the Baksi’s procedure by transfixing TFL MPBG with the 3.5 cortical screw in a slot at the sub capital region of the neck of femur, using light bulb technique so as to prevent dislodgement of the graft.

Post-operatively all the patients were allowed to sit on the bed as soon as pain was tolerable and were kept in the derotation boot plaster for 3 weeks after that non weight bearing crutch walking was started between 3 to 6 weeks and then gradual partial to full weight bearing was started between 6 to 12 weeks post operatively. All the patients were evaluated radiographically and clinically using modified Harris hip score at 3 months, 6 months, 12 months and 2 years respectively.

Results

We operated on 18 patients of which 3 were lost to follow up and were excluded from the study. Of the remaining 15 patients, 11 were male and 4 were female. Average age of the patient was 27.8 years. 9 had fracture in right and 6 had fracture in left hip. Anatomically majority had trans cervical 9, basis cervical 4, and sub capital 2 fractures. 8 had Garden stage III and 7 had Garden stage IV neck fracture ([Table 1]). In majority mode of injury was RTA in 10, followed by fall from height in 5. Associated injury of pelvic rami was in 3 and calcaneal fracture was in 2 patients.

The mean operative time of surgery was 2 hours 35 minute. Lateral cutaneous nerve of thigh was injured in 4 patients (3 transient and one permanent). In 3 wound healing took a longer duration due to superficial infection, which responded to broad spectrum I.V antibiotics. Shortening of 1.5 to 2 cm (average 1.75 cm) was noted in 9 (60%) of the patients postoperatively. Mean delay in surgery was 4.7 weeks (3-6 weeks). Some amount of terminal flexion and abduction was restricted in most of the cases. Delayed union was noted in 7 cases. No cases of non-union and AVN were noted. Mild Varus collapse was found in 4 cases ([Table 2]).

Clinically and radiographically the union and AVN was assessed up to 2 years post operatively (Fig 2A to 4D). The modified Harris Hip score was evaluated at each stage of follow up (i.e. 3 months, 6 months, 12 months and 2 years) and was found to be improving in subsequent follow up. The modified Harris hip score ^[10] at the final follow up was excellent in 8 hips, good in 4 hips, fair in 2 hips and poor in one hip ([Table 3]). The patient with fair score are doing well with the help of walking stick and do not want any further intervention. The patient with poor score was suggested THR but patient is reluctant due to economic constraints.

Discussion

Undoubtedly head preserving surgeries in neglected displaced neck femur fracture in young adults is the need of the time, especially in those part of the world where late presentation is not uncommon. The non-union and AVN can only be best addressed with the anatomic reduction, rigid fixation and revascularization surgeries in the form of muscle pedicle bone graft. Though there are various methods of reduction and rigid fixation, open reduction and internal fixation has been associated with more incidences of AVN.^[2], ^[3], ^[4], ^[5] Closed reduction internal fixation with 6.5 mm CCS in 2 or 3 number provides the best union rate as in our study.

There are various methods to increase the vascularity of the femoral head using MPBG. More popular being Meyer’s Quadratus Femoris and Baksi’s Tensor Fascia Lata MPBG. Some have even tried with the Iliopsoas^[11] and Sartorius^[12] MPBG. There are similar studies where by Gupta etal.,^[13] in 2008 showed similar results with open reduction internal fixation with Meyer’s technique and showed similar rate of union and AVN. In another study Chaudhary 2008 ^[14] by closed reduction and internal fixation and Meyer’s technique showed good union rate of and no AVN, similar to our study ([Table 4]).

It has been shown in the literature that the fate of AVN is set at the time of injury and urgent or delay in fixation has nothing to do with its progress to AVN.^[15] To prevent further AVN we did closed reduction and internal fixation and only anterior capsulotomy was done to fix the TFL MPBG with a screw, to prevent graft dislodgement. Maurer et al., in a cadaveric study showed that 2 screws may be an acceptable fixation.^[16] In our study union rate was significantly higher and there were no cases of AVN in any patients. Sud et al. reported 22% of non-union and 10% of AVN by closed reduction and internal fixation with CCS. Asif et al., have shown that long term result of bipolar is also not very satisfactory. Juha Partanen et al., concluded in their study that functional outcome of osteosynthesis is better but reoperation rate was higher compared to the hemiarthroplasty group.^[17]

Conclusion

We conclude that this method of treating neglected displaced fracture neck of femur in young adults using closed reduction internal fixation with 6.5 CCS and TFL MPBG fixed with a screw is a simple effective, economic and reproducible method. Though, THA can be easily carried out in failed cases. The sample size being very small in our study, the similar study on larger group is required to reach to a definitive conclusion.

Ethical Approval

This study was conducted aftr taking approval from the institute Ethical approval committee with ref. no. MGM/IEC-102/2023.

Conflict of Interest

None.

Source of Funding

None.