Safety and efficacy of a two-screw cephalomedullary nail for intertrochanteric femur fracture fixation: a retrospective case series in 264 patients

Technical Trick: Traction Table-Assisted Lateral Decubitus Patient Positioning in Cephalomedullary Nailing of Geriatric Intertrochanteric Femur Fractures

SUMMARY

Cephalomedullary nail fixation of geriatric intertrochanteric femur fractures is, and will continue to be, performed by most orthopaedic surgeons. The influence of technical factors on outcome is clear, and it is imperative that orthopaedic surgeons use contemporary strategies to achieve adequate reduction and fixation. The lateral patient position on a traction table potentially confers several advantages which surgeons can use to achieve quality outcomes even in patients who have challenging body morphology and/or fracture anatomy. A preferred surgical technique for lateral positioning is presented here and a case series comparing supine versus lateral nailing procedures. Lateral positioning was used more frequently in obese patients and by trauma-trained surgeons, and the results equal or exceed those in supine cases with respect to reduction and placement of fixation. Training surgeons in lateral nailing can deliver a reproducible strategy for reduction and fixation in straightforward and complex cases. By mastering the setup and technique on more simple cases, surgeons can be better prepared for the more complex where advantages of lateral nailing are even more apparent.

What is the most fixable intramedullary implant for basicervical fracture and transcervical shear fracture? - A finite element study

Objective

The objectives of this study are 1) to biomechanically compare six different intramedullary fixations for basicervical fracture (AO 31-B3, Type 2 in area classification) and transcervical shear fracture (AO 31-B2.3, Type 1-2 in area classification) using the finite element (FE) method, and 2) to investigate the effects of two different unstable fracture types on fixation.

Methods

FE models of two different types of proximal femoral fractures are constructed from CT scan images of a patient with osteoporosis. The fracture models are fixed with a short femoral nail with a single lag screw, short femoral nail with a single blade, and short femoral nail with double lag screws, and then fixed with long femoral nails for each of the three nail types. Subsequently, the maximum loads during walking and stair climbing, as well as the minimum principal strain and compressive failure elements are calculated to assess the fixation of each implant.

Results

In both fracture types, the long nail with double lag screws show the smallest volume of compressive failure elements (basicervical fracture, 2 mm3; transcervical shear fracture, 217 mm3). In all types of implants, the volume of the compressive failure elements is larger in the transcervical shear fracture than in the basicervical fracture. A similar trend is observed for the minimum principal strain (compressive strain).

Conclusion

The present study shows that a long nail with double lag screws is the most fixative intramedullary nail device for basicervical fracture and transcervical shear fracture in any condition. Furthermore, it is shown that transcervical shear fracture is considerably more unstable than basicervical fracture.

Does Size Matter for Cephalomedullary Nails in Geriatric Intertrochanteric Fractures?

OBJECTIVES

To evaluate the need for reoperation of geriatric intertrochanteric hip fractures treated with 10-mm cephalomedullary nails versus those treated with nails larger than 10 mm.

DESIGN

Retrospective review at a single institution.

SETTING

Level I trauma center.

PATIENTS/PARTICIPANTS

All patients age 60 and over treated with cephalomedullary fixation for an intertrochanteric femur fracture at a single institution.

INTERVENTION

Cephalomedullary fixation with variable nail diameters.

MAIN OUTCOME MEASUREMENTS

Reoperation rates of geriatric intertrochanteric fractures treated with a size 10-mm diameter cephalomedullary nail compared with patients treated with nails larger than 10 mm.

RESULTS

There were no significant differences in reoperation rates when the 10-mm cohort was compared with an aggregate cohort of all nails larger than 10 mm (P = 0.99). This result was true for both all-cause reoperation and noninfectious reoperation. There was no difference between cohorts in regards to age, gender, or fracture pattern.

CONCLUSIONS

A 10-mm cephalomedullary nail can be used in lieu of a larger diameter fixation in patients age 60 and older with intertrochanteric femur fractures while still maintaining a comparable rate of reoperation.

LEVEL OF EVIDENCE

Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.

Reverse Z-effect phenomenon in a basicervical femoral fracture using cephalomedullary nail with two superior antirotation screws: A case report and procedure evaluation

We present a case of reverse Z-effect phenomenon in a basicervical femoral fracture using a cephalomedullary nail together with two superior antirotation screws and evaluate the procedure. An 86-year-old woman fell in her home and could not stand due to right hip joint pain. X-ray and CT imaging showed a right basicervical femoral fracture (AO/OTA classification; 31B3), and open reduction and internal fixation (OR/IF) was performed with a cephalomedullary nail and two superior antirotation screws (TES Nail, HOMS, Tokyo, Japan). Two months later, X-ray showed penetration of the femoral head by the inferior lag screw with lateral migration of the two superior antirotation screws; the so-called "reverse Z-effect"; without any trauma. We performed the exchange of a shorter inferior lag screw for the longer one, and replaced the sliding type end cap with one of rocking type. The reverse Z-effect has been reported in cases with two lag screws, i.e. one inferior and one superior, in the past; however, to our knowledge, there has been no case reported in the literature using two superior antirotation screws together with one inferior lag screw.