Randomized Comparison of 2 Fixation Techniques for Unstable Intertrochanteric Hip Fractures

Hip Fractures Clinical Trial

— EMvsIM  

Official title:

Extramedullary vs. Intramedullary Devices in the Treatment of Unstable Intertrochanteric Hip Fractures

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00597779
• Other study ID #: GEN #07-065
• Status: Completed
• Phase: Phase 3
• First received: January 9, 2008
• Last updated: August 14, 2014
• Start date: February 2007
• Est. completion date: November 2012

Study information

• Verified date: August 2014
• Source: McGill University Health Center
• Contact: n/a
• Is FDA regulated: No
• Health authority: Canada: Ethics Review Committee
• Study type: Interventional

Clinical Trial Summary

The purpose of this study is to compare the clinical and radiological outcome of patients that are treated with two different orthopedic implants. The study population will consist of patients that have sustained unstable hip fractures. The two different implants will be randomly assigned.

The null hypothesis states that there should not be any significant differences between the two implants.

Description:

Intertrochanteric hip fractures are common injuries in the elderly population. They often signify generalized physical deterioration. Operative management has become the standard of care to prevent life threatening complications and dates back to the 1940's. The design of implants has evolved significantly since then.

The sliding hip screw replaced static fixation of the femoral head in the 1950's. As a result of this improvement in design, failures have been reduced to 9-16%. The sliding hip screw allows for stable collapse of the femoral neck. This can lead to significant shortening of the proximal femur in comminuted fractures.

Current treatment modalities focus on obtaining a satisfactory union of the fracture, often at the expense of anatomical alignment. Severely comminuted fractures treated with a standard plate-hip-screw device thus commonly result in significant degrees of mal-union and shortening. In the past, implants designed to restore and maintain the anatomy of the hip have resulted in high failure rates with the implant breaking out of the femoral head. In the mid 1980's, recognition of this led to the development of various intramedullary devices for fixation of these fractures. The weight-bearing portion of the implant is therefore shifted medially, resulting in reduced lever forces on the implant and femur. Additionally, the IM device does not rely on fixation to the lateral cortex of the femur with screws. From a biomechanical standpoint, the intramedullary device has distinct advantages, as it is a load- sharing device more closely located to the axis of weight bearing than the plate-hip-screw device.

Advances in intramedullary designs have been promising, but the clinical results variable. The relatively high rate of fracture at the tip, specifically at the level of the locking bolts, has hampered the widespread popularity of intramedullary devices. Additionally, the large diameter of the proximal aspect of the implants required extensive reaming of the greater trochanter and partial detachment of the gluteus medius. This may lead to abductor weakness and a Trendelenburg gait. Some studies have found increased re-operation rates for these early hip-nail devices compared to the plate -hip-screw implant. Other studies have shown decreased blood loss and operative time with the nails. A meta-analysis of the literature favors the sliding hip screw design. Unfortunately, most studies focus on radiological failure rate rather than patient function and relate to the first generation of IM devices.

The newest generation of nails (like the IM studied here) has attempted to correct the shortcomings of earlier designs. The proximal aspect of the nail diameter is minimized. The distal locking screw is located far away from the distal end of the nail and the locking bolt is placed in an oblique fashion. Design alterations to the femoral head fixation portion of the nail by using a helical blade rather than a screw may improve fixation in the femoral head. These new designs seem to compare favorably in recent clinical tests. Early mobilization for patients with the intramedullary device (IM) seems to be better.

Results of the pilot study indicate an earlier return to full mobility and shorter operating time in the IM group. This study included all intertrochanteric fracture types and did not demonstrate a clear benefit of the IM in many other parameters. The currently proposed multi-centre study will focus on the unstable A2 intertrochanteric fracture pattern.

Considering the significantly increased cost of the new intramedullary devices compared to the standard plate-hip-screw, a significant overall improvement in patient function should be realized before the general use of these new devices could be recommended.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 200
• Est. completion date: November 2012
• Est. primary completion date: November 2012
• Accepts healthy volunteers: No
• Gender: Both
• Age group: 55 Years and older

Eligibility

Inclusion Criteria:

1. 55 years or older

2. Type A2 Intertrochanteric fractures

3. Mono trauma

4. Medically fit for surgery

5. Less than 2 weeks post fracture

Exclusion Criteria:

1. Fractures due to malignancy

2. Non-ambulatory pre-fracture

3. Severe dementia

4. Limited life expectancy due to significant medical co-morbidities

5. Medical contraindication to surgery

6. Inability to comply with rehabilitation of form completion

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment

Related Conditions & MeSH terms

• Fractures, Bone
• Hip Fractures

Intervention

Device:
• Dynamic Hip Screw (DHS); Trochanteric Fixation Nail (TFN)
Surgical stabilization of unstable intertrochanteric hip fractures using two commonly used implant categories

Locations

Country	Name	City	State
Canada	McGill University Health Centre - Montreal General Hospital	Montreal	Quebec

Sponsors (2)

Lead Sponsor	Collaborator
Rudy Reindl	Orthopaedic Trauma Association

Country where clinical trial is conducted

Canada, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Timed 2 minute walking distance		6 weeks, 3 months, 6 months and 12 months	No
Primary	TUG (Time up and go) test		6 weeks, 3 months, 6 months and 12 months	No
Primary	Trendelenburg's test: pelvic drop		6 weeks, 3 months, 6 months and 12 months	No
Primary	Fracture classification: Mueller/ AO, displacement, time to union, heterotopic ossification and shortening.		6 weeks, 3 months, 6 months and 12 months	No
Primary	FIM (Functional Independence Measure)		6weks, 3months, 6months and 12months	No
Primary	LEM (Lower Extremity Measure)		6weeks, 3months, 6months and 12 months	No
Secondary	Secondary Outcome Variable: Transfusions		6 weeks, 3 months, 6 months and 12 months	No
Secondary	Pre and Post operative Hgb		6 weeks, 3 months, 6 months and 12 months	No
Secondary	Complications/ Re-operation		6 weeks, 3 months, 6 months and 12 months	No
Secondary	Length of surgery and hospital stay		6 weeks, 3 months, 6 months and 12 months	No
Secondary	Weight bearing status post-op		6 weeks, 3 months, 6 months and 12 months	No