Intracapsular Femoral Neck Fractures Fixation With a Dynamic Locking Plate and Screw System, Targon FN

Intracapsular Femoral Neck Fractures Fixation With a Dynamic Locking Plate and Screw System, Targon FN. Prospective and Retrospective Cohort Study.

The purpose of this study is to evaluate our experience in internal fixation of intracapsular femoral neck fractures with the Targon FN implant prospectively and retrospectively in terms of the outcomes and complications associated with the treatment.

Study Overview

• Status: Unknown
• Conditions: Femoral Neck Fractures
• Intervention / Treatment: Device: TARGON FN

Detailed Description

Intracapsular femoral neck fractures include subcapital and transcervical fractures. They typically occur in a bimodal age distribution, with most occurring in the elderly population. The rest are the result of high energy injury in the young. Management of those fractures is based on few factors related to the patient, such as preinjury ambulatory status, age, cognitive function, and co morbidities, and on factors related to the fracture like the type of the fracture and the degree of displacement. Treatment options include nonsurgical management, fixation (percoutan, CRIF, ORIF) or arthroplasty (hemiarthroplasty, THR). Undisplaced hip fractures are defined as fractures where the inferior cortical buttress is undisplaced on the anteroposterior (AP) radiograph.[1] Undisplaced hip fractures includes fractures impacted in all degrees of valgus regardless of any angulations at the fractures' edges seen on the lateral radiographs. The fractures can be classified using either the Garden or Pauwel classifications for subcapital fracture or transcervical fractures, respectively. In displaced intracapsular femoral neck fractures like Garden type 3 and 4 or in unstable transcervcal fractures like Pauwel type 3 which are subjected to increased shear loads [2], the goals, for a physiologically young and active adult, are to preserve the femoral head, avoid osteonecrosis, and achieve union in order to avoid arthroplasty. Femoral neck fractures in young adults are associated with higher incidences of femoral head osteonecrosis [3-11] and nonunion [3, 4, 7, 12]. The reported rate of osteonecrosis after a femoral neck fracture in young patients ranges from 12% to 86% [3, 6-15]. This complication may lead to collapse of the femoral head and osteoarthritis. Salvage procedures, such as osteotomy, and other reoperations have high failure rates, and arthroplasty procedures are not ideal, given the patient's young age and higher level of activity. The achievement of an anatomic reduction and stable internal fixation is imperative. A review of the Cochrane database revealed 28 randomized or quasirandomized trials of 5,547 patients with femoral neck fractures treated with 19 different pin and/or screw constructs in a variety of configurations. [16] None of the implants had significantly superior results for outcomes related to fracture healing, osteonecrosis, wound infection, pain scores, reoperation rate, use of walking aids, periprosthetic fracture, or mortality.

Recently the Targon FN a new implant for fixation of femoral neck fracture has become available. The Targon FN implant consists of a small side plate with six locking screw ports. The two distal holes are used to fix the plate to the lateral cortex of the femur with angle stable 4.5 mm cortical screws. The proximal holes allow the implementation of up to four "TeleScrews" which cross the fracture site. These 6.5 mm screws are dynamic and allow therewith the collapse of the fracture at the femoral neck. The sliding during the collapse occurs within these screws so that a protrusion of the screws in the lateral soft tissue is prevented. The only report was reported by Martyn Parker MD and was released in Jatros Orthopädie 2008. He reported a serial of 50 femoral neck fractures, 27 (54%) of the fractures were undisplaced and 23 (48%) were displaced. There were two cases of fracture non-union; in one patient the plate became detached. One patient with a non-displaced femur neck fracture showed early radiographic signs of a possible avascular necrosis after one year. The implant was removed and the symptoms improved somewhat.

The purpose of this study is to evaluate our experience in internal fixation of intracapsular femoral neck fractures with the Targon FN implant prospectively and retrospectively in terms of the outcomes and complications associated with the treatment.

• Study Type: Interventional
• Enrollment (Anticipated): 100
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Israel
  • Kfar Saba, Israel
    • Not yet recruiting
    • Meir Medical Center
    • Contact: Benjamin KISH, MD; Phone Number: +972545855125
    • Contact: Chayim Yehuda, MD; Email: dochaim@gmail.com
    • Principal Investigator: Benjamin Kish, MD
  • Tel-Hashomer, Israel
    • Recruiting
    • Sheba Medical Center
    • Contact: Ran Thein, MD; Phone Number: +972544310305; Email: ranthein@gmail.com
    • Principal Investigator: Nahshon Shazar, MD
  • Zrifin, Israel
    • Not yet recruiting
    • Assaf-Harofeh Medical Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• subcapital femoral fracture
• transcervical femoral fractures
• Fractures operated within 7 days
• ASA score 1-3

Exclusion Criteria:

• prior hip surgery
• pathological fractures

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Other: Targon FN; The Targon FN implant consists of a small side plate with six locking screw ports. The two distal holes are used to fix the plate to the lateral cortex of the femur with angle stable 4.5 mm cortical screws. The proximal holes allow the implementation of up to four "TeleScrews" which cross the fracture site. These 6.5 mm screws are dynamic and allow therewith the collapse of the fracture at the femoral neck. The sliding during the collapse occurs within these screws so that a protrusion of the screws in the lateral soft tissue is prevented

Device: TARGON FN; The Targon FN implant consists of a small side plate with six locking screw ports

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
overall survival, fixation survival and a composite end-point combining the two	1 year

Secondary Outcome Measures

Outcome Measure	Time Frame
length of surgery, bleeding, ambulation	1 year

Collaborators and Investigators

• Sponsor: Sheba Medical Center

Publications and helpful links

General Publications

• Dedrick DK, Mackenzie JR, Burney RE. Complications of femoral neck fracture in young adults. J Trauma. 1986 Oct;26(10):932-7. doi: 10.1097/00005373-198610000-00013.
• Protzman RR, Burkhalter WE. Femoral-neck fractures in young adults. J Bone Joint Surg Am. 1976 Jul;58(5):689-95.
• Zetterberg CH, Irstam L, Andersson GB. Femoral neck fractures in young adults. Acta Orthop Scand. 1982 Jun;53(3):427-35. doi: 10.3109/17453678208992237.
• Swiontkowski MF, Winquist RA, Hansen ST Jr. Fractures of the femoral neck in patients between the ages of twelve and forty-nine years. J Bone Joint Surg Am. 1984 Jul;66(6):837-46. doi: 10.2106/00004623-198466060-00003.
• Kofoed H. Femoral neck fractures in young adults. Injury. 1982 Sep;14(2):146-50. doi: 10.1016/0020-1383(82)90049-3.
• Shih CH, Wang KC. Femoral neck fractures. 121 cases treated by Knowles pinning. Clin Orthop Relat Res. 1991 Oct;(271):195-200.
• Lee CH, Huang GS, Chao KH, Jean JL, Wu SS. Surgical treatment of displaced stress fractures of the femoral neck in military recruits: a report of 42 cases. Arch Orthop Trauma Surg. 2003 Dec;123(10):527-33. doi: 10.1007/s00402-003-0579-8. Epub 2003 Sep 2.
• Visuri T, Vara A, Meurman KO. Displaced stress fractures of the femoral neck in young male adults: a report of twelve operative cases. J Trauma. 1988 Nov;28(11):1562-9. doi: 10.1097/00005373-198811000-00007.
• Haidukewych GJ, Rothwell WS, Jacofsky DJ, Torchia ME, Berry DJ. Operative treatment of femoral neck fractures in patients between the ages of fifteen and fifty years. J Bone Joint Surg Am. 2004 Aug;86(8):1711-6. doi: 10.2106/00004623-200408000-00015.
• Upadhyay A, Jain P, Mishra P, Maini L, Gautum VK, Dhaon BK. Delayed internal fixation of fractures of the neck of the femur in young adults. A prospective, randomised study comparing closed and open reduction. J Bone Joint Surg Br. 2004 Sep;86(7):1035-40. doi: 10.1302/0301-620x.86b7.15047.
• Tooke SM, Favero KJ. Femoral neck fractures in skeletally mature patients, fifty years old or less. J Bone Joint Surg Am. 1985 Oct;67(8):1255-60.
• Gautam VK, Anand S, Dhaon BK. Management of displaced femoral neck fractures in young adults (a group at risk). Injury. 1998 Apr;29(3):215-8. doi: 10.1016/s0020-1383(97)00184-8.
• Askin SR, Bryan RS. Femoral neck fractures in young adults. Clin Orthop Relat Res. 1976 Jan-Feb;(114):259-64.
• Garden RS: Low-angle fixation in fractures of the femoral neck. J Bone Joint Surg 43B:647-663, 1961.
• Bartonicek J. Pauwels' classification of femoral neck fractures: correct interpretation of the original. J Orthop Trauma. 2001 Jun-Jul;15(5):358-60. doi: 10.1097/00005131-200106000-00009.
• Parker MJ, Stockton G. Internal fixation implants for intracapsular proximal femoral fractures in adults. Cochrane Database Syst Rev. 2001;2001(4):CD001467. doi: 10.1002/14651858.CD001467.

Study record dates

Study Major Dates

• Study Start: January 1, 2009
• Primary Completion (Anticipated): January 1, 2011
• Study Completion (Anticipated): January 1, 2012

Study Registration Dates

• First Submitted: January 25, 2009
• First Submitted That Met QC Criteria: January 27, 2009
• First Posted (Estimate): January 28, 2009

Study Record Updates

• Last Update Posted (Estimate): September 8, 2010
• Last Update Submitted That Met QC Criteria: September 5, 2010
• Last Verified: September 1, 2010

More Information

Terms related to this study

• Keywords: subcapital femoral fractures; transcervical femoral fractures; TARGON FN
• Additional Relevant MeSH Terms: Wounds and Injuries; Leg Injuries; Femoral Fractures; Hip Injuries; Hip Fractures; Fractures, Bone; Femoral Neck Fractures
• Other Study ID Numbers: SHEBA-09-5582-NS-CTIL