The philosophy behind the tension band for the olecranon is that it converts tensile forces on the posterior side of the olecranon into compression forces at the joint line during flexion. The fixation is simple and inexpensive and works well if executed properly.
Multifragmentary fractures cannot be fixed with a tension band. In order to be able to use a tension band, the anterior (far) cortex cannot be comminuted and must provide a buttress to allow compression.
Choose a wire of sufficient strength to withstand the tensile forces generated in the figure-of-eight loop (1.0 mm). Positioning the K-wires as close to the joint while also penetrating the volar cortex is paramount.
Pearl: Depending on the size of the proximal bone fragment, it can either be excised and the tendon reinserted, or it can be reinserted and stabilized with an additional interfragmentary screw or tension band wiring.
AO teaching video: Olecranon—transverse fracture 21-B1 tension band wiring
There is almost always a small spike on one of the fragment sides that exactly fits into a gap on the opposite fragment.
Reduce and hold the reduction of the transverse olecranon fracture with one or two small pointed reduction forceps.
Pearl: To prevent the reduction clamp from slipping on the distal fragment, a small drill hole can be drilled in the distal fragment before applying the clamp.
Approximately 40 mm distal to the fracture line and 5 mm from the posterior cortex, drill a hole through the ulna with a 2.0 mm drill, using a sharp drill guide as the drill tends to slide dorsally.
Wire preparation and insertion
Prepare a 1.0 mm wire by making a loop approximately one third along its length.
Insert the shorter segment of the wire through the drilled hole from medial to lateral. As the ulnar nerve is medial it is safer to introduce the wire from this side.
Using the drill guide, introduce the first 1.6 mm K-wire medially through the proximal end of the olecranon. Aim the drill towards the anterior cortex, passing as close as possible to the joint. Leave enough space on the lateral side for the second K-wire.
Drill the K-wire through both cortices.
Insert the drill guide over the first K-wire, and insert the second 1.6 mm K-wire parallel to the first one.
Check the position of both K-wires on the C-arm. If the position of wires and fracture reduction is good, pull both K-wires back approximately 1 cm.
The small pointed reduction forceps can now be removed.
Pass the long segment of the wire (bearing the loop) in a figure-of-eight configuration beneath the triceps tendon around the protruding ends of the K-wires.
Unite the two wires with a little twist.
Note: Make sure that loop and wire twist do not lie too close to the wire hole to avoid unnecessary tension at the wire hole.
Placing the loops more proximal will allow a smaller incision when removing them after healing.
Tightening the wire
Loosely prepare the wire twist ensuring that each end of the wire spirals equally - the twist should not comprise one spiral around a straight wire.
Cut the wire ends short.
The slack is then taken up by further twisting. Repeat this until the desired tension is achieved. Both loops must be tightened at the same time and in the same direction, to achieve equal tension on both arms of the wire.
By tightening the twist and the loop with two pliers simultaneously, the two fragments are drawn together such that the fracture is placed under compression.
Note: Avoid excessive tensioning, especially in osteoporotic bone.
Prevent later soft-tissue irritation
Trim the twisted wire and turn both ends towards the ulna/olecranon in order not to irritate the soft-tissues later.
Sinking the K-wires
With the help of a pliers, bending iron and forceps, bend the proximal end of the K-wires 180 degrees.
Cut the K-wires leaving a bend of about 5-6 mm. Make a small cut in the triceps to allow burial of the K-wires. The K-wires are then driven home, sinking their curved ends into the bone in order to prevent backing out and skin irritation. Closing the small cut in the triceps over the K-wires will help prevent backing out of the wires.
Confirm fracture stability and range of motion, including supination-pronation. Exclude K-wire impingement of the radial ulnar joint. Final x-rays or image intensifier views should demonstrate good reduction and proper hardware position.
Pearl: Intramedullary screw
As an alternative, one intramedullary screw or two intramedullary K-wires may be used instead of the two K-wires penetrating the anterior cortex.
Introduce a 6.5 mm cancellous screw with a 32 mm thread and a washer inside the canal. The screw should cross the fracture site at least 7 cm.
Choose the screw long enough to purchase in the inner cortex of the diaphyseal area. Usually, a screw of 10-12 cm length is appropriate.
Make a stab incision through the triceps tendon insertion to place drill and screw. When tightening the screw make sure not to over compress the fracture.
As the ulna has a slight bend distal to the metaphysis the long intramedullary screw can cause displacement when engaging the isthmus of the intramedullary canal distally.
AP and lateral X-rays of a displaced olecranon fracture in a 75 year old female.
Positioning of patient supine with elbow pointing upward with a fracture marked on the skin.
A drill hole has been made in the more distal ulna for passing of heavy gauge wire for the construction of a figure of eight tension band wire,
The fracture site is cleaned and osteochondral damages to the two surfaces of the joint is assessed.
The fracture is reduced and held with two longitudinal K-wires up the shaft of the more distal ulna. The two K-wires on either side of the olecranon are temporarily inserted to prevent comminution on either side of the osteoporotic olecranon.
A large bore needle (14 gauge) is used to pass the heavy gauge wire deep to the triceps tendon to create a figure of eight.
The fracture is seen with the ends of the wire ready to be joined.
In this case, a second wire was passed through the drill hole in the ulna, so that a second figure of eight could be created.
The ends of the first wire are twisted together, but not yet tightened.
A second pair of pliers (in this case a vise grip) is used to create a twist on the opposite side.
The figure of eight wire is tightened by twisting on both sides simultaneously.
The second wire has been used a second figure of eight which has also been tightened with a twist on both sides.
The longitudinal K-wires are bent past 90° and then cut.
With the two wires cut, they are ready to be turned 180° and then impacted into the olecranon.
Final clinical intraoperative picture.
Lateral intraoperative image
3 weeks X-ray images.
The ends of the K-wires have not been fully impacted into the olecranon.
3 weeks clinical photographs
12 weeks X-ray images with fractures healed. Note that one of the K-wires has backed out a little.
12 week clinical photographs.