Executive Editor: Peter Trafton

Authors: Martin Jaeger, Frankie Leung, Wilson Li

Proximal humerus 11-B2 Limited open reduction; nail fixation

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Glossary

1 Principles top

Converting a 3-part fracture into a 2-part fracture enlarge

Sequence of reduction

  1. Reduce and fix the tuberosity to the humeral head (thereby converting the 3-part fracture into a 2-part situation).
  2. Reduce the proximal humeral segment to the shaft with the nail and fix it.


Greater tuberosity enlarge

Suture reduction and fixation of the greater tuberosity

Sutures in the rotator cuff tendon insertions aid manipulation, reduction, and temporary fixation of a proximal humerus fracture.
Traction on the sutures helps achieve reduction. When tied, they bring the fragments together and stabilize them.


Nail insertiong helps reduce the fracture enlarge

Reduction of the metaphyseal fracture component

If the entry point has been chosen correctly, insertion of the nail will help reduce the fracture.


Correct nail entrance point enlarge

Correct nail entrance point

A proper and precise entrance point of the humeral nail is crucial. An incorrect entry site results in malreduction of the metaphyseal fracture.


Preliminary reduction enlarge

Preliminary reduction of the fracture helps with identification of the correct nail entry site. K-wire “joy-sticks” (as illustrated) or sutures through the rotator cuff insertions aid with reduction.


Marking danger zone around axillary nerve enlarge

Risk of axillary nerve injury

The main structure at risk is the axillary nerve. The axillary nerve should be protected by limiting the incision to less than 5 cm distal to the acromial edge, by palpating the nerve, and by avoiding maneuvers that stretch the nerve during reduction and fixation.


Danger zone around axillary nerve enlarge

Remember the course of the nerve when placing the distal screws.


Tension band suture (rotator cuff) enlarge

Tension band sutures in addition to nail

Sutures placed through the insertions of each rotator cuff tendon increase stability, and should be used as well as the nail and screws, particularly for more comminuted and/or osteoporotic fractures. With osteoporotic bone, the tendon insertion is often stronger than the bone itself, so that sutures placed through the insertional fibers of the tendon may hold better than screws or sutures placed through bone.
These additional sutures are typically the last step of fixation.

2 Reduction and preliminary fixation top

Goals of reduction

The goal of reduction is to restore the normal location of all fracture components. For B2.1 and B2.2 fractures, the humeral head and separated tuberosity must be reduced properly.

The optimal reduction and fixation procedure for the B2 fracture subtypes depends on the involved tuberosity, and whether or not the calcar region is comminuted.

Proximal humeral reconstruction

  1. Reduce and fix the lesser/greater tuberosity to the humeral head (thereby converting the 3-part fracture into a 2-part situation)
  2. Reduce the metaphyseal fracture component to the shaft and fix it

In the following procedure, involvement of the greater tuberosity is assumed. For details for proper reduction in cases of lesser tuberosity involvement, please click here.

Metaphyseal comminution
In B2.3 fractures (with medial metaphyseal comminution), it is necessary to realign the medial column fragments as accurately as possible while preserving their soft-tissue attachments and vascularity. Once healed, the restored medial bony buttress helps prevent varus collapse. With medial comminution, initial fixation must be secure enough to resist varus collapse.
It is also crucial to reduce the humeral head adequately since the combination of remaining varus displacement and medial comminution predisposes to secondary varus collapse and/or implant failure.


Rotator cuff sutures: Subscapularis and supraspinatus tendon enlarge

Place rotator cuff sutures

Subscapularis and supraspinatus tendon
Begin by inserting sutures into the subscapularis tendon (1) and the supraspinatus tendon (2). Place these sutures just superficial to the tendon’s bony insertions. These provide anchors for reduction, and temporary fixation of the greater and lesser tuberosities.


Infraspinatus tendon enlarge

Infraspinatus tendon
Next, place a suture into the infraspinatus tendon insertion (3). This can be demanding, and may be easier with traction on the previously placed sutures, with properly placed retractors, and/or repositioning the arm.


Stay sutures enlarge

Use of stay sutures
Anterior traction on the supraspinatus tendon helps expose the greater tuberosity and infraspinatus tendon.


Preliminary traction suture enlarge

Insert a preliminary traction suture into the visible part of the posterior rotator cuff …


Pull anteriorly enlarge

… and pull it anteriorly. This will expose the proper location for a suture in the infraspinatus tendon insertion. Then the initial traction suture is removed.

Pearl: larger needles
A stout sharp needle facilitates placing a suture through the tendon insertion.


Direct reduction of the greater tuberosity enlarge

Reduction of the greater tuberosity

Direct reduction of the greater tuberosity fragment is performed by pulling the sutures or, …


Instrumentation enlarge

… with instruments (eg, elevator) applied either through the incision (as illustrated) or through a separate stab incision.


Preliminary fix the tuberosity enlarge

Preliminary fix the greater tuberosity

Tighten and tie the transverse sutures in order to preliminarily fix the greater tuberosity fragment. Thereby, the 3-part fracture is converted into a 2-part situation.


Reduction of the head fragment enlarge

Reduction of the head fragment

Distal traction, perhaps augmented with increased angulation, will help to reduce the fracture.


Using an elevator enlarge

Use of an elevator
Sometimes, the incision allows insertion of an elevator to disimpact the humeral head, or to help to correct inclination/torsion and to restore a normal relationship of the medial fracture surface. The proximal fragment should be reduced anatomically to the shaft.
The actual process of reduction is done with image intensifier control.

3 Determination of entry point and opening of the canal top

Position of correct entry point enlarge

Determination of entry point

The nail insertion site lies on the axis of the humeral shaft. It is located at the bone-cartilage junction of the humeral head. It is not more lateral on the greater tuberosity. Therefore, a supraspinatus split is necessary.
It is slightly anterior to the center of the greater tuberosity.
Be aware, that the correct entry point depends on the type and design of nail used.
Note: For simplicity, the following illustrations are shown without sutures inserted at the margins of the supraspinatus split.


Insert K-wire enlarge

Insert a K-wire through the correct entry point and confirm proper placement by image intensification.


Opening the proximal humerus enlarge

Open the humerus

The nail entry track passes through or close to the tuberosity fracture plane. Take care not to displace the tuberosity fracture during passage of awl or drill. Ensure that sufficient bone is removed to allow the nail to pass through the reduced fracture. Confirm this at the end of nailing.
A cannulated awl is recommended for opening the proximal humerus. This awl can be inserted over the previously placed guide wire. It should be advanced into the proximal medullary canal.


Entry point hidden under the acromion enlarge

Pitfall: hidden entry point
If the humeral head is abducted or externally rotated, the entry point is under the acromion. This is typical with varus malaligned fractures.
One has to reduce the humeral head before opening the humeral entry point. A joy-stick technique, as illustrated, is helpful. Alternatively, sutures though the rotor cuff can be used in order to manipulate the humeral head.

4 Nail insertion top

Mounting the nail on the insertion handle enlarge

Mount nail on insertion handle

The humeral nail is mounted on an insertion handle. The nail must be rotated correctly relative to the insertion handle.

If an angled nail is used (as illustrated) ensure that the apex of the nail curvature points away form the insertion handle.


Nail insertion enlarge

Insert nail and reduce fracture

Insert the nail with slightly rotating movements down to the metaphyseal fracture line. Pass the fracture zone under image intensification and make sure that the nail enters the distal fragment properly.


Correct placement of nail enlarge

Make sure the proximal end of the nail is placed beneath the bony surface of the humeral head.
No protrusion of the nail may be tolerated. Confirm with appropriately oriented C-arm images that the nail is below the bone.
The nail illustrated has a transverse spiral blade. At the recommended depth, the spiral blade should lie between the middle and lower third of the humeral head. Depending upon the selected humeral nail, different preoperative planning is necessary for its locking devices.
Be careful not to displace tuberosity fractures when inserting proximal locking components.


Retrotorsion of the humeral head enlarge

Retrotorsion of spiral blade/screw

In order to lock the spiral blade, mount the aiming arm and swivel it approximately 25° anteriorly in order to follow the retroverted axis of the humeral head. (The humeral head axis is directed approximately 25° posteriorly to the condylar plane of the distal humerus.)


Spiral blade position enlarge

Within the humeral head, the spiral blade should be placed at the transition of the middle to the lower third, slightly below the equator.


Mounting aiming device and insertion of trocar combination enlarge

Mount aiming device and insert trocar combination

Mount the aiming device in the insertion handle. Confirm that the retroversion angle is correct. Make a skin incision for the aiming device, dissect the muscles bluntly down to the bone, and fully insert the trocar.


Guide wire insertion enlarge

Insert guide wire

Check once more the retrotorsion of the handle.
Remove the central trocar and drill the guide wire for the spiral blade onto the medial cortex of the humeral head.
The position of the guide wire can be checked under image intensification.
Be aware not to perforate the humeral head in order not to insert a too long spiral blade.


Determination of correct spiral blade length enlarge

Determine length of spiral blade

Determine the correct length of the spiral blade with the appropriate depth gauge.


Opening lateral cortex enlarge

Open the lateral cortex

Perforate the lateral cortex with the appropriate cannulated drill.


Spiral blade insertion enlarge

Insert spiral blade

Attach the spiral blade to the inserter and introduce both over the guide wire.
Align the handle of the inserter parallel to the aiming arm.
The initial rotation of the T-handle of the spiral blade inserter relative to the aiming arm depends on patient anatomy. If the distance from the lateral cortex to the nail is less than 10 mm, start the inserter slightly clockwise from parallel. If the distance from the lateral cortex to the nail is more than 10 mm, start the T-handle slightly counter-clockwise from parallel.
By applying light controlled hammer blows to the connecting screw, advance the spiral blade to the desired depth. This causes the handle to rotate 90°.


tension band sutures for the rotator cuff enlarge

Pearl: tension band sutures for the rotator cuff
Place these in the base plate of the spiral blade before the blade is fully inserted.

Monitor the depth of the spiral blade with image intensification. If attaching sutures to the spiral blade, pause when the spiral blade is approximately 1.5 cm to 2.0 cm short of its intended position so that the suture ends can be placed through the appropriate holes in the base blade.


Checking position of spiral blade enlarge

Check position of spiral blade

Check the position of the spiral blade by image intensification.

Pitfall: captured bicipital tendon
If the chosen nail has locking screws that might pass through the bicipital groove, be careful that they do not trap the bicipital tendon.


Locking screw enlarge

Drill and determine length of locking screw

For distal locking, insert the two-piece trocar combination (aiming arm). Through an appropriately placed trocar, drill through both humeral cortices until the bit just breaks through the medial cortex, and read the depth from the drill bit. Alternatively, a depth gauge can be used.
Insert a locking screw through the trocar. A second screw is recommended, especially in osteoporotic bone.

Pearl: make one incision large enough to allow palpation of the axillary nerve.


End cap insertion enlarge

Insert the end cap

The end cap prevents tissue from plugging the inner thread of the nail. Furthermore it offers the option of angular stability, by compressing the spiral blade.
End caps are available in different sizes and can, if necessary, be used to extend the nail. The top of the end cap must not protrude above the surface of the bone.


Supplementary rotator cuff tendon sutures enlarge

Supplementary rotator cuff tendon sutures

Rotator cuff tension band sutures are placed using the sutures previously placed in the spiral blade base plate.


Repair of rotator cuff enlarge

Repair rotator cuff

Suture the supraspinatus split.

v2.0 2011-05-02