Authors of section

Authors

Jonas Andermahr, Michael McKee, Diane Nam

Executive Editor

Joseph Schatzker

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ORIF - Lag screw fixation

1. Principles/Introduction

In a multifragmentary fracture of the glenoid fossa, the small fragments are often too small to fix with the standard 3.5 conventional/cannulated screws. Typically, the following mini-fragment screws are then used:

  • Conventional 2.0 or 2.7 lag screws
  • Headless 2.4 screws (cannulated)

Headless screws are preferable where fixation involves putting them through capsule or labrum.

In addition, they are the smallest cannulated screw system.

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2. Patient preparation

Depending on the approach, the patient may be placed in the following positions:

3. Approach

The approach will depend on the fracture pattern.

If the trans-glenoid fracture line run from posterior superior to low anterior or if the fracture line is horizontal, then both the deltopectoral or dorsal approach can be used.

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If the fragments are small and lag screw fixation from anterior is not possible, then a posterior approach and fixation is carried out.

4. Reduction

One K-wire is partially inserted in the main fragment and is used as a joystick for reduction. If conventional screws are to be used for fixation, make sure that the fragment is big enough to take the head. Otherwise use the headless screw.

K-wires and screws must be extra articular.

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When reduction is completed, insert the K-wires further to secure temporary fixation of the fracture.

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The size of the fragments determines their fixation. At times, if the fragment is very small, a K-wire will serve as its definitive fixation. Otherwise, use either the headless screw or the small fragment cannulated screws.

Depending on the size of the main fragments, one or two appropriate length screws are then inserted…

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... and the K-wires are removed. Smaller fragments may be keyed into place and held by the larger fragments.

Sometimes one must resort to an anchor if the fragment is very small as well as a small spring plate.

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Use the image intensifier to check your reduction prior to any definitive fixation. At the end, check once again with the image intensifier to make sure that there is no intra articular metal.

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5. Aftercare

Introduction

For postoperative treatment of surgically operated scapular fractures and nonoperative treatment of fractures of the scapula which are treated conservatively is basically the same.

The decision to operate or not to operate is made on the basis on the fracture type, the degree of fragment displacement and the intrinsic fracture stability. The stability of a fracture can be further determined with the aid of an image intensifier.

Phase I: Day one

It is important to maintain full mobility of the unaffected joints to reduce arm swelling and to preserve joint motion. The following exercises are recommended.

  • Straightening and flexion of the elbow


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  • Open and closure of the hand
  • Squeezing of a soft ball


Aftercare/Nonoperative Scapula

  • Bending of the wrist forward, backwards and in a circular motion.
  • Movement of an open hand from side to side.


nonoperative treatment

  • Squeezing the shoulder blades together, while shoulders remain relaxed


Aftercare/Nonoperative Scapula

Phase II: Two to six weeks

Pendular exercises can be started when pain starts to subside after the first few days.


nonoperative treatment

One progresses gradually from passive to assisted active range of motion exercises making sure that assisted active abduction is done without elevation of the shoulder.


Aftercare/Nonoperative Scapula

Active assisted range of motion exercises are started with:

  • External rotation
  • Internal rotation
  • Forward flexion with the arms on the table
  • Forward flexion and elevation of the arm with a ball on the wall


Aftercare/Nonoperative Scapula

Sub-maximal isometric exercises with:

  • Internal rotation
  • External rotation
  • Abduction
  • Extension

Note: Timing and progression of exercises is ultimately directed and determined by the operating surgeon since such factors as bone quality, type of fracture and fixation may vary from case to case.


Aftercare/Nonoperative Scapula

Sling and swath

Optimal shoulder immobilization is achieved when the upper arm and forearm are secured to the chest. Traditionally, this has been done with a sling that supports the elbow and forearm and counteracts the weight of the arm. The simplest sling is a triangular bandage tied behind the neck.

Additional support is provided by a swath which wraps around the humerus and the chest to restrict further shoulder motion, and keep the arm securely in the sling.
Commercially available devices provide similar immobilization, with or without the circumferential support of a swath.


glenoid fossa extraarticular simple

Shoulder immobilization

Sling and swath (A), shoulder immobilizer (B), Gilchrist bandage (C), and other such devices all provide essentially similar support for the shoulder joint.


Activities of daily living

Sleeping
The patient should sleep wearing the sling and lie either on his back or on the non-injured side.

When sleeping on the back, the injured side should be supported by placing a pillow underneath the arm and shoulder.

Some patients may find it more comfortable to sleep in a sitting or semi reclined position.


Sleeping

When sleeping on the side, a pillow can be placed across the chest to support the injured side.


Sleeping

Hygiene

A non-slip mat in the shower/bath tub will improve safety. The arm can hang gently at the patient's side while showering. Axillary hygiene is important. If assistance is not available, a long-handled sponge can be used to wash the back and legs.


Hygiene

Dressing

Loose fitting clothing and button-up shirts are ideal. The unaffected arm may be used for buttoning and unbuttoning. The affected arm is dressed first, then the non-affected arm. When undressing, start with the non-affected arm, then the affected arm.


Dressing

Shoulder abduction cushion

In the case of coracoid fractures or acromial fractures and rotator cuff surgery, one attempts to relieve tension by elevation and abduction of the extremity. This can be achieved with the aid of a so-called airplane splint or an abduction cushion as shown in this diagram.


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Mobilization: 2-3 weeks posttrauma

Nonoperative management of scapular fractures usually begins with maximal support - a sling and swath equivalent worn continuously. If the patient finds lying down uncomfortable, then a sitting position may be preferred for sleeping.

A patient who is very comfortable, at the beginning of treatment or after some recovery, may need less immobilization, and even begin gentle use of the injured arm.

The degree of required immobilization and the rate progression may be speeded up as comfort permits.


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When pain permits, begin with pendulum exercises (as illustrated).


nonoperative treatment

At the same time active hand and forearm use should also be encouraged.


Aftercare/Nonoperative Scapula

Isometric exercises can begin as soon as tolerated for the shoulder girdle including scapular stabilizers, and the upper extremity.
X-rays should be checked to rule out secondary fracture displacement.


Aftercare/Nonoperative Scapula

Active assisted exercises: 3-6 weeks postoperative

As comfort and mobility permit, and fracture consolidation is likely, the patient should begin active assisted motion. Physical therapy instructions and/or supervision are provided as desired and available.

If passive range of motion exercises are progressing satisfactory, one can then cautiously progress to active assisted.

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Shoulder therapy set: 3-6 weeks postoperative

A “shoulder therapy set” might be helpful. Typically included devices are:

  • An exercise bar, which lets the patient use the uninjured left shoulder to passively move the affected right side.
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  • A rope and pulley assembly. With the pulley placed above the patient, the unaffected left arm can be used to provide full passive forward flexion of the injured right shoulder.

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Strengthening: from week 6 on

As passive motion improves, and active assisted exercises progress satisfactory, and the fracture becomes fully consolidated one can begin strengthening. First one strengthens by active motion against gravity. To increase muscle strength, one must increase the resistance against which the muscles are working. Endurance training follows.

Beware of premature forward flexion which is done passively but puts a significant strain on the supraspinatus and its repaired tendon.

Elastic devices are useful in providing varying degrees of resistance. Ultimately the athletic patient can progress to resistance machines and free weights.

Physical therapy instruction and supervision may be helpful for optimal rehabilitation or if the patient is not progressing satisfactorily.
Remember to monitor rotator cuff strength. Significant weakness may indicate an unidentified rotator tendon cuff rupture which is in need of surgical repair.


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Pitfall: shoulder stiffness

To reduce the risk of stiffness, immobilization should be discarded as soon as possible. This can be done progressively, beginning with elimination of the swath (circumferential bandage) during the daytime and encouraging pendulum exercises.
The sling may be used on a part-time basis as soon as appropriate.
If formal physical therapy has not been prescribed, it should be considered for any patient whose range of motion is not improving as expected.

nonoperative treatment