Authors of section

Authors

Raymond White, Matthew Camuso

Executive Editors

Peter Trafton

Open all credits

Nonoperative (casting)

1. Principles

Undisplaced or minimally displaced fractures

Conservative treatment is always recommended for undisplaced or minimally displaced fractures.

nonoperative casting

Displaced fractures

Displaced fractures that can be reduced, and maintain acceptable alignment, can also be treated conservatively, ie, oblique or transverse fractures, especially if the fibula is intact.

nonoperative casting

Long leg cast

Conservative treatment is initiated with the application of a long leg cast.

nonoperative casting

Sarmiento cast

A Sarmiento or patella tendon bearing cast (or PTB) is usually applied as the last stage of treatment for tibia fractures. At 4-6 weeks post injury, the long leg cast is removed and a Sarmiento cast is applied.

nonoperative casting

Teaching videos

AO teaching video: Upper leg circular cast

AO teaching video: Patella tendon bearing cast (PTB)

2. Reduction techniques

Positioning

The surgeon is seated on a low chair. The patient’s knee is flexed over the end of the table; the thigh is supported with padding.

nonoperative casting

Correction of length

Illustration shows manual traction at the ankle to correct length.

nonoperative casting

Correction of angulation

The two Illustrations show correction of varus or valgus deformity, and AP angulation, by manipulation.

nonoperative casting
nonoperative casting

Correction of rotation

Rotation is usually corrected by palpation of the tibial crest, or with the help of an imaginary alignment of the middle of the second toe, the centre of the ankle, and the tibial tubercle.

nonoperative casting

3. Application of a long leg cast

Short leg section of the cast

First apply the short leg section of the cast up to the mid patella.

Mold the plaster as it sets.

Mold in the transverse and longitudinal arches of the foot, and around the malleoli, and mold a posterior bulge for the Achilles tendon.

Smooth the cast along the entire anteromedial border of the tibia.

nonoperative casting

Mold the posterior side of the cast to assume a triangular shape, slightly convex at the anterolateral and -medial border, flat over posterior, anterior compartments and medial surfaces as shown in the illustration.

nonoperative casting

Thigh portion of the cast

When the cast has set, the knee is extended until 5 to 10 degrees short of full extension. Then the thigh portion is applied.

Proximally the cast extends to one third of the femur.

nonoperative casting

Molding of the epicondyles

Mold the cast above the medial and lateral epicondyles.

Trim the ends of the cast, reinforce the foot, and apply a walking heel if preferred.

nonoperative casting

4. Aftercare long leg cast

Mobilize the patient as early as possible.

For 3-7 days, until swelling subsides, the plaster is checked for slackness and adapted if required.

Oblique and spiral fractures are potentially unstable. Slight slipping of the fracture may be accepted, but if evidence of substantial displacement is found, internal fixation should be considered.

The long leg cast is normally applied for 6 weeks. After that it is changed to a Sarmiento or PTB (patella tendon bearing) cast.

nonoperative casting

5. Sarmiento or PTB (patella tendon bearing) cast

Principle

A Sarmiento cast or brace can be used initially in stable fractures in the distal half of the tibia.

Usually, however, the Sarmiento cast follows the application of a long leg cast after 4-6 weeks post injury.

nonoperative casting

Application of the Sarmiento cast

The patient sits on the edge of a table. The foot is steadied.

Stockinet and wool roll are applied, and the plaster extended over the knee.

Molding of the Sarmiento cast

Before setting, the plaster is firmly molded round the patellar ligament. It is then trimmed from the upper pole of the patella round to the upper part of the calf.

Check that knee movement is free before turning down the Stockinet and finishing in the usual way.

A rocker sole may then be applied and weight bearing and knee flexion commenced. The plaster is retained until union is sound.

6. Aftercare Sarmiento cast

Provide crutches, and encourage the patient to be out of bed within 1–2 days, and to bear weight as tolerated.

Usually full, unsupported weight bearing is achieved after 3-6 weeks.

Begin isometric exercises for all muscle groups immobilized in the cast. It is important to see the patient at weekly intervals for the first 4–6 weeks when weight-bearing methods are used. Especially isolated tibial fractures may go into varus position within a couple of weeks after the fracture. Loss of reduction must be corrected early to avoid malunion. There is also high risk of delayed or nonunion.

If correction is not successful, operative treatment is indicated

nonoperative casting

Change of casts

Change casts at 4-to-6-week intervals, depending on the stability of the fracture. Stable fracture patterns and those that gain stability early may be converted to a Sarmiento cast or fracture-brace as early as 4 weeks. Protect tibial fractures for at least 12 weeks. The average healing time is 16–24 weeks. Fracture instability after 24 weeks is considered a delayed union.

This x-ray was taken at 6 months post injury.

nonoperative casting

7. Case presentation wedge cast

nonoperative casting

Post reduction

nonoperative casting

Wedge cast

nonoperative casting
nonoperative casting
nonoperative casting

Six months post injury

nonoperative casting

8. Aftercare

For aftercare and rehabilitation following nonoperative treatment please refer to your local protocol.