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Immobilisation - Zimmer splint (knee)

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Patella fractures

Patella tendon ruptures

Post-reduction patella dislocation

Contraindications (absolute in bold)

Open fractures

Neurovascular compromise

Complex fractures

Ligament injuries (managed with soft brace or hinged knee brace)


Open reduction internal fixation

Knee hinged range of motion brace

Long leg backslab

Informed consent

Verbal consent

Less complex non-emergency procedure with low risk of complications

Potential complications


Abrasions and pressures sores (with risk of infection)

Joint stiffness

Procedural hygiene

Standard precautions

PPE: non-sterile gloves




Procedural clinician and one assistant


Zimmer splint


Patient seated with leg resting in extension on stool

Assistant supporting weight of leg off bed


Undo straps on Zimmer splint

Place splint under leg, ensuring hole is at level of patella

Pull padding closed over anterior leg

Secure with straps (above the knee, below the knee and then other straps)

Post-procedure care

Orthopaedic discussion

Confirm immobilisation by Zimmer splint appropriate

Confirm duration of application and whether splint can be removed at any time (e.g. washing)

Obtain weightbearing status

Obtain follow-up

Discharge preparation

Document orthopaedic discussion and follow-up for patient

Consider providing crutches to aid mobility (depending on weightbearing status)

Ensure patient comfort

Advise to return for assessment if increasing pain, numbness or skin colour changes


Zimmer splints immobilise without allowing movement at the knee. This risks significant knee stiffness and should not be taken lightly. A hinged range of movement brace immobilises while allowing for a range of flexion and extension. This is important for ligamental injuries where we wish to limit valgus and varus forces while preventing stiffness. The suggested range of movement depends on the injury.

We suggest Zimmer splints and range on movement hinged braces only be used in discussion with orthopaedics. If the injury is serious enough to need these two orthopaedic appliances, the method of immobilisation, weightbearing status, range of movement and follow-up should be discussed.

Peer review

This guideline has been reviewed and approved by the following expert groups:

Emergency Care Institute

Please direct feedback for this procedure to


NSW Agency for Clinical Innovation. Orthopaedic/musculoskeletal. Sydney: ACI; 2020. Available from

Roberts JR, Custalow CB, Thomsen TW. Roberts and Hedges’ clinical procedures in emergency medicine and acute care. 7th ed. Philadelphia, PA: Elsevier; 2019.

Dunn RJ, Borland M, O’Brien D (eds.). The emergency medicine manual. Online ed. Tennyson, SA: Venom Publishing; 2019.

Eiff MP, Hatch R. Fracture management for primary care. 3rd ed. Philadelphia PA: Saunders; 2011.

Stracciolini A. Basic techniques for splinting of musculoskeletal injuries In: UpToDate. Waltham (MA): UpToDate. 2019 April 18. Available from:

Liverpool hospital emergency department: Plaster booklet (2019)

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