Posterior Knee Splint Kit — Orthopedic Knee Splint for Sprain, Fracture & Leg Immobilization
The professional-grade posterior knee splint — an orthopedic knee support splint and leg immobilization splint — used by emergency departments and orthopedic clinics. If you've been searching for a knee support splint, splint for knee sprain, knee pain splint, knee injury support, posterior leg splint, or a knee immobilization brace alternative — this professional fiberglass kit is the clinical-grade solution. Same posterior knee immobilization from thigh to ankle. Lighter weight. Faster setting. More durable than plaster. Fully removable for wound checks and hygiene.
This complete professional-grade kit includes pre-padded synthetic fiberglass splint material, self-adhesive bandages, and synthetic padding for quick, effective knee sprain treatment and fracture immobilization — with no additional materials needed. Sets in just 5–7 minutes.
Medical Uses & Indications
- Knee Sprain Treatment — Splint for knee sprain: ACL, PCL, MCL, and LCL ligament injuries requiring immobilization
- Patella Fractures — Kneecap fractures requiring full leg immobilization
- Tibial Plateau Fractures — Upper tibia fractures at the knee joint
- Knee Dislocations — After reduction and stabilization
- Knee Injury Support — Quadriceps/patellar tendon injuries and partial tears
- Post-operative Immobilization — After knee surgery; replaces a knee immobilization brace in the acute phase
- Knee Pain Splint — Immobilization for acute knee pain from trauma or post-surgical swelling
Key Features
- Orthopedic Knee Splint: Professional-grade fiberglass — the same orthopedic knee support used in ERs and orthopedic clinics
- Leg Immobilization Splint: Full-length posterior design runs from upper thigh to ankle for complete knee and leg immobilization
- Posterior Leg Splint Design: Applied to the back of the leg — allows swelling while maintaining rigid immobilization
- Soft Cast / Removable Half Cast: Can be removed for wound checks, hygiene, and follow-up imaging
- Pre-Padded Design: Padding already built into splint material — no extra layers or stockinette needed
- Quick-Setting: Hardens in just 5–7 minutes for fast patient care
- Complete Kit: Includes splint, self-adhesive bandages, cast padding, and gloves
- Prevents Flexion/Extension: Stops harmful knee movement during healing
- Radiolucent: Compatible with X-ray imaging without removal
- Multiple Sizes: Child through adult sizing available
- Color Options: White, Black, and Hot Pink bandage colors available
What Is a Posterior Knee Splint / Orthopedic Knee Support Splint?
A posterior knee splint — also called an orthopedic knee splint, leg immobilization splint, or posterior leg splint — runs along the back (posterior) side of the leg from the upper thigh past the knee down to the ankle. It is the standard knee injury support device used in emergency departments for acute fractures, dislocations, and severe ligament injuries requiring complete leg immobilization.
Unlike a standard knee brace (which allows movement and is used in rehab), this orthopedic knee splint provides rigid immobilization — functioning as a knee immobilization brace in the acute phase. It is the go-to splint for knee sprain treatment at the Grade II–III level, and the primary knee sprain treatment device in emergency orthopedic care. Historically made from plaster of Paris, modern clinical practice has shifted to fiberglass — which sets faster, weighs significantly less, and is far more durable.
Kit Contents by Size
| Size | Splint Dimensions* | Self-Adhesive Bandage | Synthetic Padding |
|---|---|---|---|
| Child 6–12 | 4" × 30" | 2 Rolls 3" | 1 Roll 3" |
| Teen/Small Adult | 5" × 30" | 2 Rolls 3" | 1 Roll 4" |
| Adult | 6" × 30" | 2 Rolls 3" | 2 Rolls 4" |
* Trim the splint to the correct length for the individual patient. Check your kit packaging for exact dimensions as sizes may vary by configuration.
How to Apply a Posterior Knee Splint
Why Buy Direct Instead of at Your Doctor's Office?
Purchasing your posterior knee splint or orthopedic knee support splint directly from OrthoTape offers significant advantages over getting it at your doctor's office or emergency room. Emergency room splint applications can cost $300–600 or more when billed through insurance, while our complete kit costs a fraction of that. Our splint materials are the same professional-grade products — if not better — than what your doctor or ER uses, meeting or exceeding all industry standards.
Many medical offices have limited inventory and may only stock basic white bandages, while we offer multiple color options. By ordering from us, you get exactly what you need at a fraction of the cost, with fast shipping directly to your door. Knee splint for sale — direct from the supplier, shipped from our NJ and CA warehouses.
Frequently Asked Questions — Posterior Knee Splint & Knee Sprain Treatment
What is a posterior knee splint and how is it different from a knee brace?
A posterior knee splint (also called an orthopedic knee splint or leg immobilization splint) provides rigid full-leg immobilization from the upper thigh to the ankle — used acutely for fractures, dislocations, and severe ligament injuries. A standard knee brace allows controlled movement and is used during rehabilitation. A knee immobilization brace is a rigid device similar in function to a posterior splint. If your doctor ordered rigid knee immobilization, this fiberglass posterior splint is the clinical-grade solution used in emergency departments.
Is this a good splint for knee sprain treatment?
Yes — this is the standard splint for knee sprain used in emergency departments for Grade II–III ligament injuries (ACL, PCL, MCL, LCL). It provides complete knee injury support and leg immobilization during the acute phase, preventing harmful flexion and extension while swelling subsides. After the acute phase, patients are typically transitioned to a hinged knee brace for rehabilitation. Always follow your orthopedic surgeon's specific protocol for knee sprain treatment.
Is a posterior knee splint the same as a soft cast or removable half cast?
Yes — a posterior knee splint is the clinical name for what patients commonly call a soft cast, half cast, or removable cast for the knee. Unlike a full circumferential plaster cast, it covers only the back (posterior) of the leg — which is why it's also called a half cast. The soft cast design allows room for swelling and can be removed for wound checks, hygiene, and follow-up imaging.
What is a posterior knee splint used for?
A posterior knee splint is used to immobilize the knee following fractures, dislocations, or severe ligament injuries. As a knee injury support device, it runs along the back of the leg from the upper thigh to the ankle, preventing harmful flexion and extension during healing. It is the standard of care for patella fractures, tibial plateau fractures, knee dislocations, severe ACL/PCL/MCL/LCL injuries, and post-operative knee immobilization.
How long do you wear a posterior knee splint after a fracture or sprain?
For knee sprain treatment: Grade II–III sprains typically require 2–6 weeks of splinting followed by a hinged brace and physical therapy. Patella fractures typically require 4–6 weeks of immobilization. Tibial plateau fractures may require 6–12 weeks. Knee dislocations typically require 3–6 weeks of splinting. Your orthopedic surgeon will determine the appropriate duration based on imaging and clinical assessment.
Can a posterior knee splint be used after ACL or PCL surgery?
Yes. This orthopedic knee splint is commonly used in the immediate post-operative period following ACL reconstruction, PCL repair, and multi-ligament knee surgery to protect the repair and control swelling. After the acute phase (typically 1–2 weeks), patients are usually transitioned to a hinged knee brace that allows controlled range of motion. Always follow your surgeon's specific post-operative protocol.
What size posterior knee splint should I order?
Select based on patient age and leg size. This leg immobilization splint must run from the upper thigh to just above the ankle for proper immobilization. If between sizes, size up for better coverage. Check your kit packaging for exact splint dimensions as configurations may vary.
Explore Other Fiberglass Splint Kits
Looking for a different splint type? OrthoTape offers complete fiberglass splint kits for upper and lower extremities — all with the same pre-padded, ready-to-apply design:
| Splint Kit | Best For |
|---|---|
| Posterior Ankle Splint Kit | Ankle fractures, sprains & Achilles injuries |
| Ankle Stirrup Splint Kit | Lateral ankle stability |
| Long Arm Splint Kit | Elbow fractures & dislocations |
| Volar Wrist Splint Kit | Wrist fractures & sprains |
| Volar/Dorsal Wrist Short Arm Splint Kit | Short arm immobilization |
| Sugar Tong / Reverse Sugar Tong Wrist Kit | Distal radius & Colles' fractures |
| Ulnar Gutter Splint Kit | Boxer fractures (4th/5th metacarpal) |
| Thumb Spica Splint Kit | Thumb fractures & sprains |
→ View All Fiberglass Splint Kits
OrthoTape is an authorized dealer of all products sold on this site. This product should be applied by a trained medical professional or for educational training. Always consult a doctor before use for proper diagnosis and treatment. Knee injuries should be evaluated by a medical professional to rule out serious fractures, ligament damage, or vascular complications. FSA/HSA eligible — check with your plan administrator. HCPCS: A4570.