{'fraction_non_alphanumeric': 0.013550135501355014, 'fraction_numerical': 0.006323396567299007, 'mean_word_length': 4.8936170212765955, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Periarticular Injection Technique to Enhance Pain Relief After Knee Arthroplasty

Introduction
Currently, a popular form of pain control following total knee arthroplasty is the use of periarticular injections; how the medications are injected is a critical step in the efficacy of this modality.


Step 1 Setup
The setup includes the injection fluid and two control syringes with a 22-gauge needle.


Step 2 Inject the Lateral Femoral Periosteum
Inject around the femur before placing the implants.


Step 3 Inject the Posterior Aspect of the Capsule
This is another area of rich innervation that needs to be injected carefully.


Step 4 Inject the Medial Periosteum
Use a similar technique of slow small-volume injections, watching for the periosteal wheal or elevation off the bone.


Step 5 Inject the Capsule and Skin
Include the lateral gutter and proximal extensor mechanism as well as around the patella, with minimal injection into the skin.


Results
Careful injection technique improves the outcome of periarticular injections for pain control. Indications ContraindicationsPitfalls & Challenges.