Hip Joint Injection

Article Author:
Dawood Tafti
Article Editor:
Donald Schultz
Updated:
7/31/2020 2:59:55 PM
PubMed Link:
Hip Joint Injection

Introduction

Hip pain is a common clinical complaint and a source of disability with an incidence of 12 to 15 percent among all adults over the age of 60 years.[1][2] Radiographic hip osteoarthritis affects 27% of adults above the age of 45 years.[3] A lifetime risk of 25% is seen in those who are older than 85 years of age and with a 10% lifetime risk for eventual total hip replacement.[4][5] Osteoarthritis of the hip involves a progressive loss of articular cartilage. Subchondral cysts, osteophyte formation, and synovial inflammation can subsequently develop. Therapeutic hip joint injection with corticosteroids, hyaluronic acid, and plasma-rich platelets have formed the cornerstone of non-surgical management of hip pain.

The important aspects of a fluoroscopic guided hip joint injection include:

  • Minimize patient discomfort
  • Maintain patient safety
  • Maintain proper needle technique in accessing the intraarticular joint space

Anatomy and Physiology

The hip joint is composed of the articulation of the femoral head and the acetabulum. The femoroacetabular joint is a ball-in-socket synovial joint and is stabilized by accessory elements that include different ligament restraints.[6] The complex biomechanics of this joint allows for a wide range of activities that include maintaining a steady gait, rising from a seated position, and adequately ambulating.[7] The ileum, pubis, and ischium constitute the pelvis. Together they form the acetabular socket, which articulates with the femoral head. At any given time, approximately 40% of the femoral head is covered by the acetabulum.[8] The labrum provides additional stability and is made up of a rim of collagen fibers.[9] The pubofemoral, ischiofemoral, and iliofemoral ligaments form the joint capsule providing additional stability to the hip joint.[10] Hip osteoarthritis is deterioration and loss of articular cartilage of the femoroacetabular joint. Subchondral bone, the associated ligaments of the hip joint, and the synovium are also progressively affected in varying degrees. The pathogenesis of osteoarthritis is complex; however, it is generally accepted that various biomechanical factors and environmental factors, as well as a contribution of general wear-and-tear through time, play a role in the development of osteoarthritis. 

Indications

The indications for access to the hip joint include:

  • Alleviation of pain
  • Diagnostic evaluation to determine the source of pain
  • Joint aspiration

Contraindications

Absolute contraindications include, but are not limited to:

  • Septic arthritis
  • Cellulitis at or near the skin entrance of the injection needle
  • Bacteremia
  • Acute fracture
  • Anaphylaxis/allergy to injected therapeutic agents

Equipment

Equipment, including needle gauge, and pharmacotherapeutic mixtures vary institutionally and can be operator-specific. The following list includes a brief overview of possible equipment used for the described procedure.

Potential equipment for a femoroacetabular joint injection include:

  • Fenestrated drape or towel drapes
  • Fluoroscopy machine
  • 1 milliliter (mL) to 3 mL of 1% lidocaine hydrochloride for local anesthesia
  • 23-gauge spinal needle
  • 2 mL to 4 mL of iodinated contrast
  • For corticosteroid injections: Approximately 3 mL of a mixture of 1% lidocaine (2 mL) and triamcinolone 40 mg/mL (1 mL)

Personnel

Personnel includes:

  • Clinician performing the injection
  • A radiology technologist trained in using the fluoroscopy machine

Preparation

A thorough discussion with a patient prior to the procedure includes the following:

  • A detailed explanation of the procedure
  • The expected level of discomfort
  • A thorough evaluation of the skin entry site
  • Prior medical conditions or surgeries that might affect the procedure, to include joint prosthesis
  • Potential diagnoses resulting from the procedure
  • Potential complications of the procedure

Prior to beginning the fluoroscopic procedure, appropriate lead aprons are worn by all personnel involved. The patient is placed in a comfortable supine position. The patient's lower extremity is placed in either neutral position or is slightly internally rotated to around 10 degrees. Small weights can be placed lateral to both feet to limit motion and to maintain a neutral leg position throughout the procedure. A brief fluoroscopic image is obtained with a metallic marker stick overlying the lateral aspect of the femoral head-neck junction in order for the operator to visualize and plan the proposed needle trajectory. The skin is then marked at the proposed site of entry. 

Technique

After the skin is marked, the local subcutaneous soft tissues are anesthetized with 1 mL to 3 mL of 1% lidocaine hydrochloride for local anesthesia. A 23-gauge 3.5-inch spinal needle is then used with a stylet in place with an anterior/vertical approach entry through the soft tissues until the femoral head-neck junction cortex is reached. Intermittent fluoroscopy allows for careful centering of the needle hub over the needle tip to ensure a precise perpendicular approach into the joint space. The needle is slightly retracted to avoid immediate termination within the femoral neck hyaline cartilage. The stylet is removed, and a small volume of anesthetic is then injected to ensure low-pressure intra-articular placement and anesthetization of the cortical surface. A test contrast injection with approximately 0.5 mL to 2 mL of contrast ensures that the needle does not terminate within an adjacent bursa and is truly intra-articular. A syringe containing the corticosteroid with or without a connecting tube is then attached to the 23-gauge needle, and the corticosteroid is subsequently injected into the joint. 

Complications

Complications are rare and include:

  • Exacerbation of baseline pain, especially the night of the procedure which may be related to bland synovitis
  • Allergic reaction
  • Small vessel injury

The patient's prior imaging should be reviewed to assess for aberrant/variant anatomy. 

Clinical Significance

Hip pain is one of the most common outpatient musculoskeletal complaints with a reported prevalence of 19% for those above the age of 65 years.[11] An estimated 27 million individuals are affected by hip pain.[12] Hip pain and related dysfunction have a significant impact on the quality of life. Underlying inflammation from osteoarthrosis related to aging and trauma usually underlies the pathogenesis of acute and chronic pain of the femoroacetabular joint. Older age, obesity, genetics, and occupations involving heavy impact activities and heavy manual work are predisposing factors.[13][14][15][16] 

Nonpharmacological therapies include low impact activity exercise regimens such as aquatic exercises.[17][18] Early osteoarthritis is also often treated with physical therapy.[19] Weight reduction, hot/cold treatment, and assistive devices such as crutches also play a role in the management of hip pain.[20][21] Intraarticular injections with hyaluronic acids, corticosteroids, and platelet-rich plasma provide short term relief and play a role as an adjuvant therapy to other non-operative modalities.[22] A 2016 systematic review found that intraarticular corticosteroid injection of the hip joint provided short term pain relief in patients affected by osteoarthritis-related pain.[23] Data involving pain relief with hyaluronic acid and platelet-rich plasma vary, but also generally demonstrate efficacy.[24][21] Fluoroscopic guidance for injections described in this article helps in avoiding critical structures of the hip joint with enhanced needle guidance.

Enhancing Healthcare Team Outcomes

The role of a radiology technologist is exceptionally important in helping the operator during the procedure. Patient comfort is critical in properly performing the procedure as significant patient movement can affect satisfactory targeting of the hip joint. Movement can also affect needle trajectory with a potential injury of the femoral neuro-vasculature. The technologist plays an important role in assisting in fluoroscopic image acquisition. Documentation of immediate pain relief is important for the referring provider, as this can help further manage treatment. 



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References

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