Clinical Guidelines and Nursing Management of Total Joint Arthroplasty

Overview and Epidemiology of Total Joint Replacement

• Definition of Total Joint Replacement (TJA): Also known as total joint arthroplasty, TJA is a surgical procedure designed to repair articulating surfaces within a synovial joint to restore smooth surface function. While most commonly associated with the hip and knee, it can involve any joint in the body, including the shoulder, elbow, ankle, and wrist.
• Prosthesis Longevity: The typical life span for a joint replacement is between $10$ and $15$ years.
• Statistical Trends (2020):   - Orthopedic surgeons performed approximately $800,000$ total knee arthroplasties (TKAs).   - Surgeons performed approximately $2$ million total hip arthroplasties (THAs).
• Projections and Growth:   - TKA procedures are expected to increase by $143\%$ by the year 2050 compared to 2012 levels.   - THA procedures showed a recorded increase of $24.4\%$ between 2019 and 2020.
• Healthcare Improvement Initiatives: Over the last decade, the reduction of costs and improvements in quality and patient care efficiency have been attributed to the Bundled Payments for Care Improvement (BPCI) program. This program was created by the Centers for Medicare and Medicaid Services (CMS) and other insurance-driven initiatives.

Pathophysiology and Clinical Manifestations

• Primary Indication: Osteoarthritis (OA) is the leading clinical indication for TJA.
• Joint Composition and Degeneration in OA:   - Normal joint cartilage consists of a matrix of proteoglycans and collagen.   - In OA, there is a decrease in proteoglycans, which manage the fluid within the joints, leading to a loss of cartilage strength and functionality.
• Progressive Physical Changes:   - Healthy cartilage appears bluish-white.   - OA-affected cartilage changes from translucent to opaque and eventually to a yellow-brown appearance.   - Deterioration results in the erosion of cartilage and bone, narrowing of the joint space, and the formation of osteophytes (bone spurs).   - Advanced stages involve the development of fissures, pitting, and ulcerations, along with significant thinning of the cartilage.
• Inflammatory Mediators: The inflammatory response produces cytokines (enzymes) such as interleukin-1, which accelerate the deterioration process.
• Clinical Outcomes: The rapid degeneration overcomes the body's compensatory mechanisms, leading to joint destruction, dysfunction, deformity, immobility, pain, muscle spasms, and localized inflammation.
• Surgical Correction: The procedure involves removing damaged bone areas and replacing them with a partial or complete prosthesis.

Interprofessional Medical Management and Diagnosis

• Diagnostic Indicators: TJA is considered based on deformity, tissue destruction, loss of function, stiffness, and pain that limits normal activities. Muscle atrophy is also a common indicator.
• Radiographical Confirmation:   - X-rays: Used to reveal structure and pathology (e.g., narrowed joint space due to loss of cartilage).   - MRI: Used to confirm clinical indices for replacement.
• Initial Conservative Management: Prior to surgery, management focuses on:   - Weight management.   - Activity modification.   - Nonsteroidal therapy (NSAIDs).   - Joint supplements (glucosamine and chondroitin).
• Comprehensive Preoperative Physical Examination Requirements:   1. Range of motion (ROM) assessment and notation of joint contractures.   2. Presence of crepitus or pain (noting patellofemoral, medial, or lateral joint involvement for TKA) during active or passive flexion/extension.   3. Stability and contracture examination of ligaments.   4. Examination of the spine and hip.   5. Neuromuscular examination assessing strength and tone.   6. Gait analysis.   7. Peripheral pulse assessment.   8. Skin assessment.
• Contraindications for Total Knee Arthroplasty (TKA):   - Active infection.   - Neurological conditions affecting neurovascular function in the lower extremity.   - Chronic lower extremity ischemia.   - Skeletal immaturity.
• Contraindications for Total Hip Arthroplasty (THA):   - Preexisting significant medical problems (myocardial infarction, unstable angina, heart failure, severe anemia).   - Skeletal immaturity.   - Tetraplegia.   - Permanent/irreversible muscle weakness without pain.
• NICE Guidelines: The National Institute for Health and Care Excellence states TKA or THA can be considered once self-management, exercise, and analgesia fail to relieve pain during activities of daily living.

Indications for THA/TKA (Clinical Conditions)

• Osteoarthritis: Degenerative wear of articular cartilage and bony cyst formation.
• Rheumatoid Arthritis: Destruction of articular cartilage and bony erosions.
• Previous Injury/Surgery: Abnormal wearing of surfaces due to altered anatomical alignment.
• Childhood Hip Diseases (THA specific): Developmental dysplasia of the hip, Perthes disease, and slipped capital femoral epiphysis (femur/hip misalignment).
• Avascular Necrosis of Femoral Head (THA): Death of the femoral head due to trauma (occurring up to $8$ years post-event) or alcohol-related disease.
• Intracapsular Fractured Neck of Femur (THA): Used when underlying OA is present; preferred over hemiarthroplasty (which replaces the femoral head but does not reline the acetabulum).
• Ankylosing Spondylitis (THA): Bony ankylosis (complete loss of movement) of the hip joint.

Surgical Management and Techniques

• Prosthetic Materials: Most prostheses utilize a cobalt-chrome polished ball and a polyethylene cup or socket (ball and socket design).
• Fixation Approaches:   - Cemented Approach: Uses polymethylmethacrylate cement (glue) to attach the prosthesis to the bone. Used for patients with poor bone quality, older patients, or those with a life expectancy of $20$ years or less.   - Uncemented Approach: Often referred to as cementless, porous, or modular. The prosthetic is coated with hydroxyapatite, which facilitates bone ingrowth into the prosthesis surface. Preferred for younger, active patients to increase joint movement and ease potential future revisions.
• Joint Resurfacing: A newer alternative for younger populations, primarily for hip pathology but also used in knees and shoulders. It involves inserting a metal cup and metal socket while preserving the femoral neck and head.
• Surgical Access:   - Traditional: Standard longitudinal or lateral incisions.   - Minimally Invasive: Incision of approximately $10\,cm$ or less. Reduces tissue trauma and promotes faster healing, though joint visualization is limited.
• Closure and Drains:   - Staples are frequently used for hip surgeries.   - Semipermeable dressings or specialized tape can decrease surgical site infections.   - Drains prevent hematoma and allow for autologous blood donation (transfusion) within the first $6$ hours post-surgery to mitigate blood loss.

Postoperative Complications

• Immediate Concerns: Hypotension, bleeding, and hypovolemia due to surgical blood loss.
• Infection: Prevented by adherence to asepsis, hand washing, proper drain care, monitoring temperature, and tracking WBC count. Prophylactic antibiotics are standard until drain removal.
• Dislocation and Subluxation: Partial or full misalignment of the prosthesis. Signs include asynchronous leg length, abnormal hip rotation, severe pain, and inability to bear weight.
• Heterotrophic Ossification (HO): The formation of extraskeletal bone in muscle or soft tissue that limits ROM. Prevented via prophylactic NSAIDs or single-dose external beam radiation.
• Lethal Complications: Deep vein thrombosis (DVT) and pulmonary embolism (PE).

Nursing Management: Assessments and Actions

• Nursing Diagnoses:   - Acute/chronic pain related to joint destruction.   - Activity intolerance related to mobility limitations.   - Risk for infection related to surgical intervention.
• Preoperative Nursing Tasks:   - Screening: ECG, metabolic profile, coagulation studies, and CBC.   - Assessing anesthesia risk and pain tolerance.
• Postoperative Assessments:   - Vital Signs: Hypertension/tachycardia/tachypnea (perfusion/oxygenation issues); Hypotension/tachycardia (hypovolemia/blood loss).   - Temperature: Monitoring for infection.   - Laboratory assessments: Monitoring Hemoglobin (Hgb) and Hematocrit (Hct) for transfusion needs.   - Neurovascular Assessment: Checking the "5 Ps" (pulses, pallor, paresthesia, paralysis, pulselessness) and pain.   - Wound Drainage: Identifying excessive bloody drainage or thick, purulent discharge.
• Postoperative Nursing Actions:   - Pain Management: Administering medications; using Patient-Controlled Analgesia (PCA) with a $24$ to $48\,hour$ weaning program.   - Wound Care: Maintaining aseptic technique for dressing/drain changes.   - Mobilization: Moving the patient from bed to chair, potentially within $6$ hours post-op.   - DVT Prophylaxis: Using antiembolic/compression stockings, sequential compression devices (SCD), and anticoagulant therapy (up to $4$ to $6$ weeks).   - Positioning: For THA, use abduction pillows to prevent internal rotation and dislocation. Use a turning schedule to prevent decubitus ulcers on bony prominences (e.g., heels).   - TKA Specific: Continuous Passive Motion (CPM) machines may be used to flex/extend the knee, though routine use is not universally supported by evidence.

Patient Education and Discharge Teaching

• Opioid Safety: Caution regarding constipation, drowsiness, and respiratory depression. No alcohol or driving while on opioids.
• Anticoagulation Teaching:   - Low-molecular-weight heparin (LMWH) subcutaneous injections are common at home.   - DVT signs: Pain, warmth, and tenderness at the site.   - Bleeding Precautions: Use electric razors, soft toothbrushes, no flossing, and avoid high-injury activities (e.g., football).
• Dietary Restrictions: If on warfarin, maintain a consistent intake of Vitamin K-rich foods (green vegetables) to avoid interference with drug efficacy.
• Home Environment and Physical Restrictions:   - Exercise $20$ to $30\,minutes$, $2$ to $3$ times daily.   - Maintain hip flexion less than $90^\circ$ for approximately $2\,months$.   - Use raised toilet seats and pull bars in bathrooms.   - Remove scatter rugs and use non-slip footwear.   - Do not cross legs over the midline (prevent hip adduction and venous stasis).   - Use walkers or crutches as directed by physical therapy.

Questions & Discussion

• Connection Check 53.7: Which symptom is an appropriate indication for TJA?   - Answer: A. An inability to perform activities of daily living without pain.   - Incorrect options: B, C, and D reflect desires to return to high-impact or aggressive sports/running, which are not the primary medical indications for TJA.