Common Causes of Unplanned Returns After Total Knee Replacement
- Wound drainage concerns in the first 72 hours after total knee arthroplasty are a leading cause of unplanned post-operative contacts. Patients who have not been instructed on the expected appearance, volume, and duration of surgical wound drainage will contact the practice or visit the emergency department at the first sign of any moisture on the dressing. Instructions should describe the color and quantity of drainage expected in the first 48 hours after TKA, specify the threshold at which drainage requires evaluation (soaking through two dressings within one hour, drainage that becomes cloudy or malodorous, or drainage persisting beyond five days), and provide clear guidance on dressing change technique.
- DVT and pulmonary embolism are recognized risks after total knee arthroplasty and generate a portion of unplanned emergency contacts. The American Academy of Orthopaedic Surgeons (AAOS) clinical practice guidelines on VTE prophylaxis after TKA support pharmacologic prophylaxis for most patients. Discharge instructions must identify the specific prophylaxis agent prescribed, dose, duration, and administration schedule. Instructions should also describe the warning signs of DVT (calf pain or tightness, leg swelling, skin redness or warmth) and pulmonary embolism (chest pain, shortness of breath, rapid heart rate) and specify that pulmonary embolism symptoms require 911 activation, not a call to the office.
- Physical therapy non-participation in the first days after total knee replacement generates callbacks from patients who are unwilling or unable to perform prescribed exercises due to pain or uncertainty about what is expected. Discharge instructions should name the specific exercises prescribed, describe the frequency and number of repetitions, set a threshold for acceptable pain during exercise (using a numeric pain scale), and state what the patient should do if they are unable to complete exercises (call the practice before stopping the home program).
- Excessive swelling and heat in the operative knee are expected findings after TKA that generate avoidable contacts when patients have no reference for what is normal. Instructions should describe the expected degree of swelling and warmth at 24 hours, 72 hours, and one week; specify ice application frequency and duration; define the elevation position required; and identify the specific findings that indicate a complication versus expected postoperative changes (fever above 101.5 degrees Fahrenheit, sudden increase in knee redness or warmth after initial improvement, drainage that changes character).
- Medication-related questions after total knee arthroplasty are among the most frequent after-hours call drivers. Multimodal pain management protocols that include acetaminophen, NSAIDs, opioids, and adjuncts require written instructions that specify each medication by name, dose, timing, maximum daily dose, and the sequence in which the medications should be used (scheduled versus as-needed). Patients who do not understand the intended sequence will either under-use scheduled medications or overuse as-needed opioids, both of which generate callbacks.
Discharge Instruction Content for Total Knee Arthroplasty
- Total knee arthroplasty discharge instructions must include: the weight-bearing status and assistive device required; home physical therapy exercise program with exercise names, frequencies, and repetitions; wound care steps with dressing change schedule; ice application protocol (frequency, duration, and barrier protection to prevent skin injury); DVT prophylaxis medication name, dose, duration, and administration schedule; all pain medications with names, doses, schedules, and weaning guidance; the follow-up appointment date and purpose; and the specific symptoms requiring emergency evaluation versus calling the practice during business hours.
- Walker and cane progression instructions after total knee arthroplasty should specify the criteria for transitioning from walker to cane (ability to walk without significant trunk lean, clearance from the surgeon or physical therapist). Instructions that tell patients to advance as tolerated without providing benchmarks generate questions about whether they are progressing appropriately and whether they are allowed to try without supervision.
- Stair-climbing instructions must be provided for all patients who live in multi-story homes or who must navigate stairs to enter their residence. Instructions should describe the step pattern for ascending and descending (lead with the non-operative leg going up, lead with the operative leg going down) and the handrail requirements. Patients who receive no stair instruction and attempt stairs on their own are at elevated fall risk.
- Activity restrictions after total knee arthroplasty that are not explicitly written are rarely retained. Instructions should specify the prohibited activities for each recovery phase: no driving until cleared by the surgeon (minimum while on opioid medications), no kneeling on the operative knee until the incision is fully healed, no high-impact activities during the implant integration period. Instructions should also specify which activities are encouraged: walking increasing distances daily, ice and elevation, home exercise program participation.
- The follow-up appointment plan should be included in discharge instructions with the specific date, time, and location; the provider the patient will see; and the expected activities at the visit (wound check, staple or suture removal, range of motion assessment, imaging if indicated). Patients who do not have a clear follow-up plan in writing have higher rates of missed appointments.
CJR Model Documentation and CMS Quality Reporting
- The CMS Comprehensive Care for Joint Replacement (CJR) model holds participating hospitals financially accountable for the cost and quality of the 90-day episode of care following a qualifying joint replacement. Under CJR, a hospital readmission or an unplanned emergency department visit within 90 days increases the episode cost and affects the facility's reconciliation payment. Discharge documentation quality directly affects CJR episode performance.
- CJR quality measures include the Hospital Consumer Assessment of Healthcare Providers and Systems (HCAHPS) survey, which contains questions about discharge information comprehensibility and whether the patient received written instructions about post-discharge care. Patients who report not receiving written instructions or not understanding their instructions contribute to lower HCAHPS scores, which affect the quality adjustment multiplier in CJR reconciliation.
- Participating CJR hospitals are expected to engage in care coordination activities that include patient education, early post-discharge follow-up, and tracking of 90-day outcomes. Documentation of the specific discharge instructions provided, the patient's demonstrated understanding, and follow-up contact attempts is relevant to audit inquiries if a readmission is disputed or a reconciliation is reviewed.
- MIPS Quality Measures 020 and 021 (perioperative antibiotic timing and selection) apply to knee arthroplasty cases. Documentation of prophylactic antibiotic administration, agent selection, and rationale for non-first-line agents is required for each case reported under these measures. First-generation cephalosporins are the recommended prophylaxis agent per ASHP, IDSA, SIS, and SHEA consensus guidelines for clean orthopedic procedures.
QAPI Tracking for Knee Replacement Outcomes
- Orthopedic practices should track unplanned post-operative contacts after total knee arthroplasty as a formal QAPI indicator. Categorizing calls by content (wound concerns, DVT prophylaxis questions, pain management, physical therapy questions, swelling concerns) and tracking them by surgeon and discharge instruction version allows practices to identify the most common instruction gaps and target revisions to the areas generating the most contacts.
- Unplanned ED visits and hospital readmissions within 90 days of total knee arthroplasty should be tracked separately from planned hospital encounters. Visit and admission reasons should be categorized to distinguish avoidable contacts (wound drainage questions, pain management questions, instruction clarification) from genuine complications (VTE, surgical site infection, prosthetic joint infection, hardware failure). The proportion of avoidable contacts represents a quality improvement target.
- Surgical site infection surveillance after total knee arthroplasty should use a 90-day tracking window consistent with NHSN definitions for arthroplasty procedures. This requires a mechanism for receiving post-discharge infection reports from patients who present to other providers. Practices should request records when a patient reports a post-operative infection at an outside facility and enter the findings into the NHSN tracking record.
- Fall events in the early post-operative period after knee replacement are a patient safety indicator with significant clinical and medicolegal implications. Falls that result in fracture, hardware damage, or wound disruption typically lead to urgent returns. Tracking the timing, mechanism, and outcome of post-operative falls allows practices to identify whether pre-discharge ambulation training, assistive device instruction, or home modification recommendations reduce fall frequency.