Total Knee Replacement






























General Information


Case no.


17.A Total Knee Replacement


Authors


Melissa Brown, MSPAS, PA-C


Julie M. Skrzat, PT, DPT, PhD, Board Certified Clinical Specialist in Cardiovascular & Pulmonary Physical Therapy


Diagnosis


Periprosthetic infection of total knee replacement (TKR)


Setting


Medical-surgical floor in an acute care hospital


Learner expectations


☑ Initial evaluation


☐ Re-evaluation


☐ Treatment session


Learner objectives




  1. Explain the pathophysiology of the patient’s diagnosis.



  2. Recognition and integration of medical precautions/orders into physical therapy plan of care.



  3. Identify signs and symptoms of disease progression.
































Medical


Chief complaint


Right knee pain and fever


History of present illness


The patient is a 73-year-old man with a past medical history of a right TKR 3 months ago. He presented to the emergency department yesterday with sudden-onset right knee pain, swelling, and fever of 101.2 °F. The pain started upon awakening 2 days ago and has progressed to a now constant 10/10 sharp, aching pain. He noted swelling and redness of the knee, along with an inability to bear weight on the right leg for the past 24 hours. He also endorsed severe pain with movement of his knee in all planes of motion. Initial evaluation in the emergency department revealed a leukocytosis of 16.7 × 109/L, and erythrocyte sedimentation rate (ESR) of 85 mm/h, and C-reactive protein (CRP) of 115 mg/L. Arthrocentesis was performed, which yielded 25 mL of turbid yellow fluid. He has been started on intravenous (IV) vancomycin and cefepime.


Past medical history


Hypertension, hyperlipidemia, type 2 diabetes mellitus


Past surgical history


Right knee replacement at age 72 years without complications.


Appendectomy at age 24 years without complications.


Allergies


None


Medications


Lisinopril, Atorvastatin, Metformin


Precautions/orders


Activity as tolerated
Non–weight-bearing (NWB) on right lower extremity (RLE).























Social history


Home setup




  • Resides in a two-story home with his wife.



  • One step without handrail to enter.



  • No bathroom on the main level.



  • Bedroom and bathroom are located on the second floor.



  • Flight of stairs + one handrail to the second floor.


Occupation




  • Police officer, retired 7 years ago.


Prior level of function




  • Independent with functional mobility and activities of daily living (ADLs).



  • Very active; gym 3 × week participated in cardio and strength training.



  • (+) driver


Recreational activities




  • Fishing and hiking


































Vital signs


Hospital day 0:
emergency department


Hospital day 1: ward


Blood pressure (mmHg)


122/74


132/68


Heart rate (beats/min)


108


104


Respiratory rate (breaths/min)


24


21


Pulse oximetry on room air (SpO2)


99%


98%


Temperature (°F)


101.8 (oral)


100.8 (oral)


























Imaging/diagnostic test


Hospital day 0: emergency department


Hospital day 1:
ward


Right knee X-ray


1. Well-fixed and cemented components of TKR with good alignment


Fig. 17.1


1. Not reordered.


Synovial fluid analysis and culture


1. Viscosity: low


2. White blood cell (WBC) count: 113,000


3. Polymorphonuclear cell count: 86%


4. Gram stain: positive


5. Crystals: negative


1. Culture: positive for gram + cocci in clusters.


Blood cultures


1. No growth to date.


1. No growth to date.






















Medical management


Hospital day 0: emergency department


Hospital day 1: ward


Medications


1. Vancomycin IV


2. Cefepime IV


3. Lisinopril


4. Atorvastatin


5. Insulin glargine


6. Insulin lispro


7. Heparin SQ


8. Oxycodone PO prn


9. Morphine IV prn


10. Colace PO prn


11. Acetaminophen prn


12. Ketorolac prn


Continued per medical plan of care.


Procedures


1. Right knee arthrocentesis


1. Arthroscopic irrigation and debridement of right knee.



No Image Available!




Fig. 17.1 Radiographs of the knee demonstrate changes of total knee arthroplasty. A joint effusion is present, with surrounding soft-tissue swelling. Bone loss and lucency outline portions of the femoral and tibial components (black arrows). Soft-tissue gas (white arrows) is seen along the medial joint line. (Adapted from Garcia G, ed. Case 167. A 51-year-old man presents with redness and swelling of the knee. In: RadCases: Musculoskeletal Radiology. 1st ed. New York, NY: Thieme; 2010.)





















































































































Lab


Reference range


Hospital day 0: emergency department


Hospital day 1: ward


Complete blood count


WBC


5.0–10.0 × 109/L


16.7


17.8


Hemoglobin


14.0–17.4 g/dL


14.1


14.6


Hematocrit


42–52%


42.5


43.2


Red blood cell


4.5–5.5 million/mm3


4.6


4.8


Platelet


140,000–400,000/μL


399


401


Metabolic Panel


Calcium


8.6–10.3 mg/dL


9.2


9.4


Chloride


98–108 mEq/L


106


104


Magnesium


1.2–1.9 mEq/L


1.7


1.7


Phosphate


2.3–4.1 mg/dL


3.1


3.3


Potassium


3.7–5.1 mEq/L


4.7


4.8


Sodium


134–142 mEq/L


140


138


Blood urea nitrogen


7–20 mg/dL


18


17


Creatinine


0.7–1.3 mg/dL


1.02


1.12


Anion gap


3–10 mEq/L


8


10


CO2


22–26 mEq/L


24


22


Other


Glucose


60–110 mg/dL


168


187


CRP


< 3.0


115


Not reordered


Uric acid


3.4–7.0 mg/dL


3.6


International normalized ratio


0.8–1.2


0.9


Lactate


< 2 mmol


1.8












Pause points


Based on the above information, what are the priorities?




  • Diagnostic tests and measures?



  • Outcome measures?



  • Treatment interventions?


























































































































Hospital Day 1, Ward: Physical Therapy Examination


Subjective


“I am anxious to move, but want to get back to my routine.”


Objective


Vital signs


Pre-treatment


Post-treatment


Supine


Sitting


Standing


Sitting


Blood pressure (mmHg)


130/80


128/80


132/82


128/78


Heart rate (beats/min)


104


107


110


110


Respiratory rate (breaths/min)


17


20


22


18


Pulse oximetry on room air (SpO2)


96%


99%


97%


98%


Pain


10/10, right knee


8/10, right knee


General




  • Patient supine in bed, awake but fatigued, R knee immobilizer present.



  • Lines notable for telemetry, hep-lock IV.


Cardiovascular and pulmonary




  • Auscultation: normal rate. No murmurs, rubs, or gallops. Lungs clear to auscultation.



  • Rhythm strip


Fig. 17.2




  • Pulses: 2 + bilateral dorsalis pedis and posterior tibialis.


Musculoskeletal


Inspection




  • R knee erythematous, swollen, and warm to palpation. Three arthroscopic incisions well-approximated without discharge.


Range of motion (ROM)




  • Bilateral upper extremity (BUE): within functional range.



  • R hip and ankle: within functional range.



  • R knee: not tested due to knee immobilizer.



  • Left lower extremity (LLE): within functional range.


Strength




  • B shoulder flexion: 5/5



  • B elbow flexion: 5/5



  • B wrist extension: 5/5



  • B hip flexion: 4/5



  • R knee: not tested due to knee immobilizer.



  • L knee extension: 4/5



  • R ankle dorsiflexion: 3/5 (resistance not applied due to WB status).



  • L ankle dorsiflexion: 4/5


Aerobic




  • Reported 14/20 on Rate of Perceived Exertion (RPE) Scale during transfers.


Flexibility




  • Not tested


Neurological


Balance




  • Static sitting, unsupported: close supervision



  • Dynamic sitting, unsupported: contact guard assistant



  • Static standing: contact guard assistance with rolling walker.



  • Dynamic standing: minimal assistance with rolling walker.


Cognition




  • Alert and oriented × 4


Coordination




  • Finger to nose: intact bilaterally


Cranial nerves




  • II–XII: intact


Reflexes




  • L patellar: 2 + 



  • Achilles: 1 + bilaterally


Sensation




  • Intact to light touch.


Tone




  • Normal throughout BUEs and bilateral lower extremities (BLEs).


Other




  • N/A


Functional status


Bed mobility




  • Rolling right: supervision with head of the bed (HOB) flat, no bed rails.



  • Rolling left: minimal assistance to move right lower extremity (RLE), with HOB flat, no bedrails.



  • Supine to sit: supervision at trunk, minimal assistance for RLE; HOB flat.


Transfers




  • Sit to/from stand: minimal assistance with rolling walker.


Ambulation




  • Ambulated 20 feet with minimal assistance and rolling walker; demonstrated 3-point, step-to gait pattern.



  • Gait deviations notable for increased WB through BUE with bilateral scapular elevation.



  • Verbal cues provided throughout for maintenance of WB precautions.


Stairs




  • Not tested


Other




  • Activity Measure for Post-Acute Care (AM-PAC) score: 18/24.



No Image Available!




Fig. 17.2 Rhythm strip.

























Assessment


☑ Physical therapist’s


Assessment left blank for learner to develop


Goals


Patient’s


“I want to get back to doing what I did before.”


Short term


1.


Goals left blank for learner to develop


2.


Long term


1.


Goals left blank for learner to develop


2.














Plan


☑ Physical therapist’s


Will continue to see patient three to five times a week for strength and endurance interventions to maximize functional mobility and safety.






























Bloom’s Taxonomy Level


Case 17.A Questions


Create


1. Synthesizing the medical data and physical examination findings, develop an appropriate physical therapy assessment of the patient.


2. Develop two short-term physical therapy goals, including an appropriate timeframe.


3. Develop two long-term physical therapy goals, including an appropriate timeframe.


Evaluate


4. If the patient is to remain NWB on RLE at hospital discharge, how could the physical therapist educate the patient on ascending the stairs to get to his bathroom?


Analyze


5. What is the rate and rhythm of the rhythm strip on the patient’s day of admission? Identify three reasons why the patient may have this rate and rhythm.


Apply


6. Design and implement two interventions to decrease the risk of developing a deep vein thrombosis.


Understand


7. Discuss classification of periprosthetic infection and at what timeframe is a patient at most risk for developing a periprosthetic infection.


8. Why was a uric acid level and crystals ordered.


9. Interpret the patient’s AM-PAC score.


10. Why is the patient’s blood glucose elevated.


Remember


11. What do WBCs and CRP measure? Why are they elevated.






























Bloom’s Taxonomy Level


Case 17.A Answers


Create


1. The patient is a 73-year-old man who presents with sudden onset of right knee pain, swelling, and fever. Medical workup included arthrocentesis, which revealed septic arthritis. Physical therapy evaluation showed decreased RLE strength, specifically right quadriceps, and decreased aerobic capacity as shown by sinus tachycardia and 14/20 RPE on Borg Scale during transfers. As a result of these physical findings and medical precautions of NWB, he required use of rolling walker and minimal assistance to complete all functional mobility. He would benefit from continued physical therapy to improve above deficits through ROM, strengthening, endurance, and functional training to maximize functional mobility and safety. Will continue to follow thrice a week and progress as tolerated.


2. Short-term goals:




  • Patient will perform supine to/from sit independently with HOB flat within 4 days to be independent at home.



  • Patient will be independent with home exercise program for BLE muscle strengthening and endurance within 4 days to optimize functional mobility.


3. Long-term goals:




  • Patient will ambulate 100 feet with rolling walker and supervision, demonstrating reciprocal gait pattern, within 7 days to be able to mobilize around home.



  • Patient will ascend/descend a flight of stairs + one rail with supervision within 7 days to get in and out of home.


Evaluate


4. If the patient were to remain NWB on RLE at hospital discharge, the patient could demonstrate a hop-to pattern with LLE on the steps while placing bilateral hands on the single handrail. Assuming the patient is not ascending the flight of stairs multiple times a day, the patient’s wife could assist by placing the rolling walker on the second floor to use after successful stair negotiation. The patient and his wife could also have a chair set up for the patient to rest, since hopping on one leg is more metabolically demanding, especially considering physiological changes that occur with aging and hospitalization.


Analyze


5. The patient’s rhythm strip reads a rate of 110 beats/min and a rhythm of sinus tachycardia. Explanations for this patient’s rate and rhythm include pain (10/10), anxiety (as reported by subjective), and/or in response to metabolic demand.


Apply


6. Two interventions to decrease the risk of developing a deep vein thrombosis are ankle pumps (in any position) or active mobility. Other interventions may include leg exercises, proper hydration, mechanism compression, and assessment regarding the need for referral to a physician. By having the patient perform active movements, facilitation of venous return is occurring.


Understand


7. Timeframe of periprosthetic infection is often divided into three categories: early, delayed, and late. Early is defined as infection that occurs within the first 3 months after implantation. Delayed is the period between 3 and 24 months, and late is more than 2 years after implantation. Patients are at greatest risk during the early timeframe.


8. Serum uric acid level and evaluation of arthrocentesis fluid for crystals evaluate the etiology of the presenting complaint. Gout and pseudogout present with similar symptoms to an acute septic arthritis, which include a painful, erythematous, hot, swollen joint. Gout results from an accumulation of monosodium urate crystals within a joint space. Gout is often diagnosed with elevated serum uric acid levels and negatively birefringent crystals in arthrocentesis fluid. Pseudogout results from the accumulation of calcium pyrophosphate dehydrate crystals within the joint space. Pseudogout will have positive birefringent crystals on arthrocentesis evaluation. Proper evaluation determines proper diagnosis, which guides appropriate treatment.


9. AM-PAC “6-clicks” is a functional assessment instrument used in the acute care setting. The AM-PAC measures three domains: basic mobility, daily activities, and applied cognition. Physical therapists use the basic mobility domain, which includes the following components: rolling, sitting down on and standing up from a chair, moving from lying on back to sitting on the side of the bed, moving to/from bed to chair, walking in the hospital room, and climbing three to five stairs with a railing. It is ranked on a 4-point scale with 1 being dependent and 4 being independent. The patient’s AM-PAC score is 18/24 because he scored a 3 on all functional components, which is based on his functional performance during his initial evaluation.


10. The body will respond to a stressful experience, such as a significant infectious process, by triggering several hormones in order to maintain energy stores. Blood glucose will be elevated due to elevations in counter-regulatory hormones. Increased secretion of catecholamines and glucagon initially raise glucose where increased secretion of cortisol and growth hormone leads to prolonged hyperglycemia in stress states.


Remember


11. The patient’s WBCs are elevated, which is also known as leukocytosis. The increase in WBCs is likely due to an infection, as found in the patient’s arthrocentesis performed on hospital day 1. The infection supports the patient’s clinical manifestations of fever and inflammation and pain at the knee joint. CRP is a protein made by the liver. It is an inflammatory biomarker. It is elevated as a result of the bacterial infection found in the patient’s arthrocentesis.
















Key points


1. It is important for the physical therapist to synthesize all medical data (i.e., imaging, lab values, etc.) to understand how the patient’s pathophysiology can affect functional status and to assess for red flags at every session.


2. It is important to identify medical precautions/orders prior to treating the patient, as they have the ability to change physical therapy management and potentially discharge planning.


3. Considering the length of time physical therapists spend with patients during evaluations and subsequent treatment sessions, they are in prime positions to monitor for signs and symptoms that could be indicative of disease progression, both within a session and over time.





























General Information


Case no.


17.B


Authors


Melissa Brown, MSPAS, PA-C


Julie M. Skrzat, PT, DPT, PhD, Board Certified Clinical Specialist in Cardiovascular & Pulmonary Physical Therapy


Diagnosis


History of total knee replacement (TKR) with periprosthetic infection, endocarditis, and sepsis


Setting


Medical intensive care unit (ICU) in an acute care hospital


Learner expectations


☑ Initial evaluation


☐ Re-evaluation


☐ Treatment session


Learner objectives




  1. Explain the pathophysiology of acute respiratory distress syndrome.



  2. Relate the pathophysiology and progression of pathology to clinical manifestations and activity/participation limitations seen in physical therapy practice.



  3. Differentiate how physical therapy plans of care differ between patients who are intubated and patients who are not intubated.



  4. Develop an understanding of ICU acquired weakness and the ICU triad and how it can impact physical therapy’s plan of care.
































Medical


Chief complaint


Endocarditis and sepsis


History of present illness


The patient is a 73-year-old man with a past medical history of a right TKR 3 months ago. He presented to the emergency department 3 days ago with sudden-onset right knee pain, swelling, and fever of 101.2 °F. Arthrocentesis was performed and he was started on intravenous (IV) vancomycin and cefepime. The following day, he was taken to the operating room (OR) for arthroscopic irrigation and debridement. Final cultures grew methicillin-resistant Staphylococcus aureus from the right knee as well as blood cultures. On hospital day 2, he developed chest pain, shortness of breath, worsening fever, and a new-onset heart murmur. A transthoracic echocardiogram was performed and confirmed the finding of a vegetation on the tricuspid valve. A diagnosis of acute bacterial endocarditis was made. On hospital day 3, he was transferred to the ICU after becoming hypotensive and tachypneic. He was intubated on hospital day 4.


Past medical history


Hypertension, hyperlipidemia, and type 2 diabetes mellitus


Past surgical history


Arthroscopic irrigation and debridement 2 days ago.


Right knee replacement at age 72 without complications initially.


Appendectomy at age 24 without complications.


Allergies


None


Home Medications


Lisinopril, Atorvastatin, Metformin


Precautions/orders


Contact precautions
Non–weight-bearing (NWB) on right lower extremity (RLE).


Bedrest on hospital day 3, ICU day 1.
Activity as tolerated on hospital day 5, ICU day 3.























Social history


Home setup




  • Resides in a two-story home with his wife.



  • One step without handrail to enter.



  • No bathroom on the main level.



  • Bedroom and bathroom are located on the second floor.



  • Flight of stairs + one handrail to the second floor.


Occupation




  • Police officer, retired 7 years ago.


Prior level of function




  • Independent with functional mobility and activities of daily living (ADLs).



  • Very active; gym thrice a week, participated in cardio and strength training.



  • (+) driver


Recreational activities




  • Fishing and hiking

Only gold members can continue reading. Log In or Register to continue

Stay updated, free articles. Join our Telegram channel

Dec 11, 2021 | Posted by in MANUAL THERAPIST | Comments Off on Total Knee Replacement

Full access? Get Clinical Tree

Get Clinical Tree app for offline access