Total knee replacement is commonly associated with early postoperative inflammation, edema, pain, and reduced mobility. This randomized controlled trial will evaluate whether adding a simple circulatory exercise program to standard postoperative rehabilitation reduces early limb edema and inflammatory response after unilateral primary total knee replacement. Participants will be randomized to standard rehabilitation alone or standard rehabilitation plus seated and supine knee-extension exercises with alternating ankle dorsiflexion. The primary endpoint is change in limb edema measured by standardized limb circumference at postoperative day 14.
This is a randomized, parallel-group, assessor-blinded controlled clinical trial. Adults undergoing elective unilateral primary total knee replacement for osteoarthritis will be allocated in a 1:1 ratio to either standard postoperative rehabilitation or standard rehabilitation plus a circulatory exercise protocol. The intervention includes supine leg elevation with ankle pump and knee extension, and seated knee extension with alternating ankle dorsiflexion. The exercise will be performed at approximately 15 cycles per minute, 10 sets of 1 minute, with 60 seconds rest between sets, twice daily for 14 postoperative days. Outcomes include limb circumference, pain, functional mobility, quadriceps strength, inflammatory biomarkers, hemostasis markers, analgesic use, patient satisfaction, and adverse events.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
68
Participants will receive standard postoperative total knee replacement rehabilitation according to the local hospital protocol, including early mobilization, ROM exercises, quadriceps activation, ambulation training, and standard pain/edema management as clinically indicated.
Participants will receive standard postoperative rehabilitation plus a circulatory exercise protocol including supine leg elevation with ankle pump and knee extension, and seated knee extension with alternating ankle dorsiflexion. The exercise will be performed at approximately 15 cycles/minute, 10 sets of 1 minute, 60 seconds rest between sets, twice daily for 14 postoperative days.
Difference in postoperative lower-limb edema between the operated and contralateral limbs measured by standardized limb circumference (cm)
Lower-limb circumference (cm) will be measured bilaterally at standardized anatomical landmarks: 10 cm above the superior border of the patella, at the mid-patellar level, and 20 cm above the superior border of the patella. Measurements will be obtained on both the postoperative limb and the contralateral (sound) limb. Edema will be quantified as the side-to-side difference in circumference and the change from baseline.
Time frame: Baseline/preoperative to postoperative day 14
Postoperative pain intensity measured by the Numeric Rating Scale (NRS, 0-10) at rest and during activity
Pain intensity will be assessed using an 11-point Numeric Rating Scale (NRS), where 0 indicates no pain and 10 indicates the worst imaginable pain. Scores will be recorded at rest and during activity.
Time frame: Baseline/preoperative to postoperative day 14
Functional mobility:
Timed Up and Go (TUG) (go for 3 meter and come back). Record assistance level and gait aids. 3-meter walk test at regular base and fast base.
Time frame: Baseline/preoperative to postoperative day 14
Analgesic consumption
Opioid consumption: record rescue analgesic use
Time frame: Baseline/preoperative to postoperative day 14
Quadriceps strength via handheld dynamometry.
Seated 60 Degrees Knee Flexion Patient position Seated on the edge of the table, with feet not in contact with the ground and knee at 60 degrees of flexion. Contact point Posterior aspect of the ankle attachment, at the hook closest to the achilles tendon. Device orientation Horizontal, linked to the ankle strap at one end and anchored to a fixed surface by the cable strap at the other, posterior to the patient's leg being tested. Position of examiner Adjacent to the patient, in a position to situate the DynaMo and instruct the action. Instruction Pull against the DynaMo as hard as you can. 3, 2, 1 - pull, pull, pull and relax. Attachments Tension links, Carabiners, Ankle strap, Tension strap.
Time frame: Baseline/preoperative to postoperative day 14
Neuromuscular electrical stimulation response
Neuromuscular electrical stimulation response by chattanoga multi-current electrical stimulation.
Time frame: Baseline/preoperative to postoperative day 14
Patient satisfaction with postoperative recovery measured by a 5-point Likert Scale
Patient satisfaction with postoperative recovery will be assessed on postoperative day 14 using a 5-point Likert Scale, where 1 = very dissatisfied, 2 = dissatisfied, 3 = neither satisfied nor dissatisfied, 4 = satisfied, and 5 = very satisfied.
Time frame: postoperative day 14
Serum Interleukin-6 (IL-6)
Interleukin-6 is a pro-inflammatory cytokine and an early mediator of the surgical stress response. Serum IL-6 will be quantified from peripheral venous blood by ELISA. Higher concentrations indicate a greater systemic inflammatory response; IL-6 peaks at approximately 24-48 hours postoperatively. Unit: pg/mL · Reference: \< 7 pg/mL (assay-dependent)
Time frame: Baseline (pre-operative), 24-48 hours post-operative (peak IL-6 window), Baseline/preoperative to postoperative day 14.
Hemostasis or clotting tests
PT (Prothrombin Time) APTT (Activated Partial Thromboplastin Time) D-dimer Fibrinogen
Time frame: Baseline/preoperative to postoperative day 14
Serum C-Reactive Protein (CRP)
C-reactive protein is a hepatically synthesized acute-phase reactant produced in response to IL-6 signaling. Serum CRP will be measured from peripheral venous blood by immunoturbidimetric assay. Higher concentrations indicate greater systemic inflammation; CRP peaks later than IL-6 (\~48-72 hours). Unit: mg/L · Reference: \< 10 mg/L (hs-CRP: \< 1 low, 1-3 moderate, \> 3 high cardiovascular risk)
Time frame: Baseline (preoperative), postoperative 24-48 hours, and postoperative day 14.
Serum Interleukin-10 (IL-10)
Interleukin-10 is an anti-inflammatory cytokine mediating the compensatory anti-inflammatory response to surgical injury. Serum IL-10 will be quantified from peripheral venous blood by ELISA. Higher concentrations indicate a greater compensatory anti-inflammatory response. Unit: pg/mL · Reference: \< 10 pg/mL (often \< 5 pg/mL; assay-dependent)
Time frame: Baseline (preoperative), postoperative 24-48 hours, and postoperative day 14.
Serum Tumor Necrosis Factor-alpha (TNF-α)
Tumor necrosis factor-alpha is a pro-inflammatory cytokine released early in the innate immune response to tissue injury. Serum TNF-α will be quantified from peripheral venous blood by ELISA. Higher concentrations indicate a greater pro-inflammatory response. Unit: pg/mL · Reference: \< 8.1 pg/mL (commonly \< 15-20 pg/mL; assay-dependent)
Time frame: Baseline (preoperative), postoperative 24-48 hours, and postoperative day 14.
Prothrombin Time (PT)
Prothrombin time assesses the extrinsic and common coagulation pathways. PT will be determined on platelet-poor plasma (peripheral venous blood in 3.2% sodium citrate) by an automated clot-based method using a thromboplastin reagent. A prolonged PT indicates impaired extrinsic/common-pathway function. Unit: seconds · Reference: 11-13.5 seconds (INR 0.8-1.1)
Time frame: Baseline (preoperative) and postoperative day 14.
Activated Partial Thromboplastin Time (APTT)
Activated partial thromboplastin time assesses the intrinsic and common coagulation pathways. APTT will be determined on citrated platelet-poor plasma by an automated clot-based method. A prolonged APTT indicates impaired intrinsic/common-pathway function. Unit: seconds · Reference: 25-35 seconds
Time frame: Baseline (preoperative) and postoperative day 14.
D-dimer
D-dimer is a fibrin degradation product reflecting activation of coagulation and fibrinolysis. D-dimer will be measured on citrated plasma by a latex-enhanced immunoturbidimetric assay. Elevated concentrations indicate increased fibrin turnover (hypercoagulable/prothrombotic state or venous thromboembolism). Unit: µg/mL FEU · Reference: \< 0.50 µg/mL FEU (\< 500 ng/mL FEU)
Time frame: Frame: Baseline (preoperative) and postoperative day 14.
Fibrinogen
Fibrinogen (coagulation factor I) is the soluble precursor of fibrin and an acute-phase reactant. Plasma fibrinogen will be measured on citrated plasma by the Clauss clot-based method. Elevated concentrations reflect an acute-phase/inflammatory response; low concentrations may reflect consumption or dilution and a bleeding tendency. Unit: mg/dL · Reference: 200-400 mg/dL (2-4 g/L)
Time frame: Baseline (preoperative) and postoperative day 14.
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