Please assess the completion status of the following clinical trial:

Trial Title: Dexmedetomidine as Adjuvant for FNB in TKA

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: TRIPLE
- Phase: None
- Number of Arms: 3.0

Eligibility Criteria:
Inclusion Criteria:~* ASA I-II~* scheduled for total knee arthroplasty~Exclusion Criteria:~* refusal to participate in this study~* unicompartmental knee arthroplasty~* BMI \> 35 kg/m2~* congnitive or phychiatric history~* refusal of general anesthesia~* contraindication to laryngeal mask airway insertion~* contraindication to peripheral nerve block (localized infections, sepsis, coagulopathy, bleeding diathesis or preexisting lower extremity neurological abnormality)~* allergy to the drugs used

- Gender: ALL
- Minimum Age: 50 Years
- Maximum Age: 80 Years
- Healthy Volunteers: f

Study Arms:
- H group (Type: EXPERIMENTAL): H group stands for High concentration group. A single bolous of 20 ml ropivacaine 0.2% in ultrasound-guided femoral nerve block (FNB) before the TKA surgery, followed by continuous femoral nerve block (CFNB) using ropivacaine 0.2% (5 ml/h) for postoperative analgesia which started right after surgery. After surgery, all patients received multimodal analgesia of 200mg celecoxib every 12 hours. All subjects received anothother intravenous patient-controlled analgesia pump (IV-PCA pump), which included 50 mg morphine in 50 ml saline: bolus 2 mg; lock out time, 15 minutes.
- L group (Type: EXPERIMENTAL): L group stands for low concentration group. A single bolous of 20 ml ropivacaine 0.1% in ultrasound-guided femoral nerve block (FNB) before the TKA surgery, followed by continuous femoral nerve block (CFNB) using ropivacaine 0.1% (5 ml/h) for postoperative analgesia which started right after surgery. All subjects received anothother intravenous patient-controlled analgesia pump (IV-PCA pump), which included 50 mg morphine in 50 ml saline: bolus 2 mg; lock out time, 15 minutes.
- LD group (Type: EXPERIMENTAL): LD group stands for low concentration group with dexmedetomidine. A single bolous of 20 ml ropivacaine 0.1% plus 2 μg/kg dexmedetomidine in ultrasound-guided femoral nerve block (FNB) before the TKA surgery, followed by continuous femoral nerve block (CFNB) using ropivacaine 0.1% (5 ml/h) for postoperative analgesia which started right after surgery. All subjects received anothother intravenous patient-controlled analgesia pump (IV-PCA pump), which included 50 mg morphine in 50 ml saline: bolus 2 mg; lock out time, 15 minutes.

Based on this trial design, predict the completion outcome and termination type (if applicable).