Please assess the completion status of the following clinical trial:

Trial Title: Intrathecal Morphine in Knee Arthroplasty

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:~* Patients for elective total knee arthroplasty~Exclusion Criteria:~* No contraindication to spinal~* No allergy to morphine, rescue analgesia or anti-emesis treatment.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- 1 (Type: EXPERIMENTAL): patients in this group got 100mcg of intrathecal morphine.
- 2 (Type: EXPERIMENTAL): patients in this group got 200 mcg intrathecal morphine
- 3 (Type: EXPERIMENTAL): patients in this group given 300 mcg intrathecal morphine.

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