Please assess the completion status of the following clinical trial:

Trial Title: Spinal Anesthesia in Patients With Poorly-palpable Surface Landmarks

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: CASE_CONTROL
- Primary Purpose: None
- Time Perspective: PROSPECTIVE
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~* Patients presenting for elective total hip or knee replacement under spinal anesthesia who have poorly palpable or impalpable spinous processes~* BMI ≥ 35 kgm-2~Exclusion Criteria:~* Inability or refusal to provide informed consent,~* Bleeding diathesis,~* Allergy to local anesthetics~* Contra-indication to spinal anesthesia

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

Study Arms:
- Landmark Technique (Type: None): Control group
- Ultrasound guided technique (Type: None): Neuroaxial block using Ultrasound guidance

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