Here is the design of a clinical trial:

Official Title: Ultrasound-guided Lumbar Plexus Combined with Quadratus Lumborum Block Using Single-needle Technique with Shamrock Method for Hip Arthroplasty

Included conditions:
- Hip Osteoarthritis
- Anesthesia, Local
- Hip Fractures
- Osteonecrosis of Femoral Head

Study Armgroups:
- {'label': 'L3 LPB technique (P group)', 'type': 'ACTIVE_COMPARATOR', 'description': 'ultrasound-guided shamrock approach L3 lumbar plexus block with single-needle technique', 'interventionNames': ['Procedure: L3 LPB', 'Drug: 0.375%ropivacaine 25 ml (Raropin)', 'Procedure: General anesthesia with tracheal intubation']}
- {'label': 'T12 combined with L3 and L4 LPB technique (TP group)', 'type': 'ACTIVE_COMPARATOR', 'description': 'ultrasound-guided posterior approach thoracic 12 combined with L3 and L4 lumbar plexus block with mulitple-needle technique', 'interventionNames': ['Procedure: L3 LPB', 'Procedure: L4 LPB', 'Procedure: T12 block', 'Drug: 0.375%ropivacaine 40 ml (Raropin)', 'Procedure: General anesthesia with tracheal intubation']}
- {'label': 'L3 LPB combined with QLB (LPQLB-SNT, PQ group)', 'type': 'EXPERIMENTAL', 'description': 'ultrasound-guided shamrock approach L3 lumbar plexus block combined with quadratus lumborum block with single-needle technique', 'interventionNames': ['Procedure: L3 LPB', 'Procedure: L3 QLB', 'Drug: 0.375%ropivacaine 40 ml (Raropin)', 'Procedure: General anesthesia with tracheal intubation']}

Interventions:
- {'type': 'PROCEDURE', 'name': 'L3 LPB', 'description': 'ultrasound-guided L3 lumbar plexus block', 'armGroupLabels': ['L3 LPB combined with QLB (LPQLB-SNT, PQ group)', 'L3 LPB technique (P group)', 'T12 combined with L3 and L4 LPB technique (TP group)']}
- {'type': 'PROCEDURE', 'name': 'L4 LPB', 'description': 'ultrasound-guided L4 lumbar plexus block', 'armGroupLabels': ['T12 combined with L3 and L4 LPB technique (TP group)']}
- {'type': 'PROCEDURE', 'name': 'T12 block', 'description': 'ultrasound-guided thoracic 12th segment nerve block', 'armGroupLabels': ['T12 combined with L3 and L4 LPB technique (TP group)']}
- {'type': 'PROCEDURE', 'name': 'L3 QLB', 'description': 'ultrasound-guided quadratus lumborum block at L3 level', 'armGroupLabels': ['L3 LPB combined with QLB (LPQLB-SNT, PQ group)']}
- {'type': 'DRUG', 'name': '0.375%ropivacaine 25 ml (Raropin)', 'description': '0.375%ropivacaine (Raropin) 25ml will be given', 'armGroupLabels': ['L3 LPB technique (P group)']}
- {'type': 'DRUG', 'name': '0.375%ropivacaine 40 ml (Raropin)', 'description': '0.375%ropivacaine (Raropin) 40ml will be given', 'armGroupLabels': ['L3 LPB combined with QLB (LPQLB-SNT, PQ group)', 'T12 combined with L3 and L4 LPB technique (TP group)']}
- {'type': 'PROCEDURE', 'name': 'General anesthesia with tracheal intubation', 'description': 'General anesthesia with tracheal intubation will be induced with sufentanil, propofol, vecuronium for every patient before the operation and maintained with sevoflurane during the operation', 'armGroupLabels': ['L3 LPB combined with QLB (LPQLB-SNT, PQ group)', 'L3 LPB technique (P group)', 'T12 combined with L3 and L4 LPB technique (TP group)']}

Primary Outcomes:
- {'measure': 'sensory block assessment', 'description': 'The sensory block will be assessed by cold alcohol swab and pinprick at lateral, anterior and medial areas of thigh and postero-lateral area of gluteus using a 0 to 2 point scale. 0= no block, patients can feel cold; 1= analgesic block, patient can feel touch but not cold; 2= anesthetic block, patient cannot feel cold or touch.', 'timeFrame': '30 minutes after nerve block procedure'}

Please estimate the sample size based on the assumption: 
Chi-square test, 90% power, two-tailed 5% significance level, including possible dropouts.
Sample size calculation
        Due to lack of referencedata in previous published study, calculation of the sample size was based on our pilot study with 24 subjects. We estimated the success rates of the three groups to be 20%, 70%, and 65%, respectively. Using chi-square test, sample size of 28 for each group will achieve 90% power to detect the difference with a two-tailed 5% significance level. The total sample size will be 84 including the possible dropouts.