An observational study in Adductor Canal Block and Postop Analgesia for Knee, sponsored by University of Iowa. Completed at 1 site in United States. Open to participants aged 18 Years to 75 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2017-12-07.
Sponsored by University of Iowa · Observational
There has been dispute about the location at which the adductor canal block should be performed (3-6). Two Common approaches have been used for ultrasound guided adductor canal blocks with the 'point of entry' being:
We want to determine ultrasound anatomy in healthy volunteers by:
This will allow us to determine which is the best site for performing an adductor canal block
It is important to answer the primary question because of the variable length of the adductor canal and we would like to determine the optimal position to perform the adductor canal block.
The adductor canal typically contains the saphenous nerve, nerve to vastus medialis muscle and on occasion, the obturator nerve (1). The roof of adductor canal is the vasto-adductor membrane and its length is reported to range from 5.5 cm to 15 cm with a mean of 7.6 cm2 and would suggest the length of the AC is variable. We would like to determine the length of the AC with the use of ultrasound. The AC would be determined to begin at the apex of the femoral triangle and end just proximal to the adductor hiatus. The length and location of the AC would be important to characterize as the volume of local anesthetic used and associated quadriceps weakness could be of significance in a shorter AC.
There has been dispute about the location at which the adductor canal block should be performed (3-6). Point A has been disputed to be within the femoral triangle and would therefore be a femoral nerve block as suggested by a small body of evidence (4-5). Clinically, it is unclear if there is a difference between quadriceps muscle weakness between the two approaches although it could be hypothesized placing a block at point A would lead to more quadriceps muscle weakness. With information gathered from this study, we plan to perform a clinical study by performing the nerve blocks at these two points with different volumes of local anesthetic and compare the amount analgesia and motor weakness between the two different approaches.
60 Volunteers (30 male and 30 female) aged between 18 to 75 years with a body mass index of 18 to 35 kg/m2 will be included in this study. Volunteers with previous surgery or deformities of the lower extremity will be excluded from the study
This is an observational study without a control group. Several reference points will be marked by anatomical landmarks and/or ultrasound:
A. the anterior superior iliac spine (landmark); B. the base of the patella (landmark); C. apex of femoral triangle (ultrasound); and D. distal most portion of adductor canal (Point B described earlier; ultrasound).
The primary outcome measure we are looking at is the distance between Point A and Point B.
We also plan to measure the distance (in centimeters) from:
University of Iowa is the lead sponsor of 276 studies on the registry; 35 are open to participants now.
Of its 44 completed or terminated interventional studies of FDA-regulated products, 39 (89%) have results posted.
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We aim to recruit volunteers who principally are healthcare employees at UIHC who mainly work in the Main Operating Rooms and Ambulatory Surgical Center Operating Rooms, mainly due to ease of access to ultrasonographic equipment. The subjects include anesthesiologists, certified registered nurse anesthetists, residents, interns, nurses, volunteers, technicians, administrative staff and other members of staff working in these areas.
Exclusion Criteria:
Several reference points will be marked by anatomical landmarks and/or ultrasound: the anterior superior iliac spine; base of patella; apex of the femoral triangle A measuring tape will be used to measure the anterior superior iliac spine (landmark); the base of the patella (landmark); apex of femoral triangle (ultrasound); and distal most portion of adductor canal (Point B described earlier; ultrasound). We will then measure the ASIS to: 1) base of patella; 2) apex of femoral triangle; and 3) Point B. We will repeat the same procedure on the opposite leg. Once complete, the volunteer will be allowed to dress and leave. The procedure should take approximately 10-20 minutes for each volunteer. The following things will be recorded for each subject: * Age * Gender * Weight * Height * BMI * Distance of ASIS to base of patella * Distance of Point A to base of patella * Distance of Point B to base of patella * Distance of apex of femoral triangle to base of patella
Measurement 1
The distance in cm between Point A and Point B
Time frame: One time assessment done during Ultrasound scanning of the lower extremity
Measurement 2
The distance in cm between Point A and base of patella
Time frame: One time assessment done during Ultrasound scanning of the lower extremity
Measurement 3
The distance in cm between Point B and base of patella
Time frame: One time assessment done during Ultrasound scanning of the lower extremity
Measurement 4
The distance in cm between Apex of femoral triangle and base of patella
Time frame: One time assessment done during Ultrasound scanning of the lower extremity
Plan to share: No
This study is completed, as verified in Nov 2017. You cannot join it, but the record below documents what was studied.
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