The post-operative pain generated by prosthetic knee replacement surgery is known to be moderate to severe during two or three days following surgery. The most popular analgesic technique after prosthetic knee replacement surgery remains the femoral block (FB), whether in single injection or continuous infusion. In major knee surgery, FBs provide better analgesia compared to systemic morphine and FBs provide the same analgesia that obtained with epidural analgesia but with fewer associated adverse effects. Although FBs provide excellent post-operative analgesia after total knee prosthesis, they also provide a significant quadricepsia weakness that increases the risk of severe falls and complications, and hinders the rapid rehabilitation process. For these reasons, alternative analgesic techniques have emerged in recent years. To avoid the quadricipital motor block generated by FBs, some authors proposed the administration of local anesthetics in the adductor channel, also known as the Hunter channel, in order to produce a pure sensory block. With the development of ultrasound, the adductor channel is easily visualized in the middle of the thigh. This allows the adductor channel block (ACB) to be realized with a high success rate. ACB appears to decrease postoperative pain and morphine consumption. It also significantly improves the ability of patients to walk around after Total Knee Arthroplasty (TKA) surgery. With the same goal of quadricipital savings, the use of the analgesic technique by periarticular infiltration of local anesthetics (ILA) has spread in recent years, due to the fact that an analgesic technique of simple realization and without apparent danger, and this despite limited evidence of its effectiveness. The Croix-Rousse Hospital is a university hospital in Lyon with a highly developed orthopedic surgery center, producing approximately 550 TKA per year. During the year 2016, approximately half were benefited from post-operative analgesia management by ACB, and the other half by the implementation of the ILA. To date few studies have been interested in comparing these two analgesic techniques in knee prosthesis surgery.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
98
The block at the adductor channel will be realized under echo guidance, before the spinal anesthesia, by puncture at the upper 1/3 of the thigh. It will be used echogenic needle adapted to the morphotype of each patient, of varying length from 50mm to 100mm. A single injection of 20mL of ROPIVACAINE 2mg / ml, the efficacy of which should be checked before spinal anesthesia is performed by a cold test. Knee analgesia will be supplemented by per-operative infiltration of 50mL of ROPIVACAINE 2mg / ml at the posterior capsule, once the surfaces joints prepared to accommodate the prosthesis and by two placebo infiltrations of 50mL each of physiological saline in the medial and lateral ligaments and in the edges of the incision.
A placebo injection to the adductor channel of 20 mL of physiological serum will be performed in the pre-induction room before surgery, according to the same procedures as the patients of the ACB group. During the surgical procedure, patients in the ILA group will receive a total dose of 300mg of ROPIVACAINE 2mg / ml in the form of 3 periarticular injections. The first injection of 50mL of ROPIVACAINE 2mg / ml will be made once the articular surfaces are prepared to receive the prosthesis, at the level of the posterior capsule. The second injection of 50mL of ROPIVACAINE 2mg / ml will be performed once the total knee prosthesis is installed, in the medial and lateral ligaments. Finally, the last injection will also include 50mL of ROPIVACAINE 2mg / ml and will be made in the edges of the incision at the time of closure.
Croix Rousse Hospital
Lyon, France
the cumulative consumption of MORPHINE
cumulative dose of morphine (miligrams). The administration of morphine will be done using a self-controlled analgesic pump (PCA). It will be made available to the patient when he leaves the block. The PCA allows the patient to adapt his consumption of morphine to his needs in analgesics. A nurse regularly reports the amount of morphine that the patient has administered.
Time frame: during the first 48 hours following the surgical incision
Pain at rest
Postoperative pain will be assessed by a visual scale, graded from 0 to 10, where 0 is a total absence of pain and 10 is the maximum pain. Pain at rest will be measured by the paramedical team
Time frame: Resting pain will be measured every 4 hours in the first 24 hours, then every 8 hours between 24 and 72 hours
pain in movement
Postoperative pain will be assessed by a visual scale, graded from 0 to 10, where 0 is a total absence of pain and 10 is the maximum pain. The movement pain will be assessed daily by the team of physiotherapists for orthostatism, walking, and maximum flexion of the operated knee.
Time frame: at day 3
quality of the analgesia offered by the ACB
the consumption of MORPHINE will be analyzed from different angles in order to evaluate the quality of the analgesia offered by the ACB. It will therefore be observed in the ACB group, the time between injection to the adductor channel and the first dose requested on the PCA.
Time frame: within 48 hours after the injection to the adductor channel
quality of the analgesia offered by the ILA
the consumption of MORPHINE will be analyzed from different angles in order to evaluate the quality of the analgesia offered by the ILA. It will be observed the delay between the end of surgery and the use of a first dose of MORPHINE on PCA.
Time frame: within 48 hours after the end of surgery
quality of the analgesia
the curve of consumption of morphine over time from H0 (surgical incision time) to H48 will be established for the 2 arms
Time frame: within 48 hours after the surgical incision time
Functional capabilities and rehabilitation
The evaluation of the quality and the precocity of the postoperative rehabilitation of the patients will be carried out by the daily measurement of the CAS score (Cumulated Ambulation Score). This score is a validated tool in orthopedic surgery to evaluate daily the recovery of the basic mobility of the patients until return to an autonomy allowing their return home.
Time frame: at day 3
Duration of hospitalization
The total duration of hospitalization will be reported after the patient has left, whether it is a return home, or a transfer to a rehabilitation center
Time frame: at day 3
Patient satisfaction
overall satisfaction and satisfaction with pain management will be assessed for each patient using a visual scale where 0 is a completely dissatisfied patient and 10 is a fully satisfied patient
Time frame: at day 3
Secondary complications due to adductor channel block
All complications related to this gesture should be reported in the case report form : failure (specify the reason), vagal malaise, suspicion of intravenous injection and suspicion of intravascular injection.
Time frame: Day 0 : At the time of the ACB in the pre-induction room
Complications secondary to analgesic medications and surgery
Adverse effects associated with the use of MORPHINE, the administration of local anesthetics and related to surgery will be reported in the case report form.
Time frame: at day 3
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.