Minimal Versus Conventional Exposure in Unicompartmental Knee Arthroplasty

Region Örebro County40 enrolled

Overview

The purpose of this study is to determine whether Minimal Invasive Surgery results in less postoperative pain and better mobilization than conventional technique in Unicompartmental Knee Arthroplasty, provided that both groups receive Local Infiltration Analgesia.

Postoperative pain is often moderate to severe following unicompartmental knee arthroplasty. In order to reduce postoperative pain and improve mobilization the minimal invasive technique was developed. After a 8-10 cm skin incision, a medial parapatellar capsule incision in made. The rectus tendon or the vastus medialis are not incised and the patella is not everted. In recent years The Local Infiltration Analgesia (LIA) technique has been developed to reduce postoperative pain. With this LIA-technique, a long-acting local anesthetic (ropivacaine), a nonsteroidal anti-inflammatory drug (ketorolac), and epinephrine are infiltrated intraoperatively and via an intraarticular catheter postoperatively. The aim of this study is to investigate if Minimal Invasive Surgery results in less postoperative pain and better mobilization than conventional technique in Unicompartmental Knee Arthroplasty, provided that both groups receive Local Infiltration Analgesia.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Enrollment

Conditions

Knee Osteoarthritis

Interventions

Minimal Invasive SurgeryPROCEDURE

After a 8-10 cm skin incision, a medial parapatellar capsule incision is made. The vastus medialis muscle or the rectus tendon are not incised, nor is the patella everted. The patella is merely pushed slightly aside when the bone cuts are made and the prostheses are cemented in place. Local Infiltration Analgesia is used.

Conventional exposurePROCEDURE

After a 15-20 cm midline skin incision is made, a medial parapatellar capsule incision is made. The incision is carried up through the insertion of the vastus medialis and into the rectus tendon. The patella is everted. The bone cuts are made and the prostheses are cemented in place. Local Infiltration Analgesia is used.

Eligibility

Sex: ALLMin age: 20 YearsMax age: 80 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Patients scheduled for unicompartmental knee arthroplasty * Aged 20-80 yrs * ASA physical status I-III and mobility indicating normal postoperative mobilization Exclusion Criteria: * Known allergy or intolerance to local anesthetics, ASA or NSAID * Serious liver-, heart- or renal decease * Rheumatoid arthritis * Chronic pain or bleeding disorder

Locations (1)

Dept. of Orthopedic Surgery

Örebro, Örebro County, Sweden

RECRUITING

Outcomes

Primary Outcomes

Time to fulfilling discharge criteria

Time frame: 0-2 weeks

Secondary Outcomes

Pain intensity

Time frame: 0-3 months

Hospital stay

Time frame: 0-2 weeks

Morphine consumption

Time frame: 0-48 hours

Knee function

Time frame: 0-3 months

Patient satisfaction

Time frame: 0-3 months

Data from ClinicalTrials.gov

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