Related Experiment Video
Updated: Oct 31, 2025
Assessment of Bone Fracture Healing Using Micro-Computed Tomography
Published on: December 9, 2022
Microdrilling Demonstrates Superior Patient-Reported Outcomes and Lower Revision Rates Than Traditional
Alexander Beletsky1, Neal B Naveen1, Tracy Tauro1
1Division of Sports Medicine, Midwest Orthopaedics at Rush, Rush University Medical Center, Chicago, Illinois, U.S.A.
Purpose:
The purpose of this study was to compare patient-reported outcomes and revision rates between the standard microfracture awl versus the microdrilling technique.
Methods:
Microfracture patients were queried from a single-institution database between 2001 and 2016. Patient-reported outcome measure data were collected at preoperative and 6- and 12-month time points, inclusive of the International Knee Documentation Committee (IKDC) score, Short Form 12 (SF12) Physical Component Score (PCS) and Mental Component Score, and all Knee Injury and Osteoarthritis Outcome Score (KOOS) subscales. A matching algorithm based on previous procedures, lesion size, and demographic factors created 2 technique-based cohorts. Outcomes including revision rates and both statistically and clinically significant differences (i.e., the minimally clinically important difference [MCID]) between awl and microdrill cohorts were compared using univariate statistics.
Results:
A total of 68 patients (aged 32.0 ± 13.1 years, 48.5% female, body mass index 26.7 ± 5.3 kg/m2), with 34 patients in each group, were included after the match. At 6 months, the microdrilling group demonstrated significantly greater levels of improvement than the awl group on the IKDC, SF12 PCS, and KOOS Pain, Symptom, Sport, and Quality of Life (P < .04), although differences at 1 year were only maintained on the SF12 PCS instrument (P < .001). With respect to MCID achievement, the microdrilling group demonstrated greater achievement rates at 6 months on the IKDC, KOOS Pain, and KOOS Sport (P < .04). The awl group demonstrated a higher rate of revision surgery (P = .02) within 3 years of follow-up and a greater likelihood to require multiple subsequent procedures (41.1% vs 17.6%, P = .03).
Conclusions:
Microdrilling demonstrated superior outcomes relative to traditional microfracture awl techniques with respect to patient-reported outcomes at 6 months and revision rates within 3 years of follow-up. In addition, clinically meaningful differences were evident at 6 months in the microdrilling group.
Level Of Evidence:
Level III, retrospective comparative study.
Insights
Microdrilling shows better patient outcomes and fewer revisions than standard microfracture awl techniques for knee injuries. This surgical approach offers improved pain relief and function, reducing the need for further procedures.
Area of Science:
- Orthopedic surgery
- Regenerative medicine
Background:
- Articular cartilage defects are common knee injuries.
- Microfracture is a standard surgical technique for cartilage repair.
- Alternative techniques aim to improve patient outcomes.
Purpose of the Study:
- To compare patient-reported outcomes and revision rates between standard microfracture awl and microdrilling techniques.
- To evaluate the efficacy of microdrilling versus awl in cartilage repair.
Main Methods:
- Retrospective comparative study of 68 patients (34 per group) undergoing microfracture.
- Patient-reported outcomes collected preoperatively and at 6 and 12 months.
- Utilized International Knee Documentation Committee (IKDC), SF-12, and Knee Injury and Osteoarthritis Outcome Score (KOOS) measures.
- Matched cohorts based on prior procedures, lesion size, and demographics.
- Compared revision rates and minimally clinically important difference (MCID) achievement.
Main Results:
- Microdrilling group showed significantly improved IKDC, SF-12 PCS, and KOOS scores at 6 months (P < .04).
- Improvements were maintained for SF-12 PCS at 1 year (P < .001).
- Microdrilling demonstrated higher MCID achievement at 6 months for IKDC, KOOS Pain, and KOOS Sport (P < .04).
- The awl group had higher revision surgery rates within 3 years (P = .02) and required more subsequent procedures (41.1% vs 17.6%, P = .03).
Conclusions:
- Microdrilling offers superior patient-reported outcomes at 6 months compared to the standard microfracture awl technique.
- Microdrilling is associated with lower revision rates within 3 years post-surgery.
- Clinically meaningful improvements were observed earlier with the microdrilling technique.
