Table 1

Study characteristics for microfracture studies of the hip

StudyYearStudy designLevel of evidenceCountrySample sizeMale (%)Age (year)Follow-up (months)Follow-up (%)Number of patients completing studySurgeon expertise (as reported in the study manuscript)GRADE
Karthikeyan et al202012Case seriesIVUK208037.2 (SD: NR; range 17–54)17 (SD 11; range 5–47)10020NR4
McDonald et al212014Case–control seriesIIIUSA1710031 (SD: NR; range 23–37)NR10017Expert4
McDonald et al222013Retrospective comparative studyIIIUSA3910030.3 (SD/range: NR)36 (NR)10039Expert4
Philippon et al232008Therapeutic case seriesIVUSA95637.3 (SD: NR; range 21–47)20 (range 10–36)1009NR4
Singh and O'Donnell242010Therapeutic case seriesIVAustralia610022 (SD: NR; range 16–29)22 (range 6–60)1002Expert4
  • GRADE, Grades of Recommendation, Assessment, Development and Evaluation; NR, not reported.