Original Research

Reoperation Rates After Cartilage Restoration Procedures in the Knee: Analysis of a Large US Commercial Database

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STATISTICAL ANALYSIS

Statistical analysis of this study was primarily descriptive to demonstrate the incidence for each code at each time interval. One-way analysis of variance, Chi-square analysis, and contingency tables were used to compare the incidence of each type of procedure throughout the various time intervals. A P-value of < 0.05 was considered statistically significant. Statistical analysis was performed using SPSS v.20 (International Business Machines).

RESULTS

A total of 47,207 cartilage procedures were performed from 2007 to 2011, including 43,576 MFX (92.3%) 640 ACI (1.4%), 386 open OATS (0.82%), 997 arthroscopic OATS (2.11%), 714 open OCA (1.51%), and 894 arthroscopic OCA (1.89%) procedures. A summary of the procedures performed, broken down by age and sex, is provided in Tables 1 and 2. A total of 25,149 male patients (53.3%) underwent surgical procedures compared to 22,058 female patients (46.7%). For each category of procedure (MFX, ACI, OATS, OCA), there was a significantly higher proportion of males than females undergoing surgery (P < .0001 for all). Surgical treatment with MFX was consistently the most frequently performed surgery across all age groups (92.31%), while cell-based therapy with ACI was the least frequently performed procedure across all age ranges (1.36%). Restorative OATS and OCA techniques were performed with the greatest frequency in the 15-year-old to 19-year-old age group, but were not utilized in patients over 64 years of age (Table 2).

Table 2. Breakdown of MFX, ACI, OATS, and OCA Procedures by Age

Age (y)

MFX

ACI

OATS

OCA

10 to 14

572

22

74

47

15 to 19

1984

83

254

235

20 to 24

1468

54

140

144

25 to 29

1787

74

152

176

30 to 34

2824

114

152

204

35 to 39

4237

96

153

210

40 to 44

5441

103

166

217

45 to 49

7126

57

149

180

50 to 54

7004

25

83

140

55 to 59

6410

12

40

40

60 to 64

4409

0

20

15

65 to 69

269

0

0

0

70 to 74

45

0

0

0

Total

43,576

640

1383

1608

Abbreviations: ACI, autologous chondrocyte implantation; MFX, microfracture; OCA, osteochondral allograft; OATS, osteochondral autograft transplantation.

A summary of all reoperation data is provided in Tables 3 to 7 and Figures 1 and 2. The weighted average reoperation rates for all procedures were 5.87% at 90 days, 11.94% at 1 year, and 14.90% at 2 years following the index cartilage surgery. Patients who underwent MFX had reoperation rates of 6.05% at 90 days, 11.80% at 1 year, and 14.65% at 2 years. Patients who underwent ACI had reoperation rates of 4.53% at 90 days, 23.28% at 1 year, and 29.69% at 2 years. Patients who had open and arthroscopic OATS had reoperation rates of 3.122% and 5.12% at 90 days, 6.74% and 8.53% at 1 year, and 7.51% and 10.13% at 2 years, respectively. Patients who underwent open and arthroscopic OCA had reoperation rates of 2.52% and 3.91% at 90 days, 7.14% and 6.60% at 1 year, and 13.59% and 10.85% at 2 years (Table 3). There was a statistically significantly increased risk for reoperation following ACI within all intervals compared to all other surgical techniques (P < .0001); however, MFX had a greater risk factor (P < .0001) for conversion to arthroplasty at 6.70%. There was no significant difference between failure rates (revision OATS/OCA or conversion to arthroplasty) between the restorative treatment options, with 14 failures for OATS (9.52% of reoperations at 2 years) compared to 22 failures for OCA (12.7% of reoperations at 2 years, P = .358). Among the entire cohort of cartilage surgery patients, arthroscopic chondroplasty was the most frequent procedure performed at the time of reoperation at all time points assessed, notably accounting for 33.08% of reoperations 2 years following microfracture, 51.58% of reoperations at 2 years following ACI, 53.06% of reoperations at 2 years following OATS, and 54.07% of reoperations at 2 years following OCA (Figure 3, Tables 4–7).

Table 3. Comparison of Return to OR Following MFX, ACI, OCA, and OATS

Procedure

Total No. of Cases in Study Period

No. of Reoperations at 90 Days

Return to OR Rate at 90 Days

No. of Reoperations at 1 Year

Return to OR Rate at 1 Year

No. of Reoperations at 2 Years

Return to OR Rate at 2 Years

MFX

43,576

2636

6.05%

5142

11.80%

6385

14.65%

ACI

640

29

4.53%

149

23.28%

190

29.69%

Open OATS

386

12

3.12%

26

6.74%

29

7.51%

Arthroscopic OATS

997

51

5.12%

85

8.53%

101

10.13%

Open OCA

714

18

2.52%

51

7.14%

97

13.59%

Arthroscopic OCA

894

161

3.91%

59

6.60%

97

10.85%

Weighted average for all procedures

5.87%

11.94%

14.90%

Abbreviations: ACI, autologous chondrocyte implantation; MFX, microfracture; OCA, osteochondral allograft; OATS, osteochondral autograft transplantation; OR, operating room.

Table 4. Rate of Return to OR Following MFX (n = 43,574)

Procedure

CPT Code

90 Days

1 Year

2 Years

Knee arthroscopy

29870

54

122

162

Knee arthroscopic drainage and lavage

29871

84

102

104

Arthroscopic adhesions débridement

29874

300

468

549

Arthroscopic synovectomy

29875

324

528

611

Major arthroscopic synovectomy

29876

557

926

1087

Knee arthroscopic chondroplasty

29877

1063

1722

2112

Arthroscopic lysis of adhesions

29884

61

129

171

Patellar arthroplasty

27438

0

38

49

Medial or lateral knee arthroplasty

27446

51

242

328

Medial and lateral knee arthroplasty

27447

142

865

1212

Total

2636

5142

6385

Return to OR

6.05%

11.80%

14.65%

Abbreviations: CPT, Current Procedural Terminology; MFX, microfracture; OR, operating room.

Table 5. Rate of Return to OR Following ACI (n = 640)

Procedure

CPT Code

90 Daysa

1 Yeara

2 Yearsa

Revision ACI

27412

29

33

35

Knee arthroscopy

29870

-1

-1

-1

Knee arthroscopic drainage and lavage

29871

-1

-1

-1

Arthroscopic adhesions débridement

29874

0

-1

-1

Arthroscopic synovectomy

29875

-1

-1

-1

Major arthroscopic synovectomy

29876

-1

12

20

Knee arthroscopic chondroplasty

29877

-1

71

98

Arthroscopic lysis of adhesions

29884

-1

33

37

Patellar arthroplasty

27438

0

0

0

Medial or lateral knee arthroplasty

27446

0

-1

-1

Medial and lateral knee arthroplasty

27447

0

-1

-1

Total

29

149

190

Return to OR

4.53%

23.28%

29.69%

aA -1 denotes No. <11 within the PearlDiver database, and exact numbers are not reported due to patient privacy considerations.

Abbreviations: ACI, autologous chondrocyte implantation; CPT, Current Procedural Terminology; OR, operating room.

Table 6. Rate of Return to OR Following OATS (n = 1320)

Procedure

CPT Code

90 Days

1 Year

2 Years

Knee arthroscopy

29870

0

0

0

Knee arthroscopic drainage and lavage

29871

0

0

0

Arthroscopic adhesions débridement

29874

0

12

13

Arthroscopic synovectomy

29875

0

0

14

Major arthroscopic synovectomy

29876

16

25

28

Knee arthroscopic chondroplasty

29877

17

58

78

Arthroscopic lysis of adhesions

29884

0

0

0

Patellar arthroplasty

27438

0

0

0

Medial or lateral knee arthroplasty

27446

0

0

0

Medial and lateral knee arthroplasty

27447

0

0

14

Total

33

95

147

Return to OR

2.50%

7.20%

11.14%

Abbreviations: CPT, Current Procedural Terminology; OATS, osteochondral autograft transplantation; OR, operating room.

Table 7. Rate of Return to OR Following OCA Transplantation (n = 1531)

Procedure

CPT Code

90 Days

1 Year

2 Year

Knee arthroscopy

29870

0

0

0

Knee arthroscopic drainage and lavage

29871

0

0

0

Arthroscopic adhesions débridement

29874

0

15

19

Arthroscopic synovectomy

29875

0

0

0

Major arthroscopic synovectomy

29876

0

20

38

Knee arthroscopic chondroplasty

29877

22

59

93

Arthroscopic lysis of adhesions

29884

0

0

0

Patellar arthroplasty

27438

0

0

0

Medial or lateral knee arthroplasty

27446

0

0

0

Medial and lateral knee arthroplasty

27447

0

0

22

Total

22

94

172

Return to OR

1.44%

6.14%

11.23%

Abbreviations: CPT, Current Procedural Terminology; OCA, osteochondral allograft; OR, operating room.

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