Original Research

A Systematic Review of 21 Tibial Tubercle Osteotomy Studies and More Than 1000 Knees: Indications, Clinical Outcomes, Complications, and Reoperations

Am J Orthop. 2017 November;46(6):E396-E407

Bryan M. Saltzman, MD

Allison Rao, MD

Brandon J. Erickson, MD

Gregory L. Cvetanovich, MD

David Levy, MD

Bernard R. Bach, Jr, MD

Brian J. Cole, MD, MBA

Following PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines, we searched the literature for tibial tubercle osteotomy (TTO) studies and systematically reviewed them for indications, clinical outcomes, complications, and reoperations. Therapeutic clinical studies that reported TTO indications, operative findings, and outcomes were included. Quality of each study was assessed with the modified Coleman methodology score (MCMS). Twenty-one studies (976 patients, 1055 knees) were included in the analysis.

Better quality studies had a mean (SD) MCMS of 19.8 (8.2), well under the 55-point cutoff. TTO was most commonly performed for isolated patellar instability in the presence of knee pain. The other pathologies addressed were patellofemoral osteoarthritis, patella alta, and patella baja with or without knee pain. TTO significantly improved knee pain and clinical outcome scores, though 21% of patients (>1 in 5) required reoperation for hardware removal. Young women with prior surgery on the affected knee were the primary patient population.

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References

1. Blond L, Hansen L. Patellofemoral pain syndrome in athletes: a 5.7- year retrospective follow-up study of 250 athletes. Acta Orthop Belg. 1998;64(4):393-400.

2. Fairbank JC, Pynsent PB, van Poortvliet JA, Phillips H. Mechanical factors in the incidence of knee pain in adolescents and young adults. J Bone Joint Surg Br. 1984;66(5):685-693.

3. Mehta VM, Inoue M, Nomura E, Fithian DC. An algorithm guiding the evaluation and treatment of acute primary patellar dislocations. Sports Med Arthrosc. 2007;15(2):78-81.

4. Erickson BJ, Mascarenhas R, Sayegh ET, et al. Does operative treatment of first-time patellar dislocations lead to increased patellofemoral stability? A systematic review of overlapping meta-analyses. Arthroscopy. 2015;31(6):1207-1215.

5. Hauser E. Total tendon transplant for slipping patella. Surg Gynecol Obstet. 1938;66:199-214.

6. Sherman SL, Erickson BJ, Cvetanovich GL, et al. Tibial tuberosity osteotomy: indications, techniques, and outcomes. Am J Sports Med. 2014;42(8):2006-2017.

7. Hall MJ, Mandalia VI. Tibial tubercle osteotomy for patello-femoral joint disorders. Knee Surg Sports Traumatol Arthrosc. 2016;24(3):855-861.

8. Grawe B, Stein BS. Tibial tubercle osteotomy: indication and techniques. J Knee Surg. 2015;28(4):279-284.

9. Fulkerson JP. Disorders of the Patellofemoral Joint. 4th ed. Baltimore, MD: Williams & Wilkins; 1997.

10. Koh JL, Stewart C. Patellar instability. Clin Sports Med. 2014;33(3):461-476.

11. Coleman BD, Khan KM, Maffulli N, Cook JL, Wark JD. Studies of surgical outcome after patellar tendinopathy: clinical significance of methodological deficiencies and guidelines for future studies. Victorian Institute of Sport Tendon Study Group. Scand J Med Sci Sports. 2000;10(1):2-11.

12. Al-Sayyad MJ, Cameron JC. Functional outcome after tibial tubercle transfer for the painful patella alta. Clin Orthop Rel Res. 2002;(396):152-162.

13. Atkinson HD, Bailey CA, Anand S, Johal P, Oakeshott RD. Tibial tubercle advancement osteotomy with bone allograft for patellofemoral arthritis: a retrospective cohort study of 50 knees. Arch Orthop Trauma Surg. 2012;132(4):437-445.

14. Caton JH, Dejour D. Tibial tubercle osteotomy in patello-femoral instability and in patellar height abnormality. Int Orthop. 2010;34(2):305-309.

15. Dantas P, Nunes C, Moreira J, Amaral LB. Antero-medialisation of the tibial tubercle for patellar instability. Int Orthop. 2005;29(6):390-391.

16. Drexler M, Dwyer T, Marmor M, Sternheim A, Cameron HU, Cameron JC. The treatment of acquired patella baja with proximalize the tibial tuberosity. Knee Surg Sports Traumatol Arthrosc. 2013;21(11):2578-2583.

17. Eager MR, Bader DA, Kelly JD 4th, Moyer RA. Delayed fracture of the tibia following anteromedialization osteotomy of the tibial tubercle: a report of 5 cases. Am J Sports Med. 2004;32(4):1041-1048.

18. Ebinger TP, Boezaart A, Albright JP. Modifications of the Fulkerson osteotomy: a pilot study assessment of a novel technique of dynamic intraoperative determination of the adequacy of tubercle transfer. Iowa Orthop J. 2007;27:61-64.

19. Fulkerson JP, Becker GJ, Meaney JA, Miranda M, Folcik MA. Anteromedial tibial tubercle transfer without bone graft. Am J Sports Med. 1990;18(5):490-498.

20. Heatley FW, Allen PR, Patrick JH. Tibial tubercle advancement for anterior knee pain: a temporary or permanent solution. Clin Orthop Relat Res. 1986;(208):216-225.

21. Hirsh DM, Reddy DK. Experience with Maquet anterior tibial tubercle advancement for patellofemoral arthralgia. Clin Orthop Relat Res. 1980;(148):136-139.

22. Jack CM, Rajaratnam SS, Khan HO, Keast-Butler O, Butler-Manuel PA, Heatley FW. The modified tibial tubercle osteotomy for anterior knee pain due to chondromalacia patellae in adults: a five-year prospective study. Bone Joint Res. 2012;1(8):167-173.

23. Koëter S, Diks MJ, Anderson PG, Wymenga AB. A modified tibial tubercle osteotomy for patellar maltracking: results at two years. J Bone Joint Surg Br. 2007;89(2):180-185.

24. Luhmann SJ, Fuhrhop S, O’Donnell JC, Gordon JE. Tibial fractures after tibial tubercle osteotomies for patellar instability: a comparison of three osteotomy configurations. J Child Orthop. 2011;5(1):19-26.

25. Naranja RJ Jr, Reilly PJ, Kuhlman JR, Haut E, Torg JS. Long-term evaluation of the Elmslie-Trillat-Maquet procedure for patellofemoral dysfunction. Am J Sports Med. 1996;24(6):779-784.

26. Naveed MA, Ackroyd CE, Porteous AJ. Long-term (ten- to 15-year) outcome of arthroscopically assisted Elmslie-Trillat tibial tubercle osteotomy. Bone Joint J. 2013;95(4):478-485.

27. Paulos L, Swanson SC, Stoddard GJ, Barber-Westin S. Surgical correction of limb malalignment for instability of the patella: a comparison of 2 techniques. Am J Sports Med. 2009;37(7):1288-1300.

28. Pidoriano AJ, Weinstein RN, Buuck DA, Fulkerson JP. Correlation of patellar articular lesions with results from anteromedial tibial tubercle transfer. Am J Sports Med. 1997;25(4):533-537.

29. Shen HC, Chao KH, Huang GS, Pan RY, Lee CH. Combined proximal and distal realignment procedures to treat the habitual dislocation of the patella in adults. Am J Sports Med. 2007;35(12):2101-2108.

30. Stetson WB, Friedman MJ, Fulkerson JP, Cheng M, Buuck D. Fracture of the proximal tibia with immediate weightbearing after a Fulkerson osteotomy. Am J Sports Med. 1997;25(4):570-574.

31. Valenzuela L, Nemtala F, Orrego M, et al. Treatment of patellofemoral chondropathy with the Bandi tibial tubercle osteotomy: more than 10 years follow-up. Knee. 2011;18(2):94-97.

32. Wang CJ, Wong T, Ko JY, Siu KK. Triple positioning of tibial tubercle osteotomy for patellofemoral disorders. Knee. 2014;21(1):133-137.

33. Luyckx T, Didden K, Vandenneucker H, Labey L, Innocenti B, Bellemans J. Is there a biomechanical explanation for anterior knee pain in patients with patella alta? Influence of patellar height on patellofemoral contact force, contact area and contact pressure. J Bone Joint Surg Br. 2009;91(3):344-350.

34. Mayer C, Magnussen RA, Servien E, et al. Patellar tendon tenodesis in association with tibial tubercle distalization for the treatment of episodic patellar dislocation with patella alta. Am J Sports Med. 2012;40(2):346-351.

35. Maquet P. Advancement of the tibial tuberosity. Clin Orthop Relat Res. 1976;(115):225-230.

36. Lewallen DG, Riegger CL, Myers ER, Hayes WC. Effects of retinacular release and tibial tubercle elevation in patellofemoral degenerative joint disease. J Orthop Res. 1990;8(6):856-862.

37. Aglietti P, Insall JN, Cerulli G. Patellar pain and incongruence, I: measurements of incongruence. Clin Orthop Relat Res. 1983;(176):217-224.

Take-Home Points

TTO specifics depend on anatomy, radiographic alignment characteristics, and presence of chondral defects.
Osteotomy and movement of the tibial tubercle can include anteriorization, anteromedialization, proximalization, medialization, or distalization.
TTO was most commonly performed for isolated patellar instability in the presence of knee pain.
Young women with prior surgery on the affected knee made up the primary patient population for this procedure.
While TTO significantly improves knee pain and clinical outcome scores, >1 in 5 patients required reoperation for hardware removal.

Patellofemoral pain and patellofemoral instability are common orthopedic problems. Studies have found that 30% of patients 13 to 19 years old have patellofemoral pain and that 29 in 100,000 patients 10 to 17 years old have patellofemoral instability. ^1-3 The reported rate of recurrence after nonoperative management of patellofemoral instability is 33%. ⁴ Tibial tubercle osteotomy (TTO), first described by Hauser ⁵ in 1938, is an effective treatment option for many patellofemoral disorders.

TTO indications include patellofemoral maltracking or malalignment, patellar instability, patellofemoral arthritis, and focal patellofemoral chondral defects. ⁶ With TTO, the goal is to move the tibial tubercle in a direction that will either improve patellar tracking or offload the medial or lateral patellar facet to improve pain and function. ^7,8 This action typically involves anterior, medial, lateral, or distal translation of the tibial tubercle, as posteriorization can lead to increased contact forces across the patellofemoral joint, resulting in accelerated patellofemoral wear and increased pain. ⁹

We systematically reviewed the TTO literature to identify indications, clinical outcomes, complications, and reoperations. We hypothesized that the overall complication rate and the overall reoperation rate would both be <10%.

Clinical Evaluation of Patellofemoral Pathology

Patients with patellofemoral pain often report anterior knee pain, which typically begins gradually and is often activity related. Several symptoms may be present: pain with prolonged sitting with knees bent; pain on rising from a seated position; pain or crepitus with climbing stairs; and pain during repetitive activity such as running, squatting, or jumping. Location, duration, and onset of symptoms should be elicited. Patellofemoral instability can be described as dislocation events or subluxation events; number of events, mechanisms of injury, and resulting need for reduction should be documented. As age, sex, body mass index, and physical fitness are relevant to risk of recurrence, the physician should ask about general ligamentous laxity, other joint dislocations, and prior surgical intervention. Swelling or mechanical symptoms may indicate patellofemoral joint pathology. ^6,10

Physical examination of patients with patellofemoral pathology begins with assessment for overall limb alignment (including resting position of patella and corresponding quadriceps angle [Q-angle]), generalized ligamentous laxity (including hypermobile joints, evaluated with Brighton criteria), overall peri-knee muscle tone and strength, effusion, and gait pattern.

Figure 1.

Knee and hip range of motion should be documented. Apprehension ( Figure 1 ) and lack of a firm endpoint on placement of a lateralizing moment on the patella suggest prior dislocation or subluxation. Patella and surrounding anatomy must be palpated for location and severity of tenderness. Finally, patellar tilt, height, mobility, and dynamic tracking, including J-sign, are pertinent to evaluation. The J-sign for patellar tracking is positive when the patella deviates laterally as the knee moves from flexion into extension. Examination of the asymptomatic contralateral side is essential for comparison. Plain radiographs are important first-line imaging. Computed tomography or magnetic resonance imaging can be used to measure tibial tubercle-trochlear groove (TT-TG) distance. TT-TG distance of >15 mm is abnormal, and >20 mm indicates TTO is required. Advanced imaging is additionally valuable in assessing for chondral injury or trochlear dysplasia. ^6,10

Common TTO Procedures

TTO specifics depend on anatomy, radiographic alignment characteristics, and presence of chondral defects. Essentially, the patella is translated to offload the affected areas. Osteotomy and movement of the tibial tubercle can include anteriorization, anteromedialization, proximalization, medialization, or distalization.

Figure 2.

Lateralization or anterolateralization may be pertinent to revision if an osteotomy direction results in overcorrection of tuberosity position. Anteriorization ( Figures 2A-2C ) does not have a role in patellofemoral instability, but can unload areas of excessive patellar chondral force concentration at the central or proximal patella by increasing the angle between the patellar and quadriceps tendons and thereby decreasing the joint reaction forces.

Figure 3.

Straight medialization ( Figures 3A, 3B ) offloads lateral patellar chondral injury and may decrease lateral instability.

Figure 4.

Distalization ( Figures 4A-4C ) can correct for patella alta in the setting of patellar instability and allows earlier engagement of the patella in the trochlea to increase osseous restraint to lateral translation. ⁶

Figure 5.

Anteromedialization ( Figure 5 ) is indicated in patients with a normal proximal and medial patellar chondral surface and a laterally positioned patella leading to alteration of the contact area in the trochlear groove and resulting pain, lateral patellar or trochlear chondral disease, or instability. Osteotomy angle can provide varied medialization through consistent slope and anteriorization. For example, a 60° slope osteotomy provides 9 mm of medialization with 15 mm of anteriorization. ⁶The procedure, similar to the additional TTO operations, begins with a lateral parapatellar incision that is extended distal to the tibial tubercle and anterior over the crest. The soft tissues around the tubercle are released to allow mobilization.

Figure 6.

Variable osteotomy jigs allow for different slope cuts for more medialization or anteriorization, based on preoperative findings. The osteotomy cuts are started with a thin oscillating blade ( Figure 6 ) and finished with an osteotome.

Figure 7.

The tubercle fragment ( Figure 7 ) is shifted and provisionally fixed with a Kirschner wire before being drilled and fixated with two 4.5-mm countersunk cortical screws ( Figures 8, 9A-9B ).

Figure 8.

Figure 9.

Locally harvested corticocancellous bone can help anteriorize the tubercle block. Osteotomy specifics allow for corresponding anatomical translations of the TTO to address the preoperative pathology.

Methods

Search Strategy and Data Collection

We searched the PubMed (Medline) database for all English-language TTO studies published between database inception and April 9, 2015. After PROSPERO registration, and following PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines, we used the algorithm ( “tibial” AND “tubercle” AND “osteotomy”) NOT ( “total” AND “knee” AND “arthroplasty” ) to search the literature. Inclusion criteria included level I-IV studies on TTO indications, operative findings, and outcomes. Exclusion criteria were non-English studies, unpublished studies, level V evidence, letters to the editor, editorials, review articles, basic science articles, technique articles, revision procedures, articles without clinical outcomes, and conference proceeding abstracts. Studies that reported on duplicate populations were included only with the most recent available clinical outcomes. All abstracts were reviewed in duplicate by Dr. Levy and Dr. Rao and assessed with respect to the criteria outlined. Then the same authors performed full-text reviews of eligible studies before including these studies in the systematic review.

Table 1.

They also manually checked the references in study articles to identify additional studies for possible inclusion in the review. A standardized form created by the authors at the start of the review was used to extract data ( Table 1 ).

Assessment of Study Quality

The quality of each TTO study in the review was assessed with a modified Coleman methodology score (MCMS), which ranges from 0 to 100. A study with an MCMS of <55 points is considered a poor-quality study. ¹¹

Data Synthesis and Statistical Analysis

Given that most of the included studies were level IV, a formal meta-analysis was not indicated. In this article, we report categorical data as frequencies with percentages and preoperative and postoperative continuous data as means (SDs), with weighted means based on number of patients in each study, where applicable. We used 2-tailed t tests for comparisons made with the free Meta-Analysis Calculator and Grapher (http://www.healthstrategy.com/meta/meta.pl ). Statistical significance was set at P < .05.

Results

Search Results and Included Studies

Figure 10.

Table 2.

Twenty-one studies (976 patients, 1055 knees) were included in the analysis ( Figure 10; Table 2 ).^12-32 These studies were published between 1986 and 2013. There were 18 level IV studies (85.7%), 3 level III studies (14%), and no level I or II studies. Better quality studies had a mean (SD) MCMS of 19.8 (8.2), well under the 55-point cutoff. In the 16 studies that reported sex, women accounted for 69% of the population. Weighted mean (SD) age was 27.68 (10.45) years (range, 12-77 years) (18 studies reporting).

Only 1 study provided preoperative body mass index (27 kg/m2). There were 55.35% of patients who had prior surgery on the affected knee (6 studies reporting).

Preoperative Data

Preoperative pathologic, radiographic, and clinical scoring data were scarcely reported and nonuniform (Table 2). The most common pathology treated with TTO was isolated patellofemoral instability (746/1055 patients, 70.7%). The other pathologies addressed were isolated patellofemoral osteoarthritis/chondromalacia patellae (143, 13.6%), patellofemoral instability with patella alta (61, 5.8%), patellofemoral instability with patellofemoral osteoarthritis (45, 4.3%), isolated patella baja (41, 3.9%), isolated patella alta (19, 1.8%), and patellofemoral osteoarthritis with patella baja (2, 0.2%). Five hundred fifty-five patients (53%) had a preoperative complaint that included knee pain, and 809 (77%) reported preoperative patellar laxity or instability events. The imaging data reported were Q-angle, Insall-Salvati ratio, Caton-Deschamps index, Blackburne-Peel ratio, Outerbridge osteoarthritis grade, and TT-TG distance. Preoperative clinical scoring data most prominently included a visual analog scale (VAS) score of 70.50 (4 studies reporting), a Lysholm score of 59.19 (5 studies), and a Kujala score of 41.16 (4 studies). Shelbourne-Trumper and Cox-Insall scores were reported in 1 and 2 studies, respectively.

Operative Characteristics

Of the 21 studies, 12 reported only on patients who had TTO performed in isolation; in the other 9 studies, cohorts included patients who underwent concurrent procedures. In the 17 studies (856 patients) that listed numbers of patients who underwent specific concomitant procedures, 715 patients (83.5%) underwent an isolated TTO procedure, and the other 141 (16.5%) underwent either concomitant lateral femoral trochleoplasty, arthroscopic drilling of chondral lesions, patellar shaving chondroplasty, partial meniscectomy or concomitant meniscal repair, intra-articular loose body removal, and/or lateral release with or without medial plication.

Table 3.

Twenty studies reported specifics on the intraoperative direction of the tibial bone block osteotomy ( Table 3 ). In most cases (50.8%), anteromedial translation (anteromedialization) was performed; anteriorization was performed in 18.7% of cases, medialization in 9.6%, medial and distal translation in 7.2%, a “triple” (anteriorization, medialization, proximalization) in 6%, isolated distalization in 2.8%, and proximalization in 1.6%. The remaining 2.8% of procedure specifics were not identified.

Postoperative Data

Table 4A.

Table 4B.

Table 4C.

Table 4 lists the overall cohort’s postoperative radiographic, clinical outcome scoring, and complications data. Fifteen studies reported follow-up of >2 years. As with the preoperative data, radiographic and clinical scoring data were relatively nonuniform; some numeric data, however, should be highlighted. Statistical analysis allowed for comparison of preoperative-postoperative VAS, Lysholm, and Kujala scores, each of which was significantly higher after surgery ( P < .001). Seven studies reported an overall clinical outcome rating, with the cumulative majority of patients reporting good (37.9%) or excellent (39.2%) results.

There was a cumulative total of 79 complications (8% of cohort): 17 recurrent patellar dislocations (1.9%), 4 recurrent patellar subluxations (0.4%), 10 wound complications (1.0%), 2 intraoperative complications (0.2%), 14 tibial tubercle fractures (1.3%), 19 proximal tibia fractures (1.8%), 4 cases of anterior knee pain (0.4%), 4 cases of neuropraxia (0.4%), and 5 infections (0.5%). Of note, 219 knees (21%) required reoperation, but 170 (16.3%) of these were for painful hardware removal. Sixteen knees (1.5%) required revision TTO, 1 (0.1%) required subsequent high tibial osteotomy, 2 (0.2%) underwent patellofemoral arthroplasty for advanced arthritic changes, and 5 (0.5%) underwent total knee arthroplasty for advanced arthritic changes.

Studies With TTO Performed in Isolation

Twelve studies reported outcomes of isolated TTO procedures. In the 638 patients who underwent isolated TTO, the pathologies addressed were instability/laxity (429 patients, 67%), patellofemoral osteoarthritis (74, 12%), patella alta with instability (61, 10%), patellofemoral osteoarthritis with instability (31, 5%), patella baja (24, 4%), and patella alta (19, 3%). Pain was a preoperative issue in 289 (45%) of these patients and instability in 472 (74%).

Only 2.8% of patients experienced postoperative patellar dislocation events. Of the 12 studies, 2 reported VAS scores (34-point weighted mean improvement, 65 points before surgery to 31 after surgery), 3 reported Lysholm scores (30-point improvement, from 60 to 90), and 2 reported Kujala scores (21-point improvement, from 46 to 67).

Complication rates for this isolated-TTO pooled cohort of patients were 1.2% for revision TTOs, 0.5% for wound complications, 0.8% for tibial tubercle fractures, and 1.9% for proximal tibia fractures. In total, 16% of patients required hardware removal after surgery.

Discussion

This study found that TTO improved patient pain and clinical outcome scores despite having a high (16%) rate of reoperation for painful hardware in patients with preoperative pain or instability, or with patellofemoral osteoarthritis or aberrant patellar anatomy. This reoperation rate and the overall complication rate both exceeded our hypothesized 10% cumulative rate. However, <1% of patients required conversion to a definitive end-stage surgery (patellofemoral arthroplasty or total knee arthroplasty) by final follow-up, and the rates of comorbidities (anterior knee pain, wound infection, recurrent patellar subluxation/dislocation, tibial fracture) were relatively low.

Patellofemoral disorders are common in the general population and a frequent primary complaint on presentation to orthopedic offices. Having a thorough understanding of knee joint biomechanics is imperative when trying to determine whether surgery is appropriate for these complaints and how to proceed. Extensor mechanism abnormalities, including high lateral force vectors (or larger TT-TG distances) and excessive patellar tilt, can affect alignment and increase the risk for patellofemoral dislocations, patellofemoral anterior- based knee pains, and chondral lesions. Patella alta, an elevated patella, risks increased contact stresses between the patella and the trochlear groove ³³ and decreases the osseous constraints that inhibit dislocation of the patella with physiologic flexion of the joint. ³⁴ With TTO, the change in tuberosity position can alter angles in the extensor mechanism and thereby decrease joint reaction forces and patellofemoral contact area forces. ^35,36

Although its use began as an option for combating patellar instability events in patients with predisposed patellofemoral kinematics, ⁵ TTO has evolved in its therapeutic uses to include offloading patellar and trochlear focal chondral lesions and slowing progression of patellofemoral arthritis. Multiple iterations and modifications of the procedure have involved distal and medial transfer of the tibial tuberosity, medialization alone, concurrent anterior and medial elevation of the tuberosity, and proximal or distal transfers, depending on the pathology being corrected. Although TTO is highly versatile in treating multiple patellofemoral joint pathologies, this study found that its primary indication continues to be patellar instability, with anteromedialization as the most common direction of tubercle transfer in support of the medial structures providing the medial force vector that keeps the patella in place. These medial structures include the medial patellofemoral ligament, the vastus medialis obliquus, the medial patellotibial ligament, and the medial retinaculum.

Also notable was the relatively high rate of reoperation after TTO. However, >75% of reoperations were performed to remove painful hardware, and the need for reoperation seemed to have no effect on the statistically significant overall preoperative-to-postoperative improvement in VAS, Lysholm, and Kujala scores. Rates of definitive surgery for end-stage patellofemoral changes, including patellofemoral arthroplasty and total knee arthroplasty, were quite low at the weighted mean follow-up of several years after surgery, suggesting a role for TTO in avoiding arthroplasty. Although the infection rate was <1%, the rate of tibial tubercle or proximal tibia fractures was a cumulative 3.1%. Patients should be counseled on this complication risk, as treatment can require cast immobilization and weight-bearing limitations. ²⁴

The 69% proportion of women in the overall cohort and the mean (SD) age of 27.68 (10.45) years highlight the primary patient population that undergoes TTO. Compared with men, young women are more likely to have aberrant patellofemoral biomechanics, owing to their native anatomy, including their relatively larger Q-angle and TT-TG distance and thus increased lateral translational force vectors on the patella. ³⁷ In addition, more than half of patients who are having TTO underwent previous surgery on the affected knee—an indication that TTO is still not universally considered first-line in addressing patellofemoral pathology.

Limitations of the Analysis

The limitations of this analysis derive from the limitations of the included studies, which were mostly retrospective case series with relatively short follow-up. The low MCMS (<55) of all 21 studies highlights their low quality as well. These studies showed considerable heterogeneity in their reporting of specific preoperative, intraoperative, and postoperative radiographic, physical examination, and clinical outcome scores, which may be indicative of the relatively low rate of use of TTO, a procedure originally described decades ago. These studies also showed ample heterogeneity in the specific radiographic parameters or outcome scales they used to present their data. We were therefore limited in our ability to cohesively summarize and provide cumulative data points from the patients as a unified cohort. There was substantial variety in the procedures performed, surgical techniques used, concomitant pathologies addressed at time of surgery, and diagnoses treated—indicating a performance bias. This additionally precluded any significant meta-analysis within the patient cohort. A higher quality study, a randomized controlled trial, is needed to answer more definitively and completely the questions we left unanswered, including the effect on radiographic parameters, additional clinical outcomes, and patient satisfaction.

Conclusion

TTO is most commonly performed for isolated patellar instability in the presence of knee pain. Other pathologies addressed are patellofemoral osteoarthritis, and patella alta and patella baja with and without associated knee pain. TTO significantly improves knee pain and clinical outcome scores, though 21% of patients (>1 in 5) require reoperation for hardware removal. Young women with prior surgery on the affected knee are the primary patient population.