Arthroscopy

(Redirected from Arthroscopes)

Arthroscopy (also called arthroscopic or keyhole surgery) is a minimally invasive surgical procedure on a joint in which an examination and sometimes treatment of damage is performed using an arthroscope, an endoscope that is inserted into the joint through a small incision. Arthroscopic procedures can be performed during ACL reconstruction.

Arthroscopy
Lateral meniscus located between thigh bone (femur, above) and shin bone (tibia, below). The tibial cartilage displays a fissure (tip of teaser instrument).
ICD-9-CM80.2
MeSHD001182
OPS-301 code1-697
MedlinePlus007471

The advantage over traditional open surgery is that the joint does not have to be opened up fully. For knee arthroscopy only two small incisions are made, one for the arthroscope and one for the surgical instruments to be used in the knee cavity. This reduces recovery time and may increase the rate of success due to less trauma to the connective tissue. It has gained popularity due to evidence of faster recovery times with less scarring, because of the smaller incisions.[1] Irrigation fluid (most commonly 'normal' saline) is used to distend the joint and make a surgical space.

The surgical instruments are smaller than traditional instruments. Surgeons view the joint area on a video monitor, and can diagnose and repair torn joint tissue, such as ligaments. It is technically possible to do an arthroscopic examination of almost every joint, but is most commonly used for the knee, shoulder, elbow, wrist, ankle, foot, and hip.

Types

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Knee

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Knee arthroscopy, or arthroscopic knee surgery, is a surgery that uses arthroscopic techniques.

It has, in many cases, replaced the classic open surgery (arthrotomy) that was performed in the past. Arthroscopic knee surgery is one of the most common orthopaedic procedures, performed approximately 2 million times worldwide each year.[2] The procedures are more commonly performed to treat meniscus injury and to perform anterior cruciate ligament reconstruction.[3]

While knee arthroscopy is commonly used for partial meniscectomy (trimming a torn meniscus) on middle aged to older adults with knee pain, the claimed positive results seem to lack scientific evidence.[4] Many studies have shown the outcomes from knee arthroscopic surgery for osteoarthritis and degenerative meniscal tears are no better than the outcomes from placebo (fake) surgery or other treatments (such as exercise therapy).[5][6][7][8][9][10]

During an average knee arthroscopy, a small fiberoptic camera (the arthroscope) is inserted into the joint through a small incision, about 4 mm (1/8 inch) width. More incisions might be performed in order to visually check other parts of the knee and to insert the miniature instruments that are used to perform surgical procedures.

Knee osteoarthritis

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The BMJ Rapid Recommendations group makes a strong recommendation against arthroscopy for osteoarthritis on the basis that there is high quality evidence that there is no lasting benefit and less than 15% of people have a small short-term benefit.[11] There are rare but serious adverse effects that can occur, including venous thromboembolism, infections, and nerve damage.[11][12] The BMJ Rapid Recommendation includes infographics and shared decision-making tools to facilitate a conversation between doctors and patients about the risks and benefits of arthroscopic surgery.[11]

Two major trials of arthroscopic surgery for osteoarthritis of the knee found no benefit for these surgeries.[13][14] Even though randomized control trials have demonstrated this to be a procedure which involves the risks of surgery with questionable or no demonstrable long-term benefit, insurance companies (government and private) world-wide have generally felt obliged to continue funding it. An exception is Germany, where funding has been removed for the indication of knee osteoarthritis. It is claimed that German surgeons have continued to perform knee arthroscopy and instead claim rebates on the basis of a sub-diagnosis, such as meniscal tear.[15]

A 2017 meta-analysis confirmed that there is only a very small and usually unimportant reduction in pain and improvement in function at 3 months (e.g. an average pain reduction of approximately 5 on a scale from 0 to 100).[12] A separate review found that most people would consider a reduction in pain of approximately 12 on the same 0 to 100 scale important—suggesting that for most people, the pain reduction at 3 months is not important.[16] Arthroscopy did not reduce pain or improve function or quality of life at one year.[12] There are important adverse effects.[12]

Meniscal tears

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One of the primary reasons for performing arthroscopies is to repair or trim a painful and torn or damaged meniscus.[17] The technical terms for the surgery is arthroscopic partial meniscectomy (APM). Arthroscopic surgery, however, does not appear to result in benefits to adults when performed for knee pain in patients with osteoarthritis who have a meniscal tear.[18][12][19] This may be due to the fact that a torn meniscus may often not cause pain and symptoms, which may be caused by the osteoarthritis alone.[20] Some groups have made a strong recommendation against arthroscopic partial meniscectomy in nearly all patients, stating that the only group of patients who may—or may not—benefit are those with a true locked knee.[2] Professional knee societies, however, highlight other symptoms and related factors they believe are important, and continue to support limited use of arthroscopic partial meniscectomy in carefully selected patients.[21][22]

Hip arthroscopy was initially used for the diagnosis of unexplained hip pain, but is now widely used in the treatment of conditions both in and outside the hip joint. The most common indication currently is for the treatment of femoroacetabular impingement (FAI) and its associated pathologies. Hip conditions that may be treated arthroscopically also includes labral tears, loose / foreign body removal, hip washout (for infection) or biopsy, chondral (cartilage) lesions, osteochondritis dissecans, ligamentum teres injuries (and reconstruction), Iliopsoas tendinopathy (or 'snapping psoas'), trochanteric pain syndrome, snapping iliotibial band, osteoarthritis (controversial), sciatic nerve compression (piriformis syndrome), ischiofemoral impingement and direct assessment of hip replacement.

Hip arthroscopy is a widely adopted treatment for a range of conditions, including labral tears, femoroacetabular impingement, osteochondritis dissecans.[23]

Shoulder

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Arthroscopy is commonly used for treatment of diseases of the shoulder including subacromial impingement, acromioclavicular osteoarthritis, rotator cuff tears, frozen shoulder (adhesive capsulitis), chronic tendonitis, removal of loose bodies and partial tears of the long biceps tendon, SLAP lesions and shoulder instability. The most common indications include subacromial decompression, bankarts lesion repair and rotator cuff repair. All these procedures were done by opening the joint through big incisions before the advent of arthroscopy. Arthroscopic shoulder surgeries have gained momentum in the past decade. "Keyhole surgery" of the shoulder as it is popularly known has reduced inpatient time and rehabilitation requirements and is often a daycare procedure.

Wrist

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Arthroscopic view showing two of the wrist bones

Arthroscopy of the wrist is used to investigate and treat symptoms of repetitive strain injury, fractures of the wrist and torn or damaged ligaments. It can also be used to ascertain joint damage caused by wrist osteoarthritis.

Spine

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Many invasive spine procedures involve the removal of bone, muscle, and ligaments to access and treat problematic areas. In some cases, thoracic (mid-spine) conditions require a surgeon to access the problem area through the rib cage, dramatically lengthening recovery time.

Arthroscopic procedures (also endoscopic spinal procedures) allow access to and treatment of spinal conditions with minimal damage to surrounding tissues. Recovery times are greatly reduced due to the relatively small size of incisions, and many patients are treated as outpatients.[24] Recovery rates and times vary according to condition severity and the patient's overall health.

Arthroscopic procedures treat

Temporomandibular joint

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Arthroscopy of the temporomandibular joint is sometimes used as either a diagnostic procedure for symptoms and signs related to these joints, or as a therapeutic measure in conditions like temporomandibular joint dysfunction. TMJ arthroscopy can be a purely diagnostic procedure,[25] or it can have its own beneficial effects which may result from washing out of the joint during the procedure, thought to remove debris and inflammatory mediators, and may enable a displaced disc to return to its correct position. Arthroscopy is also used to visualize the inside of the joint during certain surgical procedures involving the articular disc or the articular surfaces, similar to laparoscopy.[26] Examples include release of adhesions (e.g., by blunt dissection or with a laser) or release of the disc. Biopsies or disc reduction can also be carried out during arthroscopy.[25] It is carried out under general anesthetic.[27]

History

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Professor Kenji Takagi in Tokyo has traditionally been credited with performing the first arthroscopic examination of a knee joint, in 1919. He used a 7.3 mm cystoscope for his first arthroscopies. The Danish physician Severin Nordentoft reported on arthroscopies of the knee joint in 1912 at the Proceedings of the 41st Congress of the German Society of Surgeons at Berlin.[28] He called the procedure (in Latin) arthroscopia genu, and used sterile saline or boric acid solution as his optic media, and entering the joint by a portal on the outer border of the patella. It is not clear if these examinations were of deceased or of living patients.[28]

Pioneering work began as early as the 1920s with the work of Eugen Bircher. He published several papers in the 1920s about his use of arthroscopy of the knee for diagnostic purposes.[29] After diagnosing torn tissue, he used open surgery to remove or repair the damaged tissue. Initially, he used an electric Jacobaeus thoracolaparoscope for his diagnostic procedures, which produced a dim view of the joint. Later, he developed a double-contrast approach to improve visibility.[30] He gave up endoscopy in 1930, and his work was largely neglected for several decades.

While he is often considered the inventor of arthroscopy of the knee,[31] the Japanese surgeon Masaki Watanabe, MD, receives primary credit for using arthroscopy for interventional surgery.[32][33] Watanabe was inspired by the work and teaching of Dr Richard O'Connor. Later, Dr. Heshmat Shahriaree began experimenting with ways to excise fragments of menisci.[34]

The first operating arthroscope was designed by them, and they worked together to produce the first high-quality color intraarticular photography.[35] The field benefited significantly from technological advances, particularly advances in flexible fiber optics during the 1970s and 1980s.

Canadian doctor Robert Jackson is credited with bringing the procedure to the Western world.[36] In 1964, Jackson was in Tokyo completing a one-year fellowship and serving as a physician for the Canadian Olympic team. While there, he spent time at the clinic of Watanabe learning the thirty year old procedure that had only been used to investigate arthritis in the elderly. Jackson returned to Toronto where he continued to practice the technique, eventually becoming "the world's foremost expert on arthroscopy".[37]

According to Sports Illustrated, "Jackson's particular genius was to recognize a wider application for the procedure than Watanabe ever did."[38] Jackson realized the technique could be used for young, athletic patients that had suffered injuries. Torn knee cartilage or ligaments previously would require an arthrotomy procedure and might mean a year or more of rehab or the end of a career. Jackson believed the less invasive procedure with its smaller incisions would be able to save the career of injured athletes.[39] While many were skeptical at first, Jackson's efforts to develop, teach and popularize the procedure helped to prolong the careers of athletes such as Bobby Orr, Willis Reed, Joan Benoit and Mary Lou Retton. For this, Jackson was named one of Sports Illustrated's forty most impactful people in sport's history, coming in at #37, and the only doctor on the list.[38]

Complications

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Arthroscopy is considered a low-risk procedure with a very low rates of serious complications.[40][41][42] Commonly, irrigation fluid may leak (extravasates) into the surrounding soft tissue, causing edema which is generally a temporary phenomenon, taking anywhere from 7–15 days to completely settle. Rarely, this fluid may be the cause of a serious complication, compartment syndrome.[43] However, postarthroscopic glenohumeral chondrolysis (PAGCL) is a rare complication of arthroscopic surgery and involves chondrolysis wherein the articular cartilage of the shoulder undergoes rapid, degenerative changes shortly after arthroscopic surgery.[44]

See also

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Notes

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  1. ^ Millar, Neal L.; Wu, Xiao; Tantau, Robyn; Silverstone, Elizabeth; Murrell, George A. C. (2009-04-01). "Open versus Two Forms of Arthroscopic Rotator Cuff Repair". Clinical Orthopaedics and Related Research. 467 (4): 966–978. doi:10.1007/s11999-009-0706-0. ISSN 0009-921X. PMC 2650068. PMID 19184264.
  2. ^ a b Siemieniuk RA, Harris IA, Agoritsas T, Poolman RW, Brignardello-Petersen R, Van de Velde S, Buchbinder R, Englund M, Lytvyn L, Quinlan C, Helsingen L, Knutsen G, Olsen NR, Macdonald H, Hailey L, Wilson HM, Lydiatt A, Kristiansen A, et al. (May 2017). "Arthroscopic surgery for degenerative knee arthritis and meniscal tears: a clinical practice guideline". BMJ. 357: j1982. doi:10.1136/bmj.j1982. PMC 5426368. PMID 28490431.
  3. ^ Jameson, S. S.; Dowen, D.; James, P.; Serrano-Pedraza, I.; Serrano-Pedraza, Deehan; Reed, M. R.; Deehan, D. J. (October 2011). "The burden of arthroscopy of the knee: a contemporary analysis of data from the English NHS". The Journal of Bone and Joint Surgery. British Volume. 93 (10): 1327–1333. doi:10.1302/0301-620X.93B10.27078. ISSN 2044-5377. PMID 21969430.
  4. ^ Järvinen, Teppo L N; Guyatt, Gordon H (20 July 2016). "Arthroscopic surgery for knee pain". BMJ. 354: i3934. doi:10.1136/bmj.i3934. PMID 27439983. S2CID 34496491.
  5. ^ Kise NJ, Risberg MA, Stensrud S, Ranstam J, Engebretsen L, Roos EW, et al. (20 July 2016). "Exercise therapy versus arthroscopic partial meniscectomy for degenerative meniscal tear in middle aged patients: randomised controlled trial with two year follow-up". BMJ. 354: i3740. doi:10.1136/bmj.i3740. PMC 4957588. PMID 27440192.
  6. ^ Yim JH, Seon JK, Song EK, Choi JI, Kim MC, Lee KB, Seo HY, et al. (23 May 2013). "A comparative study of meniscectomy and nonoperative treatment for degenerative horizontal tears of the medial meniscus". The American Journal of Sports Medicine. 41 (7): 1565–1570. doi:10.1177/0363546513488518. PMID 23703915. S2CID 9886312.
  7. ^ Moseley JB, O'Malley K, Petersen NJ, Menke TJ, Brody BA, Kuykendall DH, Hollingsworth JC, Ashton CM, Wray NP, et al. (July 11, 2002). "A Controlled Trial of Arthroscopic Surgery for Osteoarthritis of the Knee". The New England Journal of Medicine. 347 (2): 81–88. doi:10.1056/NEJMoa013259. PMID 12110735.
  8. ^ Merchan EC, Galindo E, et al. (1993). "Arthroscope-guided surgery versus nonoperative treatment for limited degenerative osteoarthritis of the femorotibial joint in patients over 50 years of age: a prospective comparative study". Arthroscopy. 9 (6): 663–667. doi:10.1016/s0749-8063(05)80503-1. PMID 8305102.
  9. ^ Kirkley A, Birmingham TB, Litchfield RB, Giffin JR, Willits KR, Wong CJ, Feagan BG, Donner A, Griffin SH, D'Ascanio LM, Pope JE, Fowler PJ, et al. (September 11, 2008). "A Randomized Trial of Arthroscopic Surgery for Osteoarthritis of the Knee". The New England Journal of Medicine. 359 (11): 1097–1107. doi:10.1056/NEJMoa0708333. PMID 18784099.
  10. ^ Chang RW, Falconer J, Stulberg SD, Arnold WJ, Manheim LM, Dyer AR, et al. (March 1993). "A randomized, controlled trial of arthroscopic surgery versus closed-needle joint lavage for patients with osteoarthritis of the knee". Arthritis & Rheumatism. 36 (3): 289–96. doi:10.1002/art.1780360302. PMID 8452573.
  11. ^ a b c Siemieniuk RA, Harris IA, Agoritsas T, Poolman RW, Brignardello-Petersen R, Van de Velde S, Buchbinder R, Englund M, Lytvyn L, Quinlan C, Helsingen L, Knutsen G, Olsen NR, Macdonald H, Hailey L, Wilson HM, Lydiatt A, Kristiansen A, et al. (May 2017). "Arthroscopic surgery for degenerative knee arthritis and meniscal tears: a clinical practice guideline". BMJ. 357: j1982. doi:10.1136/bmj.j1982. PMC 5426368. PMID 28490431.
  12. ^ a b c d e Brignardello-Petersen R, Guyatt GH, Buchbinder R, Poolman RW, Schandelmaier S, Chang Y, Sadeghirad B, Evaniew N, Vandvik PO, et al. (May 2017). "Knee arthroscopy versus conservative management in patients with degenerative knee disease: a systematic review". BMJ Open. 7 (5): e016114. doi:10.1136/bmjopen-2017-016114. PMC 5541494. PMID 28495819.
  13. ^ Kirkley, Alexandra; Birmingham, Trevor B.; Litchfield, Robert B.; Giffin, J. Robert; Willits, Kevin R.; Wong, Cindy J.; Feagan, Brian G.; Donner, Allan; Griffin, Sharon H. (2008-09-11). "A Randomized Trial of Arthroscopic Surgery for Osteoarthritis of the Knee". New England Journal of Medicine. 359 (11): 1097–1107. doi:10.1056/nejmoa0708333. ISSN 0028-4793. PMID 18784099. S2CID 205089497.
  14. ^ Moseley JB, O'Malley K, Petersen NJ, et al. (July 2002). "A controlled trial of arthroscopic surgery for osteoarthritis of the knee". N. Engl. J. Med. 347 (2): 81–8. doi:10.1056/NEJMoa013259. PMID 12110735.
  15. ^ Fujita-Rohwerder, Naomi; Rüther, Alric; Sauerland, Stefan (2017). "Arthroscopic Surgery for Knee Osteoarthritis: Impact of Health Technology Assessment in Germany". International Journal of Technology Assessment in Health Care. 33 (4): 420–423. doi:10.1017/S0266462317000861. PMID 29043949. S2CID 22929482.
  16. ^ Devji T, Guyatt GH, Lytvyn L, Brignardello-Petersen R, Foroutan F, Sadeghirad B, Buchbinder R, Poolman RW, Harris IA, Carrasco-Labra A, Siemieniuk RA, Vandvik PO, et al. (May 2017). "Application of minimal important differences in degenerative knee disease outcomes: a systematic review and case study to inform BMJ Rapid Recommendations". BMJ Open. 7 (5): e015587. doi:10.1136/bmjopen-2016-015587. PMC 5777462. PMID 28495818.
  17. ^ Orthoinfo
  18. ^ Thorlund, J. B.; Juhl, C. B.; Roos, E. M.; Lohmander, L. S. (2015-06-16). "Arthroscopic surgery for degenerative knee: systematic review and meta-analysis of benefits and harms". BMJ. 350: h2747. doi:10.1136/bmj.h2747. ISSN 1756-1833. PMC 4469973. PMID 26080045.
  19. ^ Khan, M; Evaniew, N; Bedi, A; Ayeni, OR; Bhandari, M (7 October 2014). "Arthroscopic surgery for degenerative tears of the meniscus: a systematic review and meta-analysis". CMAJ: Canadian Medical Association Journal. 186 (14): 1057–64. doi:10.1503/cmaj.140433. PMC 4188648. PMID 25157057.
  20. ^ Englund M, Guermazi A, Gale D, et al. (September 2008). "Incidental meniscal findings on knee MRI in middle-aged and elderly persons". N. Engl. J. Med. 359 (11): 1108–15. doi:10.1056/NEJMoa0800777. PMC 2897006. PMID 18784100.
  21. ^ Stone, Jonathan A.; Salzler, Matthew J.; Parker, David A.; Becker, Roland; Harner, Christopher D. (2017-04-21). "Degenerative meniscus tears - assimilation of evidence and consensus statements across three continents: state of the art". Journal of ISAKOS: Joint Disorders & Orthopaedic Sports Medicine. 2 (2): 108–119. doi:10.1136/jisakos-2015-000003. S2CID 56936743.
  22. ^ Beaufils, Ph; Becker, R.; Kopf, S.; Englund, M.; Verdonk, R.; Ollivier, M.; Seil, R. (2017-02-01). "Surgical management of degenerative meniscus lesions: the 2016 ESSKA meniscus consensus". Knee Surgery, Sports Traumatology, Arthroscopy. 25 (2): 335–346. doi:10.1007/s00167-016-4407-4. ISSN 0942-2056. PMC 5331096. PMID 28210788.
  23. ^ "Hip Arthroscopy Surgery in Sydney — From Dr. Sunny Randhawa (June 2015)". Archived from the original on 2015-03-10. Retrieved 2008-01-14.
  24. ^ "Minimally Invasive Endoscopic Spinal Surgery". June 20, 2005. Cleveland Clinic contribution to SpineUniverse.com
  25. ^ a b Wray D, Stenhouse D, Lee D, Clark AJ (2003). Textbook of general and oral surgery. Edinburgh [etc.]: Churchill Livingstone. pp. 173–178. ISBN 978-0443070839.
  26. ^ Kalantzis A, Scully C (2005). Oxford handbook of dental patient care, the essential guide to hospital dentistry (2nd ed.). New York: Oxford University Press. pp. 116, 117. ISBN 9780198566236.
  27. ^ Kerawala C, Newlands C, eds. (2010). Oral and maxillofacial surgery. Oxford: Oxford University Press. pp. 342–351. ISBN 9780199204830.
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  29. ^ Craig H. Bennett; Caroline Chebli (2004). Knee Arthroscopy (PDF). BUSINESS BRIEFING: GLOBAL HEALTHCARE – ADVANCED MEDICAL TECHNOLOGIES (Report). Archived from the original (PDF) on 2007-09-30.
  30. ^ Kieser CW, Jackson RW (2003). "Eugen Bircher (1882–1956) the first knee surgeon to use diagnostic arthroscopy". Arthroscopy. 19 (7): 771–6. doi:10.1016/S0749-8063(03)00693-5. PMID 12966386.
  31. ^ Böni T (1996). "[Knee problems from a medical history viewpoint]". Ther Umsch (in German). 53 (10): 716–23. PMID 8966679.
  32. ^ Watanabe M (1983). "History arthroscopic surgery". In Shahriaree H (ed.). O'Connor's Textbook of Arthroscopic surgery (1st ed.). Philadelphia: J.B. Lippincott.
  33. ^ Jackson RW (1987). "Memories of the early days of arthroscopy: 1965–1975. The formative years". Arthroscopy. 3 (1): 1–3. doi:10.1016/S0749-8063(87)80002-6. PMID 3551979.
  34. ^ Metcalf RW (1985). "A decade of arthroscopic surgery: AANA. Presidential address". Arthroscopy. 1 (4): 221–5. doi:10.1016/S0749-8063(85)80087-6. PMID 3913437.
  35. ^ Allen FR, Shahriaree H (1982). "Richard L. O'Connor, M.D., 1933–1980". J Bone Joint Surg Am. 64 (2): 315. doi:10.2106/00004623-198264020-00036. Archived from the original (PDF) on 2008-11-22. Retrieved 2010-11-27.
  36. ^ "Robert Jackson was Canadian pioneer in arthroscopic surgery". Retrieved 2020-01-27.
  37. ^ Today, Orthopedics; February 2010. "Physician who brought arthroscopy to North America passes away at 78". www.healio.com. Retrieved 2020-01-27.{{cite web}}: CS1 maint: numeric names: authors list (link)
  38. ^ a b Hoffer, Richard. "37 DR. ROBERT JACKSON". Vault. Retrieved 2020-01-27.
  39. ^ Selby, Ronald (2010). "In Memoriam: Robert Wilson Jackson, O.C., M.D., F.R.C.S.C., Hon. F.R.C.S. (UK & Edin)". Arthroscopy Journal. 26 (3): 294–297. doi:10.1016/j.arthro.2010.01.011. PMID 20206033.
  40. ^ Friberger Pajalic, Katarina; Turkiewicz, Aleksandra; Englund, Martin (1 June 2018). "Update on the risks of complications after knee arthroscopy". BMC Musculoskeletal Disorders. 19 (1): 179. doi:10.1186/s12891-018-2102-y. PMC 5984803. PMID 29859074.
  41. ^ Abram, Simon G F; Judge, Andrew; Beard, David J; Price, Andrew J (September 2018). "Adverse outcomes after arthroscopic partial meniscectomy: a study of 700000 procedures in the national Hospital Episode Statistics database for England". The Lancet. 392 (10160): 2194–2202. doi:10.1016/S0140-6736(18)31771-9. PMC 6238020. PMID 30262336.
  42. ^ Hame, Sharon L.; Nguyen, Virginia; Ellerman, Jessica; Ngo, Stephanie S.; Wang, Jeffrey C.; Gamradt, Seth C. (2012-04-10). "Complications of Arthroscopic Meniscectomy in the Older Population". The American Journal of Sports Medicine. 40 (6): 1402–1405. doi:10.1177/0363546512443043. PMID 22495145. S2CID 25464984.
  43. ^ Siegel, M. G. (July 1997). "Compartment syndrome after arthroscopic surgery of the knee. A report of two cases managed nonoperatively". The American Journal of Sports Medicine. 25 (4): 589–590. doi:10.1177/036354659702500432. ISSN 0363-5465. PMID 9241000. S2CID 209327350.
  44. ^ Yeh, PC; Kharrazi, FD (February 2012). "Postarthroscopic glenohumeral chondrolysis". The Journal of the American Academy of Orthopaedic Surgeons. 20 (2): 102–12. doi:10.5435/JAAOS-20-02-102. PMID 22302448. S2CID 11304366.
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