The Outcomes of Nonoperative Management of Patients With Hip and Knee Osteoarthritis Triaged to a Physiotherapy-Led Clinic at Minimum 5-Year Follow-Up and Factors Associated With Progression to Surgery

Mar 1, 2020The Journal of arthroplasty

Long-term results of physical therapy care for hip and knee osteoarthritis and factors linked to later surgery

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Abstract

At mean 6-year follow-up, 56% of patients had undergone or were awaiting total joint arthroplasty.

74% of patients with hip osteoarthritis required surgery compared to 41% of those with knee osteoarthritis.
The 7-year surgery-free survival rate was 23.7% for hip osteoarthritis and 55.9% for knee osteoarthritis.
Factors associated with a higher likelihood of surgery included having hip osteoarthritis, higher Kellgren-Lawrence grades, and worse Oxford Hip/Knee Scores.
Patients with mild-moderate knee osteoarthritis may not need surgery at 7 years.

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BACKGROUND: The purpose of this study is to determine outcomes of a nonoperative treatment service for hip and knee osteoarthritis (OA), the "Joint Clinic," at minimum 5-year follow-up, and investigate factors that may influence progression to joint replacement surgery.

METHODS: This is an observational cohort study of 337 patients with hip (n = 151, 45%) or knee OA (n = 186, 55%) seen at the Joint Clinic, at 5-7 years of follow-up. Kaplan-Meier survival curves were used to determine survivorship of the affected joint and Cox regression used to determine factors associated with time to surgery.

RESULTS: At mean 6-year follow up, 188 (56%) patients had undergone or were awaiting total joint arthroplasty, 127 (38%) were still being managed nonoperatively, and 22 (7%) had died without having surgery. Patients with hip OA were more likely to have required surgery (111/151, 74%) than patients with knee OA (77/186, 41%) (chi-square = 33.6, P < .001). The 7-year surgery-free survival for hip OA was 23.7% and knee OA 55.9% (P < .001). Factors associated with increased likelihood of surgery were joint affected (hip, hazard ratio [HR] 2.80), Kellgren-Lawrence (KL) grade (KL 3, HR 2.02; KL 4, 4.79), and Oxford Hip/Knee Score (HR 1.34 for each 5 points worse at baseline).

CONCLUSION: More than 50% of the patients referred to secondary care with mild-moderate knee OA may not need surgery at 7 years. Patients with hip OA and those with severe radiographic changes are more likely to require surgery and should not be delayed if there is not an adequate response to conservative measures.

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The Outcomes of Nonoperative Management of Patients With Hip and Knee Osteoarthritis Triaged to a Physiotherapy-Led Clinic at Minimum 5-Year Follow-Up and Factors Associated With Progression to Surgery

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