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Heterotopic ossification after total knee arthroplasty. 54/615 cases after 1-6 years' follow-up
Insights
Heterotopic ossification after total knee arthroplasty occurred in 9% of cases, primarily in the anterior distal femur. Prophylaxis is suggested for patients with severe arthrosis or periosteal damage.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Radiology
Background:
- Heterotopic ossification (HO) is the abnormal formation of bone in non-skeletal tissues.
- HO can occur after total knee arthroplasty (TKA), potentially impacting joint function.
- Understanding the incidence, location, and risk factors for HO post-TKA is crucial for patient management.
Purpose of the Study:
- To investigate the incidence and characteristics of heterotopic ossification following TKA.
- To identify correlations between HO development and patient conditions like arthrosis and rheumatoid arthritis.
- To propose a new classification system for anterior distal femoral HO and evaluate treatment outcomes.
Main Methods:
- Retrospective analysis of 615 patients who underwent TKA.
- Identification and grading of heterotopic ossifications based on location and size.
- Correlation analysis with pre-existing conditions (hypertrophic arthrosis, rheumatoid arthritis) and clinical outcomes.
Main Results:
- Heterotopic ossification was observed in 9% (54/615) of TKA cases.
- Largest ossifications were predominantly in the anterior distal femur; smaller ones occurred elsewhere.
- HO showed a positive correlation with hypertrophic arthrosis and a negative correlation with rheumatoid arthritis. Grade III HO in the anterior distal femur was symptomatic in 4 patients, with 2 successfully treated surgically.
Conclusions:
- Heterotopic ossification is a notable complication after TKA, particularly affecting the anterior distal femur.
- Hypertrophic arthrosis and periosteal damage are potential risk factors warranting consideration for prophylactic measures.
- A new 3-grade classification for anterior distal femoral HO is proposed, aiding in clinical assessment and management.
Abstract:
We found heterotopic ossifications in 54 (9%) of 615 cases after total knee arthroplasty. The largest ossifications were located in the anterior distal femur. In 12 cases smaller ossifications were found in other knee regions. The development of heterotopic ossification showed a positive correlation with hypertrophic arthrosis and a negative correlation with rheumatoid arthritis. We propose a new 3-grade classification which refers only to the anterior distal femoral region. Grade III heterotopic ossifications occurred in 4 patients (4 knees) who had clinical symptoms; 2 were successfully reoperated with removal of the ossifications. Prophylaxis should be considered in patients with marked hypertrophic arthrosis or marked periosteal damage to the anterior distal femur.